How to solve shrinkage problems in injection moulding?

Injection moulding is a common method of manufacturing moulded parts in the industry. Due to the complex structural design often encountered in the injection moulding process, resulting in thicker parts of the injection moulded parts because of the lack of melt glue replenishment during cooling is easy to cause shrinkage concave and internal shrinkage and other defects, these defects are usually called injection moulded parts shrinkage, encounter shrinkage problems regardless of increasing the pressure or increase the water inlet, can not be solved, so the following to introduce you to a few Improve the solution to the problem of shrinkage in Shanghai injection molding process.
Pictures of how to solve the shrinkage problem in injection molding processing

1, Shorten the cooling time

Shorten the cooling time of the injection molded parts can make it under the high temperature out of the mold in advance, the temperature of the outer layer of the finished product can be maintained at a high temperature but not in a hardened state, so the temperature difference between inside and outside will not be too large in favor of the overall shrinkage, the overall shrinkage is unchanged, the smaller the concentration of shrinkage the smaller the probability of shrinkage and shrinkage concave inside the injection molded parts, thus reducing the shrinkage of injection molded parts, so pay attention to the temperature of the surface of the finished product and the degree of hardening, relatively Shorten the cooling time can effectively improve the shrinkage problem.

2, Extend the injection time

Some products in the production can not directly shorten the cooling time, so you can take to extend the injection time band instead, in the injection molding of the product is prone to defects in the parts of the injection, through a long period of uninterrupted injection means to avoid the lack of melt glue to make the product surface depression, improve the problem of shrinkage of injection molded parts depression.

3, Gas assisted injection moulding

Extended injection can improve the problem of shrinkage but for some materials are prone to surface shrinkage, encounter such situations can be used gas-assisted injection molding method, through the introduction of high-pressure gas into the thick-walled parts, the internal hollow cross-section to complete the process of gas pressure, can effectively eliminate the shrinkage of plastic molding phenomenon, while the finished plastic parts of low internal stress and high lightness, plastic performance is more excellent.

The above is the Shanghai injection molding process to solve the problem of plastic molding shrinkage of the three practical methods, the face of plastic products in home appliances, automobiles, machinery and electronics and other fields of common application, injection molding manufacturers to meet the needs of various industries, product production must be more attentive and meticulous, pay attention to a variety of problems that may lead to product defects and find effective ways to solve them, and strive to product quality qualified production efficiency higher.