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2022

Mold injection molding mechanic method and process

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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 mechanic. If the injection mold is not processed according to the specified requirements, the injection mold will be damaged. To this end, Xiaobian to introduce the mold injection molding processing method process analysis

1, raw materials generally do not need to dry, individual cases 80 ℃ baking 2 hours;

2. The molding temperature range is large, the heating melting and curing speed is fast, so the molding cycle is generally short; Temperature parameters: the temperature of the barrel is about 200 ℃, and the material temperature is too high to appear silver wire, and the material temperature is too low to make the transparency Poor;

3. Mold temperature control: the mold temperature is generally 50-80 ℃;

4. GPPS has good fluidity, and high pressure (usually about 10Mpa injection pressure) is not required in beer plastic, so as not to increase the internal stress of rubber parts due to excessive pressure-which may lead to cracking (especially after painting decoration process);

5. The injection speed is appropriately high to weaken the water lines. However, due to the great influence of injection pressure on the injection speed, too high speed may lead to problems such as front-to-front or mold sticking during mold ejection and top-white top crack during ejection;

6. Appropriate back pressure: If the back pressure is too low, air is easy to overflow when the screw rotates, the density of the particles in the barrel is small, and the plasticizing effect of the particles is not good, which will affect the apparent quality of the rubber parts (generally, the back pressure is 10-20kg/cm2); G) the fine nozzle is generally designed on the mold for 0.8-1.0mm h) glass fiber reinforced PS-GF30, the cylinder temperature is 180-275 and the mold temperature is 20-80, molding shrinkage 0.1~0.2. Density 1.29/cm3.

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