Process for forming a threaded molded plastic article

Details Process for forming a threaded molded plastic article Process for forming a threaded molded plastic article

1996-10-09

1998-08-25

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

249 59, 2643281, 264334, 425556, 425DIG58, B29C 4544

Patent

active

057980748

ABSTRACT:
Apparatus includes a female mold and a mold core cooperating with the female mold to form a mold cavity therebetween in the mold closed position for the formation of a threaded, mold article therein. A movable, rotatable stripper ring is provided over the core, and means are provided to rotate the stripper ring from a rearward to a forward position and thereby remove the threaded article from the mold core by rotating same. A process for forming a threaded, molded plastic article is disclosed including molding the article in an injection mold and removing the article from the mold by rotating a rotatable and movable unscrewing means to rotate and remove the article from the mold core.

REFERENCES:
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patent: 5565223 (1996-10-01), McCready et al.
Kunststoffe, vol. 64, No. 8, 1974, Munchen DE pp. 393-395--Gemmer--"Spritzgiesswerkzeug fur Verschlusskappe mit Innengewinde aus Polypropylen".
Patent Abstracts of Japan, vol. 12, No. 142 (M-692) (2989) Apr. 30, 1988 & JP-A-62 264 923 (Sumitomo Heavy Ind Ltd).

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