Method for molding plastic container with an integrally formed c

Details Method for molding plastic container with an integrally formed c Method for molding plastic container with an integrally formed c

1985-10-03

1989-07-18

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

425525, B29C 4700

Patent

active

048491543

ABSTRACT:
A method for forming a plastic container having an integrally formed chime structure is disclosed. A lower mold is raised toward but does not contact an extrusion die. Molten resin is then filled into the lower mold and subsequently the lower mold is raised into contact with the extrusion die. The lower mold is then lowered from the extrusion die between partable mold halves while resin is simultaneously extruded thereby forming a hollow parison between the extrusion die and the lower mold. The lower mold is then stopped when a parison of desired length has been formed. The mold halves are then closed and the parison is blown into conformity with the walls of a mold cavity formed by the closed mold halves. In the case where the parison length is greater than the axial length of the mold halves, the lower mold is raised slightly after closing of the mold halves and before blowing of the parison.

REFERENCES:
patent: 2936481 (1960-05-01), Wilkalis et al.
patent: 2936489 (1960-05-01), Sherman
patent: 3650653 (1972-03-01), Erickson
patent: 3949034 (1976-04-01), Uhlig
patent: 4117062 (1978-09-01), Uhlig
patent: 4540544 (1985-09-01), Jakobsen et al.

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