The temperature in the injection mold is not uniform at various points, and it is also related to the time point in the injection cycle. The function of the mold temperature machine is to keep the temperature constant between 2min and 2max, that is to say, to prevent the temperature difference from fluctuating up and down in the production process or gap. The following control methods are suitable for controlling the temperature of the mold: controlling the fluid temperature is the most commonly used method, and the control accuracy can meet the requirements of most situations. Using this control method, the temperature displayed at the controller and the mold temperature are not consistent; the mold temperature fluctuates considerably because the thermal factors affecting the mold are not directly measured and compensated for. These factors include changes in injection cycle, injection speed, melt temperature and room temperature. The second is the direct control of mold temperature. This method is to install a temperature sensor inside the mold, which is only used when the mold temperature control accuracy is relatively high. Key features of mold temperature control include:

The temperature set by the controller is consistent with the mold temperature; the thermal factors affecting the mold can be directly measured and compensated. Typically, mold temperature stability is better than by controlling fluid temperature. In addition, mold temperature control has better repeatability in production process control. The third is joint control. Combined control is a combination of the above methods, which can control the temperature of the fluid and the mold at the same time. In the joint control, the position of the temperature sensor in the mold is extremely important. When placing the temperature sensor, the shape, structure and position of the cooling channel must be considered. In addition, the temperature sensor should be placed in a place that plays a decisive role in the quality of the injection molded part. There are many ways to connect one or more mold controllers to an injection molding machine controller. It is best to use a digital interface from the viewpoint of operability, reliability and anti-interference.

The heat balance of the injection mold controls the heat conduction of the injection molding machine and the mold is the key to the production of injection molded parts. Inside the mold, the heat brought by the plastic (such as thermoplastic) is transferred to the material and the steel of the mold by thermal radiation, and to the heat transfer fluid by convection. In addition, heat is transferred to the atmosphere and formwork by thermal radiation. The heat absorbed by the heat transfer fluid is taken away by the mold temperature machine. The thermal balance of the mold can be described as: P=Pm-Ps. In the formula, P is the heat taken away by the mold temperature machine; Pm is the heat introduced by the plastic; Ps is the heat emitted by the mold to the atmosphere. The purpose of controlling the mold temperature and the effect of the mold temperature on the injection molded parts In the injection molding process, the main purpose of controlling the mold temperature is to heat the mold to the working temperature, and the second is to keep the mold temperature constant at the working temperature. If the above two points are successful, the cycle time can be optimized, thereby ensuring the stable and high quality of the injection molded parts. Mold temperature affects surface quality, fluidity, shrinkage, injection cycle time, and deformation. Excessive or insufficient mold temperature will have different effects on different materials. For thermoplastics, a higher mold temperature generally improves surface quality and flow, but increases cooling time and injection cycle time. Lower mold temperature will reduce shrinkage in the mold, but will increase the shrinkage of the injection molded part after demolding. For thermosets, a higher mold temperature generally reduces cycle time, which is determined by how long it takes for the part to cool. In addition, in the processing of plastic, a higher mold temperature will also reduce the plasticizing time and reduce the number of cycles.

PLATE WINDOW TYPE INTEGRATED MOLDING PALLET (CAN BE BUILT IN STEEL PIPE)