Mold, mold temperature regulation method, mold temperature regulation device, injection molding method, injection molding machine, and thermoplastic resin sheet

Abstract

The present invention provides a mold, mold temperature regulation method, mold temperature regulation device, injection molding method, injection molding machine, and thermoplastic resin sheet, the mold made of by certain material can enhance the transferability of the surface of a molded product and can allow the molded product to be taken out immediately after the solidification, whereby molding cycle can be accelerated. In the mold, both a stationary side mold and a movable side mold are mounted within masters, and a cavity face is formed on a release side. A plurality of heating medium passages are bored at a position distant by a given distance from the cavity face. The mold comprises a 15 to 30 mm-thick rectangular bushes formed of a metal having a coefficient of thermal conductivity of 20 to 40 W/(m K), heat insulating plates having a coefficient of thermal conductivity of not more than 5 W/(m K) and held between the masters and the bushes, a pair of heating medium manifolds (mounted on both ends of the anticavity face of the bushes so as to be led to the heating medium passages of the bushes, and a plurality of pressing members for pressing four edges of the bushes to fix the bushes to the masters.

Description

Mold, mold temperature adjustment method, mold temperature adjustment device, injection molding method, injection molding machine, and thermoplastic resin sheet technical field The present invention relates to a mold for an injection molding machine for molding a thin plate made of thermoplastic resin, such as a light guide plate, a diffuser plate, etc., which has an integral body formed in a large number of fine dimples and protrusions in a pattern and more specifically, a mold, a mold temperature adjusting method, a mold temperature adjusting device, an injection molding method, an injection molding machine, and a thermoplastic resin sheet, all of which are combined in cooperation by using a mold made of one material The method is configured to enhance the transferability (transferability) of the surface of the molded article so that the molded article can be removed immediately after curing, thereby speeding up the molding cycle, wherein the material has such a thermal cond...

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Problems solved by technology

The molding method according to a conventional example as described in Japanese Patent No. 3601463 is configured to preheat the cavity surface of the mold to or above the glass transition temperature to obtain good flowability of the resin material at a lower injection rate. The molten resin is injected into the cavity at a high speed, and the mold is cooled, and the molded article is removed from it. As a result, the method has an excellent performance in the fine reproduction rate of the surface of the molded article, but due to a longer molding cycle, it exhibits The problem of low production capacity

Meanwhile, the injection molded article production method according to the conventional example as described in JP-2004-322597A requires a system of three temperature adjustment devices, a cooperative heat medium supply device, a heat medium recovery tank, etc., to control high temperature, medium temperature, and The three types of low-temperature heat media are supplied separately, so the number of devices is large and the control devices are complicated

Also, since the medium-temperature heat medium must be kept supplied for a long time to prevent the temperature rise due to the molten resin in the injection process and the pressure-holding process by keeping the mold at a medium temperature, and since the molded Items take a long time to cool, and the molding cycle time is greatly extended, which significantly increases the amount of heat medium circulation and heat energy consumed

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