B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/702
B29C 45/58 (2006.01) B29C 45/24 (2006.01)
Patent
CA 1126457
RP-8351-M-26 APPARATUS AND METHOD FOR INJECTION MOLDING OF CERTAIN PLASTICS TO MAXIMIZE DISPERSION OF COLOR AND CARBONIZATION IN PRODUCT Abstract of the Disclosure A method of injection molding for plastics taken from the family of polyolefins and particularly polyethylene, polypropylene, linear polyethylene, copolymers, and styrene, in which the plastic material is forced through a screen pack including at least two screens immediately in advance of an injection nozzle. This system maximizes uniform dis- persion of color in the polyolefins and substantially elimin- ates the inclusion of optically (human) observable black particles, such as carbonized pieces of the polyolefin or other ingredients. The apparatus consists essentially of an injection nozzle, a screen pack retainer to which the nozzle is secured, and a screen pack between the nozzle and retainer. The screen pack comprises a disk having a circular recess opening onto one face thereof, a fine mesh screen in said recess, and a breaker plate covering the screen and clamped to the disk.
321173
Dart Industries Inc.
Gowling Lafleur Henderson Llp
LandOfFree
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