Absorbent core for an absorbent article

专利摘要:
An absorbent core for an absorbent article is provided with an absorbent material, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone comprising at least partially delimited from the other second zones by the one or more first zones, characterized in that the first amount of bulk absorbent material is different from the second amount of absorbent material, each amount of absorbent material being determined as a weight per unit area.
公开号:BE1025054B1
申请号:E2017/0131
申请日:2017-09-27
公开日:2018-10-15
发明作者:Karen Roets；Evan Descheemaecker；Danny Zwanckaert
申请人:Ontex Bvba；Ontex Group Nv；
IPC主号:

专利说明:

(30) Priority data:
14/03/2017 EP 17160763 (73) Holder (s):
ONTEX BVBA
9255, BUGGEN WOOD
Belgium
ONTEX GROUP NV 9320, EREMBODEGEM Belgium (72) Inventor (s):
ROETS Karen
9900 EEKLO
Belgium
DESCHEEMAECKER Evan 9900 EEKLO
Belgium
SWANTS Danny
9990 MALDEGEM
Belgium (54) Absorbent core for an absorbent article (57) An absorbent core for an absorbent article is provided with an absorbent material, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone at least partially delimited from the other second zones by the one or more first zones characterized in that the first amount of bulk absorbent material is different from the second amount of absorbent material, each amount absorbent material is determined as weight per unit area.
Fig. 1
BELGIAN INVENTION PATENT
FPS Economy, K.M.O., Self-employed& Energy Publication number: 1025054Filing number: BE2017 / 0131 Intellectual Property Office International Classification: A61F 13/15 A61F 13/532 A61F 13/534 Date of Issue: 15/10/2018
The Minister of Economy,
Having regard to the Paris Convention of 20 March 1883 for the Protection of Industrial Property;
Having regard to the Law of March 28, 1984 on inventive patents, Article 22, for patent applications filed before September 22, 2014;
Having regard to Title 1 Invention Patents of Book XI of the Economic Law Code, Article XI.24, for patent applications filed from September 22, 2014;
Having regard to the Royal Decree of 2 December 1986 on the filing, granting and maintenance of inventive patents, Article 28;
Having regard to the application for an invention patent received by the Intellectual Property Office on 27/09/2017.
Whereas for patent applications that fall within the scope of Title 1, Book XI, of the Code of Economic Law (hereinafter WER), in accordance with Article XI.19, § 4, second paragraph, of the WER, the granted patent will be limited. to the patent claims for which the novelty search report was prepared, when the patent application is the subject of a novelty search report indicating a lack of unity of invention as referred to in paragraph 1, and when the applicant does not limit his filing and does not file a divisional application in accordance with the search report.
Decision:
Article 1
ONTEX BVBA, Genthof 5, 9255 BUGGENHOUT Belgium;
ONTEX GROUP NV, Korte Keppestraat 21, 9320 EREMBODEGEM Belgium;
represented by
LARANGE Françoise, Korte Keppestraat 21, 9320, AALST-EREMBODEGEM;
a Belgian invention patent with a term of 20 years, subject to payment of the annual taxes as referred to in Article XI.48, § 1 of the Economic Law Code, for: Absorbent core for an absorbent article.
INVENTOR (S):
ROETS Karen, Korte Moeie 53, 9900, EEKLO;
DESCHEEMAECKER Evan, Korte Moeie 53, 9900, EEKLO;
ZWANCKAERT Danny, Torredreef 2B, 9990, MALDEGEM;
PRIORITY :
03/14/2017 EP 17160763;
BREAKDOWN:
Split from basic application:
Filing date of the basic application:
Article 2. - This patent is granted without prior investigation into the patentability of the invention, without warranty of the merit of the invention, nor of the accuracy of its description and at the risk of the applicant (s).
Brussels, 15/10/2018,
With special authorization:
¹ BE2017 / 0131
Absorbent core for an absorbent article
Description:
The invention relates to an absorbent core for an absorbent article, in particular for hygienic articles, for formulating absorbent particles.
One element that contributes to the performance of an absorbent article is the way in which the absorbent article resists deformation when used. An individual's thighs exert lateral forces on an absorbent article when the absorbent article is placed between an individual's legs for use. The side forces result in bundling of the absorbent article, which affects the efficiency of the absorbent ability of the absorbent article to collect body fluids, since there is a reduction in the surface area of the absorbent article in direct contact with the body. There have been many developments that have sought to improve the ability of the absorbent article to conform to the human body, i.e., to have an improved physical fit.
EP 1077052 A1 and EP 1078617 A2 disclose a sanitary napkin that allows controlled deformation in response to lateral compression during use. The sanitary napkin has preferential bending zones that extend along a longitudinal axis formed by a process of perforating, cutting, cutting or embossing.
EP 1959903 B1 describes an incontinence pad comprising a pair of folding lines that divide the absorbent core material into a central portion
BE2017 / 0131 and a pair of longitudinal side sections to better adapt to the user's body. The fold lines are formed by compression of the absorbent material.
EP 2211808 B1 describes an absorbent core comprising an upper absorbent core and a lower absorbent core. The upper absorbent core includes folding indicia that allow the absorbent core to assume a predetermined three-dimensional shape when subjected to widthwise pressure. The folding indicia are cuts or compression lines that may or may not extend completely through the top core.
EP 1349524 B1 discloses a pantiliner that includes at least one folding line defining a central region and two side regions that allow to adjust the pantiliner size by folding the pantiliner over the folding line. The fold lines are relief lines.
EP 1267775 B1 discloses a sanitary napkin that meets the body limitations. The sanitary napkin includes a forward wide portion and a rear narrow portion and at least two fold lines preformed on the top or bottom surface of the narrow portion. The folding lines can be selected from mechanically compressed lines, chemically bonded components forming the lines, heat generated lines, laser generated lines, glue generated lines and / or lines generated by mechanical vibration.
EP 10 885 36 A2 discloses a hygienic sanitary napkin provided with ridges, which makes it possible to adapt the hygienic sanitary napkin to the panties of the user.
US 5,756,039 A discloses an absorbent core comprising separate segments that can be independently moved by a lifting member. The lifting member ensures that the topsheet conforms to the body of the wearer.
BE2017 / 0131
US 2006/0184150 A1 discloses an absorbent core with varying flexibility that serves as a shaping element for improved body fit. The absorbent core may have lines of reduced bending resistance formed by material removal, e.g. in the form of openings or slots.
US 6,503,233 B1 discloses an absorbent article comprising a combination of downwardly deflecting fold lines and an upwardly deflectable molding line to obtain a geometry for improved body fit. The relief lines are formed by compression of the absorbent material. The shape line is formed by perforation or notching.
However, there remains a need to further improve the body fit of absorbent articles to improve comfort for the individual using the absorbent article.
Another element that contributes to the performance of an absorbent article is the ability to distribute a liquid, which must be absorbed by the absorbent core, through the absorbent core as quickly as possible to avoid, or at least prevent, a sense of reduce wet feeling for the individual using the absorbent article.
There remains a need to further improve the distribution of the liquid throughout the absorbent core.
The object of the invention is to provide an absorbent core for an absorbent article with improved physical fit and / or improved liquid distribution.
The article is obtained with the absorbent core according to claim 1.
In one embodiment, an absorbent article absorbent core comprising an absorbent material is provided, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount
BE2017 / 0131 absorbent material, wherein the second zone is at least partially delimited from the other second zones by the one or more first zones, the first amount of absorbent material being different from the second amount of absorbent material, each amount of absorbent material being determined as weight per unit area.
In one embodiment, the ratio of the second amount of absorbent material within a second zone to the first amount of absorbent material within adjacent one or more first zones in the absorbent core is between 0 and 1, preferably between 0.05 and 0.80, with more preferably between 0.10 to 0.70, even more preferably 0.15 to 0.60, most preferably 0.20 to 0.50.
In another embodiment, the ratio of the second amount of absorbent material within a second zone to the first amount of absorbent material within adjacent one or more first zones in the absorbent core is greater than 1, preferably greater than 2, more preferably greater than 3 more preferably 4 to 20, even more preferably 5 to 19, most preferably 6 to 18.
When the absorbent article comprising the absorbent core is in use, the one or more zones with a lesser amount of absorbent material than the one or more zones with a higher amount of absorbent material allow the absorbent article to fold the absorbent core into a clearly defined path in response to a sideways applied compressive force and / or allowing improved liquid distribution in the absorbent core.
In one embodiment, the one or more second zones in the absorbent core comprising a second amount of absorbent material have a second density of absorbent material that is less than a first density of absorbent material of the one or more first zones containing a first amount of absorbent material. material. Preferably, the absorbent core preferably has a substantially constant thickness. Preferably
BE2017 / 0131 the ratio of the second density of absorbent material to the first density of absorbent material is 0.95 or less, preferably 0.90 or less, more preferably 0.80 or less, even more preferably 0.70 or lower, most preferably 0.60 or lower.
In another embodiment, the one or more second zones in the absorbent core comprising a second amount of absorbent material have a second density of absorbent material that is higher than a first density of absorbent material of the one or more first zones containing a first amount of absorbent material. absorbent material. Preferably, the absorbent core preferably has a substantially constant thickness. Preferably, the ratio of the first density of absorbent material to the second density of absorbent material is 0.95 or less, preferably 0.90 or less, more preferably 0.80 or less, even more preferably 0.70 or lower, most preferably 0.60 or lower.
The one or more second zones can form channels, fold lines or combinations thereof. The one or more second zones comprising a second amount of absorbent material are preferably in the form of one or more continuous or discontinuous lines. The one or more first zones can form what we also refer to herein as the bulk absorbent material.
In one embodiment, an absorbent article absorbent core comprising an absorbent material is provided, the absorbent core comprising bulk absorbent material having a bulk density and one or more zones or lines of absorbent material having a density lower than the bulk density of the bulk absorbent material.
When the absorbent article comprising the absorbent core is in use, the one or more zones or lines of absorbent material have a lower density than the one or more zones or lines of absorbent material of a higher density, for example the bulk density of the bulk absorbent material, allows the folding of the absorbent article including the absorbent core in a defined manner in response to a
BE2017 / 0131 compression force applied laterally and / or allows improved liquid distribution in the absorbent core.
Preferably, the absorbent core comprising the one or more first zones comprising a first amount of absorbent material and the one or more second zones comprising a second amount of absorbent material is a substantially monolithic structure.
The one or more zones or lines of absorbent material having a density less than the bulk density of the bulk absorbent material allow to increase the rate of liquid distribution through the absorbent core.
When in use, lateral compressive forces are applied by an individual's thighs to an absorbent article positioned between the individual's legs and the one or more zones or lines of lower density absorbent material will have reduced stiffness and will fold more easily than the bulk absorbent material with higher bulk density. Thus, the one or more zones or lines of absorbent material having a density less than the bulk density of the bulk absorbent material, for example, contained in the one or more first zones, will function as fold lines when the lines are correctly positioned in the absorbent material core. The folding lines of absorbent material in the lower density absorbent core allow an absorbent article comprising the absorbent core to fold in a well-defined manner to ensure an improved fit of the body resulting in improved efficiency of the absorbent article of the body to collect body fluids and to prevent leakage of the absorbent article.
The one or more zones or lines of absorbent material having a density less than the bulk density of the bulk absorbent material allow the distribution of fluid to be rapidly absorbed by the absorbent core, since the flow resistance for the liquid is lower in the
BE2017 / 0131 lines of absorbent material with a lower density compared to the flow resistance in the absorbent material in the mass. The zones or lines of lower density absorbent material could be considered to form channels for liquid distribution in the absorbent core. Prior art fold lines in absorbent cores formed by compression of the absorbent material will have a higher density than the bulk density of the absorbent material in bulk resulting in a higher flow resistance in the fold lines of absorbent material that will reduce the distribution of the absorbent material. liquid in the absorbent core.
Prior art folding lines in absorbent cores formed by removal of absorbent material from the bulk absorbent material have the same density as the bulk absorbent material and therefore will not improve the distribution of liquid in the absorbent core since the flow resistance will be the same in the fold lines and in the absorbent material in the mass. Furthermore, the cross-sectional area of the fold lines available for the flow of the liquid is actually reduced by removing absorbent material from the bulk absorbent material thereby reducing the capacity of the fold lines of absorbent material to distribute liquid in the absorbent core to inhibit of the distribution of the liquid in the absorbent core.
The term absorbent article refers to devices that absorb and contain liquid and more particularly refers to devices placed against or in proximity to an individual's body to absorb and contain the various exudates discharged from the individual's body. Absorbent articles include, but are not limited to, diapers, adult incontinence pants, training pants, diaper holders and liners, sanitary napkins and the like, as well as surgical dressings and sponges. Absorbent articles preferably include a longitudinal axis and a transverse axis perpendicular to said longitudinal axis. The longitudinal axis is conventionally chosen in the direction from front to back of the
BE2017 / 0131 absorbent article when referring to the absorbent article to be worn, and the transverse axis is conventionally selected in the left to right direction of the absorbent article when referring to the absorbent article.
Disposable absorbent articles may include a liquid-permeable topsheet, a backsheet bonded to the topsheet and an absorbent core positioned and held between the topsheet and the backsheet. The topsheet is operatively permeable to the liquids intended to be absorbed or contained (stored) by the absorbent article, and the backsheet may or may not be substantially impermeable or otherwise operatively impermeable to the intended liquids. The absorbent article may also include other components such as liquid transporting layers, liquid inlet layers, liquid distribution layers, transfer layers, barrier layers, coating layers and the like, as well as combinations thereof. Disposable absorbent articles and their components can act to provide a body-facing surface and a garment-facing surface.
An absorbent article suitable for feminine external personal care is preferably designed to be attached to an inner surface of a person's underwear by e.g. a clothing glue and is designed to absorb fluids that are excreted from the body, for example blood, menstruation and urine. The absorbent article is an elongated product with a central longitudinal axis x-x, a central transverse axis y-y and a vertical axis z-z. The absorbent article, for example a feminine care pad or fabric, may comprise a liquid-permeable topsheet or cover, a baffle or backsheet, which is preferably liquid-impervious, and an absorbent core positioned and sandwiched between the liquid-permeable top and the backsheet or bulkhead. Optionally, the absorbent article may comprise one or more separate layers that are in addition to the backsheet and are sandwiched between the backsheet and the absorbent core.
BE2017 / 0131
The baffle or backsheet are used herein as synonyms and are preferably liquid impermeable and preferably designed to allow the passage of air or vapor from the absorbent article while blocking the passage of body fluid. A liquid impervious baffle can be made from any material with these properties. The liquid impervious backsheet can also be constructed of a material that will block the passage of vapor as well as liquid, if desired. A suitable material from which the backing layer can be made is a micro-embossed polymeric film, preferably a film comprising or consisting of a polyolefin, such as a polyethylene or a polypropylene. Bicomponent films can also be used as a backsheet.
Preferably the backsheet is a film consisting essentially of a polyethylene, ie composed of at least 50% by weight of a polyethylene, preferably at least 75% by weight, more preferably at least 90% by weight, with even more preferred for at least 95% by weight.
The liquid-permeable topsheet can be bonded or bonded to the backsheet by any known method that does not leave any hard or uncomfortable residue that would irritate the individual using the absorbent article. Those skilled in the art are familiar with methods of bonding the various materials and for bonding other materials included in the absorbent article of the present invention, including, but not limited to, the use of pressure sensitive adhesives, hot melt adhesives, two-sided adhesive sheets, ultrasonic welding and hot sealing.
Adhesives such as hot melt adhesives can be applied uniformly or in the form of a continuous or non-continuous layer.
Preferably, the liquid pervious topsheet and backsheet will each comprise a generally dog bone or hourglass configuration, with the ends of the dog bone or hourglass shape oriented toward the central longitudinal axis. An absorbent article with a dog bone or hourglass shape
BE2017 / 0131 is more comfortable to wear than a generally rectangular shaped product. The absorbent article can also be asymmetrical with respect to the central transverse axis.
The term adhesive as used herein includes any suitable hot melt, water based adhesive or solvent based adhesive which can be applied to a surface of a film layer in a desired pattern or network of adhesive areas to form a nonwoven film, laminate. Accordingly, suitable adhesives include conventional hot melt adhesives, pressure sensitive adhesives and reactive adhesives, such as, for example, a polyurethane adhesive.
As used herein, the term adhesive bond means a bonding process that forms a bond by application of an adhesive. Such an adhesive application can be by various methods such as crevice coating, spray coating and the like. Furthermore, such an adhesive can be applied to a product component and then exposed to pressure so that contact of a second product component with the adhesive-containing product component forms an adhesive bond between the two components.
The absorbent medium or absorbent core or absorbent body in the absorbent article is preferably arranged between a liquid-permeable topsheet and a backsheet in at least the crotch region of the absorbent article and is capable of absorbing liquid and retaining body exudates. The absorbent core can be manufactured in a wide variety of shapes (for example, rectangular, trapezoidal, T-shaped, L-shaped, hourglass shape, dog bone shape, etc.) and may comprise a wide variety of absorbent materials. Examples of absorbent materials include fluff pulp, preferably cellulosic fluff pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent nonwoven materials and the like, or any
BE2017 / 0131 combination of two or more of these absorbent materials.
For example, fluff pulp can be combined with superabsorbent polymers in an absorbent material.
The absorbent core can comprise one or more layers of absorbent material stacked on top of each other.
It is also possible for the absorbent article to include an acquisition and distribution layer. Acquisition and distribution layer, ADL or peak control portion refers to a layer, which is preferably a nonwoven absorbent layer, preferably placed under the liquid-permeable top layer of an absorbent article, which further accelerates transportation and improves liquid distribution throughout the absorbent core . The acquisition and distribution layer is typically less hydrophilic than the absorbent core and has the ability to rapidly collect and temporarily retain liquid bursts, and to transport the liquid from the initial entry point to other parts of the absorbent structure, particularly to other parts of the absorbent core. The acquisition and distribution layer can prevent or at least reduce the liquid and collect on the portion of the absorbent article positioned against the skin of the individual, thereby reducing the feeling of wetness by the individual. Preferably, the recording and distribution layer is positioned between the liquid-permeable topsheet and the absorbent core.
The term associated includes configurations in which the liquid-permeable top sheet is directly connected to the backsheet by attaching the top sheet directly to the backsheet, and configurations in which the liquid-permeable top sheet is connected to the backsheet by applying the top sheet to intermediate elements which are their turn are attached to the backsheet. The liquid-permeable top sheet and the back sheet
BE2017 / 0131 can be directly attached to each other by fasteners such as adhesive, doorsonic bonds, thermal bonds or any other suitable fasteners known in the art. For example, a uniform continuous layer of adhesive, a patterned adhesive layer, a sprayed adhesive pattern, or a series of discrete lines, swirls, or spots of construction adhesive can be used to affix top layer to backsheet. It should be readily understood that the fasteners described above can also be used to join and join various other materials included in the absorbent article.
The absorbent core is preferably formed by deposition material which forms the absorbent core in a mold cavity or deposition cavity thereby forming a formed absorbent material deposition structure. The material forming the absorbent core can comprise any absorbent material or any combination of two or more absorbent materials. Suitable absorbent materials include fluff pulp, preferably cellulosic fluff pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent nonwoven materials and the like, or any combination of two or more of these absorbent materials.
The molded absorbent material deposition structure preferably has a coherence that allows handling of the molded absorbent material deposition structure, such as, for example, removal of the molded absorbent material deposition structure from the deposition cavity without the molded absorbent material deposition structure losing integrity, whereby the absorbent material formed causes the material sales structure is falling apart. Sufficient consistency for handling the formed absorbent material deposition structure can be obtained by any suitable means, for example, by entanglement of fibers included in the formed absorbent material deposition structure, by chemical bonds formed between components of the absorbent material or materials, such as, for example,
BE2017 / 0131 provided by VanderWaals forces or by hydrogen bonds, by thermal bonds between components of the absorbent material or the absorbent materials which can be obtained, for example, by heating the absorbent material or absorbent materials in the deposition cavity.
The mold cavity or deposition cavity preferably has an air-permeable, porous or perforated bottom surface that allows vacuum to be applied to the absorbent materials in the mold cavity, allowing the formed deposition structure of the absorbent material to be maintained in the deposition cavity.
Depending on the strength of the vacuum applied by the porous bottom surface of the mold cavity, an initial compaction of the molded absorbent material deposition structure can be achieved and / or improved cohesion in the molded absorbent material deposition structure can be obtained, thereby improving handling of the molded structure , absorbent material outlet structure.
The mold cavity or deposition cavity may be on any suitable surface, but is preferably located on the periphery of a drum, as described, for example, in US 5,756,039 A. The shape of the outer walls of the deposition cavity defines the outer shape of the resulting molded deposition structure. of the absorbent material and of the resulting absorbent core.
Preferably, the absorbent core preferably has a substantially constant thickness. By the term substantially constant thickness is meant that the maximum thickness of the absorbent core is at most 1.5 times, preferably at most 1.25 times, more preferably at most 1.1 times, even more preferably at most 1 0.05 times the minimum thickness of the absorbent core as determined by the test method described herein.
The absorbent core according to the invention comprises one or more zones or lines of absorbent material with a density lower than the bulk density
BE2017 / 0131 of the bulk absorbent material. Preferably, the ratio of the density of the absorbent material lines to the bulk density of the bulk absorbent material in the absorbent core is less than 1, preferably 0.05 to 0.80, more preferably 0.10 to 0, 70, even more preferably 0.15 to 0.60, most preferably 0.20 to 0.50.
Preferably, the density of the absorbent material lines has a density lower than the density of the one or more first zones or absorbent material lines, e.g. The bulk density of the absorbent material in bulk is 300 kg / m3 or less, preferably 250 kg / m3 or less, more preferably 200 kg / m3 or less, most preferably 160 kg / m3 or less. Reducing the density of the lines improves the distribution speed of liquid through the absorbent core.
In one embodiment, the width of the one or more second zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material is in the range of 1 to 6 mm, preferably in the range of 2 to 5 mm, more preferably in the range of 3 to 4 mm, to provide adequate liquid distribution in the absorbent core and / or to improve the folding of the absorbent core in response to applied lateral compressive forces.
The one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material may or may not extend through the entire thickness of the absorbent core. When the zones or lines of lower density absorbent material do not extend over the entire thickness of the absorbent core, the risk of fluid leakage through the backsheet of an absorbent article is reduced. Zones or lines of lower density absorbent material that do not extend through the entire thickness of the absorbent core can be obtained by stacking layers of different absorbent material / materials in the deposition cavity.
BE2017 / 0131
When the zones or lines of lower density absorbent material extend through the entire thickness of the absorbent core, the maximum absorption of liquid in the absorbent core is promoted. Preferably, the one or more zones or lines of absorbent material have a density less than the density of the one or more first zones or lines of absorbent material, e.g. The bulk density of the absorbent material for the mass extends to at least 10% of the thickness of the absorbent core, preferably to at least 15%, more preferably to at least 20%, more preferably to at least 25% , even more preferably from 30% to 80%, of the thickness of the absorbent core.
The absorbent core according to the invention is preferably a monolithic structure, i.e. a single element of material, which is not composed of separate segments which can be handled independently and which must be combined into a composite absorbent core, as described, for example, by US 5,756,039 A. The absorbent core according to the invention does not have to be built together from separate elements, thereby improving production efficiency and reducing costs.
The absorbent core according to the invention comprising one or more zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the absorbent material in bulk permits folding of the absorbent core, subject to lateral compressive forces and / or allows for improved liquid distribution. Improvement of the liquid distribution in the absorbent core can be determined as a reduction in the time to acquire the Courtray according to the test method described herein. In one embodiment, the absorbent core has a Courtray acquisition time of less than 850 seconds, preferably less than 750 seconds, more preferably less than 600 seconds, even more preferably less than 550 seconds.
BE2017 / 0131
The deposition of absorbent material / materials in the mold cavity or deposition cavity can be carried out by any suitable process. Preferably, the deposition of absorbent material / materials in the mold cavity is performed by an air-layered process, as is well known in the art as disclosed, for example, in US 5,756,039 A.
The absorbent core according to the invention may comprise one or more suitable absorbent materials, for example fluff pulp, preferably cellulose fluff, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent non-woven materials and the like, or any combination of two or more of these absorbent materials.
In one embodiment, the absorbent core may be composed of a single absorbent material, preferably selected from fluff pulp, preferably cellulose fiber pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent nonwoven materials, e.g. improve production efficiency.
In another embodiment, the absorbent core may comprise at least two different absorbent materials, each absorbent material being individually preferably selected from fluff pulp, preferably cellulosic fluff pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP); absorbent foam materials, absorbent non-woven materials. The at least two different absorbent materials can be mixed homogeneously or can be applied in two or more separate layers.
In one embodiment, the absorbent material in the absorbent core may comprise a first layer of absorbent material comprising fluff pulp, a second layer of absorbent material comprising superabsorbent polymer or a homogeneous mixture of superabsorbent polymer and fluff pulp, and a third layer of absorbent material comprising fluffy pulp to better
BE2017 / 0131 to provide distribution of the liquids to the superabsorbent polymer which in turn then absorbs and stores the distributed liquid. In addition, this arrangement ensures further protection of the underlay and less chance of holes / perforations due to sharper edges of the SAP. Further advantages are a better liquid distribution in the first down layer, a better core load and a faster intake time (acquisition time).
In a preferred embodiment, the superabsorbent polymer comprises a content of at least 5 wt%, preferably at least 10 wt%, more preferably more than 20 wt% of the absorbent material. Preferably, the weight ratio (based on the weight of the absorbent material) of the superabsorbent polymer and the fluff pulp is less than 20:80, preferably less than 15:85, more preferably from 1:99 to 14:86.
The absorbent core of the invention includes zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. The bulk density of the bulk absorbent material. The positioning of the zones or lines of lower density absorbent material in the absorbent core can be varied to provide channels for liquid distribution in the absorbent core.
The lower density zones or lines of absorbent material that provide channels for liquid distribution in the absorbent core can be positioned in any direction in the absorbent core to optimize liquid distribution through the absorbent core.
In one embodiment, the absorbent core comprises one or more second zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material, which extends substantially parallel to the central longitudinal axis of the absorbent core to improve fluid distribution in a direction substantially parallel to the central longitudinal axis. The term essentially parallel to the
BE2017 / 0131 central longitudinal axis extending means that the zone or line of lower density absorbent material and the central axis has a cross angle which is an acute angle, preferably an acute angle of 30 ° or less, preferably 20 ° or less , more preferably 15 ° or less, even more preferably 10 ° or less. Two lines crossing each other will create four corners, generally two equally sharp corners and two equally obtuse angles. The acute angle of intersection is determined at the intersection of the line of lower density absorbent material and the central longitudinal axis in the event that there is indeed an actual intersection; in the case that the line of lower density absorbent material and the central axis does not intersect in the absorbent core, or one or both of the line of lower density absorbent material and the central longitudinal axis are extensively imaginary until the lines meet would cut. For the sake of clarity, it is emphasized that the one or more second zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material are not necessarily at a cross point.
In one embodiment, the absorbent core comprises one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material, which extends / is exactly parallel to the central longitudinal axis.
The one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the absorbent material in the absorbent core, which extends substantially or exactly parallel to the central longitudinal axis, can also act as fold lines when the absorbent core is subjected to lateral compressive forces when in use to adjust the fit of the absorbent core. improve body.
BE2017 / 0131
In one embodiment, the absorbent core comprises one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material extending substantially parallel to the central transverse axis to improve fluid distribution in a direction substantially parallel to the central transverse axis. The term extending substantially parallel to the central transverse axis means that the line of lower density absorbent material and the central axis has a cutting angle which is an acute angle, preferably an acute angle of 30 ° or less, preferably 20 ° or less, more preferably 15 ° or less, even more preferably 10 ° or less.
In one embodiment, the absorbent core comprises one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material, which extends exactly parallel to the central transverse axis.
The one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the absorbent material in the absorbent core, extending substantially or exactly parallel to the central transverse axis, can also act as fold lines to collapse the absorbent article comprising the absorbent core into a smaller shape so that the absorbent article can fit for example, easier in a wallet.
The one or more second zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material may form a pattern symmetrical to a central longitudinal axis of the absorbent core and preferably at least two second zones extending along and in
BE2017 / 0131 substantially parallel to the central longitudinal axis on opposite and distal sides thereof.
The absorbent core comprising one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material, extending substantially or exactly parallel to the central longitudinal axis and / or one or more lines of absorbent material having a density lower than the bulk density of the bulk absorbent material substantially or exactly in parallel to the central transverse axis may include additional zones or lines of absorbent material having a density lower than the bulk density of the bulk absorbent material to join the one or more zones or lines of absorbent material that are substantially or exactly parallel to the center longitudinal axis and / or the one or more zones or lines of absorbent material extending substantially or exactly parallel to the central transverse axis to form a network of connected lines of absorbent material of lower density to optimize liquid distribution in the absorbent core and / or to make fold lines in the absorbent core and for a better fit of the body.
In one embodiment, the absorbent core may comprise one or more second zones or lines of absorbent material having a second density lower than the first density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material and one or more zones or lines of absorbent material having a third density that is less than the first density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material, wherein the one or more second zones or lines of absorbent material have a second density lower than the density of the one or more third zones or lines of absorbent material of a third density. The one or more zones or lines of absorbent material having a second density lower than the third density and lower than the first
BE2017 / 0131 density of the first zones or lines, e.g. the bulk density of the absorbent material for the bulk, will fold most easily when applying lateral forces, e.g. positioned through an individual's thighs on an absorbent article between the legs of the individual, thereby ensuring fit of the body of the absorbent article comprising the absorbent core. The one or more lines of absorbent material having a third density higher than the second density and lower than the first density, e.g. will provide the bulk density of the bulk absorbent material, fluid distribution channel (s), but will not (yet) fold. Upon reaching a certain threshold level of the applied lateral compressive forces, the one or more zones or lines of third density absorbent material may act as additional fold lines to provide an improved body with increasing compression forces.
Preferably, the absorbent core includes two end portions and a central portion therebetween extending parallel to the central longitudinal axis of the absorbent core, and at least two second zones or lines converge to one point proximal of at least one, preferably both, said end portions such that in particular one or two v-shaped ends are formed for an improved body fit. Alternatively, at least two second zones or lines run parallel along said central portion and further converge to one point proximal to at least one, preferably both, of the end portions such that one or two v-shaped ends are formed for improved fit of the body, preferably wherein the at least two second zones or lines are joined together by one or more further second zones or lines and / or one or more third zones or lines comprising a third amount of absorbent material, the third amount absorbent material is different from the first amount of absorbent material and second amount of absorbent material, the one or more further second zones or lines and / or one or more third zones or lines extending along the
BE2017 / 0131 central transverse axis, more preferably wherein the one or more further second zones or lines and / or one or more third zones or lines are arranged to form a cross-shaped connection on the central part of the absorbent core.
Obviously, the absorbent core may also comprise fourth zones, fifth zones, sixth zones or even more zones or lines of absorbent material, each with different amounts of absorbent material, preferably each with different densities, to optimize the fit of the body ; or the liquid distribution in the absorbent article including the absorbent core.
Preferably, the ratio of the second density of the one or more zones or lines of absorbent material of a second density to the first density of the one or more zones or lines of absorbent material of a first density is 0.95 or less, at preferably 0.90 or less, more preferably 0.80 or less, even more preferably 0.70 or less, most preferably 0.60 or less.
In one embodiment, at least one zone or line of absorbent material has a density less than the density of the one or more first zones or lines of absorbent material, e.g. The bulk density of the absorbent material in the absorbent core is positioned such that, when in use, the line of lower density absorbent material is located at the point where the individual's body secretes a liquid to be absorbed, such that the liquid can quickly distributed by the absorbent core. Preferably, at least one of the zones or lines of absorbent material has a density less than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the absorbent material in the absorbent core is positioned at the intersection of the central longitudinal axis and the central transverse axis of the absorbent article, since the absorbent core is preferably designed such that the point where the body of the individual excretions
BE2017 / 0131 liquid to be absorbed coincides with the intersection of the central longitudinal axis and the central transverse axis of the absorbent article for optimal distribution and absorption of the fluid.
In one embodiment, at least two second zones or lines of absorbent material with a density lower than the first density of the one or more first zones or lines of absorbent material, eg the bulk density of the absorbent material in the absorbent core, such are positioned that, when in use, the second zones or lines of absorbent material meet, preferably intersect, near, preferably at, a point of the central portion of the absorbent core, preferably the point where the body of the absorbent material individual secretes a fluid to be absorbed such that the fluid can be quickly distributed by the absorbent core in a symmetrical pattern. For clarity, the crossing angle between these at least two second zones or lines of absorbent material can be 90 ^° or different. Preferably at least two second zones or lines of absorbent material have a density lower than the first density of the one or more first zones or lines of absorbent material, eg the bulk density of the absorbent material in the absorbent core, are positioned that, in use, the second zones or lines of absorbent material meet, preferably intersect, near, preferably at, the intersection of the central longitudinal axis and the central transverse axis of the absorbent article, since the absorbent core is preferably such designed that the point where the individual's body secretes a fluid to be absorbed coincides with the intersection of the central longitudinal axis and the central transverse axis of the absorbent article for optimal distribution and absorption of the fluid. For the sake of clarity, it is emphasized that the one or more second zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material are not necessarily at a crossroads.
Preferably, the second zones or lines of absorbent material have a density lower than the density of the one or more first zones or lines
BE2017 / 0131 of absorbent material, e.g. the bulk density of the absorbent material in the mass, forming a pattern symmetrical to the central longitudinal axis of the absorbent core and / or symmetrical to the central transverse axis of the absorbent core for optimal distribution and absorption of the liquid in the absorbent core.
Another object of the invention is to provide a method of providing an absorbent core for an absorbent article in accordance with any of the above embodiments with improved body fit and / or improved fluid distribution.
The object is achieved by the method of providing an absorbent core for an absorbent article according to Claim 12.
In one embodiment, a method of providing an absorbent core for an absorbent article is provided, the process comprising the steps of:
i. providing a mold cavity comprising a shaping profile part, the mold cavity preferably having an air-permeable base surface, ii. inserting one or more absorbent materials into the mold cavity comprising the forming profile member to form a formed absorbent material deposition structure, iii. removing the molded absorbent material deposition structure from the mold cavity to form an absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone at least partially bounded by said one or more first zones, said second zones having the inverted shape of the shaping profile portion and said first and second amounts of absorbent material, each measured as a weight per unit area, being different.
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In an embodiment, step i. of the process includes the step of inserting the molding profile portion into the mold cavity.
In one embodiment, the air-permeable base surface in liquid communication (preferably air communication) with a negative pressure source is arranged to provide a vacuum force.
The process preferably includes the step of applying a first air-permeable material layer, preferably a nonwoven web, into the mold cavity comprising the forming profile portion prior to the process step of introducing the one or more absorbent materials into the mold cavity.
Preferably, the method comprises the step of directly or indirectly applying a second material layer, preferably a nonwoven web, over the one or more absorbent materials after the process step of introducing one or more absorbent materials into the mold cavity.
The absorbent material introduced into the mold cavity can be adhered to the first air-permeable material layer and / or the second material layer, for example by lamination or any other suitable bonding technique discussed above.
Preferably, the method comprises the step of applying a bonding step for forming a laminate comprising the first air-permeable material layer, the second material layer and the one or more absorbent materials therebetween.
Preferably, the process includes ii. a pressure difference, preferably a vacuum force, is applied over the air-permeable base surface of the mold cavity to displace the one or more absorbent materials relative to the molding profile member and to form one or more first zones containing a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material.
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In one embodiment, the molding profile part of the method is a three-dimensional structure, preferably formed by a 3D printing process, and preferably the molding profile part is not in fluid communication with the pressure difference, preferably a vacuum force, applied over the air-permeable base surface of the mold cavity .
In one embodiment, the molding profile part of the method is a three-dimensional structure, preferably formed by a 3D printing process, and preferably the molding profile part is not in fluid communication with the pressure difference, preferably a vacuum force, applied over the air-permeable base surface of the mold cavity.
The shaping profile part is preferably arranged in the mold cavity such that a second pressure difference, preferably a second vacuum force, is provided which is less than, equal to or greater than the pressure difference which is provided on parts of the base surface distai from the molding section, or wherein the one or more recesses comprise a depth extending perpendicular to the plane formed by the ends and sides of the base and the depth is sized to displace absorbent material in the one or more recesses in which the second, the vacuum force is equal to the vacuum force imparted to parts of the base distai of the molding section.
Preferably, during the process, the one or more first zones and / or the one or more second zones comprising a second amount of absorbent material are formed in the absorbent core in the absence of direct mechanical action, such as compression of the second amount of absorbent material by embossing .
In one embodiment, a method of providing an absorbent core for an absorbent article is provided, wherein the absorbent core comprises a large absorbent material and one or more zones or lines of absorbent material having a density less than the density of the one or more first zones or lines of absorbent material, eg, the
BE2017 / 0131 bulk density of the absorbent material in the absorbent core for improved body fit and / or for improved liquid distribution, comprising the steps of inserting a molding profile member, preferably a three-dimensional structure, into a mold cavity, inserting one or more absorbent materials in the mold cavity comprising the forming profile portion, preferably a three-dimensional structure, for forming a molded absorbent material deposition structure, removing the molded absorbent material deposition structure from the mold cavity and compressing the molded absorbent material depositing structure to provide thickness and consolidating the cast absorbent material deposition structure into an absorbent core comprising zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g., the bulk density of the bulk abso raving material.
The process of providing an absorbent core comprises the step of depositing one or more absorbent materials in a mold cavity or deposition cavity to form a molded absorbent material deposition structure, wherein a forming profile member, preferably a three-dimensional structure, is inserted into the mold before placing the one or more absorbent materials in the mold cavity. Due to the presence of the shaping profile element, preferably a three-dimensional structure, in the deposition cavity, the deposition of the one or more absorbent materials is limited to the volume of the mold not occupied by the shaping profile member, preferably a three-dimensional structure, thereby reducing the total amount or weight of absorbent material over the thickness of the cast absorbent material deposition structure in places where the three-dimensional structure occupies a portion of the volume of the deposition cavity.
When in use, lateral compressive forces are exerted by a person's thighs on the absorbent article positioned between the individual's legs, the zones or lines of absorbent
BE2017 / 0131 material with a lower density has a reduced stiffness and folds more easily than the volume of absorbent material with a higher bulk density. Proper positioning of the lower density zones or lines in the absorbent core allows an absorbent article comprising the absorbent core to fold in a defined manner to provide an improved body fit resulting in improved efficiency of the absorbent article of the absorbent article to collect body fluids and to prevent leakage.
The zones or lines of absorbent material have a lower density than the first density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material allows the fluid to be absorbed to be quickly distributed since the flow resistance for the liquid is lower in the zones or lines of lower density than the flow resistance in the bulk absorbent material with a higher bulk density. Thus, the zones or lines of lower density absorbent material could be considered to form channels for liquid distribution in the absorbent core.
Fold lines in absorbent cores formed by compression of the absorbent material have a higher density than the bulk absorbent material, resulting in higher flow resistance in the fold lines that impede the distribution of liquid in the absorbent core.
The mold cavity or deposition cavity preferably has an air-permeable, porous or perforated bottom surface which allows to apply a pressure differential, preferably a vacuum, to the absorbent material or absorbent materials in the mold, allowing the deposition structure formed of the absorbent material is maintained in the deposition cavity.
Depending on the strength of the pressure difference, preferably a vacuum, which is applied through the porous bottom or the base surface of the
BE2017 / 0131 mold cavity, an initial compaction of the molded absorbent material deposit structure can be achieved and / or the coherence in the molded absorbent material deposit structure can be improved to improve handling of the molded deposit of the absorbent material.
The mold or deposit cavity may be on any suitable surface, but is preferably located on the periphery of a drum, as described, for example, in US 5,756,039 A. The shape of the outer walls of the deposition cavity defines the outer shape of the resulting molded deposition structure of the absorbent material and the resulting absorbent core.
Deposition of one or more absorbent materials in the mold cavity or deposition cavity in the process of providing an absorbent core with improved body fit and / or improved fluid distribution can be performed by any suitable method. Preferably, the deposition of one or more absorbent materials in the deposition cavity is performed by an air-layered process, as is well known in the art as disclosed, for example, in US 5,756,039 A.
The process step of depositing one or more absorbent materials in the mold cavity or deposition cavity may comprise a series of deposition process steps sequentially depositing multiple layers of absorbent material, each layer comprising one or more absorbent materials to obtain an absorbent core comprising multiple stacked layers of different absorbent material (s). Preferably, the one or more absorbent materials in each layer is selected from fluff pulp, preferably cellulose fluffy pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent nonwoven materials and the like, or a combination of two or more of these absorbent materials.
In one embodiment, the method comprises only a single deposition step for obtaining an absorbent core composed of a single layer
BE2017 / 0131 of absorbent material or materials which may be composed of a single absorbent material, preferably is chosen from down pulp, preferably cellulose fluff pulp fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent non-woven materials and the like, or any mixture of two or more of these absorbent materials.
In another embodiment, the method comprises two or more successive deposition steps for obtaining an absorbent core composed of two or more stacked layers of absorbent materials, each layer may be composed of a single absorbent material, preferably selected from fluff pulp, preferably cellulosic material fluff pulp, fabric layers, highly absorbent polymers (so-called superabsorbent polymer particles or SAP), absorbent foam materials, absorbent nonwoven materials and the like, or any mixture of two or more of these absorbent materials.
In one embodiment, the method comprises three successive deposition steps for obtaining an absorbent core composed of three stacked layers of absorbent materials, the first layer of absorbent material comprising fluff pulp, the second layer of absorbent material being a superabsorbent polymer or a homogeneous mixture of superabsorbent polymer and fluff pulp, and the third layer of absorbent material comprises fluff pulp.
The process includes the step of removing the formed absorbent material deposition structure from the mold cavity. Preferably, the molded absorbent material deposition structure has a coherence that allows handling of the molded deposition structure of the absorbent material, such as, for example, removal of the molded deposition structure of the absorbent material from the deposition cavity without the molded deposition structure of the absorbent material losing integrity, whereby the molded deposit of the absorbent material structure to fall apart. Sufficient coherence
BE2017 / 0131 for handling the cast deposition structure of the absorbent material can be obtained by any suitable means, for example, by entangling fibers included in the cast absorbent material deposition structure, by creating chemical bonds between components of the absorbent materials, such as, for example, by VanderWaal's forces or by hydrogen bonds between components of the absorbent materials, by forming thermal bonds between components of the absorbent materials which can be obtained, for example, by heating the absorbent materials in the deposition cavity.
After removing the cast deposit structure of the absorbent material from the mold, the deposited structure of the formed absorbent material shows a profiled surface.
The presence of the three-dimensional structure in the mold results in lines of indentations in the formed cast structure deposit structure. The presence of the three-dimensional structure in the mold results in lines of indentations in the formed cast structure deposition structure. These indentation lines can, in themselves, act as fold lines in the cast deposit of the absorbent material.
When the formed deposition structure of the absorbent material has sufficient coherence, the molded deposition structure of the absorbent material can be used as an absorbent core without further consolidation.
Preferably, the method further comprises the step of compressing the cast propellant deposition structure removed from the mold to reduce the thickness and to consolidate the formed absorbent material deposition structure into an absorbent core comprising lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g., the bulk density of the bulk absorbent material. Preferably, the absorbent core has an in
BE2017 / 0131 substantially constant thickness after compressing the formed absorbent material deposition structure into an absorbent core. By the term substantially constant thickness is meant that the maximum thickness of the absorbent core is at most 1.5 times, preferably at most 1.25 times, more preferably at most 1.10 times, even more preferably at most 1 0.05 times the minimum thickness of the absorbent core. The thickness is measured according to the test method described herein.
Compression of the molded absorbent material deposition structure removed from the mold can be performed by any suitable method that applies a compressive force to the entire surface of the molded absorbent material deposition structure or only at specific locations of the surface of the molded absorbent material deposition structure, thereby increasing the thickness of ( specific locations of) the formed deposition structure of the absorbent material is reduced and the formed deposition structure of the formed absorbent material is consolidated into an absorbent core comprising zones or lines of absorbent material having a density lower than the density of the one or more zones or lines of absorbent material first, e.g. the bulk density of the bulk absorbent material. The process step of compressing the cast absorbent material deposition structure may include heating the molded absorbent material deposition structure to improve compression of the molded absorbent material deposition structure. Heating the cast deposit structure of the absorbent material is especially useful when heat-fusible thermoplastic fibers are included in the cast deposit structure of the absorbent material.
The most commonly used method of compressing an absorbent core is embossing or stamping. Relief printing is usually achieved through a combination of die and anvil rolls.
The surface of the anvil roll can be hardened or it can be made of a flexible material such as a rubber. The absorbent core is forced
BE2017 / 0131 between a die roller and an anvil roller to compress the cast deposit structure of the absorbent material. Depending on the surface structure of the die roll and / or the anvil roll, the surface of the absorbent core may comprise a texture.
Compression of the formed deposition structure of the formed absorbent material, removed from the mold, is preferably performed until the one or more zones or lines of absorbent material have a density lower than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the absorbent material in bulk has a density such that the ratio of the density of the lines of absorbent material to the bulk density of the bulk absorbent material in the absorbent core is 0.95 or less, preferably 0.90, or less, more preferably 0.80 or less, even more preferably 0.70 or less, most preferably 0.60 or less.
Preferably, the compression of the molded absorbent material mold is performed until the density of the one or more zones or lines of absorbent material has a density less than the density of the one or more first zones or lines of absorbent material , e.g. the bulk density of the absorbent material in bulk is 300 kg / m3 or less, preferably 250 kg / m3 or less, more preferably 200 kg / m3 or less, most preferably 160 kg / m3 or less.
The forming profile member, preferably a three-dimensional structure, inserted into the mold cavity prior to deposition of one or more absorbent materials in mold, may be physically bonded to one or more exterior surfaces of the mold cavity that define the shape or contour of the absorbent core to ensure correct positioning of the three-dimensional structure and consequently correct positioning of the lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g., the bulk density of the absorbent material in the absorbent core.
BE2017 / 0131
However, the shaping profile part, preferably a three-dimensional structure, can also be placed in the mold without physically connecting the shaping profile part, preferably a three-dimensional structure, to one or more external surfaces of the mold. For example, the three-dimensional structure may be shaped such that the three-dimensional structure fits exactly within the depositing cavity, preferably in direct contact with one or more external surfaces of the mold cavity to ensure proper positioning of the three-dimensional structure, and consequently correct positioning of the zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g., the bulk density of the absorbent material in the absorbent core. Since there is no physical connection between the shaping profile part, preferably a three-dimensional structure, and the outer surfaces of the mold, the shaping profile part can be easily removed from the mold cavity and replaced with another shaping profile member or three-dimensional structure, e.g., for providing an absorbent core of various specifications.
In another embodiment, the forming profile member or three-dimensional structure is formed such that the three-dimensional structure fits loosely into the delivery cavity without physically connecting the three-dimensional structure to one or more exterior surfaces of the mold cavity and without contacting the exterior surfaces of the mold cavity. mold to provide absorbent material lines having a density lower than the density of the one or more first zones or absorbent material lines, e.g., the bulk density of the absorbent material in the absorbent core that does not extend to the outer contour of the absorbent core, reducing the risk of fluid leakage to the outer contour of the absorbent core. Correct positioning of the three-dimensional structure in the mold can be ensured, for example, by a sufficiently strong vacuum applied through a porous bottom surface of the depositing cavity or by an adhesive material.
BE2017 / 0131
The molding section or three-dimensional structure can be configured in any desired shape to provide zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g. the bulk density of the bulk absorbent material.
The molding section or three-dimensional structure can be formed by any suitable process. The three-dimensional structure can be, for example, a formed network. Preferably, the three-dimensional structure is formed by a 3D printing process, which is a versatile process to provide any desired shape of a three-dimensional structure.
The 3D printing process can even be used to 3D print the mold cavity comprising said molding profile member as a single part.
The three-dimensional structure can be formed from any suitable material, including metals such as steel, stainless steel, aluminum alloy, titanium alloy, stainless steel, nickel alloy, brass, bronze, copper, cobalt chrome, chromium carbide nickel, aluminide mixture, silver, gold, platinum and mixtures thereof ; plastics such as polyamide (PA), aluminum-filled polyamide (Alumide = PA12-MD (Al)), glass-filled polyamide (PA-GF), polycarbonate, thermoplastic polyurethane, acrylonitrile butadiene styrene (ABS) or polybutylene terephthalate (PBT) or polyamide, polypropylene (PP), acrylic plastics (such as poly (methyl methacrylate)), polylactic acid (PLA), polyethylene terephthalate (PET), polyphenyl sulfone (PPSF) / polyphenyl sulfone (PPSU), polyvinyl acetate (PVA), impact resistant polystyrene (HIPS), polyoxymethylene (POM) (or acetal), polyether ether (PEEK), polyether amide (PEBA), carbon fiber filled plastics, resins (such as NeXt, Xtreme, Ultem, Mammoth), and mixtures thereof; ceramics, porcelain, terracotta, gypsum (sandstone), stone and mixtures thereof; organic materials such as wood, paper and mixtures thereof; and mixtures thereof. Most preferred are steel, stainless steel, aluminum alloy, titanium alloy or alumide.
BE2017 / 0131
Preferably, the three-dimensional structure comprises or consists of a material capable of dissipating electric charge, such as, for example, alumide, i.e. a mixture of a polyamide and aluminum powder, to avoid negative effects of static charge build-up within the deposition cavity.
Alumide can be used advantageously in 3D printing processes. The alumide typically contains polyamide which includes aluminum particles preferably an average grain size of 40 to 80 µm, preferably 50 to 70 µm (according to ISO 13320-1) and typically a laser diffraction of 2 to 3 mil. Said particles can further have a shore D hardness of 60 to 90, preferably from 70 to 80 (according to ISO 868).
Alternatively, the three-dimensional structure includes or consists of a titanium alloy, e.g. Titanium Grade 5. Titanium Grade 5 can be advantageously incorporated into 3D printing processes
In one embodiment, the three-dimensional structure inserted into the delivery cavity includes one or more strands or ribs that extend essentially parallel to the central longitudinal axis of the delivery cavity to provide lines of lower density in the absorbent core that extend essentially parallel to the central longitudinal axis of the absorbent core to improve fluid distribution in a direction substantially parallel to the central longitudinal axis. The term extending substantially parallel to the central longitudinal axis means that the strand of the three-dimensional structure and the central axis have a cutting angle which is an acute angle, preferably an acute angle of 30 ° or less, preferably 20 ° or less, more preferably 15 ° or less, even more preferably 10 ° or less.
In one embodiment, the three-dimensional structure inserted into the delivery cavity includes one or more strands or ribs that extend exactly parallel to the central longitudinal axis of the delivery cavity.
BE2017 / 0131
In one embodiment, the three-dimensional structure inserted into the delivery cavity includes one or more strands or ribs that extend essentially parallel to the central transverse axis of the delivery cavity to provide lines of lower density in the absorbent core that extend essentially parallel to the central transverse axis of the absorbent core to improve fluid distribution in a direction substantially parallel to the central transverse axis. The term extending substantially parallel to the central transverse axis means that the line of lower density absorbent material and the central axis has a cutting angle which is an acute angle, preferably an acute angle of 30 ° or less, preferably 20 ° or less, more preferably 15 ° or less, even more preferably 10 ° or less.
In one embodiment, the three-dimensional structure inserted into the delivery cavity includes one or more strands or ribs that extend exactly parallel to the central transverse axis of the delivery cavity.
The three-dimensional structure inserted into the delivery cavity comprising one or more strands or ribs extending substantially or exactly parallel to the central longitudinal axis of the delivery cavity and / or one or more strands or ribs extending substantially or exactly parallel to the central transverse axis of the deposition cavity may include additional strands or ribs connecting the one or more strands or ribs extending substantially or exactly parallel to the central longitudinal axis of the deposition cavity and the one or more strands or ribs extending substantially or exactly parallel to the central transverse axis of the deposition cavity to provide a network of lines of lower density absorbent material to optimize fluid distribution in the absorbent core and / or to create fold lines in the absorbent core for improved body fit.
In one embodiment, the three-dimensional structure introduced into the mold may comprise one or more first strand (s) or ribs to form one or more lines of absorbent material having a first density that is less than the density of the one or more first zones or lines of absorbent
BE2017 / 0131 material, e.g., the bulk density of the absorbent material and one or more second strand (s) or ribs to form one or more lines of absorbent material having a second density lower than the bulk density of the absorbent material in bulk, wherein the one or more absorbent material line (s) have a first density less than the density of the one or more zones or absorbent material lines of a second density, wherein the one or more first strand (s) have a height greater than the height of the one or more second strand (s) to provide one or more lines of absorbent material having a first density less than the density of one more zone or lines of absorbent material of a second density after compressing the cast absorbent material deposition structure. Because the first strands have a greater height than the second strands, the volume of the die not occupied by the first strand (s) is less where the first strands are positioned than where the second strands (and )) are located thereby reducing the total amount or weight of absorbent material over the thickness of the cast absorbent material deposition structure at locations where the first strands are located compared to the locations where the second strands are located.
The three-dimensional structure introduced into the mold preferably includes strands with a width in the range of 0.1 to 5 mm, preferably in the range of 0.5 to 3 mm, more preferably in the range of 0.8 to 2 mm, to provide zones or lines of absorbent material having a density lower than the density of the one or more first zones or lines of absorbent material, e.g., the bulk density of the absorbent material for the mass, having a width sufficient for sufficient liquid distribution in the absorbent core and / or to improve folding of the absorbent core.
Figure 1 schematically shows an example of a mold cavity (10) comprising a shaping profile element (11, 12, 13). The molding section includes strands (11) that extend substantially in the longitudinal direction of the absorbent core and strands (12) that extend in the transverse direction. The
BE2017 / 0131 strands (12) extending in the transverse direction intersect, preferably at the point where an individual's body extracts a fluid to be absorbed.
The molding profile part comprises strands (13) such that the molding profile part fits snugly into the mold cavity (10) and correct placement of the molding profile part in the mold cavity (10) is ensured.
At the strands (11, 12, 13) of the molding section, less absorbent material can be deposited in the mold cavity, so that second zones of absorbent material are formed which comprise a smaller amount of absorbent material than the first zones of absorbent material formed on the places in the mold cavity where no strands are positioned. The dotted arrows indicate the distribution of liquid in the absorbent core through the second zones comprising a lower amount of absorbent material.
Figure 2 schematically shows another exemplary mold cavity (20) comprising a shaping profile part (11, 12, 13). The difference from Figure 1 is that the strands (12) extending in the transverse direction do not intersect, but meet near the point where an individual's body extracts a fluid to be absorbed.
Figures 5a through 5e schematically show other exemplary mold cavities comprising different molding profile parts such that second zones of absorbent material are formed which comprise a lower amount of absorbent material than the first zones of absorbent material which are formed at the locations in the mold cavity where no strands are positioned.
In Figure 5a, the molding section comprises two strands that intersect, so that a resulting absorbent core can be fabricated with two second zones intersecting, preferably at the point where an individual's body secretes a fluid that is absorbed. Such a cross design may be advantageous for Courtray's acquisition time as herein
BE2017 / 0131 defined by improving the distribution of liquid in the absorbent core.
In Figure 5b, the molding profile portion includes strands that form two v-shaped ends, so that a resulting absorbent core can be fabricated with two second zones that converge to one point proximal of both end portions to form one or two v-shaped ends. Such a design can be advantageous for improving the fit of the body.
Figure 5c combines both strands of Figures 5a and 5b.
In Figure 5d, the shaping profile portion includes strands that form two v-shaped ends and additionally comprise a strand extending substantially longitudinally of the mold cavity from each v-shaped end to the end portions of the mold cavity. Such a design can be advantageous for further improving the fit of the body.
Figure 5e combines both strands of Figures 5a and 5d.
Figure 6a schematically shows another exemplary mold cavity (60) comprising a molding profile part (61), and Figure 6b shows a 3D image of a mold (64), with the same mold cavity (60) and molding profile part (61). In this exemplary embodiment, the cross and v-shaped ends, along with a portion of the strands extending substantially longitudinally of the mold cavity, have a certain height from each V-shaped end to the end portions of the mold cavity ( h2) such that second zones of absorbent material are formed which comprise a lower amount of absorbent material than the first zones of absorbent material which are formed at the locations in the mold cavity where no strands are positioned. The two other strands (65) extending substantially in the longitudinal direction of the mold cavity are corrugated, with varying heights between h2 and h3 (where h3 is less than h2), such that respective second and third zones of absorbent material are formed lower amount of absorbent
BE2017 / 0131 material than the first zones of absorbent material, third zones comprising a greater amount of absorbent material than the second zones of absorbent material. The most distal portions (66) of the strands extending substantially in the longitudinal direction of the mold cavity, from each V-shaped end to the end portions of the mold cavity, are mainly to ensure that the molding profile element fits the mold cavity and to ensure correct placement of the molding section in the mold cavity. Their height is less than h2, and preferably less than or equal to h3.
Measuring wheel thickness
Thickness measurements are performed with a thickness gauge, with an accuracy of 0.1 mm. The diameter of the presser foot is 30 mm and the pressure is 20 g / cm ² .
Thickness measurements are taken immediately after products are taken from a complete package or a complete row of products. The measurement is made in the central part of the product, from the fold lines. The product is placed with the folding paper or the bag towards the table. The pressure foot should be gently lowered to the product. The measurement is taken when the needle is stable. The thickness is measured on at least 3 pieces.
Method for the acquisition of a courtray
The acquisition time method as defined by SGS Courtray Laboratories (Oignies, France) (POA / DF4 - Feminine Hygiene - Multiple acquisition time without pressure) evaluates the rate at which the absorbent core absorbs blood. Synthetic menstrual fluid (dose adjusted based on size) comes in a transparent funnel that allows the user to measure how long it takes the sanitary napkins to fully absorb the dose (T1). After a while, the same measurement is repeated (twice: T2 and T3). The test fluid used is artificial blood such as
BE2017 / 0131 formulated or manufactured by SGS Courtray Laboratories (Oignies, France). This liquid has a viscosity of 7-8 cPa (target 7.5 cPA) measured at a temperature of 21 ° C using a falling sphere type viscometer (category number V-2200, size 2, K-value 3.3) with a glass ball.
Peak bending stiffness method
The purpose of this test is to measure the maximum bending stiffness of a sample, e.g. a napkin, by performing the modified Circular Bending Procedure (based on ASTM D 4032-82). This procedure is a simultaneous multidirectional deformation of a material where one side of the sample becomes concave while the other face becomes convex. This gives a force value related to bending resistance, at the same time an average stiffness in all directions.
1. Material
- Tensile strength tester
- Talcum powder
- Ruler
- A smooth polished steel platform with dimensions 102 x 102 x 11 mm and made with an opening with a diameter of 18.75 mm in the middle. The round edge of the opening is at an angle of 45 ° to a depth of 4.75 mm.
- A plunger with a total length of 72.2 mm, a diameter of 6.25 mm and a ball nose with a radius of 2.97 mm. The plunger must be placed concentrically with the opening and must have equal clearance on all sides.
- Calibration standard for a thickness of 15 mm
2. Procedure
- Take 5 products.
- Remove the relief papers and apply some talcum powder to avoid stickiness.
BE2017 / 0131
- Cut 3 test samples measuring 37.5 x 37.5 mm from the first product. Samples must contain all current layers of the product. Make sure that the samples are not folded or bent. Sample handling should be kept to a minimum and to the edges to avoid flexural properties.
- Three samples of 37.5 x are cut from the other four products
37.5 mm, identical to the samples cut from the first product. This yields 3 sets of five identical examples.
- Place the test plate and plunger on the tensile tester. Use the calibration standard to adjust the tip of the plunger 15 mm from the top of the plate (in the center of the opening).
- Set the plunger speed to 50 cm / min.
- Place a sample (top sheet up) on the plate under the plunger so that the plunger can drop in the center of the sample.
- The maximum force is registered.
- Repeat these steps until all samples have been tested.
- Report the 3 averages of each series of five samples: if one of the significantly absorbing parts of the product has the required bending resistance, the product meets the parameters of this test. Therefore: bending resistance of this product = the largest of the average maximum bending stiffnesses.
Example (s)
Four samples were made, sample A without inserts, samples B to D with insertion types 1 to 3 as illustrated in Figures 3a to 3c.
The acquisition time (AQ) is measured for each of the samples according to the acquisition time method as defined by SGS Courtray Laboratories and Table 1 and Figure 4 illustrates the results.
Table 1: Acquisition time for Examples A to D
BE2017 / 0131
Examplea B C D InsertNo Fig. 3a Fig. 3b Fig. 3c Acquisition time (without pressure) T1 [s] 97.5 76 77.5 80.5 T2 [s] 277.5 175.5 228.5 212 T3 [s] 446 303.5 371 324 Mixions ACQ time [s]T1 + T2 + T3 821 555 677 617
As can be seen from these results, the presence of second zones with a lower amount of absorbent material reduces the acquisition time (samples B, C, D versus sample A). The presence of a V-shaped end as described herein (sample C) and / or the presence of a cross design in the central portion of the absorbent core as described herein (sample B) further reduce the acquisition time.
The peak bending stiffness of samples B, C, D is measured and Figure 7 illustrates the results of bending resistance, lower results show improved fits to the body. All samples show a low bending resistance, so good comfort. The presence of a V-shaped end as described herein (sample C) and / or the presence of a cross design in the central portion of the absorbent core as described herein (sample B) further reduce the flexural resistance and further improve the fit of the body .

BE2017 / 0131

权利要求:
Claims (19)
[1]
Conclusions
An absorbent article absorbent core comprising an absorbent material, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone having at least is partially delimited from the other second zones by the one or more first zones, characterized in that the first amount of absorbent material is different from the second amount of absorbent material, each amount of absorbent material being determined as weight per unit area.
[2]
The absorbent core according to claim 1, wherein the ratio of the second amount of absorbent material in a second zone to the first amount of absorbent material within adjacent one or more first zones is between 0 and 1, preferably from 0.05 to 0.80 is more preferably from 0.10 to 0.70, even more preferably 0.15 to 0.60, most preferably 0.20 to 0.50.
[3]
The absorbent core of claim 1, wherein the absorbent material of the one or more second zones has a second density that is less than a first density of the absorbent material of the one or more first zones, and wherein the absorbent core preferably substantially constant has thickness.
[4]
The absorbent core according to any of the preceding claims, wherein the one or more second zones are in the form of one or more continuous or discontinuous lines, and wherein the absorbent core is preferably a substantially monolithic structure.
[5]
The absorbent core according to any of the preceding claims, wherein the one or more second zones form a pattern symmetrical with
BE2017 / 0131 relates to a central longitudinal axis of the absorbent core and preferably at least two second zones extend along and substantially parallel to the central longitudinal axis on opposite and distal sides thereof.
[6]
The absorbent core according to claim 5, wherein the absorbent core comprises two end portions and a central portion between them extends parallel to the central longitudinal axis of the absorbent core, and wherein at least two second zones converge to one point proximal of at least one , preferably both end parts such that they form one or two v-shaped ends.
[7]
The absorbent core according to claim 5 or 6, wherein the absorbent core has two end portions and a central portion therebetween extending parallel to the central longitudinal axis of the absorbent core, and wherein at least two second zones intersect at a point of the central portion of the absorbent core.
[8]
The absorbent core according to any one of claims 5 to 7, wherein the absorbent core has two end portions and a central portion therebetween extending parallel to the central longitudinal axis of the absorbent core, and wherein at least two second zones run parallel to the central portion and further converging to one point proximal of at least one, preferably both, said end portions such that they form one or two v-shaped ends, preferably wherein the at least two second zones are interconnected by one or more further second zones and / or one or more third zones comprising a third amount of absorbent material, the third amount of absorbent material being different from the first amount of absorbent material and / or second amount of absorbent material, the one or more further second zones and / or one or more third zones extending along the central transverse axis, more preferably in which the one or more further second zones and / or one or more third zones are arranged around a cross-shaped co-connection to the central portion of the absorbent core region.
BE2017 / 0131
[9]
The absorbent core according to any of the preceding claims, wherein the one or more second zones and / or the one or more third zones are in the form of channels, fold lines or combinations thereof.
[10]
An absorbent article comprising an absorbent core according to any of the preceding claims.
[11]
The absorbent article of claim 10, wherein the absorbent article is selected from the group consisting of diapers, adult incontinence pants, training pants, diaper holders, liners, sanitary napkins, surgical dressings, sponges and combinations thereof.
[12]
A method of providing an absorbent core for an absorbent article, the process comprising the steps of:
i. providing a mold cavity comprising a mold profile, the mold cavity preferably having an air-permeable base surface,
11. Introducing one or more absorbent materials into the mold cavity comprising the forming profile member to form a formed absorbent material deposition structure, iii. removing the molded absorbent material deposition structure from the mold cavity to form an absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone at least partially bounded by said one or more first zones, said second zones having the inverted shape of the molding section and said first and second amounts of absorbent material, each measured as a weight per unit area, being different.
[13]
The method of claim 12, comprising the steps of
BE2017 / 0131 iv. applying a first air-permeable material layer, preferably a non-woven web, into the mold cavity comprising the forming profile part prior to the process step of introducing the one or more absorbent materials into the mold cavity; and / or
V. applying a second material layer, preferably a nonwoven web, directly or indirectly to the one or more absorbent materials after the process step of introducing one or more absorbent materials into the mold cavity, vi. optionally applying a bonding step for forming a laminate comprising the first air-permeable material layer, the second material layer and the one or more absorbent materials therebetween, vii. preferably in the process step ii. a pressure difference, preferably a vacuum force, is applied over the air-permeable base surface of the mold cavity to displace the one or more absorbent materials relative to the molding profile member and to form one or more first zones containing a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material.
[14]
A method according to any one of claims 12 to 13, wherein the shaping profile member is a three-dimensional structure, preferably formed by a 3D printing process and wherein the shaping profile part is preferably not in liquid communication with the pressure difference, preferably a vacuum force, applied over the air-permeable base surface of the mold cavity.
[15]
A method according to any one of claims 12 to 13, wherein the molding profile element is in the form of one or more recesses cut into the base surface of the mold cavity and wherein the molding profile part is preferably in fluid communication with the pressure difference, preferably a
BE2017 / 0131 vacuum force, arranged over the air-permeable base surface of the mold cavity.
[16]
A method according to claim 15, wherein the forming profile element is arranged in the mold cavity such that a second pressure difference, preferably a second vacuum force, is provided which is less than, equal to or greater than the pressure difference provided on sections of the base surface distai from said shaping profile member, or wherein the one or more recesses comprise a depth extending perpendicular to the plane formed by the ends and sides of the base and that depth being dimensioned to displace absorbent material in said one or more recesses in which said second vacuum force is equal to the vacuum force imparted on sections of the base distai of said shaping section.
[17]
The method of any one of claims 12 to 16, wherein the one or more second zones are formed in the absence of a direct mechanical action, such as compression of the one or more absorbent materials by embossing.
[18]
The method of any one of claims 12 to 17, wherein the die is 3D printed as a single part comprising said shaping profile member.
[19]
A method according to any one of claims 12 to 18 for providing an absorbent core according to any one of claims 1 to 9.
2017/0131
Η
Fig. 2
Fig. 5d
Fig. 5th
BE2017 / 0131
Fig. 3b
Fig. 3c
BE2017 / 0131
Influence of inserts on acquisition time
Fig. 4
Monster B
Monster C.
Monster D.
Fig. 7
BE2017 / 0131
Q ο λ o 43-4
BE2017 / 0131
Absorbent core for an absorbent article
Abstract:
An absorbent article absorbent core is provided with an absorbent material, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, each second zone at least partially delimited from the other second zones by the one or more first zones, characterized in that the first amount of bulk absorbent material is different from the second amount of absorbent material, each amount of absorbent material being determined as weight per unit area.

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同族专利:

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公开号 | 公开日

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EP3595602B1|2021-08-04|

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EP3595603B1|2021-03-31|

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EP3595603A1|2020-01-22|

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US20190159946A1|2019-05-30|

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BE1025054A1|2018-10-10|

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PL3595602T3|2021-12-20|

---

ES2889582T3|2022-01-12|

---

EP3595602A1|2020-01-22|

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法律状态:
2018-12-05| FG| Patent granted|Effective date: 20181015 |

优先权:

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申请号 | 申请日 | 专利标题

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EP17160763|2017-03-14|

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EP17160763|2017-03-14|EP18709622.7A| EP3595603B1|2017-03-14|2018-03-14|Mould for forming an absorbent core for an absorbent article|

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PCT/EP2018/056392| WO2018167148A1|2017-03-14|2018-03-14|Mould for forming an absorbent core for an absorbent article|

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PL18709621T| PL3595602T3|2017-03-14|2018-03-14|Absorbent core for an absorbent article|

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PCT/EP2018/056389| WO2018167146A1|2017-03-14|2018-03-14|Absorbent core for an absorbent article|

---

US16/313,414| US20190159946A1|2017-03-14|2018-03-14|Absorbent core for an absorbent article|

---

ES18709621T| ES2889582T3|2017-03-14|2018-03-14|Absorbent core for an absorbent article|

---

EP18709621.9A| EP3595602B1|2017-03-14|2018-03-14|Absorbent core for an absorbent article|