Reverse lip blow molding

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Including application of internal fluid pressure to hollow...

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Details

264527, 264534, 264334, 4254501, 425525, B29C 4904, B29C 4930, B29C 4956

Patent

active

052098915

ABSTRACT:
A blow molded article and an apparatus and method for blow molding the article including a recessed lip. The apparatus includes two plates reciprocally movable toward and away from one another A center ring member and a separating ring are fixedly and perpendicularly mounted on each plate. A mold half is mounted on each plate and is divided into two sections. One section is located on each side of the center ring member and is reciprocally movable toward and away from the center ring member. A first insert member is provided in each mold section in proximity to said center insert member. The first insert has a channel therein for receiving a second insert member. The second insert member is reciprocally movable in said channel and engages the center ring member. The movement of the second insert member is synchronized with respect to the first insert member to move at a speed that is at least half the speed of the first insert. The recessed lip is molded between said center ring members, the first insert member and the second insert member.

REFERENCES:
patent: 3428722 (1969-02-01), Chittenden et al.
patent: 3691267 (1972-09-01), Takehara
patent: 4117062 (1978-09-01), Uhlig
patent: 4228122 (1980-10-01), Hammes
patent: 4228911 (1983-10-01), Hammes
patent: 4378328 (1983-03-01), Przytulla et al.
patent: 4409176 (1983-10-01), Jakobsen et al.
patent: 4529570 (1985-07-01), Przytulla

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