Thermal expansion resin transfer moulding

Abstract From the Canadian patent

A method of forming a composite sandwich core molded article, comprising forming a thermo-elastic rigid foam core into a desired shape, wrapping the preformed foam core with a fabric, placing said wrapped pre-formed foam core in a mold whose inner confining surfaces form the shape of the final article injecting, a liquid thermosetting resin into the mold such that the thermosetting resin surrounds and wets the fabric wrapped about the pre-formed foam core heating the, mold to a temperature sufficient to expand the rigid foam core to compress the fabric wrapped surface of the foam core against the inner confining surfaces of the mold; and cooling the mold and removing the article from the …