Preform moulding5/1/2023 ![]() R4:the raw material stays in the screw for too longĪ1:The over-dried material is discharged, and the material is dried again.Ī2:the temperature is lowered (generally, the preform does not produce a white fog temperature increase of 2 ~ 5 ° C) is the normal temperatureĪ3:the temperature is reduced to the appropriate temperature (275 ~ 280 ° C) R2:the temperature of the barrel is too high R1:The drying time is too long or the material heating temperature is too high R3: The barrel heating temperature is too highĪ1: The quality of raw materials MUST be checked before entering the warehouse:Ī2: Check the operation of the dryer (such as: dew point, drying temperature / time)Ī3: Under the premise of ensuring the quality, try to reduce the temperatureĪ4: Set the back pressure under the premise of quality (400 ~ 600Psi)Ī5: Optimize the cycle time (to avoid the raw material staying in the screw for too long) R1: The quality of raw materials has quality problems: And update this table to help most people to fix the problems. We will check and find out the solution for you. Please feel free to contact us or leave your comment after the article if your issue is not list in below table. Now it`s public for reading and hope this article can help our customers and friends and save both our times. As many customers asking us a lot for PET preforms defects and remedies again and again. ![]() We spend more than two weeks to edit this PET preform troubleshooting guide for PET injection Molding.
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