Method for producing plastic objects

Details Method for producing plastic objects Method for producing plastic objects

1996-07-29

1998-06-02

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264572, 425130, B29C 4517, B29C 4573, B29C 4577

Patent

active

057594597

ABSTRACT:
A method and an apparatus for producing plastic objects with hollow spaces is disclosed. The method comprises the following steps: injecting a sufficient amount of plastic melt into the cavity (2) of the molding tool (1); simultaneously and/or subsequently injecting a pressurized fluid into the melt by means of a fluid injection nozzle (7); allowing the molded part (6) to cool; relieving the cavity (2) of the pressure of the compressed fluid, and demolding the molded part, while plastic melt is driven out into at least one overflow cavity (8), which is connected to the cavity (2). According to the invention, the volume of the overflow cavity (8) is changed, and in particular enlarged. This volume increase advantageously is controlled or regulated. The advantage achieved thereby is that the injection molding cycle, especially the overflow of melt into the overflow cavity (8), remains controllable by simple means.

REFERENCES:
patent: 5607640 (1997-03-01), Hendry
Eyerer, P., "Spritzgeiss en mit Gasinnendruck,"Kunststoffe 83, pp. 505-517 (1993). (English Language Abstract).

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