Patent ID: 6508963
Filing Date: 2003-01-21
Classification: B29C

Abstract:
Process for manufacturing a cushion made of polyurethane foam covered with a cover, comprising the steps:placing the cover in a mould having the shape of the cushion to be obtained, the cover having a front face forming the exterior decoration layer which is placed against the inside wall of the mould and a rough back face facing towards the inside of the mould; placing a film of thermoplastic material on the rough back face of the cover, the film containing agents reacting with polyurethane isocyanate, said film being initially permeable to water vapour; injecting polyurethane into the mould to form said foam by expanding; said film having a plastification capability under the effect of chemical reactions occurring between the material of the film and the isocyanate contained in the polyurethane; said film further having a sufficiently low predetermined thickness so that the polyurethane foam passes through said film and anchors onto the back face of the cover during expansion and under the effect of the pressure generated by said expansion.