Method for injection-moulding a hollow product using a pressure

Details Method for injection-moulding a hollow product using a pressure Method for injection-moulding a hollow product using a pressure

1996-01-26

1999-12-07

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

425130, B29C 4500

Patent

active

05997799&

ABSTRACT:
A method is described for injection-moulding a product by means of the so-called gas-injection method. A special feature of the method is that in addition to the injection of gas into the product cavity (10) via a first gas inlet (51), gas is injected into a spill cavity (20) via a second gas inlet (52). The amount of material (1) flowing from and toward the spill cavity (20) can be controlled by the location of the second gas inlet (52). Moreover, a variant of the method prevents the formation of so-called dead ends. By means of another variant of the method in accordance with the invention it is possible to prevent the occurrence of so-called flow lines.

REFERENCES:
patent: 5069858 (1991-12-01), Hendry
patent: 5098637 (1992-03-01), Hendry
patent: 5204050 (1993-04-01), Loren
patent: 5324189 (1994-06-01), Hendry
patent: 5482669 (1996-01-01), Shah
patent: 5612067 (1997-03-01), Kurihara et al.

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