Compounding crystalline organic materials

Details Compounding crystalline organic materials Compounding crystalline organic materials

1986-06-20

1988-09-06

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

To form particulate product

264330, 425308, 425456, 544135, B29B 906

Patent

active

047692006

ABSTRACT:
In order to compound organic materials which are crystalline under standard conditions, these materials, in the pulverulent and/or molten state, are processed in a self-purging, twin-screw extruder in which the screws rotate in the same direction, ejected through one or more narrow passages into a low pressure zone, cooled and comminuted to give particles. In order to improve the pourability and shelf life, the materials are completely crystallized by the time they reach the end of the screws, and are heated during discharge through the narrow passage, in order to form a melt film. Dust-free granules havig a smooth surface can be produced in this manner.

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patent: 3719648 (1973-03-01), Frielink
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patent: 4435603 (1984-03-01), Cornils et al.
patent: 4581443 (1986-04-01), Garg
patent: 4602082 (1986-07-01), Akiyama et al.

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