Process and apparatus for underwater granulation of molten thermoplastic material particularly during start-up periods
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United States of America Patent
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-
Sep 1, 1992
Grant Date -
N/A
app pub date -
Nov 19, 1990
filing date -
Dec 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In order to prevent solidification of melt in the openings in an orifice plate of an underwater granulator during start-up, the water discharged from the housing of the granulator is diverted to a low pressure outlet so that during start-up a ring of water is formed on the inner surface of the housing. Thereby, melt strands from the orifice plate are cut in air and after the throughout of the melt becomes sufficiently high, the water discharged from the granulator is no longer diverted but is supplied to a post-treatment station and the housing becomes filled with water due to higher back pressure whereupon underwater granulation takes place.
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