Patent ID: 6685789
Filing Date: 2004-02-03
Classification: B29C,B29K,B29L,Y10T

Abstract:
A method of manufacturing a thermomolding, which comprises: thermoforming a plastic panel of one of a heat-deformable, thermoplastic resin, a resin mixture, and a resin matrix, and at least one deformable backing web; inserting the backing web into a space between the plastic panel and a deep-drawing mold prior to thermoforming; holding the plastic panel by a support frame during thermoforming and holding the backing web by a fixing means during thermoforming so that the plastic panel and backing web have surfaces that lay together; providing that the deformable backing web consists of one of (1) a material which stretches under the conditions of pressure and temperature occurring upon thermoforming, and (2) a material which does not stretch under the pressure and temperature conditions occurring upon thermoforming but is deformable on its surface by an intermeshing or change in angular position; and including the steps of adjusting the pressure and temperature conditions of the thermoforming so that the plastic panel and the backing web are undetachably connected to each other directly by one of incorporation and melting together, and increasing the pressing pressure by additional compressed-air support, wherein said panel and backing web are flat before said thermoforming and have surfaces that lay together flat before said thermoforming, and including the steps of removing air from the deep drawing mold under the panel and synchronizing said air removal with feeding compressed air into a closed cavity over said panel.