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Nonwoven elastic fibrous webs and methods for making them

A fibrous web, elastic fiber technology, applied in fiber processing, textile and papermaking, fiber chemical characterization, etc., can solve problems such as unsatisfactory opportunities

Inactive Publication Date: 2006-12-20
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] While existing data can meet some needs, many opportunities remain unsatisfactory
Overall, existing efforts have not yielded fibrous webs with a sufficient combination of properties including stretchability, elasticity, bonding ability, and strength to meet the many perceived opportunities

Method used

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  • Nonwoven elastic fibrous webs and methods for making them
  • Nonwoven elastic fibrous webs and methods for making them
  • Nonwoven elastic fibrous webs and methods for making them

Examples

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Embodiment Construction

[0020] figure 1 An illustrative apparatus that can be used to prepare the nonwoven fibrous web of the present invention is shown. The fiber-forming material is fed to extrusion head 10 in this particular illustrative apparatus by introducing the fiber-forming material into feeder 11; melting the material in extruder 12; The molten material is pumped into extrusion head 10 . Other fiber-forming materials, such as polymer solutions, may also be used, although solid polymer materials in pellets or other specific shapes are most commonly used and melt into a liquid in a pumpable state.

[0021] The extrusion head 10 may be a conventional spinneret or spinneret pack, typically comprising a plurality of orifices arranged in a regular pattern, for example in a linear array. Filament-forming liquid filaments 15 are extruded from the extrusion head and conveyed into a treatment chamber or attenuator 16 . Typically, some cooling stream of air or other gas is provided to the extruded ...

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Abstract

A coherent nonwoven fibrous web comprises directly formed elastic fibers that have a molecular orientation sufficient to provide a birefringence number of at least 1 x 10<-5> and preferably at least 1 x 10<-2>. The web can be made by a method that comprises a) extruding filaments of elastic-fiber-forming material; b) directing the filaments through a processing chamber in which gaseous currents apply a longitudinal stress to the filaments that attenuates and draws the filaments; c) maintaining the filaments at their orienting temperature while the filaments are under attenuating and drawing stress for a sufficient time for molecules within the filaments to become oriented along the length of the filaments; d) cooling the filaments to their orientation-locking temperature while the filaments are under attenuating and drawing stress and further cooling the filaments to a solidified fiber form; and e) collecting the solidified fibers as a fibrous nonwoven web. In a preferred aspect, the method includes the further step of annealing the collected fibers by exposing them to a temperature that is above their shrinking temperature but less than their relaxation temperature, and preferably bonding the fibers after (or before) the annealing step. Dimensionally stable webs comprising elastic oriented fibers are obtained.

Description

technical field [0001] The present invention relates to a nonwoven fibrous web comprising elastic fibers whereby the web as a whole can have elastic properties. Background technique [0002] Significant commercial opportunities await nonwoven fibrous webs that are stretchable, elastic, and strong. Such webs may be useful for making form-fitting garments, or for making cuffs, necklines, or other parts of garments that elastically retain their shape. Alternatively, the web can provide breathable, soft, lightweight, cloth-like fibers. Also, such webs tend to have high friction, which can be useful in many applications. [0003] Recognizing this opportunity, many existing producers have contemplated producing elastic nonwoven fibrous webs. Their prior work is reflected in the patent literature, including US Patent Nos. 3,686,385; 4,707,398; 4,820,572; 4,891,957; 5,322,728; [0004] While existing data can meet some needs, many opportunities remain unsatisfactory. Overall, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/00D04H3/08D04H3/14
CPCD04H3/14Y10T442/69Y10T442/681D01F6/04Y10T442/697D01F6/60D04H3/08D01F6/42D01F6/70Y10T442/601D01F6/06D01D5/0985Y10T442/602Y10T442/689D01F6/62Y10T442/68D04H3/00D04H3/02D04H3/11D04H3/005
Inventor 迈克尔·R·贝里甘安尼·N·德罗维尔布雷德利·W·伊顿布兰迪·S·诺兰特洛伊·K·伊什塔蒂莫西·J·林德奎斯特
Owner 3M INNOVATIVE PROPERTIES CO
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