Method and apparatus for producing plastic objects with solid se

Details Method and apparatus for producing plastic objects with solid se Method and apparatus for producing plastic objects with solid se

1996-07-10

1998-07-07

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

057764123

ABSTRACT:
A method and an apparatus are disclosed for producing plastic objects with solid regions and hollow regions. The method has the following steps: a) blocking off a part of the cavity (2) of a molding tool (1), so that little or no plastic melt can reach the blocked-off region (8); b) injecting plastic melt into the unblocked region (9) of the cavity (2) of the molding tool (1); c) releasing the blockage, so that plastic melt can reach the previously blocked-off region (8) of the cavity (2); d) injecting a pressurized gas into the melt by means of at least one fluid injection nozzle (7), so that the melt injected into the molding tool is distributed into the desired regions of the cavity (2) while forming a hollow space and is pressed against the cavity walls of the molding tool (1); e) allowing the molded part (6) to cool; f) relieving the cavity (2) of the pressure of the pressurized fluid; and g) demolding the molded part. The advantage achieved thereby is that solid regions and hollow regions are formed in the molded part in a predetermined manner.

REFERENCES:
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patent: 5612067 (1997-03-01), Kurihara et al.
Jaroschek, et al., "Gasinnendruck zum Ausblasen uberschussiger Schmelze," pp. 873-876, 2376 Kunststoffe 80, No. 8, Munchen, DE (Aug. 1990).
G. Steinbichler, "9.1 Hohlkorper-Spritzgu.beta. mit veranderbarem Formnestvolumen," Spritzgie.beta. technisches Kolloquium, TAK (1990).

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