During the injection molding process, injection molds are almost always formed in batches. At this time, the processing method and process of injection molds are particularly important. Failure to process according to the requirements of the rules is likely to damage the injection molds. For this reason, Changzhou Mingchuang Plastic Industry has provided a process analysis of injection mold processing methods: generally, dry materials are not required. In some cases, they will be baked at 80 ℃ for 2 hours; The molding temperature scale is large, and the heating, melting, and curing speed are fast, and the molding cycle is generally short; Temperature parameter: The temperature of the material barrel is around 200 ℃. If the material temperature is too high, silver threads are prone to appear. If the material temperature is too low, it will lead to poor transparency
Injection mold temperature control: The mold temperature is generally 50-80 ℃; GPPS has good flowability and does not require high pressure to be applied to beer plastic (usually injection pressure is about 10Mpa), to avoid excessive and add internal stress to rubber parts that may cause cracking (especially after paint decoration); Properly increasing the injection speed can weaken the watermark, but due to the injection pressure greatly affecting the injection speed, too high a speed may lead to problems such as sticking during ejection or demolding, and white cracks during ejection
Appropriate back pressure: If the back pressure is too low, the screw can easily overflow into the air, the density of particles in the barrel is very small, and the plasticizing effect of rubber particles is not good, affecting the apparent quality. Rubber parts (back pressure generally 10-20kg/cm2); g) The mold is generally designed with fine nozzles ranging from 0.8 to 1.0mm. h) Glass fiber reinforced PS-GF30 with a barrel temperature of 180 ° C? 275, mold temperature is 20? 80, with a reduction rate of 0.1? 0.2. Density is 1.29/cm3.
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