The Temperature In The Air Cooler Mould Is Not Uniform At All P

• Posted by xiu umin 21 April 2020 - Filed in Other - #Air Cooler Mould  - 73 views

   

  The temperature in the Air Cooler Mould is not uniform at all points, which is also related to the time point in the injection cycle. Using this control method, it is shown that the temperature of the controller is not consistent with the mould temperature. The temperature fluctuation of the mould is quite large because the thermal factors affecting the mould are not directly measured and compensated. These factors include the change of injection cycle, injection speed, melting temperature and room temperature. The second is the direct control of mould temperature. This method is to install a temperature sensor inside the mould, which will only be adopted when the mould temperature control accuracy is required to be relatively high.

  The main characteristics of air cooler mould temperature control include: the temperature set by the controller is consistent with the mould temperature; The thermal factors affecting the mould can be directly measured and compensated. In general, the stability of mould temperature is better than by controlling the fluid temperature. In addition, the repeatability of mould temperature control in production process control is good. The third is joint control. Joint control is a combination of the above methods, which can control the temperature of fluid and mould simultaneously. In the joint control, the position of the temperature sensor in the mould is extremely important. When placing the temperature sensor, the shape, structure and the 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 injection moulded parts. There are many ways to connect one or more mould temperature machines to the controller of the injection moulding machine. It is best to use digital interface from the viewpoint of operability, reliability and anti-interference.

  For thermoplastics, a higher air cooler mould temperature usually improves surface quality and fluidity, but prolongs cooling time and injection cycle. A lower mould temperature will reduce the shrinkage in the mould, but will increase the shrinkage of the injection moulded parts after demoulding. For thermosetting plastics, a higher mould temperature usually reduces the cycle time, which is determined by the time required for cooling the parts. In addition, in plastic processing, a higher mould temperature will also reduce plasticizing time and cycle times.

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