Description
When processing injection molds, they are generally formed in batches. Therefore, we attach great importance to the mold injection molding technician methods and processes. If the injection molds are not processed according to the specified requirements, the injection molds will be damaged. To this end, the editor will introduce to you the process analysis of mold injection molding processing methods:
1. The raw materials generally do not need to be dried. In some cases, they can be dried at 80°C for 2 hours.
2. The molding temperature range is large, and the heating, melting and solidification speed is fast, so the molding cycle is generally short; Temperature parameter: The barrel temperature is about 200°C. If the material temperature is too high, silver threads will easily appear, while if the material temperature is too low, the transparency will be poor.
3. Mold temperature control: The mold temperature is generally 50-80°C.
4. GPPS has very good fluidity, and high pressure is not required in beer molding (usually the injection pressure is about 10Mpa), so as not to increase the internal stress of the plastic parts if it is too high, which may lead to cracking (especially after the paint decoration process)
5. The injection speed should be appropriately high to reduce the water mark. However, because the injection speed is greatly affected by the injection pressure, too high a speed may cause problems such as mold sticking or mold sticking during ejection, whitening and cracking during ejection
6. Appropriate back pressure: If the back pressure is too low, air will easily escape when the screw rotates. The density of the particles in the barrel will be small, and the plasticizing effect of the rubber particles will be poor, which will affect the apparent quality of the plastic parts (generally the back pressure is 10-20kg) /cm2);g) The general design of the fine nozzle on the mold is 0.8-1.0mm.h) Glass fiber reinforced PS-GF30, the barrel temperature is 180~275, the mold temperature is 20~80, and the molding shrinkage is 0.1~0.2. Density 1.29/cm3.