Chung Yuan Christian University

Jen-An Chang

Shia-Chung Chen

Chia-Yen Tseng

Shyh-Shin Hwang

Ping-Shun Hsu

Yu-Zeng Lin

A counterpressure/temperature control apparatus, comprises: a mold, having a runner and an air passage, both coupled to a mold cavity inside the mold; a logic control valve, coupled to the air passage for controlling a high-temperature gas or/and a counterpressure gas to flow in and out the mold cavity; a counterpressure gas supplying device, for supplying the counterpressure gas to the mold cavity through the logic control valve; and a high-temperature gas supplying device, for supplying the high-temperature gas to the mold cavity through the logic control valve; wherein the mold cavity is heated by the high-temperature gas, while subjecting the same to a counterpressure provided from the counterpressure gas supplying device during an injection molding process, and thereby, not only the surface quality of a product resulting from the injection molding process can be improved, but also the size of foams and the distribution evenness thereof are enhanced.

Apparatus for controlling counterpressure and temperature in mold cavity

A mold heating/cooling structure for a mold configured with a die base and an insert, comprising: a heat insulating layer, disposed surrounding a die impression of the die base for insulating the heat conduction between the die base and the insert; a magnetic powder layer, disposed against the heat insulating layer; a coil, being disposed on the magnetic powder layer in a manner that it is circling from the outside in toward the center of the magnetic powder layer; and a cooling plate, configured with a plurality of second fluid channels provided fro a fluid to flow therein. With the aforesaid structure, the insert can be heated directly by the coil the it is subject to a high-frequency current, and the heated coil as well as the insert can be cool down with high efficiency as soon as the fluid is fed into the second fluid channels.

Mold heating/cooling structure

A gas-assisted mold surface heating system is disclosed, which comprise: an air supply, for providing air with a flow rate larger than 300 L/min; a heater, for heating air to a temperature higher than 400&#xb0; C.; a mold, configured with a mold cavity, an inlet and an outlet; and an air storage tank; wherein, the inlet is connected to the heater through a pipeline for allowing the air from the air supply to flow into the cavity after being heated by the heater and thus to be for heating up the surface of the mold cavity while the heated air is being enabled to flow out of the cavity through the outlet and into the air storage tank. With the aforesaid system, surface temperature of the mold cavity can be raised to a point higher than a glass transmission point in a short period of time.

Gas-assisted mold surface heating system

The present invention relates to a coaxial cooling/heating coil structure and a mold configured with the same, in which the coaxial cooling/heating coil is comprised of: a frame, configured with a cooling channel having an inlet, provided for a cooling water to flow therein, and an outlet, provided for discharging the cooling water therefrom; and a heat-conducting coil, disposed inside the cooling channel. The coaxial cooling/heating structure is fitted to a mold to be used for enhancing the preheating efficiency of the mold while improving the time required for cooling the mold.

Growing community of inventors

Taoyuan County, Taiwan

Jen-An Chang