Fine powder of waste polyurethane foam and method of manufacturing the same
AssigneeIndustry-Academic Cooperation Foundation Gyeongsang National University
InventorsJin-Kuk Kim, Kyum-Woo Choi
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Abstract
Disclosed are fine powder of waste polyurethane foam and a manufacturing method thereof. According to this invention, fine powder of waste polyurethane foam can be manufactured using a crushing process including primary and secondary coarse crushing steps and a fine grinding step and a classification process, thereby solving conventional problems of the deterioration of the properties and the difficulty forming a desired cell structure, due to the use of waste polyurethane powder having a large particle diameter, and widening the range of waste polyurethane that can be recycled.
Claims4
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.
Dependencies are inferred from the claim text.