Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1996-07-15
1998-06-23
Mayes, Curtis
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156164, 1563066, 1563073, 1563075, B32B 3120, B32B 3112, A62D 500
Patent
active
057699925
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a process for the production of flexible surface filter material for dealing with harmful gases or liquids (noxious substances), which has at least a first textile carrier layer and a compressed foam layer containing active particles, acting on the noxious substances, and joined to the carrier layer substantially over the entire surface area, wherein prior to the application of the carrier layer the foam layer is impregnated with a paste containing the active particles in a binding agent and then compressed and adhesively joined to the carrier layer.
The invention further concerns the production of surface materials produced in that way.
Several requirements frequently have to be fulfilled in the case of surface or flat filter materials. On the one hand the material is to exhibit adequate stability. If foam is used as the matrix for the filter material, that stability will normally only be achieved if the foam matrix which carries the usually adsorbent particles is joined to a layer which is stable in respect of shape, substantially over the entire surface area thereof. In addition there are a large number of areas of use, in particular for protective clothing, where it is desirable for the surface or flat filter material to be of the smallest possible thickness, in particular because such a material is better air-permeable and in particular more flexible, in comparison with thicker material. When using excessively thin foam however there is now the risk that the adsorption capacity falls sharply and the surface filter material no longer has the protective effect which is required for the intended area of use.
EP 0 526 264 Al already discloses a material for NBC-protective clothing, which as an inner layer includes a laminate comprising a foam layer impregnated with a paste having activated carbon particles, and a textile carrier layer. In order to reduce thickness and improve air-permeability, it is proposed here that the foam layer is compressed subsequently to the operation of impregnation with the paste containing the activated carbon particles, and is adhesively joined to the carrier layer over the entire surface area. In that respect, in accordance with the state of the art, the procedure is such that compression of the foam layer which is impregnated with the activated carbon paste is effected before the foam layer is glued to the carrier layer. That procedure suffers from a number of deficiencies, in which respect in particular the lack of mechanical stability of relatively thin foam layers is to be taken into account. That has the result that the foam layer generally distorts in the compression operation so that it can only be joined uniformly and over the entire surface area to the corresponding carrier layer, with the greatest of difficulties. A further problem in processing thin foams is that they are highly liable to tearing. An aspect which causes particular problems with the known process however is the point that, because of its low degree of stability, the foam is compressed to different degrees under some circumstances, which means that the protective material has different protective effects at different locations.
U.S. Pat. No. 4,787,949 discloses filters with a high degree of water absorption capability. Those filters comprise a filter paper layer. A powder which is greatly water-absorbent is applied to the filter paper layer. The powder layer is then covered with a thin fleece paper. Water is then sprayed on to the thin fleece layer, whereby the water absorbent powder becomes sticky and forms a certain join as between the filter paper and the fleece layer. After water has been sprayed on, the entire arrangement is then compressed to reduce the thickness of the filter paper layer.
The production of those known filters presupposes that the filter paper layer can be compressed without problems and after compression remains in the corresponding condition but does not return to the original thickness by virtue of its elasticity because in fact the powder layer which
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Helsa-Werke Helmut Sandler GmbH & Co. KG
Mayes Curtis
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