MANUFACTURING METHOD OF FOAM SHEET FOR SHOES WITH TPU POWDER AND RECYCLED PU SCRAP POWDER
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United States of America Patent
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Issued Date -
Sep 26, 2024
app pub date -
Mar 25, 2024
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Mar 23, 2023
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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, and for an eco-friendly polyurethane foam composition including water foam, 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.
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