Method and apparatus for making plastic articles

Details Method and apparatus for making plastic articles Method and apparatus for making plastic articles

1977-07-07

1979-01-30

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425528, 425529, B29C 300

Patent

active

041370317

ABSTRACT:
A method and apparatus for molding an end portion of a tubular thermoplastic parison prior to a blow molding operation to form a parision finish and an annular support flange. The method includes closing a laterally movable, sectional mold onto a circumferential section of a parison so that at least one end portion of the parison extends out of the mold. The extending end portion of the parison is then thermally conditioned to a deformable temperature and thereafter the parison is axially displaced to telescopically insert the thermally conditioned end portion within the mold into general radial alignment with annular, longitudinally spaced finish and support flange cavities. Next, an internal support is telescopically inserted within the thermally conditioned parison portion in preparation for the compression molding steps; which include axially displacing the opposed ends of the parison to force thermally conditioned, deformable plastic parison material radially outwardly into the flange and finish cavities.

REFERENCES:
patent: 3457592 (1969-07-01), Winchester, Jr.
patent: 3531556 (1970-09-01), Mehnert
patent: 3960474 (1976-06-01), Kader
patent: 3969060 (1976-07-01), Rosenkranz et al.
patent: 4070141 (1978-01-01), Ryder

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