Precision injection molding and the common points of precision injection molding

The characteristics of precision injection molding is: the size of the injection molded parts with high precision, small tolerance. To achieve the requirements of precision injection conditions must be met:
(1) the mold material is better, rigid, cavity dimension precision and template between positioning accuracy is higher, lower surface roughness.
(2) to adopt precision injection molding machine.
(3) to adopt precision molding process. (
4) to choose suitable for precision injection molding process of the material. Commonly used precision injection molding materials have several: POM, POM = CF (carbon fiber), PNM = GF (glass fiber), PA \ FRPA66 (enhanced PA), PC, etc.

Precision injection process can ensure the size precision injection molding is the important way to control the shrinkage of injection molded parts, including: thermal contraction, disguised contraction of molded parts, orientation and compressed contraction and elastic recovery.

Common injection molding features are: precision is not high, the size of injection molded parts are typically can be assembled into standard, requirements for the appearance of the injection molded parts is relatively high, if necessary, may use the second processing (oil, for example) to improve the appearance of defects. Ordinary injection molding don't need to use special precision injection molding machine, also do not need to specially designated materials, general common thermoplastics can be used to production. So ordinary injection molding technology is widely used in modern plastic industry.