R3:the barrel heating temperature is too high R1:Raw materials storaged in store too long time R4:The position of the take-up plate is not correct.Ī2:Replace damaged parts or repair the moldĪ3:Adjust the ejection pressure to the appropriate stateĪ4: Check the position of the suction plate and the lip of the plate (generally set to: 22mm) Surface scratches (embroid body / thread) R4:the mold cooling water temperature is too highĪ1:adjust the screw temperature appropriatelyĪ2:adjust the screw back pressure to the appropriate pressureĪ3:appropriate to reduce the injection speed (usually 3.5 ~ 4 S when injected)Ī4:check the cooling cycle water temperature (9 ~ 11 ° C ± 2 ° C)Ī5:lengthen the cooling time (usually set to 3 ~ 4 S) 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:
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And update this table to help most people to fix the problems. We will check and find out the solution for you.
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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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