Nippon Steel Chemical Co., Ltd.

Usm Corporation

Akira Aiba

Akifumi Hayakawa

Kiyoshi Fukushima

Eiki Orihara

Tokuo Yoshimura

Kunio Hagiwara

A polyamide resin composition which comprises 20 to 80 wt % of polyamide resin and 80 to 20 wt % of inorganic fibers, 85 to 15 wt % of said inorganic fiber being glass fiber and remaining 15 to 85 wt % being ground mineral fiber having an aspect ratio of 5 to 100. The composition has high strength and high modulus of elasticity and is suitable for molding. The composition provides moldings having good surfaces.

Polyamide resin composition

Mould assembly for foam moulding of plastic materials, which comprises stationary and movable dies and an auxiliary die plate device between the stationary and movable dies. A gas passage is formed for introducing pressurized inert gas into the mould cavity. The auxiliary die device comprises separated inner and outer auxiliary dies both being spring biased toward the stationary die. O-ring seals are disposed between the opposite surfaces of the outer auxiliary die and the stationary and movable dies.

Mould assembly for foam moulding of plastic materials

This invention relates to an improved injection foam molding method in which a foamable mixture of molten synthetic polymer resin and a chemical blowing agent in unfoamed condition is injected into a gas-pressurized expandable mold having a mold section movable for expanding the mold cavity to a position in which the surface of that section is in registry to the surface of another mold section, in which process the mold is filled under conditions resisting foaming of the material prior to filling of the mold and a novel controlled time sequence effective to form a fine mold crease line is employed in releasing the gas pressure and expanding the mold to allow foaming of the mixture into conformity with the mold surface.

Growing community of inventors

Kawasaki, Japan

Akira Aiba