Molding method using two different resins and a membrane
OwnerJohn Newtoninventor
Life of this patent
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Abstract
An injection molding method which injects a first resin in a first cavity (1) and a second resin in a second cavity (2) with a flexible fabric and porous membrane (3) spanning the interior of the cavity to inpart define the two cavities (1, 2). The second cavity is filled with fibers (14) and is vented via vents (6). The first resin injected into cavity (1) can penetrate the membrane (3) and fuse with the second resin in cavity (2). A nozzle (5) penetrates the membrane (3) with the membrane forming a seal thereabout for delivery of the second resin to the cavity (2).
Claims17
A method of molding a composite rigid article which comprises providing a mold adapted to receive a first matrix component for molding the article, inserting a flexible membrane in the mold so as to define first and second contiguous volumes separated thereby, said second volume being full of reinforcing fiber, said membrane acts as a boundary between said first and second volumes, injecting a first resinous matrix material on one side of the said membrane into said first volume thereby decreasing the size of the second volume and at a rate to provide a pressure buildup serving to compress the fibers within said second volume, injecting a second resinous matrix material on the other side of the membrane into said second volume and curing the system to form said rigid article, while said pressure buildup is maintained in said second volume.
A method as claimed in 11 in which the first matrix resinous material forms a wear resistant surface and provides a surface coating on the finished composite article.
Dependencies are inferred from the claim text.