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Design of heating and cooling system Mar 10, 2018

The mold temperature adjustment has two purposes: one is to improve the molding rate and the two is to improve the quality of the products. Injection molding, for most plastic, the plastic is about 200 DEG C to melt into the mold cavity, after curing is reduced to 50~60 DEG C when morwen took out the products. If the temperature difference is not well adjusted, it not only affects the blanking die, but also makes the products warped and dehiscence. The rapid cooling and setting in the mold is an important measure to shorten the molding cycle and improve the production efficiency.

Heating is an aspect of adjusting the temperature of the mold. In order to maintain a certain temperature of the injection, the mold should be heated. In large mold, if the molding distance is longer, the thickness of the plastic part, even the low melting point plastic, should be heated when the initial injection is done, so as to prevent dissatisfaction of the die.

Setting the cooling system in the mold is an effective measure to control the temperature of the die. In order to shorten the molding cycle, it is always desired that the mold temperature is lower, but the mold temperature is too low, resulting in the problem of material flow trail, weld seam (or lack of welding), poor strength and serious shortage. Although the mold temperature is too high, although the fluidity of the molten material is good, the surface roughness of the products is small and the mechanical properties are good, the large shrinkage, the long period of forming and the shrinkage hole are produced. Therefore, the mold should keep a certain mold temperature so that it must be regulated by the heating and cooling system of the mold.