Problems & solutions of PET preforms injection process, Part 7.
16, White or milky color on preforms after adjusting the temperature
A, Causes:
1, The temperature is too low or too high
B, Solutions:
1, Change the temperature to a right parameter
2, Increase the temperature
3, Make sure the internal and external of the preforms the same
17, Holes on preforms end/bottom
A, Causes:
1, Temperature for the end/bottom part is too high
2, Temperature for the preforms body is too low
3, Raw plastic granules are not good quality
B, Solutions:
1, Adjust the temperature for the preforms
2, Get good quality PET granules
3, Increase the dryer, make sure the PET granules are dried enough.
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