First, due to the amorphous material of the upvc profile, the hygroscopicity is small, but in order to improve its flow profile and prevent the occurrence of air bubbles, it should be dried first
Second, because upvc profiles have poor fluidity during molding, they are easily decomposed, especially when exposed to steel at high temperatures, metals such as copper are more easily decomposed. The decomposition temperature is 200 ° C, and the decomposition is accompanied by corrosion and irritating gases produce
Third, the temperature range of upvc profiles is small during molding, and the molding and decomposition temperatures are very close, so the temperature of the material must be strictly controlled
Fourth, when using screw injection and straight-through nozzles, the aperture should be larger, and there should be no stagnation in the dead corner. If there is stagnation, it must be cleaned in time.
Fifth, for the requirements of the mold, the gate system of the mold should be short and thick, the gate section should be large, there should be no stagnation in the dead corner, the mold should be cooled after use, and the surface should be chrome-plated