Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – To form particulate product
Patent
1989-12-26
1992-02-04
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
To form particulate product
34 10, 264349, B29B 900, B29C 4700
Patent
active
050858157
ABSTRACT:
A process for the recovery of dry polymer, wherein a polymer material containing water and/or volatile hydrocarbons is extruded through a die sleeve, cut into particles by means of a cutter mounted at the die discharge, and carried away from the cutter by an air stream. The die sleeve is provided with a plurality of die holes possessing a non-circular derived shape, which allow the material to be dried at lower temperatures and pressures. The cutter is a cage-type cylinder presenting large open areas for the flow of conveying air, thereby significantly reducing the local air velocity through the cutter and tearing of the particles. A bypass is provided to insure sufficient air being present after the cutter region to prevent condensation and to provide crumb transportation through the transport conduit. The invention reduces the generation of fines and results in an increase in the average particle size.
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Ju Shiaw T.
Yeh Richard C.
Cohen H. L.
Exxon Chemical Patents Inc.
Tentoni Leo B.
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