Mazda Motor Corporation

Nobutaka Tanaka

Takeshi Konishi

Takeshi Yamamoto

Kazuhisa Toh

Shinji Sasaki

Morio Umeda

Yoshikazu Fujioka

Takami Nakamura

Hideyuki Katoh

Yasuyuki Kan

An injection molded product including a plurality of internal cavities is produced by, after having injected a molten resin material into the molding cavity, injecting an inert gas with a gas pressure gradually increasing into the resin material through gas injection nozzles, which are in contact with the resin material to form the respective internal cavities inside the molten resin material. After removing the gas injection nozzles from the resin material for discharging of the inert gas directly from the resin material, any one of the gas injection nozzles, whose temperature during injection of the inert gas was lower than a predetermined temperature level, is judged to be clogged and the gas injection nozzle is cleaned by being blown out with high pressure gas.

Injection molding technique for plural cavity products

A cavity pressure is sequentially changed, by relatively displacing two mold dies forming a mold cavity, to a molding presure at which a product is molded in the mold cavity, a coating pressure lower than the molding pressure at which fluidized thermosetting plastic material is injected to form a coating layer, a curing pressure between the coating pressure and molding pressure at which the coating layer is cured, and a finishing pressure between the coating pressure and curing pressure at which the coating layer thermosets. The changing of the cavity pressure to the coating pressure is initiated a predetermined time later than a termination of a drop in pressure from the molding pressure due to shrinkage of the product. The changing of the cavity pressure to the curing pressure is initiated at a peak of an increase in relative displacement between the two mold dies caused by injecting a fluidized thermosetting plastic material in the mold cavity.

Method of and apparatus for producing a product with a coating layer

The vehicle door construction contains an inner door panel and an outer door panel with a skeleton juxtaposed by the inner and outer door panels and mounted with interior door parts. The vehicle door construction is assembled with the vehicle body by mounting the interior door parts on the skeleton and then mounting the inner door panel on the skeleton. This vehicle door construction permits a less laborious assembly of the side door and enhances serviceability.

Method of assembling a vehicle door

Growing community of inventors

Hiroshima, Japan

Nobutaka Tanaka