Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1984-10-12
1985-10-22
McCamish, Marion E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
427243, 427296, 427387, 4274073, 427412, 428230, 428247, 428253, 428254, 428447, B32B 700
Patent
active
045488592
ABSTRACT:
In vacuum bagging and similar operations involving composite materials, it is necessary to provide both a release layer that directly contacts the composite material and will not adhere to such material, and passages for removing entrapped air. A problem with known release layers is that they are not sufficiently stretchable to provide uniform contact with complex or sharply bending surface configurations. The invention provides a breather/release material (6). Material (6) includes a flexible, stretchable foraminous fabric (10) that has a ribbed major surface (16). A foraminous coating (20) of silicone rubber release compound is formed on fabric (10) by a shrink drying process. Coating (20) conforms to the ribbed configuration of surface (16) and has holes (24) generally coinciding with holes (12) in fabric (10). Ribbed surface (16) may be bonded to an impervious layer (4) with an adhesive (8). Passageways (26) formed by ribs (14) of surface (16) and holes (12, 24) are kept open by limiting the amount of adhesive ( 8) used.
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Kline William T.
Mittelstadt Robert F.
McCamish Marion E.
Pauly Joan H.
The Boeing Company
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