Fine powder of waste polyurethane foam and method of manufacturing the same
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United States of America Patent
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Jul 14, 2009
Grant Date -
May 22, 2008
app pub date -
Nov 16, 2006
filing date -
Nov 16, 2006
priority date (Note) -
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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.
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