B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 3/26 (2006.01) B32B 27/08 (2006.01)
Patent
CA 2225392
The disclosure is directed to provide a method of making a stretched, multilayer breathable film that provides a barrier to microorganisms and provides a barrier to blood and bodily fluids and the film itself. The method involves simultaneously extruding (20) at least a five-layer film from a die having the structure C:A:B:A:C. In this structure, the core layer B is a microporous layer containing at least one thermoplastic polymer and one particulate filler. The outer layers C are monolithic and are composed of a hydrophilic polymer resin that is free of particulate filler. Layers A represent microporous adhesive layers. Following extrusion, stretching (40) of the film is performed. Stretching creates micropores in core layer and adhesive layer. After stretching, the film is slit (50) and wound (60).
L'invention porte sur un procédé de fabrication d'un tissu multicouche étiré et respirant constituant une barrière contre les micro-organismes, le sang et les fluides corporels, et sur le tissu lui-même. Ledit procédé consiste à extruder en simultanéité (20) un film d'au moins 5 couches à l'aide d'une filière de structure C:A:B:A:C. Dans cette structure, la couche centrale B, microporeuse, se compose d'au moins un polymère thermoplastique et d'une charge particulaire, et les couches extérieures C, monolithiques, se composent d'une résine polymère hydrophile sans charges. Quant aux couches A, elles sont faites d'adhésifs microporeux. Après l'extrusion, on procède à l'étirage (40) du film qui crée des micropores dans la couche centrale et dans les couches adhésives, puis on le découpe en bandes (50) et on le bobine (60).
Borden Ladner Gervais Llp
Kimberly-Clark Worldwide Inc.
LandOfFree
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