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The solution for pearl luster and whitening of PET bottles during the blowing process

In the process of blowing, we often find this kind of problem. The PET bottle has pearl-like luster and whitening. What is the cause and solution?
Reasons for the whitening of pearl luster in the process of blowing PET bottles:
(1) The heating temperature of the preform is too low
(2) The problem of uneven wall thickness of the embryo tube occurs during the injection molding process.
(3) The thickness of the embryo tube is too thick, and the heating time is insufficient to penetrate. temperature not reached.
Method of exclusion:
1. Warm up the blow molding machine or slow down the revolution speed
2. Improve the quality of the embryo tube of the injection molding machine, and replace the high-quality injection molding tool when necessary.
3. Reduce the thickness of the embryo tube, or try to raise the outer cover of the heating device to increase the temperature distribution of the surface layer of the embryo tube. You can calculate the heating time according to the gram weight of the tube blank, and the time is strictly in accordance with the specified time.

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