Mold for molding, molded article, and molding method of molded article

Abstract

The present invention relates to a molding die, a molded article, and a method for molding the molded article. The object of the present invention is to improve the quality of molded products while achieving cost reduction. The forming mold includes a fixed mold (2) and a movable mold (3) that form a cavity (4) by butting, and an air supply passage (5) for supplying air and a gas discharge passage for exhausting gas are formed on the fixed mold or the movable mold (6) The air supply passage and the gas discharge passage communicate with the chamber, and the molten resin (300) is filled into the chamber while the chamber is kept at a pressure higher than atmospheric pressure by the air supplied from the air supply passage.

Description

technical field [0001] The present invention relates to the technical field of a molding die, a molded product, and a molding method for a molded product that form a cavity by butting a fixed mold and a movable mold. Background technique [0002] Conventionally, there is a molding die in which a cavity is formed by butting a fixed die and a movable die. In such a molding die, a cavity is filled with a molten resin, and the filled molten resin is solidified to form a molded product. [0003] However, when a molded product is molded by a molding die, there is a possibility that an internal mold release agent, an ultraviolet absorber, etc. contained in the molten resin may be generated as a gas from the molten resin filled in the cavity. There is a concern that the gas may contaminate the surface of the molded product or the molding surface of the molding die, and therefore, it is necessary to discharge the gas to the outside of the molding die. [0004] The method described ...

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Problems solved by technology

[0006] However, if the gas is exhausted to the outside of the molding die by vacuum suction, the gas generation from the molten resin is promoted as the pressure of the cavity decreases, so that the exhaust of the gas cannot be performed sufficiently, and the impact of the gas on the molded product or the mold cannot be sufficiently suppressed. The influence of the mold also reduces the forming rate of the molded product

[0007] On the other hand, it is possible to solve the above-mentioned problems by using resin materials such as high-transmittance polycarbonate that generate less gas, but these resin materials are expensive, so there will be a problem of increased manufacturing costs due to molding dies.

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