Patent ID: 7559492

Claim:
A method of manufacturing fine powder of waste polyurethane foam, comprising the steps of: a) crushing waste polyurethane foam to an average size of 2 to 4 mm using a primary coarse crusher and then to an average size of 150 to 160 μm using a secondary coarse crusher; b) crushing the foam obtained in the step a) using a ball mill; c) loading the foam obtained in the step b) into a feeder and grinding the loaded foam to a size of 1 to 128 μm using a jet mill; and d) loading the foam obtained in the step c) into a forced vortex centrifugal classifier, and then packing the foam having a particle diameter of 1 to 45 μm and passing through the classifier and re-loading the foam, which has a large particle diameter and does not pass through the classifier, into the feeder.