This method is the most common physical recycling method. The key points are: first the polyurethane
foam wastes are shattered into fine flake, coating with adhesive, which is commonly MDI or PAPI, about
5%-10%. Direct access to water vapor of high temperature, make polyurethane adhesive melting or
dissolved. And then press solidified into a certain shape of foam.
Jiang [15] regenerated a kind of waste rigid polyurethane foam plastic and produced insulation board.
The present invention had simple process, low cost and environmentally friendly. But the largest defect is
that performance of regenerated foam product was declining, which only applied to furniture, car lining
and cheap components.