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Liaoning EO Technology Co.,Ltd

PVC Properties And Injection Molding Technology

PVC materials because of cheap, and innate to have anti-inflammatory properties, and strong, strong resistance to chemical ability, shrinkage rate of 0.2-0.6%, products in electrical appliances, machinery, construction, daily necessities, toys, packaging applications increasingly extensive, for the characteristics of PVC materials, analysis of product injection process as follows:
The characteristics of PVC material
PVC thermal stability is poor, forming temperature and decomposition temperature close, liquidity is poor, appearance easy to form bad defect, PVC material heat resistance is poor, the most easy to scorch, produce acid gas and then corrosion mold, when processing can add plasticizing agent to increase its fluidity, the general need to add additive use, its strength, electrical insulation, drug-resistant character good.
Second, mold and gate design
In order to shorten the injection molding cycle, the shorter the nozzle, the better, the transverse plane to the garden, nozzle mouth diameter of 6 mm minimum, into the cone, the internal angle of 5 degrees, preferably to add cold material wells, cold material wells can prevent the melting of poor semi-solid materials into the mold cavity, and such materials will affect the surface of the modification and product strength. The draft angle should be between 0.50 and 10 to ensure that there is sufficient exhaust equipment in the cavity, the commonly used vent hole size is 0.03-0.05mm deep, 6mm wide, or the peripheral clearance of each thimble is 0.03-0.05mm.
The mould is made of stainless steel or hard chromium plated. 

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