Recycling-Verfahren für Polyurethan-Hartschaum

摘要

In recycling polyurethane rigid foam and producing mouldings from treated rigid foam and material is disintegrated to particles less than 10 mm dia., mixed with a polyurethane binder, and pressed at 100-200 deg.C at pressures up to 20 N/mm2. The raw material is dried to a moisture content of 2-4% and placed in a multi-impression mould; the mould is compressed and locked in that state; the material is pressed whilst leaving vent holes, the mould is externally heated to 80-180 deg.C, kept closed for a time and the finished mouldings are removed. During the disintegrating stage PVC granules or cable scrap are pref. added and paper or similar is also added to the foam. ADVANTAGE - The procedure enables recycled polyurethane plus impurities to be processed continuously.