ABSORBENT ARTICLE AND PRODUCTION METHOD

专利摘要:
absorbent article and method of production thereof. The present invention solves the problem of providing an absorbent article in which a binding part for bonding a liquid permeable layer to an absorbent core that has been formed in a low basis weight region of the absorbent core and that has all sufficient flexural rigidity of the binding part, sufficient binding strength of the binding part, and sufficient liquid absorption properties. this problem is solved with an absorbent core (4) comprising a first region having a certain basis weight of absorbent material and second regions (regions 411a, 411b) having a lower basis weight of absorbent material than that of the first region, where the basis weight radius of a highly absorbent polymer to the basis weight of the absorbent material in the second regions being set from 10/100 to 47/100, and compressed parts (5a, 5b) being formed within the second regions.
公开号:BR112015016449B1
申请号:R112015016449-8
申请日:2014-01-17
公开日:2022-01-11
发明作者:Hiroki Goda；Shinichi Ishikawa；Ryota Kawamori；Kengo Ochi
申请人:Unicharm Corporation；
IPC主号:

专利说明:

technical field
[0001] The present invention relates to an absorbent article and a method of producing the same. background
[0002] As an absorbent article, a liquid permeable front sheet, a liquid impermeable back sheet, an absorbent body disposed between the front sheet and the back sheet, and a junction section for joining together the front sheet and the absorbent body it has been known where the absorbent body has a low basis weight region and a high basis weight region, and where the junction section is formed in the low basis weight region in JP No. 2010-233839. In absorbent article JP No. 2010-233839, the joint section is formed in the low basis weight region in order to reduce the stiffness of the joint section to improve user comfort and prevent liquid leakage.
[0003] Also the provisions of the State of the Art which are known from JP 2013 009946, JP 2012 239721, EP 0958801, WO 2012/0905508 and EP 2415435. Summary of the InventionProblems to be Solved by the Invention
[0004] However, the absorbent article described in Patent Literature 1 could possibly cause a decrease in the joint strength of the joint section and a decrease in liquid absorption, due to the formation of the joint section in the low basis weight region of the absorbent body.
[0005] Accordingly, the present invention is directed to providing an absorbent article comprising a junction section which joins a liquid permeable layer and an absorbent core, wherein the junction section is formed in a region of low basis weight. of the absorbent core, and having sufficient bending flexibility at the joint section, sufficient joint strength at the joint section, and sufficient liquid absorption, as well as a method of producing the same. Solution to the Problem
[0006] In order to solve the above problems, the present invention provides an absorbent article as claimed in claim 1. Further, the present invention provides a method for producing the absorbent article of the present invention. Effects of the Invention
[0007] In accordance with the present invention, an absorbent article comprising a seam section which joins together a liquid permeable layer and an absorbent core, wherein the seam is formed in a low basis weight region of the absorbent core, and having sufficient bending flexibility in the joint section, sufficient joint strength in the joint section, and sufficient liquid absorption, as well as a method for producing the same being provided. Brief Description of Drawings
[0008] For a better understanding of the invention, a detailed description of the same will be made, with respect to the attached drawings, presented as an example and not a limitation, in which:- Figure 1 is a perspective view of a disposable diaper according to with an embodiment of the present invention;- Figure 2 is an exploded plan view showing a state of the disposable diaper of Figure 1 in which the connection between a front section and a back section has been released;- Figure 3 is an exploded perspective view the disposable diaper of Fig. 1; - Figure 4(a) is a plan view of the absorbent body provided in the disposable diaper of Fig. 1; - Figure 4(b) is a sectional view taken along line AA of Figure 4(a); - Figure 5(a) is a plan view of an absorbent core (before forming a joint section) provided in the absorbent body of Figure 4; - Figure 5(b) is a cross-sectional view taken along the line B-B of Figure 5(a); - Figure 6 is a view to explain the production steps for the absorbent article of Fig. 4. Description of Settings
[0009] An absorbent article and the production method of the present invention will be explained below.[Absorbent Article]
[00010] An absorbent article according to an embodiment (Embodiment 1) of the present invention is one comprising a first liquid-permeable layer, a liquid-impermeable layer, an absorbent core disposed between the first liquid-permeable layer and the impermeable layer. and a junction section which joins the first liquid-permeable layer together with the absorbent core wherein the absorbent core comprises as absorbent materials a hydrophilic fiber and a superabsorbent polymer, wherein the absorbent core has a first region having a predetermined absorbent material of basis weight and a second region having a predetermined basis weight absorbent material that is less than that of the first region, wherein the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the third region being 10/100 at 47/100, where the joint section is formed within the second region, and is a compressed section which integrates the liquid permeable layer with the absorbent core in the thickness direction, and wherein the ratio of the basis weight of the superabsorbent polymer to the basis weight of the absorbent material in the second region is from 23/100 to 92/100 times the weight ratio of basis of the superabsorbent polymer to the basis weight of the absorbent material in the first region
[00011] The absorbent article according to Configuration 1 has sufficient bending flexibility at the joint section, sufficient joint strength at the joint section, and sufficient liquid absorption (especially liquid absorption in the case of repeated liquid).
[00012] The joint strength and bending flexibility of the joint section are associated with the adhesion strength between the hydrophilic fiber and superabsorbent polymer produced in the joint section. In this regard, in the absorbent article according to configuration 1, a junction section is formed within the second region (low basis weight region) having a ratio of the basis weight absorbent polymer to the basis weight absorbent material at absorbent material of basis weight from 10/100 to 47/100, and thus the adhesion strength between the hydrophilic fibers and the superabsorbent polymer produced at the junction section is sufficient.
[00013] Liquid absorption (especially liquid absorption in the case of repeated liquid absorption) is associated with the mobility of the liquid within the absorbent core. In this regard, in the absorbent article according to configuration 1, a junction section is formed within the second region (low basis weight region) having a basis weight superabsorbent polymer to absorbent material ratio of 10/100 to 47/100, and thus the mobility of the liquid within the absorbent core is less susceptible to restriction by the junction section. This is to say that voids in the part of the absorbent core where the junction section is formed are expanded by swelling of the superabsorbent polymer of predetermined basis weight ratio, as a result of absorption to liquid, and thus the mobility of the liquid in the part of the absorbent core. absorbent core being sufficient.
[00014] The number of liquid permeable layers in the absorbent article according to configuration 1 is not particularly limited as long as it is 2 or more. The liquid permeable layer includes, for example, the front sheet disposed on the side of the skin (the side with which the wearer's skin contacts) of the absorbent article, a second sheet disposed between the front sheet and the absorbent core, a core wrap covering absorbent core etc. The liquid permeable layer with which the absorbent article according to Configuration 1 may be provided includes, for example, a combination of a front sheet and a core wrap, a combination of a front sheet and a second sheet, a combination of a front sheet, a second sheet and a core wrap etc.
[00015] When the number of liquid-permeable layers provided in the absorbent article according to the configuration is 2 or more, one or more of the liquid-permeable layers may bond with the absorbent core at the junction section. One or more liquid permeable layers will not be joined to the absorbent core by the seam section. For example, when the absorbent article according to Configuration 1 comprises a front sheet and a core wrap as liquid permeable layers, only the core wrap may be joined to the absorbent core by the seam section.
[00016] In a preferred configuration (Configuration 2) of the absorbent article according to Configuration 1, the absorbent article has a longitudinal direction and a transverse direction, and a second region having two regions extending in the longitudinal direction of the absorbent article, and the junction section being formed within each of the two regions. In the absorbent article according to Configuration 2, two joint sections extending in the longitudinal direction of the absorbent article are formed. In this case, since the mobility of the liquid in the part of the absorbent core that lies between the two junction sections is susceptible to restriction by the junction sections, the liquid being easily accumulated in the absorbent core part, and thus the absorbed liquid and retained in the absorbent core portion tends to leak out (or cause re-wetting). However, in the absorbent article according to Configuration 1, the mobility of the liquid within the absorbent core is less susceptible to restriction by the junction section, as described above. Therefore, the effects of the absorbent article according to Configuration 1 are noted in Configuration 2.
[00017] In a preferred configuration (Configuration 3) of the absorbent article according to any one of Configurations 1 to 2, the basis weight absorbent material of the second region will be from 34/100 to 73/100 times the absorbent material of basis weight of the first region.
[00018] In a preferred configuration (Configuration 5) of the absorbent article according to any one of Configurations 1 to 4, the liquid permeable layer is a core wrap covering the absorbent core.
[00019] In a preferred configuration (Configuration 6), of the absorbent article according to any one of Configurations 1 to 5, the junction section has a junction resistance of 0.065 N/25 mm or more.
[00020] In a preferred configuration (Configuration 7) of the absorbent article according to any of Configurations 1 to 6, the joint section has a flexural strength stiffness of 9 gf-cm2/cm or less, as determined by KES measurement.
[00021] In a preferred configuration (Configuration 8) of the absorbent article according to any one of Configurations 1 to 7, the absorbent article still has an absorption time of 140 seconds or less or less on the third or fourth drips when repeated drips 40 mL of artificial urine four times at a drip rate of 8 mL/sec. and at 5-minute intervals.
[00022] In the absorbent article of the present invention, two or more configurations may be combined.
[00023] The type and application of the absorbent article of the present invention are not particularly limited. Absorbent articles include, for example, hygiene articles and sanitary articles including disposable diapers, sanitary pads, panty liners, incontinence pads, perspiration sheets etc., which may be proposed for humans or animals such as domestic animals, others that humans. The liquid to be absorbed by the absorbent article is not particularly limited and includes, for example, liquid excreta, body fluids, etc., discharged from the wearer.
[00024] In the following, a configuration of the absorbent article of the present invention will be explained with reference to the drawings, taking a disposable diaper as an example.
[00025] As shown in Figures 1 and 2, the diaper 1 according to an absorbent article configuration of the present invention has a front section 11 which contacts the wearer's abdominal region, a middle section 12 which contacts the wearer's section, and a 13 which contacts the buttocks and/or back of the wearer. In Figure 2, the X-axis direction corresponds to the width direction of the diaper 1 in the developed state, the Y-axis direction corresponds to the longitudinal direction of the diaper in the developed state, and a flat direction extended in the X-axis and Y-axis corresponding to the flat direction of diaper 1 in the developed state. This also applies to other Figures.
[00026] As shown in Figure 1, both edges 111a, 111b of the front section 11 and both edges 131a, 131b of the rear section 13 are joined together at the joint parts 14a, 14b to form a waist opening defined by the edge 112 of the front section 11 and the edge 132 of the back section and the leg openings defined by both edges 121a, 121b of the middle section 12, and whereby the diaper has a pant-like shape.
[00027] As shown in Figures 1 to 3, the diaper 1 comprises a liquid-permeable front sheet 2, a liquid-impermeable back sheet 3, and an absorbent body 4 disposed between the front sheet 2 and the back sheet 3. These figures will be explained below.<Front Sheet>
[00028] Front sheet 2 is an example of a liquid permeable layer which is joined to the absorbent core by the seam section.
[00029] As shown in Figures 1 to 3, a portion of the front sheet 2 (a portion of the matching region of the absorbent body 4) is exposed from the opening 61 which is formed substantially at the center of the cover sheet described later, to form a skin side surface of diaper 1. The matching region of the absorbent body 4 is a region in which the absorbent body overlaps with the front sheet 2 when the absorbent body 4 is projected onto the front sheet 2. In this configuration, the matching region of the absorbent body is substantially the entire front sheet 2 (see Fig. 2).
[00030] Front sheet 2 is a liquid permeable sheet through which the user's liquid droppings can penetrate. The front sheet 2 includes, for example, a non-woven material, a woven material, a synthetic resin film having liquid permeation holes formed therein, a sheet in the form of a net having a weft, etc. and being preferably of non-woven material.
[00031] Non-woven materials, include, for example, air-through non-woven material, continuous filament non-woven material, stitch-bonded non-woven material, hydro-entangled non-woven material, needling non-woven material, melt-blown non-woven material breath, and combinations thereof.
[00032] The fibers that make up the non-woven material include, for example, natural fibers (such as wool, cotton etc.), regenerated fibers (such as rayon, acetate etc.), inorganic fibers (such as glass fibers, carbon fibers etc.), synthetic resin fibers (polyolefins such as polyethylene, polypropylene, polybutylene, ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, ethylene acrylic acid copolymer, ionomer resins etc., polyesters such as polyethylene terephthalate, acid polylactic, etc., and polyamides such as nylon, etc.). The morphology of the fibers constituting the non-woven material include conjugated fibers such as sheath-core type fibers, side-by-side type fibers, sea island type fibers etc., hollow type fibers, profiled fibers such as flat fibers, Y, C-shaped fibers etc., three-dimensionally crimped crimp fibers, divisible fibers capable of being split by a physical load such as water flow, heat, embossing, etc.
[00033] Methods for producing a non-woven material include, for example, a method in which a web (wool) is formed and the fibers are physically or chemically bonded together. Methods for forming networks include, for example, continuous filament methods, dry methods (carding methods, continuous filament methods, blow blown methods, dry method, etc.), wetted methods, etc., and bonding including for example thermal bonding methods, chemical bonding methods, needling methods, spot bonding methods, hydroentanglement methods etc. Other than non-woven materials produced in this manner, a hydroentanglement formed into a sheet formed by a hydroentanglement method may be used as the front sheet 2. In addition, a nonwoven material having irregularities on the side surface of the skin (for example, a non-woven material having on the side of the top layer irregularities formed by shrinking the side of the bottom layer containing heat-shrinkable fibers, a non-woven material having irregularities formed by the application of air during forming of the net etc.) may be used as a front sheet 2 The formation of irregularities in this way on the side surface of the skin reduces the area of contact between the front sheet and the skin.
[00034] The thickness, basis weight, density, etc., of the front sheet 2 may be suitably adjusted within a range within which liquid excreta discharged from the user may permeate through it. When a non-woven material is used as the front sheet 2, the fineness, fiber length and density of the fibers constituting the non-woven material, the basis weight and thickness of the non-woven material, etc., can be appropriately adjusted in view of the permeability to liquid excrement, skin touch, etc.
[00035] In view of the increased masking property of the front sheet 2, an inorganic filler such as titanium oxide, barium sulfate, calcium carbonate etc. can be added to the non-woven material used as the front sheet 2. When the fibers of the non-woven material are of the sheath-core type conjugated fibers, an inorganic filler may be contained only in the core or may be contained in the sheath.<Back Sheet>
[00036] The backsheet 3 is an example of the liquid impermeable layer. As shown in Figures 1 to 3, the backsheet forms the side surface of the garment of diaper 1.
[00037] The backsheet 3 is a liquid impermeable sheet capable of preventing liquid excreta absorbed and retained in the absorbent body from leaking. The backsheet 3 includes, for example, waterproof treated non-woven materials (e.g. dot-bonded non-woven material, continuous filament non-woven material, hydro-entangled non-woven material etc.), synthetic resin films such as polyethylene , polypropylene, polyethylene terephthalate etc.), sheet composed of a non-woven material and film of synthetic resin.
[00038] The thickness, basis weight, density etc. of the backsheet 3 may be suitably adjusted within a range within which leakage of liquid excreta absorbed and retained in the absorbent body 4 can be prevented. The backsheet preferably has a permeability to gas or moisture, as well as impermeability to liquid, in order to reduce the stuffy feeling during use.< Absorbent Body>
[00039] As shown in Fig. 2, the absorbent body 4 is arranged extended from the front section 11 to the rear section 13 through the intermediate section 12.
[00040] As shown in Figs. 3 and 4, the absorbent body 4 comprises absorbent core 41 containing absorbent materials, absorbent wrappers 42a, 42b covering the absorbent core 41, and compressed section 5a, 5b which integrate the absorbent core 41 with the core wrapper 42a in the thickness direction of the absorbent body 4.
[00041] The core wrap 42a is an example of a liquid permeable layer which is joined to the absorbent core by the seam section, and compressed sections 5a, 5b being an example of a seam section for joining together the liquid permeable layer and the absorbent core.
[00042] As shown in Figure 4, the core wrapper 42a covers a surface of the absorbent core on the side of the front sheet 2, and the core wrapper covers a surface of the absorbent core 41 on the side of the backsheet 3. The core wraps 42a, 42b prevent the absorbent core 41 from being destroyed.
[00043] The core wrappers 42a, 42b are liquid permeable sheets through which the user's liquid excreta can permeate. The core wraps 42a, 42b include, for example, a non-woven material, a woven material, a synthetic resin film having liquid permeation holes formed therein, a net-shaped sheet having a weft, etc., and being preferably a non-woven material. The non-woven material includes, for example, those illustrated in connection with the front sheet 2.
[00044] Although the core shells 42a, 42b are separate members in this configuration, the core shells 42a, 42b may be a continuous member. Furthermore, although a portion of the surface of the absorbent core 41 is not covered with the core wrapper 42a, 43 in this configuration, the entire surface of the absorbent core 42 may be covered with the core wrappers 42a, 43b.
[00045] The absorbent core 41 comprises a hydrophilic fiber and a superabsorbent polymer as absorbent materials. In addition to the absorbent materials, the absorbent core 41 may optionally comprise additives such as antioxidants, mild stabilizers, UV absorbers, neutralizing agents, nucleating agents, epoxy stabilizers, lubricants, antimicrobial agents, flame retardants, antistatic agents, pigments, pigments, plasticizers. etc. For example, the absorbent core 41 may exhibit functions such as deodorizing effect, antibacterial effect, heat absorption effect, etc., by incorporating silver, copper, zinc, silica, activated carbon, aluminum silicate compounds, zeolites, etc.
[00046] Hydrophilic fibers include, for example, wool pulps (e.g. mechanical pulps such as cellulose pulp, refined cellulose pulp, thermomechanical cellulose. chemi-thermomechanical cellulose etc., chemical cellulose such as Kraft cellulose, sulfide cellulose, alkaline cellulose etc., semi-chemical cellulose etc.) obtained from softwood or compact wood as raw material, mercerized cellulose obtained by subjecting wool pulp to a chemical treatment or cross-linked cellulose, non-wool cellulose such as bagasse, kenaf, bamboo, hemp, cotton (e.g. cotton linters) etc., regenerated fibers like rayon, fibrillary rayon etc., semi-synthetic celluloses like acetate, triacetate etc. Among these, cellulose pulp cellulose will be preferred, in view of the low cost and easy moulding.
[00047] The superabsorbent polymer (Superabsorbent Polymer: SAP) includes, for example, superabsorbent polymers of the salt-based type of polyacrylic acid, salt-based polysulfonic acid type, anhydrous polyvinyl salt-based type, polyacrylamide-based type, alcohol-based type polyvinyl, polyethylene oxide based type, polyaspartic acid salt based type, polyglutamic acid based type, polyalginic acid salt based type, starch based type, cellulose based type etc., starch based type superabsorbent polymers , or of the cellulose-based type, such as acrylic acid-starch graft (salt) copolymers, saponified products of starch acrylonitrile copolymers, cross-linked products of sodium carbozimethyl cellulose, etc., and among these, superabsorbent polymers based on salt of polyacrylic acid (particularly based on sodium polyacrylate) being preferred. The form of the superabsorbent polymer includes, for example, particulate, fibrous, flaky etc., and in the case of the particulate form, the particle size being preferably from 50 to 1000 µm, and more preferably from 100 to 600 µm.
[00048] As shown in Figures 4 and 5, the absorbent core 41 is partitioned into regions 411a, 411b (corresponding to the "second region" in the absorbent article of the present invention) and another area (corresponding to the "first region" in the absorbent article of the present invention). present invention), when the surface of the absorbent core 41 on the side of the core wrapper 42a is viewed in plan view. Incidentally, the absorbent core 41 is split in the same manner when the surface of the absorbent core 41 on the side of the core wrapper 42b is viewed in plan view.
[00049] Regions 411a, 411b are regions of low basis weight having absorbent material of lower basis weight than that of another region, and the other region being a region having absorbent material of higher basis weight than that of the other regions. regions 411a, 411b. The basis weight absorbent material of a given region is calculated as the sum of the basis weights s of various absorbent materials contained in that region. The basis weight measurement may be carried out in accordance with a conventional method. For example, (1) the area to be measured is marked and its surface area: Saα (m2) being measured; (2) the marked area is cut with a sharp blade, eg a cutter blade, and the total weight TM (g) being measured; (3) the basis weight BSα (g/m2) of the area to be measured is determined by the following formula: BSα (g/m2) = TM (g)/Saα (m2).
[00050] The basis weight of the absorbent material from low basis weight regions will preferably be from 34/100 to 73/100 times, and more preferably from 34/100 to 55/100, the basis weight of the absorbent material from the region high base weight. The greater difference in basis weight between the high basis weight region and the low basis weight regions within a possible range, the greater folding of the absorbent body occurs along the low basis weight regions of the absorbent body after it to be worn, and thus it is possible to prevent the comfort from being deteriorated due to forming into an unexpected form. For example, when the light weight absorbent material of the higher basis weight region is set at 300 to 600 g/m2, the higher basis weight material of the low basis weight regions may be set from 102 to 438 g /m2.
[00051] The ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions (basic weight superabsorbent polymer in the low basis weight regions / basis weight absorbent material in the low basis weight regions low basis weight) is 10/100 to 47/100, For example, when the basis weight absorbent material of the low basis weight regions is set from 102 to 438 g/m2, the basis weight superabsorbent material of the low basis weight regions may be established from 35 to 319 g/m2. When the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions is less than 10/100, the joint strength of the compressed sections 5a, 5b will be significantly decreased, and thus there is the possibility that deformation, disintegration, fragmentation, or the like, of the absorbent body 4 may occur during use of the diaper 1, resulting in leakage of liquid excrement. In addition, the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions of less than 10/100 could reduce the movement of liquid excrement within the absorbent core 41, resulting in a significant decrease in absorption. of liquid (especially absorption of liquid in the case of repeated absorption of liquid) of the absorbent core 41. Whereas when the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions is greater than 47/100, the flexural rigidity of the compressed sections 5a, 5b being increased significantly, and thus deteriorating the comfort of the diaper 1, and thus there being a possibility that leakage of liquid excrement may occur.
[00052] The lower limit of 10/100 is determined in view of both increasing the joint strength of the compressed sections 5a, 5b and improving liquid absorption (especially liquid absorption in the case of repeated liquid absorption). The ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions of 10/100 or more makes it possible to communicate the compressed sections 5a, 5b with a joint strength of 0.65 N/25 mm or more and achieving an absorption time of 140 seconds or less on the third and fourth drips when repeating a 40 mL drip of artificial urine four times at the drip rate of 8 mL/sec. and 5 minutes apart.
[00053] The joint strength of the compressed sections 5a, 5b increases with increasing ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions and whereby liquid absorption, especially, absorption to liquid in the case of repeated absorption of the liquid) is increased. For example, the joint strength of the compressed sections 5a, 5b increases with an increase in the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions from 10/100 to 11.8/100.25 /100 to 40/100, and 45.5/100 and thus the liquid absorption (especially liquid absorption in the case of repeated liquid absorption) is improved. Thus, the ratios of 10/100, 11.8/100, 25/100, 40/100 and 45.5/100 may have significance as a lower limit in view of increasing the joint strength of the compressed sections 5a, 5b and improving the liquid absorption in case of repeated liquid absorption.
[00054] The upper limit of 47/100 is determined in view of the decrease in bending stiffness of the compressed sections 5a, 5b. The ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions of 47/100 or less makes it possible to give the compressed sections 5a, 5b with a bending stiffness of 9 gf-cm 2 /cm or less.
[00055] The flexural stiffness of the compressed sections 5a, 5b decreases as the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material decreases in the low basis weight regions. For example, the flexural stiffness of the compressed sections 5a, 5b decreases with decreasing the ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions of 47/100 to 45.5/100, 40 /100, 25/100 and 11.8/100, Therefore, the ratios of 47/100, 45.5/100, 40/100, 25/100 and 11.8/100 may have significance as an upper limit, in view of the decrease in bending stiffness of the compressed regions 5a, 5b.
[00056] The ratio of the basis weight superabsorbent polymer to the basis weight absorbent material in the low basis weight regions is from 10/100 to 47/100, preferably from 10/100 to 40/100, and more preferably from 12/100 to 35/100, in view of three perspectives, namely, increased joint strength of compressed sections 5a, 5b, decreased bending stiffness of compressed sections 5a, 5b, and increased liquid absorption (especially, absorption to liquid in case of repeated absorption to liquid).
[00057] The ratio of the superabsorbent polymer in the low basis weight regions to the absorbent material of the basis weight in the low basis weight regions (high basis weight region superabsorbent polymer / basis weight absorbent material of the high basis weight region) will preferably be from 33/100 to 66/100. And it is preferably from 40/100 to 60/100. If the hydrophilic fiber ratio is too high, the resulting absorbent body will be compact and provide a poor feel in wear, while if the hydrophilic fiber ratio is too low, many cracks may occur. be generated in the absorbent body after absorption of the liquid, and thus leading to deterioration in performance. For example, when the basis weight absorbent material of the high basis weight region is set at 300 to 600 g/m 2 , the basis weight superabsorbent polymer may be set at 99 to 396 g/m 2 .
[00058] The ratio of the superabsorbent polymer of the low basis weight regions (superabsorbent polymer of the basis weight of the low basis weight regions / absorbent material of the basis weight of the low basis weight regions) will be 23/100 to 92/100 times. 33/100 to 66/100 times the high basis weight superabsorbent polymer ratio (high basis weight region superabsorbent polymer / basis weight absorbent material in the high basis weight region) is more preferable. .
[00059] The thickness and density of the absorbent core 41 may be adjusted accordingly depending on the required properties of the diaper 1 (e.g. absorbency, strength, light weight etc.). The thickness of the high basis weight region is greater than that of the low basis weight regions, and being typically 2.0 to 5.0 mm, and the density of the high basis weight region being higher than that of the low basis weight regions. base, and typically being from 0.05 to 0.6 g/cm3 , and preferably from 0.06 to 0.3 g/cm3 .
[00060] In this configuration, the number of low basis weight regions of the absorbent core is two (regions 411a, 411b), and may be 3 or more.
[00061] The region 411a comprises a junction section forming a region in which the junction section 5a is formed, and a peripheral region surrounding the junction section forming the region. The region 411b comprises a junction section forming a region in which the junction section 5b is formed, and a peripheral region surrounding the junction section forming the region.
[00062] As shown in Fig. 4, regions 411a, 411b are spaced apart from each other by a constant distance, and extending in the longitudinal direction of the absorbent core 41. The distance between regions 411a and 411b (the distance between the lines of regions 411a and 411b, extending in the longitudinal direction) may be adjusted appropriately depending on the size, etc., of the absorbent core 41, and being typically from 20 to 80 mm, and preferably from 30 to 60 mm.
[00063] As shown in Figs. 4 and 5, regions 411a, 411b have a substantial linear shape. The lengths and widths of the regions 411a, 411b may be adjusted accordingly depending on the size etc. of the absorbent core 41. The length is typically from 10 to 600 mm, and preferably from 20 to 400 mm, and the width is typically from 1 to 400 mm. 20 mm, and preferably from 2 to 15 mm.
[00064] The position, shape, size etc. of regions 411a, 411b are not particularly limited, while compressed sections 5a, 5b may be formed within regions 411a, 411b, and may be adjusted accordingly depending on the positions, shapes , sizes etc. of the compressed sections 5a, 5b to be formed. Although regions 411a, 411b have a substantial linear shape in this configuration, regions 411a, 411b may be partially or entirely curved (e.g., in a wavy shape, a zigzag shape, etc.). Furthermore, the longitudinal end parts of the regions 411a, 411b may be connected together to form a ring shape (e.g., a circular shape, an elliptical shape, a heart shape, etc.).
[00065] The absorbent material of basis weight, shape, size, etc., of regions 411a, 411b may be the same or different, and in this configuration, are substantially the same.
[00066] As shown in Fig. 4, the compressed section 5a is formed within the region 411a, and the compressed section 5b is formed within the region 411b.
[00067] The compressed sections 5a, 5b are concave sections formed by a heat etching treatment. In the heat etching treatment, the core wrap 42a and the absorbent core 41 are compressed in the thickness direction and heated. Consequently, the compressed sections 5a and 5b which integrate the core shell 42a and the absorbent core 41 in the thickness direction of the absorbent body 4 are formed as concave sections.
[00068] The heat etching treatment may be carried out by, for example, an embossing process of the core wrapper 42a and the absorbent core 41 by passing them between a recording cylinder having patterned protruding parts and a flat cylinder. In this process, heating during compression can be carried out by heating the recording cylinder and/or the flat cylinder. The shapes, matching, pattern, etc., of the protruding parts of the recording cylinder are set to match the shapes, matching pattern, etc., of the compressed sections 5a, 5b.
[00069] In the etching treatment, the heating temperature is typically 80°C to 140°C, and preferably 90° to 120°C, the linear pressure (the pressure force per unit width of the pressed part) being typically 10 at 200 N/mm, and preferably from 40 to 100 N/mm, and the processing speed being typically from 10 to 500 m/min., and preferably from 20 to 30 m/min.
[00070] As shown in Figs. 3 and 4, the compressed sections 5a, 5b are spaced apart from each other by a constant distance, and extending in the longitudinal direction of the absorbent body 4. The distance between the compressed sections 5a, 5b may be adjusted accordingly depending on the size, etc., of the absorbent body 4 and being typically from 20 to 80 mm, and preferably from 30 to 60 mm.
[00071] As shown in Figs. 3 and 4, the compressed sections 5a, 5b have a substantially linear shape. The lengths and widths of the compressed sections 5a, 5b may be adjusted accordingly depending on the size etc. of the absorbent core 41. The lengths are typically from 8 to 590 mm, and preferably from 18 to 390 mm, and the widths are typically 0 mm. .5 to 12 mm, and preferably from 1 to 8 mm.
[00072] The positions, shapes, sizes etc. of the compressed sections 5a, 5b may be adjusted accordingly depending on the junction resistance to be achieved by the compressed sections 5a, 5b. Although the compressed sections 5a, 5b have a substantially linear shape in this configuration, the compressed sections 5a, 5b may be partially or entirely curved (e.g. in a wavy shape, a zigzag shape etc.). Furthermore, the longitudinal end parts of the compressed sections 5a, 5b may be connected together to form a ring shape (e.g. a circular shape, an elliptical shape, a heart shape, etc.). In addition, the compressed sections 5a, 5b may be formed in the form of dots dispersed in a given pattern (eg a staggered grid pattern etc.).
[00073] The compressed sections 5a, 5b are an example of a junction section that joins together the liquid permeable layer and the absorbent core. The joining section may be formed by a joining method other than the heat etching method, for example by a joining method such as ultrasonic embossing, adhesive bonding, etc.
[00074] The joint strength of the compressed section 5a, 5b will preferably be 0.065N/25mm or more, and more preferably 0.07N/25mm or more. The upper limit of the joint strength of the compressed echoes 5a, 5b is typically 0.5N/25mm or more, and preferably 0.4N/25mm. The joint strength of the compressed sections 5a, 5b of 0.065 N/25 mm or more reduces the deformation, disintegration, fragmentation of the absorbent body 4 that may occur during the use of the diaper 1, and consequently the absorbent body 4 being maintained in a normal, and thus reducing the occurrence of leakage of liquid excrement.
[00075] With respect to the joint strength of the compressed sections 5a, 5b, "N/25 mm" means a joint strength (N) per mm of width in the plane direction of the interface between the core wrap 42a and the absorbent core 41 , including for example the longitudinal direction (conduction direction (MD direction) during manufacture) of the absorbent body 4, the transverse direction (a direction (CD direction) perpendicular to the MD direction) of the absorbent body 4 etc., and preferably being the longitudinal direction (MD direction) of the absorbent body 4.
[00076] The junction resistance of the compressed sections 5a, 5b can be measured as follows. A sample piece (200 mm long x 25 mm wide) under a standard condition (under a temperature of 20°C and a humidity of 60%) being mounted on a tensile testing machine (e.g. AGS-1kNG manufactured by Shimadzu Corporation) by attaching the absorbent core 41 to an upper grip and securing the core wrap 42a to a lower grip at an inter-mandrel distance of 25 mm, and applying a load to the sample at an elastic speed of 200 mm/min. until the core shell 42a and the absorbent core 41 being completely released apart from each other (maximum load) to measure the joint strength “N/25 mm” meaning the bond strength (N) per 25 mm width of the sample piece when the longitudinal direction of the sample piece is taken as the elastic direction.
[00077] A sample piece that is used for bond strength measurement is cut from the absorbent body 4 to include a part of the compressed part 5a (or compressed part 5b). In this configuration, the compressed sections 5a, 5b extend in the longitudinal direction of the absorbent body 4, and thus the sample piece may include any part of the compressed section 5a (or compressed section 5b). If the compressed sections extend in various directions, as distinct from this configuration, it will be preferred to cut a sample piece from the absorbent body 4 to include a portion extending in the longitudinal direction of the absorbent body 4. Furthermore, it will be preferred that the longitudinal direction of the sample piece coincides with the extended direction of the compressed section. In this configuration, a sample of the part (e.g. 200 mm long x 25 mm wide) having a longitudinal direction that coincides with the extended direction of the compressed section 5a (or compressed section 5b) may be prepared by cutting the absorbent body 4 along both sides of the compressed section 5a (or compressed section 5b) extended in the longitudinal direction and cutting the absorbent body 4 perpendicular to the compressed section 5a (or compressed section 5b) extended in the longitudinal direction, and the resulting sample piece can be used in the measurement of junction resistance.
[00078] The flexural stiffness of the compressed sections 5a, 5b, as determined by the KES (Kawabata Assessment System) measurement is preferably 9 gf-cm 2 /cm or less, and more preferably 8 gf-cm 2 /cm. The lower limit of the bending stiffness of the compressed sections 5a, 5b, as determined by the KES measurement, is typically 2 gf-cm 2 /cm, and preferably 4 gf-cm 2 /cm. Due to the flexural rigidity of the compressed sections 5a, 5b of 9 gf-cm2/cm, as determined by the KES measurement, the wearer will be able to wear the diaper 1 without feeling uncomfortable.
[00079] A detailed explanation of the KES measurement is described in “Standardization and Manual Evaluation Analysis (second ed.”) (author: Sueo Kawabata, published by The Textile Machinery Society of Japan, The hand evaluation measurement and standardization research committee, 1980) .
[00080] In KES measurement, a sample piece cut to a predetermined size (e.g. 150 mm long x 20 mm wide) is clamped by chucks arranged at a predetermined distance (2 cm), and subjected to pure bending at a constant curvature by changing the rate in the bending range K = 0 to 0.3 (cm-1), to determine the bending stiffness B per unit length (gf-cm2/cm) of the slope of the MK curve. Incidentally, M is the bending moment per unit length (gf-cm/cm) of the sample piece. The B value is determined as a slope from bending moment to curvature when the part sample is bent towards the side of the front surface and the slope becoming substantially constant.
[00081] KES measurement, for example, could be implemented using KES0FB2-L from Kato Tech Co., Ltd. By doing this, several parameters could be set as follows:- Measurement mode: half-cycle- SENS: 2 x 1- Drilling distance: 2 cm- Maximum curvature> 0.5 cm-1- Number of repetitions: 1- Bending Stiffness Value B (g-cm2/cm) is the slope in curvature K = 0.0 to 0.2.
[00082] It will be preferable for the absorbent body 4 to have an absorption time of 140 seconds or less on the third and fourth drips when repeating a 40 mL drip of an artificial urine four times at a drip rate of 8 mL/sec . and at 5-minute intervals. Consequently, liquid faeces rapidly diffuses beyond the compressed sections 5a, 5b, and thus preventing the liquid faeces from being concentrated in the introductory part (urination part), and thus being possible to provide the wearer with the feeling of dryness.
[00083] The core wrap 42a and/or absorbent core 41 may contain a thermoplastic resin fiber. When the core wrap 42a and/or absorbent core 41 contains a thermoplastic resin fiber, the core wrap 42a and the absorbent core may be heat fused together by melting and solidifying the heat fused fiber during formation of the compressed sections 5a , 5b. For example, when the heat melted fiber is a composite fiber, the core wrap 42a and the absorbent core 41 may be heat melted together by melting and solidifying a resin having a low melting point (e.g. sheath component of a sheath-core conjugate fiber).
[00084] The thermoplastic resin fiber is not particularly limited while the intersections of the fibers may be heat melted. The thermoplastic resin constituting the thermoplastic resin fiber includes, for example, polyolefins, polyesters, polyamides, etc. Polyolefins include, for example, linear low density polyethylene (LLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene, polybutylene, copolymers primarily comprising these components ( for example, ethylene vinyl acetate (EVA) polymer, ethylene ethyl acrylate (EEA) copolymer, ethylene acrylic acid (EAA) copolymer, ionomer resins, etc.). Polyethylenes, particularly HDPE are preferred as they have excellent thermal processing properties as well as low stiffness and flexible feel. Polyesters include, for example, branched or straight chain polyhydroxy alkanoic acid polyesters having carbon atoms of up to 20, including polyethylene terephthalate (PET), poly(trimethylene terephthalate) (PTT), polybutylene terephthalate (PBT) , polylactic acid, polyglycolic acid etc., and copolymers principally comprising such polyesters, or copolymerized polyesters formed by copolymerization as a major component of an alkylene terephthalate with a minor amount of other components. PET is preferred from the point of view of being able to form fibers and non-woven material having high damping properties due to having elastic resilience and from the economic point of view of industrial viability at a low cost. Polyamides include, for example, Nylon-6, Nylon-6,6 etc.
[00085] The shape of the thermoplastic resin fibers contained in the front sheet 2 includes, for example, sheath-core type, side-by-side type, sea island type, etc. In view of the thermal adhesive properties, conjugated fibers are preferably composed of a core part and a sheath part. The cross-sectional shape of the core in sheath-core type conjugated fibers includes, for example, circular type, triangular type, square type, star-shaped etc., and the core part may be hollow or porous. The cross sectional area ratio of the sheath/core structure is not particularly limited, but is preferably from 80/20 to 20/80, and more preferably from 60/40 to 40/60,
[00086] The thermoplastic resin fibers may be provided with a three-dimensional crimped shape. Consequently, even if the fiber orientation is aligned to the plane direction, the buckling resistance of the fibers is exerted in the thickness direction, thus making the fibers more rigid to crush even if an external force is applied to them. The three-dimensional crimped shape includes, for example, a zigzag shape, and an omega shape, a spiral shape, etc., and the method of designing a three-dimensional crimped shape includes, for example, mechanical crimping, heat shrink shaping, etc.
[00087] Mechanical crimping can be controlled by the difference in peripheral speed in line speed, heat, pressurization, etc., with respect to continuous linear fibers after spinning, and the greater number of crimps per unit length of crimped fibers, the greater resistance to buckling of fibers under external pressure. The number of crimps is typically from 5 to 35 per inch, and preferably from 15 to 30 per inch. Modeling by heat retention, a three-dimensional crimping could be provided by using the difference in heat retention resulting from the difference in melting temperature by, for example, heating a fiber comprising two or more resins having different melting points. The cross-sectional shapes of the fibers include, for example, eccentric type, side-by-side type and sheath-core type conjugated fibers. Said fibers have a heat retention rate of typically 5 to 90%, and more preferably 10 to 80%.
[00088] As shown in Figures 1 to 3, the diaper 1 comprises a liquid impermeable cover sheet 6, type liquid impermeable water leak proof bracelets 7a, 7b, liquid impermeable leak proof sheet 8, elastic members 91, 92, 93, 94 etc., in addition to the front sheet 2, back sheet 3 and absorbent body 4. These members will be described below. < Cover Sheet >
[00089] As shown in Figures 1 to 3, the liquid impervious cover sheet 6 is provided on the side skin surface of the front sheet 2. As shown in Figs. 1 to 3, the opening 61 is formed in the center of the cover sheet 6, and a part of the front sheet 2 (a part of the matching region of the absorbent body 4) being exposed from the opening 61 of the cover sheet 6 to form the surface side of the diaper skin together with the cover sheet 6.
[00090] Cover sheet 6 is a liquid impermeable sheet, and a liquid impermeable sheet including, for example, a non-woven material that has been subjected to a waterproofing treatment (e.g., a non-woven material bonded per stitch, continuous filament nonwoven material, a hydroentangled nonwoven material etc.), a synthetic resin (e.g. polyethylene, polypropylene, polyethylene terephthalate resin etc.), and a sheet composed of a nonwoven material and a synthetic resin film etc. < Leak Proof Bracelets >
[00091] As shown in Figures 1 to 3, leak-proof bracelets (cuffs) 7a, 7b being formed from a liquid impermeable sheet provided on both sides of the opening 61 of the cover sheet 6. One end of each of the bracelets at the leak proof 7a, 7b is a fixed end which is held and fixed between the front sheet 2 and the cover sheet 6, and the other end being a free end which is exposed from the opening 61 of the cover sheet 6. free ends of the leak-proof bracelets (cuffs) 7a, 7b are provided with elastic members 71a, 71b extending in the vertical Y direction and the leak-proof bracelets 7a, 7b rising towards the wearer's skin. Leak Proof >
[00092] As shown in Figures 2 and 3, the liquid impermeable leakproof sheet 8 is provided between the backsheet 3 and the absorbent body 4. The leakproof sheet 8 is a liquid impermeable sheet, and a liquid impermeable including, for example, a non-woven material that has been subjected to a waterproof treatment (for example, a stitch-bonded non-woven material, continuous filament non-woven material, a hydro-entanglement non-woven material, etc. .), a synthetic resin (e.g. polyethylene, polypropylene, polyethylene terephthalate, etc.) film and a sheet composed of non-woven material and a film of synthetic resin, etc.
[00093] As shown in Figs. 1 to 3, elastic members 91, 92, 93 and 84 are provided between the backsheet 3 and the cover sheet 6 having an hourglass shape of substantially the same dimensions. Incidentally, a part of the elastic members 91, 92, 93 and 94 is omitted in Figure 1.
[00094] As shown in Figure 1, a waist fold is formed in the waist opening by force of elastic contraction of the elastic members 91, 92 and the leg folds (side leg braces) are formed in the leg openings by the force of contraction of elastic limbs 93, 94. Leg folds prevent liquid excrement from leaking out of leg openings.
[00095] For example, an elastic body in the form of a cord or thread having a thickness of approximately 470 to 940 dtex could be used as elastic members 93 and 94. A fibrous nonwoven material having elasticity could be used as elastic members 91, 92, 93 and 94.
[00096] As shown in Figs. 2 and 3, a plurality of elastic members 91, 92 are attached to the front section 11 and the rear section 13 so as to be contracted in a stretched state in the transverse direction X, and being spaced apart in the longitudinal direction Y. As shown in Figs. . 2 and 3, the elastic member 93 comprises portions 93a, 93b extending along both sides 121a, 121b of the intermediate section 12, and portion 93c extending in the transverse direction to connect the portions 93a, 93b together. As shown in Figs. 2 and 3, elastic member 94 comprises portions 94a, 94b extending along both sides 121a, 121b of intermediate section 12, and portion 94c extending in transverse direction X to connect portions 94a, 94b together. As the absorbent body 4 extends from the front section 11 to the rear section 13 through the intermediate section 12, the absorbent body 4 is pressed against the wearer's skin side by the contraction force of the elastic members 91, 92, 93 and 94, and thus preventing the user's liquid excrement from leaking out.
[00097] Diaper 1 is worn so that the front sheet 2 and cover sheet 6 are positioned on the inner side (side of the wearer's skin), and the back sheet 3 being positioned on the outer side (side of the wearer's garment). ). However, it will not be necessary for the user to wear the diaper. The user's liquid excrement enters the absorbent body 4 through the exposed front sheet 2 of the opening 61 of the cover sheet and is absorbed and retained by the absorbent body 4. The back sheet 3 and the leak-proof sheet 6 prevent leakage of the excrement. liquid absorbed and retained in the absorbent body 4 from leaking. The liquid excrement to be absorbed includes, for example, urine, menstrual blood, vaginal discharge, etc., and is usually primarily urine.
[00098] In diaper 1, various modifications are possible. Example of diaper modification 1 will be explained below. < Example of Modification A >
[00099] In the diaper modification example A, the front sheet 2 is joined with the absorbent core 41 together with the core wrap 42a by the compressed sections 5a, 5b. The front sheet 1 in modification example A is an example of a liquid permeable layer which is joined to the absorbent core by the seam sections. < Example of Modification B >
[000100] In the diaper modification example B, a second liquid permeable sheet is disposed between the front sheet 2 and the absorbent body 4. The second sheet may or may not be joined with the absorbent core 42a together with the core wrapper 42a . The second seat that is joined with the absorbent core by the seam section, and the second sheet that is not joined with the absorbent core is an example of a liquid permeable layer that is not joined with the absorbent core by the seam.
[000101] The second sheet is a liquid permeable sheet through which the user's liquid excreta can permeate, and including, for example, a non-woven material, a woven material, a synthetic resin film having formed liquid permeation holes therein, a sheet in the form of a net having a weft, etc., and the material, thickness, basis weight, density, etc., can be suitably adjusted to the extent that the user's liquid excrement can permeate through the second sheet.[ Method for Production of the Absorbent Article]
[000102] The method for producing the absorbent article of the present invention comprises a step of stacking an absorbent material comprising a hydrophilic fiber and a superabsorbent polymer at a predetermined mixing weight ratio in a region other than the region where the second region is not formed. , at a basis weight obtained by subtracting the basis weight of the second region absorbent material from the basis weight absorbent material of the first region, to form a first layer; a step of stacking an absorbent material comprising a hydrophilic fiber and a superabsorbent polymer with the superabsorbent polymer included in a mixing weight ratio of 10/100 to 47/100 in the entire region where the absorbent core is to be formed, in the material second region basis weight absorbent to form a second layer, and a step of forming the joint section within the second region with respect to a laminate comprising the first liquid permeable layer, the second layer and the first layer stacked in that order, or a laminate comprising the first liquid-permeable layer, the first and second layers stacked in that order, and the arrangement of the laminate having the junction section formed in a second region between the second liquid-permeable sheet and the water-impermeable layer. liquid..
[000103] The method of producing the absorbent article of the present invention is suitable for producing an absorbent article comprising an absorbent core having a high basis weight region (the first region), and a low basis weight region (the second region). ), where the ratio of the basis weight of the superabsorbent polymer to the basis weight absorbent material in the low basis weight region (the second region) is from 10/100 to 47/100,
[000104] When a laminate comprising the liquid-permeable layer, the second layer and the first layer stacked in that order, or a laminate comprising the liquid-permeable layer, the first layer and the second layer stacked in that order are formed, the permeable layer liquid can be stacked together with the first and second layers, or the first layer can be stacked after stacking together with the second layer and the liquid permeable layer. Furthermore, when the first and second layers are stacked together, the second layer may be formed by stacking an absorbent material on the first layer, and alternatively the first and second layers may be formed separately and then stacked together.
[000105] The laminate comprising the liquid-permeable layer, the second layer and the first layer stacked in that order may further have another liquid-permeable layer or a liquid-impermeable layer stacked on the side of the first layer. In this case, another liquid-permeable layer or a liquid-impermeable layer may be stacked on the first layer after stacking together with the first layer and the second layer (the second layer may or may not have a liquid-permeable layer stacked on it), or the second layer (the second layer may or may not have a liquid-permeable layer stacked thereon) being stackable on the first layer after stacking the first layer and the liquid-permeable layer or liquid-impermeable layer.
[000106] The laminate comprising the liquid-permeable layer, the first layer and the second layer stacked in that order may have yet another liquid-permeable layer or a liquid-permeable layer stacked on the side of the second layer. In this case, another liquid-permeable layer or the liquid-impermeable layer may be stacked on the second layer after stacking together with the first layer (the second layer may or may not have a liquid-permeable layer stacked on it) and the second layer, or the first layer (the first layer which may or may not have a liquid-permeable layer stacked thereon) may be stacked on the second layer after stacking the second layer and the liquid-permeable layer or the liquid-impermeable layer.
[000107] An embodiment of the method for producing the absorbent article of the present invention will be explained below, taking as an example a method for producing diaper 1, based on Figure 6.
[000108] The first step is a step of stacking an absorbent material comprising a superabsorbent polymer at a predetermined mixing weight ratio in the region other than the region where low basis weight regions (regions 411a, 411b) are formed, among the region where the absorbent core 41 is to be formed, at a basis weight obtained by subtracting the basis weight of the absorbent material from the low basis weight regions (regions 411a, 411b) of the basis weight absorbent material from the low basis weight region. high basis weight (region other than regions 411a, 411b), to form the first layer 410a.
[000109] As shown in Fig. 6, in forming the first layer 410a, a suction cylinder 100 which rotates in the driving direction MD, and an absorbent material feeding unit 120 comprising a cap covering the suction cylinder 110 are used.
[000110] The peripheral surface 111 of the suction cylinder 110 has recess portions 112 formed therein at a predetermined stretch in the circumferential direction as molds for filling an absorbent material. As the suction cylinder 110 rotates and the recess parts 112 enter the absorbent material supply unit 120, the suction unit 113 acts on the recess portions 112 and the absorbent material fed from the absorbent material supply unit 120 is sucked into the vacuum in the recess portions 112. The absorbent material that is fed from the absorbent material feed unit 120 comprises hydrophilic fibers F fed from the grinder (not shown) and the superabsorbent polymer particles F fed from the particle feed section 121 at a predetermined rate. weight mixing ratio. The weight blend ratio of the superabsorbent polymer to the absorbent material (hydrophilic fibers F + particles of superabsorbent polymer P) will preferably be from 33/100 to 66/100, and more preferably from 40/100 to 60/100,
[000111] The lower part of the recess parts 112 is in the form of a weft and being provided with a number of through holes. The suction unit 113 exerts a suction action against the recess parts 112 through these through holes. The recess portions 112 are provided with two non-breathable ridges extending in the longitudinal direction at a constant distance, and these non-breathable ridges being configured so that the suction action of the suction unit 113 does not act on these non-breathable ridges.
[000112] In this way, the first layer 410a is formed in the recess parts 112. The first layer 410a contains hydrophilic fibers F and superabsorbent polymer particles P in a mixed state. As shown in Fig. 5, the first layer 410a has cavities 4101, 4102 corresponding to two non-breathable protrusions, and the other part having a constant thickness.
[000113] The first layer 410a which is formed in the recess part 112 is transferred to the lower core shell 91 traveling in the direction of conduction MD by the action of the transfer suction unit 150. A hot melt adhesive has been applied to the surface top of the lower core shell 91 by the heat-melt adhesive. The lower core shell 91 into which the first layer has been transferred travels in the direction of conduction MD. [Second stage]
[000114] The second step is a step of stacking an absorbent material comprising a superabsorbent polymer in a mix weight ratio of 10/100 to 47/100 in the entire region where the absorbent core 41 is to be formed, in the absorbent material. basis weight of the low basis weight regions (regions 411a, 411b) to form a second layer 410b.
[000115] In forming the second layer 410b, the suction cylinder 210 which rotates in the driving direction MD, and the absorbent material feeding unit 220 comprising a cap covering the suction cylinder 210 are used.
[000116] The peripheral surface 211 of the suction cylinder 210 has recess portions 212 formed therein at a predetermined pitch in the circumferential direction as molds for filling an absorbent material. When the suction cylinder 210 rotates and the recess parts 212 enter the absorbent material supply unit 220, the suction unit 213 acts on the recess portions 212 and the absorbent material fed from the absorbent material supply unit 220 is sucked into the vacuum in the recess portions 212. The absorbent material that is fed from the absorbent material feed unit 220 comprises hydrophilic fibers F fed from the grinder (not shown) and the superabsorbent polymer particles P from the particle feed section 221 in a predetermined ratio. weight mix. The weight mixing ratio of the superabsorbent polymer to the absorbent material (hydrophilic fibers F + particles of superabsorbent polymer P) is preferably from 10/100 to 40/100, and more preferably from 12/100 to 35/100,
[000117] The lower part of the recess parts 212 is in the form of a weft and being provided with a number of through holes. The suction unit 213 exerts a suction action against the recess parts 212 through these through holes.
[000118] In this way, the second layer 410b is formed in the recessed parts 212. The second layer 410b contains hydrophilic fibers F and superabsorbent polymer particles P in a mixed state. As shown in Fig. 5, second layer 410b has a substantial constant thickness.
[000119] The second layer 410b which is formed in the recess part 212 is transferred to the lower core shell 91 traveling in the direction of conduction MD by the transfer action of the suction unit 160. The lower core shell 91 in which the first layer 410a and second layer 410b have been stacked in this order traveling in the direction of conduction MDm and then the upper core wrapper 92 is stacked on the second layer 410b. A heat-melt adhesive was applied to the lower surface of the upper core wrapper 92, and the second layer 410b being bonded to the upper core wrapper 92 by the heat-melt adhesive.
[000120] Thus, a continuous body of a laminate comprising the upper core wrapper 92, the second layer 410b, the first layer 410a and the lower core wrapper 91 stacked in this order is formed. This continuous body is cut into a predetermined shape by a pair of cylinders 300, 301 to form individual laminates comprising the core wrapper 42a, second layer 410b, first layer 410a and absorbent core 42b stacked in that order.
[000121] As shown in Fig. 5, the absorbent core 41 is comprised of the first layer 410a and the second layer 410b, and the absorbent core 41 being divided into regions 411a, 411b (corresponding to the "second region" in the absorbent article of the present invention) and the other area (corresponding to the "first region" in the absorbent article of the present invention, when the surface of the absorbent core 42 on the side of the core wrapper 41a is seen in plan view. Incidentally, the absorbent core 41 is divided on the side of the core shell 42b being seen in plan view.
[000122] The regions 411a, 411b are low basis weight regions having the basis weight of the absorbent material lower than that of the other region by the presence of cavities 4101, 4102 of the first layer 410a. [Third Stage]
[000123] The third step is a step of forming the compressed sections 5a, 5b within the low basis weight regions (regions 411a, 411b), with respect to a laminate comprising the core wrap 42a, the second layer 410b, the first layer 410a and the core wrapper 42b are stacked in this order. A pair of cylinders 303, 304 is used in forming the compressed sections 5a, 5b.
[000124] Cylinder 303 is an upper cylinder having raised portions (not shown) on the outer peripheral surface thereof, and cylinder 304 is a lower cylinder having a smooth outer peripheral surface. The projecting portions of the cylinder 303 are formed to match the shape, matching pattern etc. of the compressed sections 5a, 5b and the core wrap 42a and the absorbent core 41 being compressed in the thickness direction and being heated by these protruding parts. Consequently, the compressed sections 5a, 5b which integrate the core shell 42a and the absorbent core 41 in the thickness direction are formed as concave sections. The compressed sections 5a, 5b formed in this way are densified, and have a thickness less than that of the other sections and a density greater than that of the other sections.
[000125] Cylinders 303 and/or 304 may be heated to perform heating during compression. In the embossing treatment with cylinders 303, 304, the heating temperature is typically 80 to 140°C, and preferably 90 to 120°C, the linear pressure (the pressing force per unit width of the pressed part) is typically 10 to 200 N/mm, and preferably 40 to 100 N/m, and the processing speed being typically 10 to 500 m/min., and preferably 20 to 300 m/min.
[000126] In this way, the absorbent body 4 having the absorbent core 41 containing an absorbent material, core wraps 42a, 42b covering the absorbent core 41, and the compressed sections 5a, 5b integrating the absorbent core 41 and the core 42a in the thickness direction of the absorbent body is formed.[Other Steps]
[000127] The production of the diaper 1 using the absorbent body 4 may be carried out according to a conventional method. EXAMPLES[Examples 1 to 4 and Comparative Examples 1 to 6](1) Production of the Absorbent Core
[000128] A blend of cellulose pulp (Super Soft from International Paper Co.) and a superabsorbent polymer (UG860 from Sumitomo Seika Chemicals Co., Ltd.) (hereinafter referred to as “SAP”) was used as an absorbent material to produce an absorbent core having a structure shown in Figure 5. In Examples 1 to 4 and Comparative Examples 1 to 5, the size of the absorbent core was established as 400 mm long x 140 mm wide, the size of the low basis weight region being set to 220 mm long x 7 mm wide, the number of low basis weight regions being set to 2, and the distance between low basis weight regions (the distance between the center lines of the low basis weight regions base , extended in the longitudinal direction) being set to 50 mm. In Comparative Example 6, the size of the low basis weight region was changed to 220 mm long x 3 mm wide (other conditions being the same as in Examples 1 to 4 and Comparative Examples 1 to 5).
[000129] In producing the absorbent core, stacking an absorbent material in the region other than the two regions (each being 220 mm long x 7 mm wide in Examples 1 to 4 and Comparative Examples 1 to 5, and each being 220 long x 3 mm wide in Comparative Example 6) where the absorbent core is to be formed into a basis weight obtained by subtracting the basis weight (see Table 1) of the low basis weight region from the basis weight (see Table 1) from the high basis weight region to form a first layer (the first layer 410a in Fig. 5). In the first layer, the two regions where the low basis weight regions are to be formed are cavities (cavities 4101, 4102 in Fig. 5).
[000130] Then, an absorbent material is stacked in the entire region where the absorbent core is to be formed at a basis weight of the low basis weight region (see Table 1) to form the second layer (the second layer 410b in Fig. 5) on the first layer (the second layer 410b in Fig. 5) on the first layer.
[000131] The cellulose basis weight and SAP basis weight of the high basis weight regions and low basis weight regions in Examples 1 to 4 and Comparative Examples 1 to 5 are shown in Table 1.
(2) Production of the absorbent body
[000133] An absorbent core was disposed between two core wraps (hydrophilic SMS non-woven material having a basis weight of 10 g/m2 from CNC Co., Ltd.) which were coated with a hot melt adhesive (MQ633E from Henkel Corporation) (in a 5 g/m2 basis weight coating) anticipated, and the high basis weight region being compressed to a predetermined thickness (3 mm) with a pressing equipment (pressing under a load of 23 kN per 2 seconds). In thickness measurement, a thickness gauge having a sample (dial thickness gauge, large type, JB type, probe specification Φ50 mm, from Ozaki Seisakusho Co.) was used, and an average thickness value of ten pieces of sample (50 mm x 50 mm) was calculated.
[000134] Subsequently, the embossed parts were formed with an embossing pressing machine, the embossed part not being formed in Comparative Example 5. The embossed parts were formed in two low basis weight regions of the absorbent core. An embossing treatment was not formed in Comparative Example 5. An embossing treatment was performed using an embossing plate having protruding parts on it (heating temperature 90°C), and a flat plate on it (heating temperature 100°C). 90o C) as a bottom plate. The recording time was 3 seconds, and the recording pressure was 30 N/mm2. Embossed parts (200mm long x 3mm wide xs 0.3mm deep), extended in the longitudinal direction of the non-woven material when the upper non-woven material was viewed in the plan view, were formed by embossing treatment . Incidentally, the embossed portions were formed so that the centerlines thereof coincide with the centerlines of the low basis weight regions. (3) Measurement of the bending stiffness of the absorbent body
[000135] The absorbent body prepared in (2) has been cut along both sides of an embossed portion extending in the longitudinal direction of the absorbent body, and being cut perpendicular to the extended direction of the embossed portion, to prepare a piece sample 150 mm long x 20 mm wide. The sample length is the length in the direction that the sample is inserted into the chuck of the measuring device.
[000136] The sample piece under standard conditions (under an atmosphere of a temperature of 20°C and a humidity of 60%) was established in a measuring device (Large Pure Bending Tester KES-FB2-L from Kato Tech Co., Ltd.) and the flexural stiffness value B (gf-cm2/cm) according to the KES measurement being calculated.
[000137] The measurement parameters were established as follows:- Measurement mode: half-cycle- SENS: 2 x 1- Sample gripping distance: 2 cm- Maximum curvature: 0.5 cm-1- Number of repetition : 1- Bending stiffness value B (g-cm2/cm) is the slope at curvature K = 0.0 to 0.2.
[000138] The B value (g-cm2/cm) was measured five times, and an average value was determined. The higher value B, the higher bending stiffness.
[000139] (4) Measurement of the joint strength of the embossed part The absorbent body prepared in (2) was cut along both sides of an embossed part extending in the longitudinal direction of the absorbent body and being cut perpendicular to the direction extended from the embossed part to prepare a 200 mm long x 25 mm wide sample piece.
[000140] The sample piece under standard conditions (under an atmosphere of a temperature of 20o C and a humidity of 60%) was mounted on a table-top precision universal testing machine AGS-1kNG from Shimadzu Corporation) by attaching an absorbent core to a higher grip and securing the core wrap to a lower grip at a gripping distance of 25 mm. A load (maximum load) was applied to the sample at an elastic velocity of 200 mm/min. until the core wrap and the absorbent core are completely released apart from each other to measure the joint strength (N) of the embossed parts per 25 mm width of the sample piece when the longitudinal direction of the sample piece is taken with a elastic direction.
[000141] The measurement parameters were established as follows:- Load of cells used: 50 N- Distance between chucks: 25 mm- Test type: peeling- Test force polarity: Standard- Test force direction: up- Sampling duration time: 50 m sec.- First half of the exclusion range: 25 mm of displacement- Second half of the exclusion interval: 175 mm of displacement
[000142] The junction resistance (N/25 mm) was measured five times, and an average value was determined. (5) Measurement of artificial urine absorption time
[000143] The absorbent body prepared in (2) was placed on a horizontal surface, and a cylinder being placed in the central part of the absorbent body, A cylinder made of a clear plastic, having an inner diameter of 30 mm, an outer diameter of 35 mm, and an overall length of 230 mm was used as the cylinder. An iron sleeve having an inner diameter that is adapted to the outer diameter of the cylinder was used to adjust the weight to 325 g.
[000144] The tip of the cruet was fixed in a position 10 mm below the top end of the top end of the cylinder.
[000145] Forty millimeters of an artificial urine was dripped at a drip rate (the first time), and the time from the initiation of the drip to the artificial urine in the cylinder being consumed was measured. Artificial urine was prepared by adding 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate heptahydrate, 3 g of calcium chloride dihydrate, and 1 g of dry Blue No. 1, for 10 kg of ion-exchanged water, and shaking well.
[000146] After 5 minutes from the initiation of the first drip, 40 mL of artificial urine was dripped (second time) at a drip rate of 8 mL/sec., and the time from the initiation of the second drip to the artificial urine in the cylinder being consumed was measured.
[000147] After 10 minutes from the initiation of the first drip, 40 mL of artificial urine was dripped (third time) at a drip rate of 8 mL/sec., and the time from the initiation of the third drip to the artificial urine in the cylinder being consumed was measured.
[000148] After 15 minutes of initiating the first drip, 40 mL of artificial urine was dripped (fourth time) at a drip rate of 8 mL/sec. and the time from initiation of the fourth drip to the artificial urine in the cylinder being consumed was measured. Each sample was measured for n = 3 times to obtain a principal value. (6) Result
[000149] The results will be shown in Table 2.[ Table 2]

[000150] In view of the durability, texture, performance and others required in the products, the following criteria have been established.[Criterion 1] The embossed part has a joint strength of 0.85 N/25 mm or more.[Criterion 2] The embossed part has a bending stiffness of 9 gf-cm2/cm or less as determined in the KES measurement. [Criterion 3] The absorption time in the third and fourth drops is 140 seconds or less in the third and four drips when repeating a 40 mL drip of an artificial urine four times at a drip rate of 8 mL/sec. and 5 minutes apart.Examples 1 to 4 met the criteria. However, Comparative Examples 1 to 5 did not satisfy one or more of the criteria.[Explanation of Symbols]1 Disposable diaper (absorbent article)2 Front sheet (liquid permeable layer that is not joined to an absorbent core by a seam section3 Back sheet (liquid impermeable layer) 4 Absorbent body41 Absorbent core42a Core wrap (liquid permeable layer that is joined to the absorbent core by a junction section)411a Low basis weight region (the second region having a low weight absorbent material of lower basis weight than that of the first region) 411b Low basis weight region (the second region having an absorbent material of lower basis weight than that of the first region)

权利要求:
Claims (6)
[0001]
1. "ABSORBENT ARTICLE", comprising a liquid-permeable layer (42a), a liquid-impermeable layer (3), an absorbent core disposed between the liquid-permeable layer and the liquid-impermeable layer, a junction section (5a, 5b) joining the first liquid permeable layer and the absorbent core wherein the absorbent core comprises as the absorbent material a hydrophilic fiber and a superabsorbent polymer, wherein the absorbent core has a first region having a predetermined basis weight absorbent material and a second region (411a, 411b) having a predetermined basis weight absorbent material that is less than that of the first region, where the ratio of the basis weight of the superabsorbent polymer to the basis weight of the absorbent material is from 10/100 to 47/100 where the junction section, which is a compressed section that integrates the liquid-permeable layer with the absorbent core in one thickness direction, is formed within the second region characterized by the ra The ratio of the basis weight of the superabsorbent polymer to the basis weight of the absorbent material in the second region is 23/100 to 92/100 times the basis weight of the superabsorbent polymer to the basis weight of the absorbent material in the first region region.
[0002]
2. "Absorbent article", according to claim 1, characterized in that it has a longitudinal direction and a transverse direction, and the second region has two regions extending in the longitudinal direction of the absorbent article and the junction section is formed inside each one of the two regions.
[0003]
3. "ABSORBENT ARTICLE", according to any one of the preceding claims, characterized in that the second basis weight of the absorbent material is from 34/100 to 73/100 times the basis weight of the absorbent material of the first region.
[0004]
An "absorbent article" according to any one of the preceding claims, characterized in that the first liquid permeable layer is a core wrap covering the absorbent core.
[0005]
5. - "ABSORBENT ARTICLE", according to any one of the preceding claims, characterized in that the joint section is a compressed section that integrates the first liquid-permeable layer with the absorbent core in a thickness direction.
[0006]
6. - "METHOD FOR PRODUCTION OF THE ABSORBENT ARTICLE", according to claim 1, characterized in that it comprises the steps of stacking an absorbent material comprising a superabsorbent polymer at a predetermined weight mixing ratio, in the region other than the region where the second region is to be formed, between the region where the absorbent core is to be formed, at a basis weight obtained by subtracting the basis weight of the absorbent material of the second region from the basis weight of the absorbent material of the first region to forming a first layer, stacking an absorbent material comprising a superabsorbent polymer in a mix weight ratio of 10/100 to 47/100 in the entire region where the absorbent core is to be formed, on the basis weight of the absorbent material of the second region, to form a second layer, and forming a seam section within the second region with respect to a laminate comprising the liquid-permeable layer, the second layer and the first layer stacked in that order, or a laminate comprising the liquid permeable layer, the first layer and the second layer stacked in that order.

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同族专利:

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公开号 | 公开日

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CN105073078A|2015-11-18|

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AU2014208105B2|2016-09-15|

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WO2014112590A1|2014-07-24|

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MY160984A|2017-03-31|

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EP2946755A1|2015-11-25|

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US20150359687A1|2015-12-17|

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KR102003105B1|2019-07-23|

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SA515360792B1|2017-12-31|

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JP5936560B2|2016-06-22|

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EP2946755B1|2018-03-28|

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EP2946755A4|2016-01-20|

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US9675502B2|2017-06-13|

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JP2014136126A|2014-07-28|

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CN105073078B|2019-06-28|

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KR20150107768A|2015-09-23|

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AU2014208105A1|2015-08-06|

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BR112015016449A2|2017-07-11|

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法律状态:
2018-11-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-01-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-08-03| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-11-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2022-01-11| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/01/2014, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2013007732A|JP5936560B2|2013-01-18|2013-01-18|Absorbent articles|

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JP2013-007732|2013-01-18|

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PCT/JP2014/050822|WO2014112590A1|2013-01-18|2014-01-17|Absorbent article|

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