PET bottle means the bottle contains a kind of chemical plastic which has been called “polyethylene terephthalate”. And we just call it PET bottle. PET is a kind of polymeric substance which is made by chemicalizing Terephthalic acid Ethylene glycol.
PET plastic is featured by light weight, high-transparency, and not easy to be broken. And PET can also stop the CO2 gas, which can keep the CO2 gas for the carbonated drinks.
PET bottles have been widely used in bottling, chemical, cosmetic industry.
PET bottles are normally made from a kind of PET plastic tube, and we call it PET preform, which is made by PET preforms injection molding machine.
Here are the common problems and solutions for the PET preforms injection molding machines.
Common problems and solutions for PET preforms injection molding machine, Part 1.
1, PET preforms’ bottom white/milky color.
A, Causes:
1. Temperature for the hot runner tunnel is not enough.
2. Material temperature is not enough.
B, Solutions:
1. Enhance the heat-isolation device. To keep the temperature.
2. Increase the temperature for the milky color part.
3. Increase the material temperature properly.
4. Speed up the injection process.
5. Reduce the pressure.
6. Slow down the cooling water speed.
2, PET preforms not clear/transparency.
A, Causes:
1. PET granules are not dry enough.
2. PET granules are not plasified enough.
3. PET preforms are too thick.
4. Preforms are not cooled enough.
5. Other materials are mixed into the PET granules.
6. Material temperature is too low.
B, Solutions:
1. Make sure the granules been dried for at least four hours.
2. Increase the granules temperature.
3. Increase the rotary speed of the injection screw.
4. Make sure the water contains to be less than 0.02% under the temperature of 165 degrees.
5. Enhance the cooling water.
6. Reduce the thickness of the preforms.
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WhatsApp: 0086 137 28668423
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