Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1980-12-01
1982-08-31
Michl, Paul R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264245, 264251, 264255, 264537, B29D 300
Patent
active
043472095
ABSTRACT:
A method for injection molding a particularly elongated tubular parison having a closed bottom and assuring consistently uniform wall thickness in the tube wall, is disclosed. The method involves injection molding an open bottom tubular member, and thereafter forming a bottom wall integrally with the tubular member in a separate injection molding step in which a molten polymer is injected into a mold cavity defined, in part, by the bottom end of the tubular member. During the first injection molding step, the core mold is held at both ends by the other components of the mold assembly so that there is no possibility of eccentric misplacement of the elongated core in the mold cavity due to flexing of the core, which would cause non-uniformity in wall thickness of the molded tube. The open bottom of the tube is closed by injecting additional polymer during the second injection molding step, wherein a portion of the mold cavity is defined by the bottom end of the previously formed tubular member, so that the injection molded bottom wall is integrated to the tube parison in accurate relative position to the tubular wall.
REFERENCES:
patent: 3822332 (1974-07-01), Hrach
patent: 3950483 (1976-04-01), Spier
patent: 4035466 (1977-07-01), Langecker
patent: 4052497 (1977-10-01), Monnet
patent: 4150088 (1979-04-01), Chang
patent: 4157883 (1979-06-01), Mares
Michl Paul R.
Yoshino Kogyosho Co. Ltd.
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