Precision injection molding versus general injection molding

Precision injection molding is characterized by

The dimensions of injection molded parts require high precision and small tolerance.

To achieve the requirements of precision injection molding, the following conditions must be met.

1, the mold material should be good, rigid enough, cavity size accuracy, finish and positioning accuracy between the template should be high.

2、Precision injection molding machine must be used.

3、Precision injection molding process should be adopted.

4, to use materials suitable for precision injection molding process.

Most of the commonly used precision injection molding materials are as follows.

POM, POM + CF (parameters | pictures) (carbon fiber), POM + GF (glass fiber), PA, FRPA66 (reinforced PA), PC, etc.

The important method to ensure the dimensional accuracy of injection molded parts in the process of precision injection molding is to control the shrinkage problem of injection molded parts, among which are: thermal shrinkage of injection molded parts, dislocation shrinkage, orientation shrinkage, and compression shrinkage and elastic recovery.

The characteristics of general injection molding are

The requirements for dimensional accuracy of injection molded parts are not high, and generally the standard is that they can be assembled. The requirements for the appearance of injection molded parts are relatively high, and secondary processing (such as oil spraying) may be used to improve the defects in appearance when necessary.

General injection molding does not require a special precision injection molding machine, nor does it require a special specified material, generally common thermoplastics can be used to produce. Therefore, common injection molding process is also widely used in modern plastic industry.