Do you know the main process parameters of injection molding parts?

- Mar 30, 2018-

1.Vertical injection molding machine barrel temperature.The melting temperature is very important, and the temperature of the ejector used is only a guide.Glue temperature can be measured at the nozzle or by air injection.The temperature of the ejector depends on the melt temperature, screw speed, back pressure, injection volume and injection cycle.If you have no experience in processing a particular grade of plastics, start with a minimum setting.For ease of control, the cartridge is divided, but not all are set to the same temperature.If the operating time is long or operates at high temperatures, set the temperature in the first zone to a lower value, which will prevent premature melting and streaming of plastics.Make sure the hydraulic oil, hopper seal, die and cylinder are at the correct temperature before injection.2.Melting material temperatureMelt temperature plays a major role in the fluidity of melt. Because plastics have no specific melting point, the so-called melting point is a temperature section in a melting state, and the structure and composition of the molecular chain of plastic are different, so the effect on the fluidity of plastic molecular chain is also different.The effect of temperature on rigid molecular chain is obvious, such as PC-PPS, and flexible molecular chain such as 1 / PA-PPPE is not obvious by changing temperature, so the reasonable injection temperature of vertical injection molding machine should be adjusted according to different materials.3.Mold temperature of vertical injection molding machine assembly.Some plastic materials require higher mold temperature due to high crystallization temperature and slow crystallization rate, while others require higher or lower temperatures for vertical injection molding machines due to the control of size and deformation, or the need for demoulding, such as a PC generally requiring more than 60 degrees.In order to achieve a better appearance and improve the fluidity of PPS, the mold temperature sometimes needs more than 160 degrees, so the mold temperature of the vertical injection molding machine in use can not be estimated to improve the appearance, deformation, size and mould of the product.4.Injection pressure.The melt overcomes the resistance required to advance and directly affects the size, weight and deformation of vertical injection molding machine products. Different plastic products require different injection pressures for vertical injection molding machines. For materials such as PAA PP,Increasing the pressure of the vertical injection molding machine will significantly improve its fluidity.The size of the injection pressure determines the density of the product, that is, the appearance of luster.It has no fixed value, and the harder the mold is filled, the greater the injection pressure.