What is the temperature used in plastic injection molding pr

What is the temperature used in plastic injection molding process when melting plastic materials? Explain why we need high injection speed injection molding process.

Solution

When molding Plastic Materials , resin temperature should be generally about 240 to 265. Liquidity will be
better as the temperature rises, but extremely high temperature will accelerate heat degradation which will end
up with physicality deterioration of the molded article.

Injection speed
In the case of thin molded product or multi-cavity molded product which severe size precision is required,
faster injection speed is better. In contrast, slower injection speed is better for thick molded product. Also, the
program control of injection speed is effective to resolve the jetting and the flow mark.