Process for recycling rigid polyurethane foam

摘要

For the reusing of rigid polyurethane foam, use is made of a process in which the starting product is predried and then mixed with a polyurethane adhesive or similar binder. This product is fed to preheated moulds, while admixing a catalyst, the moulds are filled and then a moulding pressure of 3-10 N/mm<2> is applied to the mixture with the mould or in the mould. This compressed material, or the moulding now obtained, is then subsequently heated and, after a waiting time of just a few minutes, is demoulded as a moulded part and is then stored. The moulds run through a turntable and are consequently used repeatedly, a plurality of these turntables being arranged in parallel and supplied with material via the mixing device, so that at high output optimum qualities of the mouldings are maintained.