PROCESS FOR THE MANUFACTURE OF PRODUCTS OFFERING HIGH-QUALITY ACOUSTIC INSULATION PROPERTIES

摘要

The production of composite structural products having high sound-proofing characteristics by impregnating a mat of fibers of substantial length with an organic thermoplastic resin containing an expanding agent, and thereafter heating the treated mat. The resin is partially jelled during the initial stage of heating and the expanding agent is dissociated during the later stage of the heating, which results in a controlled swelling of resin while the resin completes the jelling thereof while the product attains its predetermined density. Upon the cooling of the material it is transformed from a plastic to an elastic state, especially in the direction of thickness of the product.