The influence of medical mould temperature adjustment on the quality of medical mould products is manifested in the following aspects:
(1) Deformation. The stable temperature and uniform cooling rate of the medical mould can reduce the deformation of the medical mould 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 mould 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 moulds. Using the temperature adjustment system to keep the temperature of the medical mould constant can reduce the fluctuation of the moulding shrinkage rate of the product and improve the stability of the dimensional accuracy of the medical mould product. Where possible, lower mould temperatures can help reduce moulding shrinkage. For example, for crystalline plastics, because the mould 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 mould to make the medical product crystallize uniformly.
(3) Mechanical properties of medical moulds. 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 mould temperature will help reduce the internal stress in the product, which will also reduce its stress cracking. tendency.
(4) Surface quality of medical moulds. Increasing the temperature of the medical mould 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 mould product. The above several aspects have contradictory requirements on the temperature of the medical mould, focusing on meeting the main performance requirements of the medical mould products.
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