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Kenplas Forum ==> Injection Molding (Machine) ==> Bubbles in Preforms
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BUBBLES IN PREFORM
-INCREASE BACK PRESSURE
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Dear sir;
We are a Prod .Co bsaed in Tehran . We would like to establish a mineral water packing production line which has min 8000 bottles.1.5 lit /hour output and we need machines (rising , filling , capping, jet printer ,film shiring .)and plants with same speed we would appreciate your sending us an up-to-date price list for your machines and would be gratful if you let us have introductin and exact details of your machines and how long space would it be need that would put there .
We look forward to hearing from you soon .
yours faithfully
(Mr.) A. Behesti
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1. PET resin is not well dehumidified;
2. Reduce "suck-back";
3. hot runner temperature too high;
4. Poor mold venting.
P.S. Where did you get our trouble shooting manual?
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For the past two weeks, the preforms we make have been coming out with bubbles in them. The bubbles do not form every cycle. They would appear for a few cycles, disappear for some time before forming again. I have tried all the possible solutions stated on your trouble shooting section, but to no avail.
The screw inside the barrel has been taken out and checked and nothing seemed to be wrong with it. The center point of the nozzle coincides with that of the hole in the mould.
Your advice to this matter would be greatly appreciated.
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This forum published since July 03, 2002.
Renewed on June 22, 2005. |
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