1. Barrel temperature: The melt temperature is very important, and the temperature of the shot cylinder used is only a guide. The melt temperature can be measured at the nozzle or using the air jet method. The temperature setting of the injection cylinder depends on the melt temperature, screw speed, back pressure, injection volume and injection molding cycle. If you have no experience in processing a specific grade of plastic, please start with the lowest setting. For ease of control, the shot cylinders are divided into zones, but not all are set to the same temperature. If the operation time is long or operating at high temperature, please set the temperature of the first zone to a lower value, this will prevent the plastic from melting prematurely and shunting. Before the injection molding starts, make sure that the hydraulic oil, hopper seal, mold and injection cylinder are at the correct temperature.
2. Melt temperature: The melt temperature plays a major role in the flow properties of the melt. Since the plastic has no specific melting point, the so-called melting point is a temperature segment in the molten state. The structure and composition of the plastic molecular chain are different, so it flows The influence of properties is also different. Rigid molecular chains are significantly affected by temperature, such as PC, PPS, etc., while flexible molecular chains such as PA, PP, PE and other fluidity are not obvious by changing temperature, so they should be adjusted according to different materials Correct the temperature of injection molded parts.
3. Mold temperature: Some plastic materials require higher mold temperature due to high crystallization temperature and slow crystallization speed, and some require higher or lower temperature due to size and deformation control or demoulding requirements, such as PC Requires more than 60 degrees, and in order to achieve a good appearance and improve fluidity, PPS sometimes requires a mold temperature of more than 160 degrees. Therefore, the mold temperature has an inestimable effect on improving the appearance, deformation, size and rubber mold of the product.
4. Injection pressure: Melt overcomes the resistance required for advancement and directly affects the size, weight and deformation of the product. Different plastic products require different injection pressures. For materials such as PA and PP, increasing the pressure will make it fluid. Significantly improved, the injection pressure determines the density of the product, that is, the appearance of gloss. It has no fixed value, and the more difficult it is to fill the mold, the higher the pressure of the injection molded part.
