1. Barrel temperature: The melt temperature is very important, and the injection cylinder temperature used is only instructive. The melt temperature can be measured at the nozzle or by air jet. The temperature setting of the injection cylinder depends on the melting temperature, screw speed, back pressure, injection volume and injection cycle time. If you don't have experience with a particular grade of plastic, start with the lowest setting. For ease of control, the injection cylinders are divided into zones, but not all are set to the same temperature. If operating for a long time or operating at high temperatures, set the temperature of the first zone to a lower value, which will prevent premature melting and shunting of plastics. Before the injection molded part begins, make sure that the hydraulic oil, hopper sealer, mold and injection cylinder are at the correct temperature.
2. Melt temperature: melt temperature plays a major role in the flow performance of the melt, because plastic has no specific melting point, the so-called melting point is a temperature segment in a molten state, the structure and composition of the plastic molecular chain are different, so the impact on its fluidity is also different, the rigid molecular chain is more obviously affected by temperature, such as PC, PPS, etc., and flexible molecular chains such as: PA, PP, PE and other fluidity by changing the temperature is not obvious, so it should be adjusted according to different materials to adjust the reasonable temperature of the injection molded parts.
3. Mold temperature: some plastic materials due to high crystallization temperature, slow crystallization speed, need higher mold temperature, some due to the control of size and deformation, or the need for demolding, to higher temperature or lower temperature, such as PC generally requires more than 60 degrees, and PPS in order to achieve a better appearance and improve fluidity, mold temperature sometimes needs more than 160 degrees, so the mold temperature to improve the appearance, deformation, size, rubber mold has an inestimable role.
