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Cellulose-binding fibres

A fiber and fiber material technology, applied in the field of dry-laid non-woven fabric materials, can solve the problems of hair loss and unsatisfactory performance of non-woven fabrics.

Inactive Publication Date: 2000-07-05
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, problems with linting occur during the manufacturing process and the performance of the nonwovens is not satisfactory because a large proportion of the natural fibers are not bonded to any synthetic fibers or, conversely, do not rely on the synthetic fibers to bond themselves. The combined structure is maintained in a certain position

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Different polyolefin bicomponent fibers were tested to evaluate their bondability to cellulose pulp fibers.

[0036] The cellulose fiber was NB 416 supplied by Weyerhauser. The weight ratio between bicomponent fibers and cellulose fibers was 25:75.

[0037] The composition of the bicomponent fibers tested was as follows,

[0038] Fiber No. 1 is according to the invention:

[0039] 1: Core: Polypropylene; Sheath: 10% grafted LLDPE (5% maleic acid grafted onto 95% LLDPE), 90% LLDPE.

[0040] 2. Contrast fiber; Core: Polypropylene; Sheath: 100% LLDPE.

[0041] 3. AL-Special-C supplied by Danaklon A / S; polypropylene core, HDPE skin.

[0042] 4. Hercules 449, provided by Hercules Company, length 5 mm, denier 1.5 decitex; polypropylene core / polyethylene skin.

[0043] Bicomponent fibers 1, 2 and 3 were all: titer 1.7 dtex, length 6 mm, core-to-sheath weight ratio 35:65.

[0044] The fibers were run at a very low speed, 8.33 m / min, on airlaid equipment (Dan-Web, Denmark)...

Embodiment 2

[0076] The bonding ability of two different fibers to cellulose fibers was tested on an industrial scale airlaid production line. Prepared fabric unit weight about 80g / m 2 , Air-laid non-woven fabric with a thickness of about 1mm. The nonwoven comprises 25 wt% bicomponent fibers and 75 wt% cellulose pulp fibers. The bicomponent fibers tested had a denier of 1.7 decitex and a length of 6 mm. In addition to the aforementioned (comparative) Fiber 3, a bicomponent fiber (called No. 5) was tested which had the same additive for binding cellulose as Fiber 1, but with a higher melting polyethylene sheath component points (HDPE). The fibers thus produced have the following composition:

[0077] 5: Core: Polypropylene; Sheath: 10% grafted LLDPE (5% maleic acid grafted onto 95% LLDPE), 90% HDPE.

[0078] Individual nonwoven samples were bonded at various temperatures at intervals of 3°C in order to determine the optimum bonding temperature for each fiber.

[0079] It was found tha...

Embodiment 3

[0088] The purpose of this experiment was to demonstrate the effect of varying the content of additives (maleic acid grafted onto LLDPE, 5% active) in the hide component.

[0089] The bicomponent fibers tested were all of a denier of 1.7 decitex and a length of 6 mm. The core-to-sheath weight ratio was 35:65 for fibers 6-9 and 50:50 for fiber 10. The core in all cases is polypropylene. The nonwovens are produced on an industrial scale airlaid line using the technology of the company Dan-Web (Denmark) with a nonwoven basis weight of about 80 g / m 2 , its thickness is about 1mm, and the weight ratio of bicomponent fibers to cellulose fibers is 25:75. Samples containing each bicomponent fiber were tested at three different bonding temperatures - 137, 140 and 143°C.

[0090] The sheath component composition of each fiber is as follows:

[0091] 6: 5% grafted LLDPE (5% maleic acid grafted onto 95% LLDPE), 95% LLDPE.

[0092] 7: 5% grafted LLDPE (5% maleic acid grafted onto 95% ...

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Abstract

The invention relates to drylaid nonwoven materials comprising bicomponent fibres comprising a low melting polyolefin component and a high melting polyolefin component, the low melting polyolefin component constituting at least a part of the surface of the fibre and comprising a non-grafted polyolefin component and a grafted polyolefin component, wherein the grafted polyolefin component has been grafted with an unsaturated dicarboxylic acid or an anhydride thereof, e.g. with maleic acid or maleic anhydride. The bicomponent fibres fibres have an excellent bonding affinity for natural fibres such as cellulose pulp fibres and allow the production of airlaid nonwovens with reduced generation of dust during the production process and with improved nonwoven strength properties.

Description

technical field [0001] The present invention relates to a dry-laid nonwoven material comprising polyolefin bicomponent fibers having excellent bonding affinity for natural fibers such as cellulosic fibers. Background of the invention [0002] Absorbent personal hygiene articles, such as disposable diapers, comprising, in addition to a permeable facesheet, an impermeable backsheet and one or more liquid distribution layers, an absorbent core usually comprising fibers such as cellulose fluff pulp natural fibers, synthetic fibers based on e.g. polyolefins and / or polyesters, and superabsorbent polymer (SAP) materials. In absorbent cores of this type, synthetic fibers, usually bicomponent fibers such as polypropylene / polyethylene or polyester / polyethylene, are thermally bonded to each other to form the support network of the absorbent core. Ideally, the synthetic fibers should be able to bond not only to each other, but also to natural fibers and SAP in order to form a core stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/06D04H1/42D04H1/54D04H1/541D04H1/544D04H1/732
CPCD04H1/54D04H1/42D04H1/544D04H1/732D04H1/541D01F8/06D04H1/425D04H1/4258D04H1/4291D04H1/43828D04H1/43835D04H1/5414D04H1/5412
Inventor P·H·汉森A·M·拉尔森
Owner FIBERVISIONS VARDE
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