How to solve the shrinkage problem of thick-walled plastic parts?
The shrinkage of plastic products is caused by insufficient feeding of melted plastic when the thicker parts of the product are cooling. After a long period of practice and accumulation, engineers have developed a set of effective techniques to deal with this injection molding problem.
1. On the premise of ensuring that the product is not deformed, shorten the cooling time as much as possible to allow the injection product to be ejected early at high temperatures. In this state, the outer temperature of the injection parts is still high, and the temperature difference between the inside and outside of the product is not large, which is beneficial to the cooling shrinkage.
2. Under the above operation, the method of extending the injection time to replace the cooling time to improve the outer surface of the plastic parts.
The shrinkage of thick-walled products can also be optimized by adding anti-shrinking agents and a gas-assisted molding system to improve the shrinkage shows on the products. Transparent products cannot use shrink-proof agents to solve the problem of product shrinkage. Gas-assisted devices include nitrogen generator and booster systems, pressure control units, and air intake components. At present, the gas-assisted process can be fully integrated with the traditional injection molding process and now is one of the effective auxiliary devices in the injection molding industry.
