Method and apparatus for injection molding a hollow-wall contain

Details Method and apparatus for injection molding a hollow-wall contain Method and apparatus for injection molding a hollow-wall contain

1995-04-04

1996-12-17

Heitbrink, Tim

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

425130, 425562, 425DIG58, B29C 4516

Patent

active

055844707

ABSTRACT:
An injection-molding apparatus for making a hollow-wall container having sides and a base has front and rear mold parts together forming side surfaces of a mold cavity centered on an axis and a floor mold part defining a base surface of the mold cavity. An inner core sleeve and an outer core sleeve are axially displaceable relative to each other and to the mold parts and have front ends. The sleeves together form a passage extending to the front ends and the front ends form a compartment. A sleeve actuator can displace the sleeves axially between a front position with the front ends of the sleeves projecting relatively far into the cavity and a rear position with the front ends of the sleeves generally retracted from the cavity. A piston/cylinder unit formed between the sleeves connected to the passage is pressurizable to shift the sleeves relative to each other and thereby open up the compartment into the cavity. A floor actuator can axially shift the floor between front and rear positions.

REFERENCES:
patent: 4990083 (1991-02-01), Bernhardt
patent: 5254306 (1993-10-01), Inada
patent: 5397226 (1995-03-01), Vandenberg
Kunststoffe, voly 79, No. 11, Nov. 1, 1989 "Neue Moglichkeiten beim Spritzgiessen durch das Gasinnendruckverfahren" by B. Klotz & E. Burkle.

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