A mold system for thermoplastic resin thick-walled products

Abstract

The invention relates to a thermoplastic resin thick walled casting product mold system. The system comprises a mold unit and a temperature change unit connected to the mold unit. The mold unit comprises a fixed mold plate (1) and a movable mold plate (2) matching with the fixed mold plate (1). The temperature change unit comprises a heating pipe (1), an air pump (12) and pipes connected to the mold unit. The temperature change unit controls a temperature of the mold unit. Compared with the existing mold system, the thermoplastic resin thick walled casting product mold system can process a thick walled casting product and low flow resin, has concentrated stress, does not influence mold clamping force, does not easily produce flash, and is provided with a cold slug well so that weld mark is reduced furthest and the whole molding period of the thick walled casting product is shortened.

Description

technical field [0001] The invention relates to the field of injection compression molding, in particular to a mold system for thick-walled thermoplastic resin products. Background technique [0002] Injection compression molding (icm) is an advanced form of traditional injection molding. It increases the stream length / wall thickness ratio of injection molded parts; employs lower clamping force and injection pressure; reduces material internal stress; and increases process productivity. Injection compression molding is suitable for products made of various thermoplastic engineering plastics, such as: large-sized curved parts, thin-walled, miniaturized parts, optical lenses, and parts that require good anti-shock characteristics. [0003] In recent years, injection compression is being widely used in thin-walled products such as light guide plates. It is rarely used in thick-walled products. In addition, thick-walled products are prone to shrinkage, and shrinkage of plastic ...

AI Technical Summary

Problems solved by technology

We often encounter the situation that the shrinkage problem cannot be solved no matter how the pressure is increased, the water inlet is increased, and the injection time is prolonged.

In addition, for thick-walled products, especially low-flow resins, which are prone to thermal degradation under high-speed and high-pressure conditions, there are few adjustments in molds at present.

Patent CN101218084B discloses a mold for injection compression molding that can maintain the position of the injection compression molded product in the molding space after molding the injection compression molded product. Large, easy to cause flash

Patent CN101274478B discloses an injection compression molding mold of a light guide plate and an injection compression molding method of a light guide plate that can be well transferred to form different light guide plates by replacing modules. The resin has excellent applicability, but it has low applicability to thick-walled products and low-flow resin that is easy to decompose

Patent 201210499386.6 discloses an injection mold, including a front mold core, a rear mold core that cooperates with the front mold core to form a mold cavity, and an ejection mechanism that cooperates with the rear mold core. The ejection mechanism includes an ejector rod , the rear mold core is provided with a first groove, the ejector pin is embedded in the first groove and cooperates with the front mold core to form an inlet runner, and the inlet runner has an inlet mold formed on the inner side of the mold cavity mouth, but this kind of mold has excellent effect on resin with small shrinkage rate, but it is prone to shrinkage problem on resin with poor fluidity and thick-walled products

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