Patent ID: 7332215

Claim:
A resin-molded component formed by injection-molding thermoplastic resin in which crystallization is facilitated in a resin flowing direction, said component comprising: an integral five-layer cross-sectional structure formed entirely of thermoplastic resin with built in unfoamed skin layers formed as front and rear surfaces of the component, a first foaming layer and a second foaming layer respectively formed under said unfoamed skin layers of the front and rear surfaces, having substantially cylindrically-shaped foaming cells, the foaming cells having a length of at least twice a diameter thereof in the resin flowing direction on molding, and an unfoamed core layer positioned between said first foaming layer and said second foaming layer; wherein the thermoplastic resin is substantially composed of a polyolefin composition containing ultra-high molecular polyolefin; wherein, said first and second foaming layers are formed within the integral structure by dissolving carbon dioxide gas at a predetermined pressure within the thermoplastic resin when molded; and wherein said component has a cone shape with a small diameter portion at one end and a large diameter portion at an opposite end, and said foaming cells are arranged such that the length thereof extends in a direction between the small diameter portion and the large diameter portion.