METHOD OF MOLDING RESIN MOLDED ARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method of molding a resin molded article by which the molded article required to have high mechanical strength and dimensional accuracy for each portion can be manufactured with high flexibility of the shape through a relatively simple process, using a crystalline polymer resin.

SOLUTION: The method of molding the resin molded article comprises: a first injection step of injecting the molten liquid of the crystalline polymer resin in a short shot state into a molding die set to a state in which a movable die is separated from a fixed die from a clamping position; a crystallization step of clamping the movable mold at high speed so that the molten liquid stretches at a rate of strain which is equal to or above critical stretching strain rate while the temperature of the molten liquid is equal to or below the melting point and equal to or above the crystallization temperature thereby obtaining the molten liquid in an oriented state and crystallizing the molten liquid while keeping the oriented state; and a second injection step of injecting the molten liquid of additional resin around an intermediate molded article molded in the crystallization step, in the above molding die or another molding die in order to mold the peripheral part of the intermediate molding to a final shape.

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