Chemical barrier fabric

Inactive Publication Date: 2009-12-17
ANSELL MICROGARD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The Applicant has discovered a principle which is that all the layers of a chemical barrier fabric can be in less than all-over con

Problems solved by technology

The limitations of such materials as chemical barriers for protective apparel have long been recognised.
They are either prone to chemical degradation (e.g. polyurethane), or have poor resistance to chemical permeation through the film layer (e.g. polyethylene).
The disadvantage of this is that the fabrics/protective apparel made from such composites are generally st

Method used

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Examples

Experimental program
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Effect test

example 1

[0076]Referring to FIG. 11a, a known polypropylene co-polymer film 48 of thickness 30 microns was tested in its unprocessed state for permeation of ammonia solution using test method EN 369: 1993. The breakthrough time was 8 minutes.

example 2

[0077]A known co-extruded polymer film 46a of total thickness 40 microns is shown in FIG. 11b. This film 46a comprises a 4 microns thick core layer 50 of EVOH bonded by means of tie layers (not shown) to first 52a and second 52b outer polypropylene co-polymer layers 14 microns thick. This film 46a was tested in its unprocessed state for permeation of a 35% ammonia solution as for Example 1. The breakthrough time for this film was 21 minutes.

example 3

[0078]The 30 microns polypropylene co-polymer film 48 of Example 1 and the co-extruded polymer 46a film of Example 2 were bonded together with a 40 g / m2 basis weight polypropylene spunbonded non-woven fabric 58 using thermal point-bonding in a single calender bonding lamination step. The resultant chemical barrier fabric 12 thus comprised a 30 microns polypropylene co-polymer film forming the upper layer 18 (and upper surface 38) of the fabric, a non-woven layer 58 forming the lower layer 22 (and lower surface 40) of the fabric, and a co-extruded film layer disposed therebetween forming the middle layer 20 of the fabric. This fabric structure is shown in FIG. 11c.

[0079]The diamond point-bond pattern of FIG. 10 was utilised in the manufacture of this chemical barrier fabric 12, giving a point-bond area of substantially 19% of the surface of the fabric. Approximately 81% of the area of the fabric surface was un-bonded. The extent of the bonding between the component layers 18, 20 and...

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Abstract

A chemical barrier fabric (12) and a method of manufacturing the fabric is described. The chemical barrier fabric (12) includes at least first (18) and second (20) chemical barrier layers which have an interfacial region therebetween and which are intermittently point bonded (34) providing a point-bonded area which is in the minority and an un-bonded area (36) which is in the majority in the interfacial region. The chemical barrier layers (18, 20) typically comprise single layer polymer films and/or co-extruded layers. A non-woven layer 22 may also be point-bonded to either the first (18) or the second (20) chemical barrier layer to give support to the fabric (12).

Description

TECHNICAL FIELD[0001]The present invention relates to a chemical barrier fabric comprising a plurality of layers. Such a chemical barrier fabric may be used, for example, in the manufacture of protective apparel which protect the wearer against a wide range of chemicals or for use as military or civil defence chemical protective cover applications. Such applications include, for example, covers for the chemical protection of equipment or for the manufacture of tent components or temporary shelters or for military or civil defence medical products such as evacuation or casualty bags. By civil defence is meant any of the emergency services, police, fire brigade, hospitals and other defensive measures which might be taken by local authorities or private organisations for the protection of their members.BACKGROUND ART[0002]The use of Personal Protective Equipment (PPE) is mandated in industry to protect operators against various hazards such as excessive heat, mechanical abrasion or lac...

Claims

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Application Information

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IPC IPC(8): B32B27/12B32B37/00B32B7/04B29C65/02B29C65/08B32B3/28B32B27/08B32B33/00
CPCB29C65/02Y10T428/24826B29C66/45B29C66/83411B29C66/83413B29K2105/0854B29K2313/00B29L2009/00B32B3/28B32B27/08B32B27/12B32B33/00B32B37/0076B32B37/0084B32B2305/20B32B2310/028D04H1/555D04H13/00B29C65/086B32B5/022B32B7/045B32B7/12B32B27/32B29C66/81429B29C66/7294B29C66/81433Y10T428/2481B29C66/21B29C66/91421B29C66/91423B29C66/91431B29C66/91641B29C66/919B29C66/91931B29C66/91935B29C66/71B29C65/18B29C66/73921B29C66/7234B29K2077/00B29K2023/10B29K2027/06B29K2027/08B29K2023/12B29K2023/086A41D31/02A62D5/00B32B7/04B32B2323/10B32B2307/714B32B2262/0253B32B7/05
Inventor SQUIRES, LESLIE JAMESWOODBRIDGE, TIMOTHY
Owner ANSELL MICROGARD
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