Injection molding method for manufacturing a thermoplastic part

Details Injection molding method for manufacturing a thermoplastic part Injection molding method for manufacturing a thermoplastic part

1991-12-10

1993-08-03

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

2643288, 26432813, 425542, 425577, B29C 4500

Patent

active

052326543

ABSTRACT:
When injection-molding a molten thermoplastic resin into a molding having different thicknesses, a void inducing member is set in a cavity corresponding to heavy sections. Then gas pressure is applied passing through a gas passageway to a tip end of the void inducing member, thus forming a void nucleus in the resin adjacent to the tip end of the void inducing member. The void nucleus develops to a void by shrinking force of the resin as the molten resin cools.

REFERENCES:
patent: 4685881 (1987-08-01), Sasaki
patent: 5069858 (1991-12-01), Hendry
patent: 5080570 (1992-01-01), Baxi et al.

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