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

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.