The cooling methods of the mold temperature machine during operation are divided into direct cooling and indirect cooling. The indirect cooling method separates the cooling circuit from the main circuit, while the direct cooling method involves the cooling circuit directly participating in the main circuit. The water transport type mold temperature machine usually adopts direct cooling method. And for the oil operated mold temperature machine, due to the fact that water and oil cannot be mixed together during the heating process, indirect cooling is usually used, and the method is usually to use a plate heat exchanger for cooling.

As the temperature of the mold temperature machine is usually above 160 ℃, the internal main pipeline circulates high-temperature steam. At this time, the internal pipeline pressure is relatively high. If direct cooling is used, the external water pressure needs to be greater than the internal main pipeline water pressure to enter the main pipeline for cooling. This method is prone to residual risks. Therefore, high-temperature water type mold heaters often use indirect cooling methods.

The advantages and disadvantages of direct cooling: Direct cooling can only be used in situations with lower temperatures, but using direct cooling has a faster cooling speed. The advantages and disadvantages of indirect cooling: Indirect cooling is suitable for high-temperature temperature machines, but the heat exchange speed is slow, and heat will be lost in the heat exchange. Therefore, when the actual temperature of the medium deviates significantly from the set value, we adopt a direct cooling method with a higher cooling capacity.

The purpose of controlling mold temperature and the impact of mold temperature on injection molded parts. In the injection molding process, the main purpose of controlling mold temperature is to heat the mold to the working temperature, and to maintain a constant mold temperature at the working temperature. If the above two points are successfully achieved, the cycle time can be optimized to ensure stable and high-quality injection molded parts. Mold temperature can affect surface quality, fluidity, shrinkage rate, injection molding cycle, and deformation in several aspects.

Excessive or insufficient mold temperature can have different effects on different materials. For thermoplastic materials, a higher mold temperature usually improves surface quality and fluidity, but prolongs cooling time and injection molding cycle. A lower mold temperature will reduce the shrinkage inside the mold, but it will increase the shrinkage rate of the injection molded part after demolding. For thermosetting plastics, a higher mold temperature usually reduces the cycle time, and the time is determined by the time required for the part to cool. In addition, in the processing of plastics, higher mold temperatures can also reduce plasticization time and reduce the number of cycles.