When molding thin-walled products, a specially designed mold for thin-walled products is generally required. Compared with standardized molds for conventional products, molds for thin-walled products have undergone major changes in mold structure, pouring system, cooling system, exhaust system and demoulding system. Mainly manifested in the following aspects:

A, Mold structure: In order to withstand the high pressure during molding, thin-walled molding molds must have greater stiffness and strength. Therefore, the moving and fixed templates of the mold and their supporting plates are heavier and generally thicker than the templates of traditional molds. In addition, high-speed injection speed increases the wear of the mold, so the mold must use higher hardness mold steel, and the hardness of high-wear and high-erosion areas should be greater than HRC 50.

B, Gating system: To ensure sufficient pressure to fill the thin mold cavity, the pressure drop in the runner system should be minimized. For this reason, the flow channel design is larger than the traditional one, and the residence time of the melt must be limited to prevent resin degradation. When a mold has multiple cavities, the balance requirements of the gating system are much higher than those of conventional molds.

C, Cooling system: In order to ensure the dimensional stability of the product and control shrinkage and warpage within an acceptable range, it is necessary to strengthen the cooling of the mold and ensure balanced cooling. Better cooling measures include using unclosed cooling lines in the core and cavity modules, increasing the cooling length, which can enhance the cooling effect, and adding high-conductivity metal inserts where necessary to speed up heat conduction.

D, Exhaust system: Thin-wall injection molding molds generally need to have good exhaust properties, due to the short filling time and high injection speed, it is very important to fully exhaust the mold. Gas is usually discharged through the core, ejector rod, stiffeners, studs and parting surfaces.

E, Demoulding system: Because the walls and ribs of thin-walled products are very thin, they are very easy to damage, and the shrinkage along the thickness direction is very small, making it easy to bond the reinforcing ribs and other small structures. At the same time, the high holding pressure makes the shrinkage more rapid, small.