When the injection mold is processed, it is generally formed in batches, so we attach great importance to the method and process of the mold injection technology. If the injection mold is not processed according to the specified requirements, the injection mold will be damaged. To this end, the editor will introduce the process analysis of the mold injection processing method:
1. The raw materials generally do not need to be dried. In some cases, bake at 80°C for 2 hours;
2. The molding temperature range is large, and the heating melting and curing speed is fast, so the molding cycle is generally short; temperature parameters: the barrel temperature is about 200 ℃, the material temperature is too high, and the silver wire is easy to appear, and the material temperature is too low, the transparency will be poor ;
3. Mold temperature control: mold temperature is generally 50-80℃;
4. The fluidity of GPPS is very good, and high pressure (usually about 10Mpa injection pressure) is not required in beer plastics, so as not to increase the internal stress of the plastic parts due to excessive pressure, which may lead to cracking (especially after the paint decoration process);
5. The injection speed should be appropriately high to reduce the water pattern, but because the injection speed is greatly affected by the injection pressure, too high a speed may cause problems such as draping or sticking of the mold during ejection and top white cracking during ejection; < br> 6. Appropriate back pressure: If the back pressure is too low, the screw will easily overflow into the air, the density of the particles in the barrel is small, the plasticizing effect of the rubber particles is not good, and the apparent quality of the plastic parts will be affected (generally, the back pressure is 10-20kg). /cm2); g) The narrow nozzle on the mold is generally designed to be 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 rate is 0.1~0.2. Density 1.29/cm3.