Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – With internal application of fluid pressure
Patent
1992-12-14
1994-04-19
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, B29C 4503
Patent
active
053043413
ABSTRACT:
A plastics injection molding machine includes an injection mold having a cavity for molding a part with channels of relatively larger and smaller volumes. Plastics material and pressurized gas are injected into the cavity and are forced to flow into the channels. A flow restricting element is selectively extendable into the smaller volume channel to decrease the rate at which the plastics material flows into the smaller volume channel in order to balance the distribution of plastics material and gas among the channels, and develop a part with substantially uniform cross-sectional material wall thickness desired gas penetration length in hollow channels.
REFERENCES:
patent: 5028377 (1991-07-01), Hendry
patent: 5098637 (1992-03-01), Hendry
patent: 5204051 (1993-04-01), Jaroschek
patent: 5254306 (1993-10-01), Inada et al.
SAE Technical Paper 910879, Suresh Shah and Dave Hlavaty, "Gas Injection Molding of Thermoplastic Composite Window Guidance Channel", Feb. 25-Mar. 1, 1991.
General Motors Corporation
Grove George A.
Timm Catherine
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