Crimped multicomponent fibers and methods of making same

A technology of multi-component fibers and manufacturing methods, applied in fiber processing, melt spinning, non-woven fabrics, etc., can solve the problems of increasing basic investment production costs, bulkiness, basis weight and overall uniformity fluctuations

Inactive Publication Date: 2002-01-16
FIBERTEX PERSONAL CARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Utilization of heating, such as hot air, requires continuous heating of the fluid medium, thus increasing capital investment and overall production costs
In addition, fluctuations in process conditions and equipment associated with high-temperature processes can also cause fluctuations in bulk, basis weight, and overall uniformity

Method used

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  • Crimped multicomponent fibers and methods of making same
  • Crimped multicomponent fibers and methods of making same
  • Crimped multicomponent fibers and methods of making same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0061] Example 1: Component 1 comprises a conventional propylene polymer (sold by Exxon Chemical Company under the trade name ESCORENE and the designation Exxon-3445, which has an MFR equal to 35, a polydispersity index of 3 and a density equal to 0.9 g / cm 3 , flexural modulus 220,000 psi, yield tension 5000 psi) and 2 wt% titanium dioxide. The second component comprises a metallocene catalyzed propylene polymer (sold by Exxon Chemical Company under the trade name ACHIEVE and the designation Exxon-3854, which has a melt flow index equal to 25 and a polydispersity index of 2). The formed spunbond web contains helically crimped fibers.

example 2

[0062] Example 2: The 1st component contained a conventional propylene polymer as in Example 1 and 2 wt% titanium dioxide. The second component comprises an amorphous propylene / ethylene copolymer (sold by the company Huntsman under the trade name REXFLEX FLEXIBLE POLYOLEFINS and designation W201, MFR equal to 19, tensile modulus 6, density 0.88 g / cm 3 ). The formed spunbond web contains helically crimped fibers with excellent "stretch and recover" properties.

example 3

[0063] Example 3: The 1st component contains the conventional propylene polymer as in Example 1 and 2 wt% titanium dioxide. The second component comprises an amorphous propylene homopolymer (sold by the company Huntsman under the trade name REXFLEXFLEXIBLE POLYOLEFINS and designation W104, MFR equal to 30, tensile modulus 14, density 0.88 g / cm 3 ). The formed spunbond web contains helically crimped fibers with excellent elongation and recovery properties.

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Abstract

The present invention provides continuously crimped propylene polymer nonwoven fabrics as well as processes for forming crimped multicomponent propylene polymer fibers by melt-attenuating extruded multicomponent fibers with heated or unheated air wherein the fibers spontaneously crimp without the need for additional heating and/or stretching steps.

Description

[0001] This invention relates generally to crimped multicomponent nonwoven fabrics and methods of making them. Background of the Invention [0002] Nonwoven webs composed of continuous thermoplastic polymer fibers produced by melt spinning of thermoplastic polymers are known in the art. As examples, meltspun and spunbond webs are described in US Patent 4,692,618 to Dorschner et al; US Patent 4,340,563 to Appel et al; and US Patent 3,802,817 to Matsuki et al. In addition, multicomponent spunbond fibers have also been developed before. The term "multicomponent" refers to a fiber that is spun together from at least 2 polymer streams to form a fiber(s). Multicomponent fibers comprise fibers (each) of two or more components arranged in substantially fixed, mutually distinct zones along the cross-section of the fiber, and as such continuously along the entire length of the fiber extend. Multicomponent fibers and methods of making them are known in the art and are generally descri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02J1/20D01D5/08D01F8/06D04H3/007D04H3/147D04H3/16
CPCD01F8/06D04H3/16D01D5/22D04H3/007D04H3/147
Inventor J·R·尼利D·F·克拉克T·J·斯托克斯C·M·弗雷泽R·W·格里芬
Owner FIBERTEX PERSONAL CARE
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