Process Analysis of Injection Mold Processing

Author: MULAN - Plastic Molding Manufacturer

Injection molds are almost all formed in batches during the injection molding process. At this time, the injection mold processing method and process are particularly important. If the processing is not performed according to the specified requirements, the injection mold is likely to be damaged. To this end, Shanghai Mulan Precision provides an analysis of the process flow of the injection mold processing method: ① Usually, there is no need to dry raw materials. In some cases, they will be baked at 80°C for 2 hours; ②The molding temperature range is large, heating, melting, and solidification are fast, and the molding cycle is generally short; Temperature parameters: barrel temperature is around 200°C, material temperature Too high, easy to appear silver wire, material temperature is too low, resulting in poor transparency; ③ injection mold temperature control: mold temperature is generally 50-80 ℃; ④ GPPS has good fluidity, no need to apply high pressure in beer plastic (usually injection The pressure is about 10Mpa), so as not to be too large and increase the internal stress of the rubber parts - it may cause cracks (especially after the paint decoration treatment); ⑤ Properly increasing the injection speed can weaken the watermark, but because the injection pressure will greatly affect Injection speed, so too high a speed may cause problems such as sticking when ejecting or ejecting, and white cracks when ejecting.

⑥Appropriate back pressure: If the back pressure is too low, the screw is easy to overflow into the air, the density of the particles in the barrel is very small, the plasticizing effect of the rubber particles is not good, and the apparent quality is affected. Rubber parts (back pressure is usually 10-20kg/cm2); g) Molds are usually designed with fine nozzles of 0.8-1.0mm. h) Glass fiber reinforced PS-GF30, the cylinder temperature is 180~275, the mold temperature is 20~80, and the shrinkage rate is 0.1~0.2.

The density is 1.29/cm3.