Ningbo haijiang machinery manufacturing co.,Ltd
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It is also known to most people that the shrinkage of injection parts is easy to occur when the melt temperature is too high. If the temperature is lowered appropriately by 10-20 C, the shrinkage problem will be improved.
However, if the shrinkage occurs in a relatively thick part of the injection part, then the melt temperature is too low, such as close to the lower limit of the melt temperature, which is not conducive to solving the shrinkage problem, or even more serious, the thicker the injection part is, the more obvious the situation is.
The reason is similar to the die temperature too low, the melt gel condensates too fast, and the temperature difference between the shrinkage water level and the nozzle can not be formed, so the feeding channel of the shrinkage water level will be blocked prematurely, and the solution of the problem will become more difficult. It can also be seen that the faster the melt condensation speed, the more unfavorable to solve the shrinkage problem, PC material is a very fast condensation raw material, so its shrinkage problem can be said to be a big problem of injection moulding.
In addition, too low melt temperature is also not conducive to increase the overall shrinkage, leading to an increase in the amount of concentrated shrinkage, thus aggravating the shrinkage problem.
Therefore, when adjusting the machine to solve the difficult shrinkage problem, it is very important to check whether the melt temperature is too low. In addition to looking at the thermometer, it is more intuitive to check the melt temperature and fluidity by air injection.
