How to make quality medical injection molding producdts

The influence of medical mold temperature adjustment on the quality of medical mold products is shown in the following aspects:

• (1) deformation. The stable temperature and uniform cooling rate of the medical mold can reduce the deformation of the medical mold product. For medical products with inconsistent wall thickness and complicated shapes, warping and deformation often occur due to uneven shrinkage. Therefore, a suitable cooling system must be adopted to make the temperature of the various parts of the medical mold cavity and the core basically Keep it uniform so that the plastic melt in the cavity can solidify at the same time.
• (2) Dimensional accuracy of medical molds. Using the temperature adjustment system to keep the temperature of the medical mold constant can reduce the fluctuation of the molding shrinkage rate of the product and improve the stability of the dimensional accuracy of the medical mold product. Where possible, lower mold temperatures can help reduce molding shrinkage. For example, for crystalline plastics, because the mold temperature is lower, the crystallinity of the product is lower, and lower crystallinity can reduce the shrinkage rate. However, low crystallinity is not conducive to the dimensional stability of the product. From the perspective of dimensional stability, it is necessary to appropriately increase the temperature of the medical mold to make the medical product crystallize uniformly.
• (3) Mechanical properties of medical molds. For crystalline plastics, the higher the crystallinity, the greater the stress cracking tendency of the product, so from the perspective of reducing stress cracking, it is advantageous to reduce the temperature control. However, for high-viscosity amorphous plastics such as polycarbonate, the stress cracking tendency is related to the internal stress in the product. Increasing the medical mold temperature will help reduce the internal stress in the product, which will reduce its stress cracking tendency.
• (4) Surface quality of medical molds. Increasing the temperature of the medical mold can improve the surface quality of the product. Obvious weld lines are produced, which leads to an increase in the surface roughness of the medical mold product. The above several aspects have contradictory requirements on the temperature of the medical mold, focusing on meeting the main performance requirements of the medical mold products.