Manufacturing method of foam sheet for shoes with TPU powder and recycled PU scrap powder

Abstract

The present invention relates to a manufacturing method for a foam sheet for shoes containing Thermoplastic polyurethane (TPU) powder and recycled Polyurethane (PU) scrap powder, the foam sheet manufactured by the method thereof, and the foam sheet produced an eco-friendly polyurethane foam composition by water foam, where the method includes firstly the recycled PU scrap powder is mixed with polyol, and then the processing speed in a process is controlled through a side-feeder to react while adding the TPU powder and recycled PU scrap powder secondarily, thereby preventing a rise in viscosity of the raw material, so that even if a larger amount of recycled materials is used than before, it is possible to form foam sheets for shoes, such as shoe insoles or foam packages for shoe uppers, with the same level of product quality as conventional products.

Dependencies are inferred from the claim text.