Method of recycling rigid expended polyurethane

Details Method of recycling rigid expended polyurethane Method of recycling rigid expended polyurethane

B - Operations, Transporting

29

B

B29B 17/00 (2006.01) B29B 13/06 (2006.01) B29B 13/10 (2006.01) B29C 35/02 (2006.01) B29C 67/20 (2006.01) B29C 33/36 (2006.01) B29C 43/00 (2006.01)

Patent

CA 2110394

The recycling of used polyurethane foam is made possible by a process in which the starting material is first dried to a moisture content of 2 to 4% and is then filled into a multi-part mold (16, 17, 18) that defines the molded part (32). The parts of the mold (16, 17, 18) are then, with generation of the necessary compression pressure of below 20 N/mm2, pressed together and locked. These molds (16, 17, 18) that are subject to the compression pressure are heated in a tunnel furnace (20) so that the molding material reaches a temperature of approximately 130°C. After a predefined holding time, the molds (16, 17, 18) can be opened under pressure and the molded parts (32) can be removed. Molded parts (32) with a thickness of 42 mm and of corresponding size have been produced successfully with this process. Instead of the molds (16, 17, 18), it is also possible that a two-part tool is used. Also possible is the use of turntables (14, 41, 44), whereby the pressing and holding time can be shortened by adding an accelerator. The process, which comprises only one pressing step, enables an approximately continuous operation.

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