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Flash spun plexifilamentary strands and sheets

A strand and flash-spinning technology, applied in the field of fabrics or fiber webs, and flash-spun plexifilament sheets, can solve the problems of not being durable enough, expensive and uncomfortable for medical clothes

Active Publication Date: 2017-04-19
DUPONT SAFETY & CONSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, one type of fabric or sheet material may be excellent for use in hazardous chemical protective clothing, yet be too expensive or uncomfortable for use in medical clothing
Another material can be lightweight and breathable enough for use in cleanroom suits, but not durable enough for dirty work applications

Method used

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  • Flash spun plexifilamentary strands and sheets
  • Flash spun plexifilamentary strands and sheets
  • Flash spun plexifilamentary strands and sheets

Examples

Experimental program
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Embodiment approach

[0026] In one embodiment, the present invention is directed to flash spun plexifilamentary fiber strands having an overall crystallinity index of less than or equal to 55%.

[0027] In another embodiment, the fiber strands have less than 12m 2 / g BET surface area, extrusion value greater than or equal to 0.9mm / g. In another embodiment, the fiber strand consists essentially of fibers formed from polyethylene.

[0028] In another embodiment, the fiber strand comprises fibers formed primarily of polyethylene, the fibers having a total crystallinity index of less than 52%.

[0029] The fiber strands of the present invention may also have a monoclinic structure and an orthorhombic structure as determined by X-ray analysis described herein, and the crystallinity index of the monoclinic structure is equal to or higher than 1%.

[0030] In another embodiment, any of the embodiments of plexifilamentary fiber strands disclosed herein may be consolidated into a sheet structure. The sh...

Embodiment

[0041] testing method

[0042] In the specification, examples and claims, the following test methods were used to determine the various properties and properties reported.

[0043] The surface area of ​​the plexifilamentary fiber strand product is a measure of the degree of fibrillation and fineness of the flash spun product. Surface area is measured by the BET nitrogen absorption method of S. Brunauer, P. H. Emmett and E. Teller, J. Am. Chem.Soc., Vol. 60, pp. 309-319 (1938), and is expressed in square meters per gram (m 2 / g) is reported in units.

[0044] The squeeze value indicates the ability of a fiber strand to recover its original shape after compression. It was determined using the following procedure: from Reemay ® Three plexifilamentary fiber strands of different sizes were drawn from the sheet. Three samples weighed approximately one gram, two grams and three grams. The reported extrusion values ​​are the average of the values ​​measured for three samples. Ea...

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Abstract

A flash-spun plexifilamentary fiber strand having a BET surface area of less than 12 m2 / g, a crush value of at least 0.9 mm / g wherein said fiber strand comprises predominantly fibers formed from polyethylene, said fibers having a total crystallinity index of less than 55 %, and sheets made thereof.

Description

technical field [0001] The present invention relates to flash spun plexifilamentary sheets, fabrics or webs suitable for use in protective apparel, air filtration and other end use applications. Background technique [0002] Protective clothing includes coveralls, coveralls, coveralls and other garments whose purpose is to protect the wearer from exposure to what is in the wearer's surroundings, or to protect the wearer's surroundings from contamination by the wearer. Examples of protective clothing include suits worn in microelectronics manufacturing cleanrooms, medical gowns and gowns, dirty coveralls, and suits worn to avoid liquids or particles. The specific application for which a protective garment is suitable depends on the composition of the fabric or sheet material used to make the garment, and the method of holding the individual pieces of the fabric or sheet together in the garment. For example, one type of fabric or sheet material may be excellent for use in haz...

Claims

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Application Information

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IPC IPC(8): D01D5/11D01F6/04
CPCD01D5/11D01F6/04
Inventor J.范米维德C.施米茨J.马蒂尤N.S.布拉布斯O.斯科普亚克C.勒莫伊内S.雷布拉特
Owner DUPONT SAFETY & CONSTR INC
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