Process for two-stage injection molding of air-conditioning blow

Details Process for two-stage injection molding of air-conditioning blow Process for two-stage injection molding of air-conditioning blow

1993-05-18

1994-10-04

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264264, 425DIG34, B32B 100, B32B 300, B32B 704

Patent

active

053523997

ABSTRACT:
In two-stage injection molding of a blow-out port device including a housing of synthetic resin, which includes pairs of shaft bores provided in a coaxial arrangement in opposed wall portions of a peripheral wall to extend through the opposed wall portions, and a plurality of blades of synthetic resin which each include a pair of support shafts projectingly provided at opposite ends of a blade body disposed within the housing and rotatably fitted in the shaft bores, the following steps are used: a primary injection step for forming the housing; a secondary injection step for forming blade bodies by using shaft bores in the housing as support shaft-forming cavities; a step of permitting the blow-out port device to be left on one of opening/closing dies by utilizing protrusion fitted in recesses formed in the housing; and a step of bringing ejector pins into abutment against rear edges of the blades to push-off the blow-out port device from the opening/closing die. Thus, the air-conditioning blow-out port device produced by the two-stage injection molding process can be released from the dies without deterioration of its quality.

REFERENCES:
patent: 4414170 (1983-11-01), Sano
patent: 4569457 (1986-02-01), Hatakeyama et al.
patent: 4702156 (1987-10-01), Sano

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