Underwater pelletizer having sealed heat transfer tubes embedded in extrusion die
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United States of America Patent
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May 13, 1997
Grant Date -
N/A
app pub date -
Nov 7, 1995
filing date -
Nov 7, 1995
priority date (Note) -
Expired
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Abstract
An improved underwater pelletizer is provided. The improved pelletizer has sealed heat transfer tubes embedded within the extruder die to utilize the heat of the molten polymer entering the extruder die by efficiently transferring that heat to the die plate and die face of the pelletizer. Ceramic inserts and/or inserts of other insulating materials are provided adjacent the die plate to insulate the passages through which the molten polymer passes and to inhibit cooling of the polymer within the extruder die as it approaches the die plate. The insulating inserts are positioned behind, and abut, the die plate around the passages that deliver the molten polymer to the die plate. Water makeup is provided at the cutter blades of the pelletizer to prevent cavitation within the water housing so that pellets will not agglomerate within the water housing.
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