• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a dispersible nonwoven comprising pulp and solvent-spun cellulosic fibers, characterized in that the solvent-spun cellulosic fibers are fibrillated. Furthermore, the invention relates to the use of dispersible nonwovens in wet wipes and dry wipes.
    公开号:AT512460A1
    申请号:T1658/2011
    申请日:2011-11-09
    公开日:2013-08-15
    发明作者:
    申请人:Chemiefaser Lenzing Ag；
    IPC主号:
    专利说明:

    PL0513 -1- * ·· · · · · * · · ·
    • * * ·· «« I I · I • · > · I t «I« · ·
    Dispersible nonwoven
    The invention relates to absorbent dispersible nonwovens and to methods of making and using such products. More particularly, the invention relates to decomposable wet wipes which are rinsable in standard toilets and readily disintegrate into dispersible particles that are biodegradable upon disposal.
    Non-woven textiles are referred to as nonwovens. The definition of nonwovens can be found in the standard ISO 9092: 1988. Absorbent nonwovens include dry wipes, wipes, facial tissues and face masks. In addition, there are materials that are used in diapers, sanitary napkins and incontinence products. The nonwovens used in these applications must meet the requirements of the European Pharmacopoeia.
    Disposable absorbent wipes, such as moist toilet paper, offer a high level of comfort, comfort and effectiveness and are well received by the consumer. However, the popularity of these products has created a need for their disposal. Common disposal methods for waste, such as waste bins for subsequent combustion or landfill, are inconvenient for the consumer, especially with regard to wet toilet tissues. An alternative disposal is to flush down the wet wipes in conventional toilets. Flushing down, crushing by mechanical forces and subsequent biodegradation in the sewage system is more convenient and discrete for the consumer. For this disposal method, the appropriate material in use should maintain dimensional stability and strength, but disintegrate rapidly when flushed down the toilet without causing blockages in the pumps and duct systems.
    Products such as toilet tissues are towels that have been pre-moistened. Therefore, nonwovens for such wet storage applications should maintain mechanical stability and strength, but then be biodegradable in the sewage system.
    Washable wet wipes are known for example from US 5,629,081 and EP 1 285 985 A1.
    The object of the invention is to provide a dispersible nonwoven with a high strength, which decomposes rapidly when flushed down.
    REPLACED -2- PL0513
    The invention provides a dispersible nonwoven which contains pulp and a solvent spun cellulosic fiber and is characterized in that the solvent spun cellulosic fibers are fibrillated.
    Solvent-spun cellulosic short cut fibers having a length of 2 to 20 mm, preferably 3 to 12 mm, particularly preferably 4 to 10 mm, are particularly suitable as starting material for the fibrillated fibers. The titer of the solution-spun cellulosic short cut fibers is from 0.9 to 6.7 dtex, preferably from 1.3 to 1.7 dtex.
    The proportion of solvent-spun cellulosic short cut fibers in the dispersible nonwoven preferably ranges from 1 to 90% by weight, preferably from 5 to 40% by weight, particularly preferably from 10 to 30% by weight, based on the nonwoven.
    A preferred solvent spun cellulosic short cut fiber is a lyocell fiber made by the amine oxide process known from US 4,246,221 (McCorsley). A suitable solvent-spun cellulosic fiber is sold under the trade name "Tencel". available.
    The dispersible nonwoven has a weight of 30 to 100 g / m 2, preferably 40 to 60 g / m 2 and a thickness of 0.1 to 0.7 mm.
    The dispersible nonwoven may be a dispersing aid in an amount of 0.1 to 1%
    % By weight, preferably from 0.5 to 1% by weight, based on the nonwoven.
    To increase the strength, optionally, a binder in an amount of 0.01 to 5%
    % By weight, preferably from 0.1 to 0.5% by weight, based on the nonwoven. Preference is given to acrylic resins or epichlorohydrin-based resins, such as polyamide-polyamine-epichlorohydrin resins. Further examples of suitable binders are polyethyleneimine resins or amino resins.
    As pulp, all types of pulp are suitable, especially softwood and hardwood pulps, and pulps from plants such as abaca or bamboo.
    The dispersible nonwoven fabric of the present invention has a machine direction wet strength of 2 to 20 N / 5cm, preferably 3 to 13 N / 5cm, and especially
    POSSIBLE P LOS 13 -3- ··· * · * »·« · · · * «······································· preferred from 3 to 7 N / 5 cm in relation to a weight per unit area from 60 g / m 2 and in the transverse direction from 1 to 10 N / 5 cm, preferably from 1 to 7 N / 5 cm and more preferably from 1 to 3 N / 5 cm. Wet strength was determined according to EDANA Method 110.4 (09) " Standard Test Method for Breaking Force & Elongation of Nonwoven Materials (Strip Method) ".
    A standardized test method for testing the properties of disposable wipes is known from the document EDANA Guidance Document for Assessing the Flushability of Nonwoven Consumer Products. This test method is used to estimate the degradability of rinse-away products during their transport through household and community piping systems (e.g., sewage pipes, pumps and lifting equipment). In this test method, the rate and level of decomposition of the test material is determined by turbulent flowing water in a rotating tube. The results are used to assess the compatibility of the material in household and community management systems. The principle of the test procedure is that the rotation of the tube is used to simulate the forces necessary for decomposition. For testing, the material is placed in a clear plastic tube containing 700 ml of drinking water or waste water, the tube being turned upside down. After a predetermined number of revolutions, the contents are passed through a series of sieves. The various size fractions remaining on the sieves are weighed and their proportion and size of decomposition determined.
    The test material is decomposable if at least 95% of the size fractions pass through a 12 mm sieve and the residue is less than 5%.
    The invention further relates to a process for the preparation of a dispersible nonwovens. According to this wet laying process, pulp is dispersed in water, as is the solvent spun cellulosic fiber. This can be done individually or in the mix. A dispersing aid such as CMC (carboxymethyl cellulose) may be added to improve the dispersion quality. The dispersions are either milled separately or as a mixture through a refiner. The Mahienergie is from 20 to 400kWh / t, preferably from 40 to 150kWh / t. A binder solution may be added to the fiber suspension as needed. In the case of separate grinding, the slurries are mixed homogeneously with each other. The slurry is then, e.g. on a paper machine, wet-laid into a sheet.
    POSSIBLE -4- PL0513
    The sheet is then processed to a nonwoven by a water jet bonding process, either in the same production line or as a separate process step.
    Fig. 1 shows unfibrillated tenc fibers (light microscope). Fibrillation 5 is a wet scrubbing process which exposes fibrils from the surface of filaments. As the grinding progresses, more and more fibrils are detached from the filaments and the diameter of the filaments decreases (FIG. 2: light microscope, FIG. 3: scanning electron microscopy). 10 In further process steps, the sheet is cut to the appropriate size, folded and packaged.
    Before packaging, a treatment, e.g. an impregnation by means of a liquid or a lotion takes place. 15
    The invention is further illustrated by the following examples:
    Example 1 and Example 2 (both Veroleichsbeispielel
    Nonwoven fabric made by the "wetlaid" process of pulp (Canfor pulp, a 20 long fiber pulp of spruce and pine from British Columbia, Canada) and 15% Tencel short cut fibers 1.7 dtex with 6 mm cut length (Example 1) and 25%, respectively Tencel short cut fibers 1.7 dtex with 6 mm cut length (Example 2) without refining and addition of additives show very good dispersibility according to the test "Tier 1 Test - FG 511.2-Dispersibility Tipping Tube Test of the" EDANA Guidance Document for Assessing the 25 Flushability of Nonwoven Consumer Products ". According to the example 1,100% of the decomposed size fractions pass through the 12 mm, the 6 mm and even the 3 mm sieve. The 1.5 mm sieve holds 21% and 79% goes through. However, both nonwovens do not have high mechanical strengths, either in the machine direction or in the direction shown in Table 1.
    POSSIBLE PL0513 -5-
    • · · * • * * I
    Table 1
    Example fiber blend basis weight [E / m2] nonwoven thickness dry [mm] wet strength [N / 5cm] wet elongation [%] decomposability of the samples weight of each fraction in% based on the dry mass MD CD MD CD> 12 mm> 6 mm> 3 mm > 1.5 mm <1.5 mm 1 15% Tencel 85% Canfor Pulp 60 0.65 2.0 0.9 22 8 0 0 0 21 79 2 25% Tencel 75% Canfor Pulp 57 0.60 1.9 1.2 2.4 5 0 0 0 28 72
    Examples 3, 4 and 5 5
    Blends of pulp (Canfor pulp) and 25% Tencel short cut fibers 1.7 dtex and 6 mm cut length with addition of 0.5% CMC as dispersing aid. In these experiments, the pulp / Tencel mixture was milled successively 1 x through a disc refiner and 4 x through a conical refiner at an energy input of 40 kWh / t and 60 kWh / t 10. 1% of acrylic resin based on the dry weight of the fibers became
    Slurry added. The dispersibility of the nonwovens showed good results and the nonwoven strengths were also increased (Table 2).
    Example 6 15 nonwovens of a blend of 80% pulp (Canfor pulp) and 20% Tencel short cut fibers 1.7 dtex with 6 mm cut length were made by the wet laid process. The fibers were ground at an energy input of 100 kWh / t and then 1% CMC as a dispersing aid (based on the dry weight of the fibers) and 0.5% epichlorohydrin (based on the dry weight of the fibers) was added to increase the wet strength of the nonwoven (Table 2). The nonwoven showed good dispersible properties.
    Table 2
    Example Fiber Blend Refining (kWh / t) Basis Weight [g / m2] Nonwoven Thickness dry [mm] Wet Strength [N / 5cm] Wet Elongation [%] Disintegratability of Samples Weight of each fraction in% based on dry mass MD CD MD CD> 12mm &gt; 6 mm> 3 mm> 1.5 mm <1.5 mm 3 25% Tencel 75% Canfor Pulp, 40 59 0.28 3.6 1.3 4.2 39 0 0 0 55 45
    POSSIBLE PL0513 -6- 4 25% Tencel 75% Canfor Pulp 60 56 0.25 3.3 1.5 5.0 33 0 0 0 53 47 5 25% Tencel 75% Canfor Pulp + 1% Acrylic Haiz 60 60 0.32 3.4 1.5 1.3 6.6 0 0 0 78 22 6 20% Tencel 80% Canfor Pulp + 0.5% Epichlorohydrin 100 57 0.23 5.4 2.1 2.8 17 0 11 34 29 26
    Examples 7, 8, 9 and 10
    Nonwovens made from a blend of 75% pulp (Canfor pulp) and 25% Tencel-5 short cut fibers 1.7 dtex with 6 mm cut length were made by the wet-laid method. The fibers were first ground with an energy input of 80 kWh / t and then 1% CMC as a dispersing aid (based on the dry weight of the fibers) and 0.05%, 0.10%, 0.15% and 0.20% epichlorohydrin (based on the dry weight of the fibers) to increase the wet strength of nonwovens 10 (Table 2). According to the results in Table 3, all samples show good dispersibility.
    The nonwoven products of the present invention may be used in dry and wet wipes, e.g. Toilet, facial, cosmetic, baby and sanitary napkins for cleaning and sanitizing, as well as in absorbent sanitary products, such as e.g. Diapers, bandages and incontinence products are used.
    Table 3
    Example (Ex.) Fiber blend Reiining (kWh / t) Basis weight [gto2] Fleece thickness dry [mm] Wet strength [N / 5cm] Wet elongation [%] Disintegratability of the samples Weight of each fraction in% based on dry weight MD CD MD CD> I2mm > 6mm> 3mm> 1.5mm <1.5mm 7 25% Tencel 75% Canfor Pulp + 0.05% Epichlorohydrin SO 58 0.59 3.7 1.6 11 50 0 0 1 64 35 8 As Example 7 except with 0.10% Epichlorohydrin 80 60 0.53 4.1 1.9 11 50 0 0 4 63 33
    REPLACEMENT PL0513 -7- 9 Same as Ex. 7 except with 0.15% Epichlorohydrin 80 50 0.29 6.5 2.6 2.9 10 0 27 31 16 26 10 As Ex. 7 except with 0.20% Epichlorohydrin 80 59 0.42 5.5 2.2 8.8 28 0 2 30 36 32 later
    权利要求:
    Claims (19)
    [1]
    Claims 1. A dispersible nonwoven containing pulp and solvent-spun cellulosic fibers, characterized in that the solvent-spun cellulosic fibers are fibrillated.
    [2]
    2. Dispersible nonwoven fabric according to claim 1, characterized in that the proportion of fibrillated iösungsmittelsponnenen cellulosic fibers of 1 to 90% by weight, preferably from 5 to 40% by weight, particularly preferably 10-30 10% by weight based on the nonwoven is.
    [3]
    3. A dispersible nonwoven according to claim 1 and 2, characterized in that the solvent-spun cellulosic fibers are lyocell fibers.
    [4]
    4. A dispersible nonwoven according to any one of the preceding claims, characterized in that the nonwoven has a weight of 30 to 100 g / m2, preferably 40 to 60 g / m2 and a thickness of 0.1 to 0.7 mm.
    [5]
    5. Dispersible nonwoven according to one of the preceding claims, characterized in that the nonwoven contains a dispersing aid in an amount of 0.1 to 1% by weight, preferably from 0.5 to 1% by weight, based on the nonwoven ,
    [6]
    6. A dispersible nonwoven according to any one of the preceding claims, characterized in that the nonwoven a binder in an amount of 0.01 to 5% by weight, preferably from 0.1 to 0.5% by weight, based on the nonwoven , contains. 30
    [7]
    7. Dispersible nonwoven according to one of the preceding claims, characterized in that the binders are acrylic resins or epichlorohydrin-based resins.
    [8]
    8. A dispersible nonwoven fabric according to any one of the preceding claims, characterized in that the pulp is a softwood, a hardwood pulp, or a pulp of plants such as abaca or bamboo. REPLACED 35 PL0513 «· -9-
    [9]
    9. A dispersible nonwoven according to any one of the preceding claims, characterized in that the nonwoven is impregnated with a liquid or a lotion.
    [10]
    10. A dispersible nonwoven according to any one of the preceding claims, characterized in that the wet strength in the machine direction of 2 to 20 N / 5cm, preferably from 3 to 13 N / 5cm and more preferably from 3 to 7 N / 5cm based on a basis weight of 60 g / m 2 and in the transverse direction from 1 to 10 N / 5 cm, preferably from 1 to 7 N / 5 cm and particularly preferably from 1 to 3 N / 5 cm
    [11]
    11. A dispersible nonwoven fabric according to any one of the preceding claims, characterized in that the nonwoven fabric is dispersible according to the test "Tier 1 Test - FG 511.2 Dispersibility Tipping Tube Test of the EDANA Guidance Document for Assessing the Flushability of Nonwoven Consumer Products" At least 95% of the size fractions pass through a 12 mm sieve.
    [12]
    12. A process for preparing a dispersible nonwoven according to any one of the preceding claims comprising the steps of a) providing an aqueous dispersion of pulp and a dispersion of a solvent-spun cellulosic fiber in water, either singly or in the mixture. b1) grinding of the individual dispersions b2) milling together c) sheet formation by wet laying d) hydroentanglement to a nonwoven
    [13]
    13. The method according to claim 12, characterized in that the fiber suspension in step a) a dispersion aid is added.
    [14]
    14. The method according to claim 12 or 13, characterized in that the fiber suspension in step b1 or b2, a binder solution is added.
    [15]
    15. The method according to any one of claims 12 to 14, characterized in that the grinding energy of 20 to 400kWh / t, preferably from 40 to 150 kWh / t. POSSIBLE - 10- PL0513 * «···» · «» · f f «·» «9 · 9 ι · · · 9 *« 4 $ ψ Φ 9 φ #
    [16]
    16. The method according to any one of claims 12 to 15, characterized in that the solvent-spun cellulosic short cut fibers have a length of 2 to 20 mm, preferably 3 to 12 mm, more preferably 4 to 10 mm and a titer of 0.9 to 6.7 dtex , preferably from 1.3 to 1.7 dtex. 5
    [17]
    17. The method according to any one of claims 12 to 16, characterized in that the nonwoven is cut, folded and packaged.
    [18]
    18. The method according to any one of claims 12 to 17, characterized in that the 10 nonwoven is treated prior to packaging with a liquid or lotion.
    [19]
    19. Use of a nonwoven according to one of the preceding claims in dry wipes, wet wipes, facial tissues and facial masks as well as in absorbent hygiene products, such as diapers, sanitary napkins and incontinence products. 15 20 REPLACEMENT PL0513 ... 1/1 Fig. 1



    Fig.2

    Fig. 3

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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA1658/2011A|AT512460B1|2011-11-09|2011-11-09|Dispersible non-woven textiles|ATA1658/2011A| AT512460B1|2011-11-09|2011-11-09|Dispersible non-woven textiles|
    CN201280055420.9A| CN104024509B|2011-11-09|2012-10-11|dispersible non-woven fibre|
    JP2014540269A| JP2015501885A|2011-11-09|2012-10-11|Dispersible nonwoven fabric|
    KR1020147015621A| KR101904528B1|2011-11-09|2012-10-11|Dispersible non-woven fabrics|
    TR2019/00683T| TR201900683T4|2011-11-09|2012-10-11|Dispersible nonwovens.|
    PCT/AT2012/000259| WO2013067557A1|2011-11-09|2012-10-11|Dispersible non-woven fabrics|
    ES12795320T| ES2716824T3|2011-11-09|2012-10-11|Non-woven dispersible fabrics|
    EP12795320.6A| EP2776616B1|2011-11-09|2012-10-11|Dispersible non-woven fabrics|
    US14/356,519| US20150247288A2|2011-11-09|2014-05-06|Dispersible non-woven fabrics|
    US15/348,019| US9873964B2|2011-11-09|2016-11-10|Dispersible non-woven fabrics|
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