Process for pulverising polyurethane, polyurea and/or polyurethane/polyurea materials in a roller mill
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Jan 24, 1996
filing date -
Jul 30, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
When pulverising polyurethane, polyurea and/or polyurethane/polyurea materials in a roller mill with at least two rollers (2,3) rotating at different circumferential speeds, a very economical method of operation is achieved by returning the coarse fraction falling freely out of the roll slit (4) to the roll slit (4) and stripping the fine material adhering to the roller (3) with the higher circumferential speed and discharging it separately from the coarse fraction.
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