Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1995-01-06
1998-03-24
Zirker, Daniel
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
4282991, 428367, 428408, 428354, B32B 2714, B32B 712
Patent
active
057310653
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a multilayered, textile, gas-permeable filter material against toxic chemical substances and, in particular, filter and protective materials for the production of sheet-like filters and protective suits for the civil and military fields.
Previously known filter materials of the type described at the outset have a textile support material, on which adsorber beads, in particular active carbon beads, are adhered via adhesive screens. These beads are, where applicable, protected from any premature wear and tear by a gas-permeable protective layer (EP-B 0 090 073).
In addition, filter materials are known, in which a woven fabric containing activated carbon fibers is adhered to the textile supports with an adhesive screen. If such fabrics containing activated carbon fibers are laminated between two textile layers, the material obtained according to EP-A-0 230 097 is merely one, in which the fabric containing the activated carbon fibers disintegrates to fine dust already at the slightest tensile strain.
The disadvantage of the state of the art is that there is insufficient bonding of the textile support material with the activated carbon material and, furthermore, the actual adsorption layer which contains the activated carbon can only inadequately withstand mechanical stressing such as that occurring, for example, when protective suits made from the protective material are worn.
The object of the invention is to develop the filter material described in EP-A-230 097, which comprises a first layer as textile support layer, a second layer in the form of an adhesive layer bonded to the first layer and a third layer which is applied to the second layer, is bonded thereto and comprises a textile sheet-like layer containing activated carbon fibers, further such that the disadvantages specified above are avoided.
SUMMARY OF THE INVENTION
This object is accomplished in accordance with the invention, in the filter material described at the outset, in that the second layer is an areal adhesive layer consisting of an adhesive spun fiber yarn, fleece or screen, an adhesive foil, a woven or knitted adhesive fabric or the like or an open-cell foamed material layer laminated to the adjacent layer(s) in the flame laminating process and that the second layer is areally bonded to the first and third layers.
This third layer can be additionally protected by a fourth layer in the form of an areal adhesive layer which is applied to the third layer, opposite the second layer, and areally bonded thereto.
Although extremely thin adhesive layers, in particular in the form of spun yarns, fleeces, foils etc., can be used for the adhesive layers, the fourth layer as adhesive layer is, in particular, sufficient to additionally stabilize the third layer with the textile sheet-like layer containing the activated carbon and to protect it against wear and tear. Surprisingly, the fourth layer offers not only an adequate, mechanical protective effect against wear and tear but also leads, in addition and in cooperation with the second layer in the form of an areal adhesive layer, to a strengthening of the third layer held between the two layers so that this can, for the most part, be selected wholly in view of its protective effect, independently of its inherent mechanical stability, and used in the protective material.
A particularly suitable adhesive layer material is available in the form of slotted adhesive coating foils which act as a type of dry melting adhesive.
The adhesive layer material is preferably produced from a thermoplastic polymer material, reference being made in this respect, in particular, to the plastic materials PVC, polyurethane, polyester and polyamide. It is important in the case of the adhesive layers for them to be adequately gas-permeable, i.e. that the foils have, in particular, a perforation, preferably a microperforation, which is retained during the thermal bonding or the thermal activation of the adhesive layer during processing.
Apart from the adhesive layer
REFERENCES:
patent: 4455187 (1984-06-01), von Blucher et al.
patent: 4457345 (1984-07-01), von Blucher et al.
patent: 4513047 (1985-04-01), Leach et al.
patent: 4520623 (1985-06-01), Ogawa et al.
patent: 4726978 (1988-02-01), Simpson
patent: 4869947 (1989-09-01), Kirayoglu
patent: 4904343 (1990-02-01), Giglia et al.
patent: 5190806 (1993-03-01), Nomi
Japanese Application No. 1-221557, Patent Abstracts of Japan C-660, Nov. 29, 1989, vol. 13, No. 536.
Stabler Gerhard
Stelzmuller Helmut
Stoll Thomas
Topfer Hans-Joachim
Alfred Karcher GmbH & Co.
Hoppin Ralph F.
Lipsitz Barry R.
Zirker Daniel
LandOfFree
Multilayered, textile, gas-permeable filter material against tox does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multilayered, textile, gas-permeable filter material against tox, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilayered, textile, gas-permeable filter material against tox will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2287190