R2:The ambient temperature of the workshop is too high or the humidity is too high, causing the mold to hydrate the waterĪ1:Increase the temperature of the circulating water of the moldĪ2:Lowering the air conditioning temperature R1:The temperature of the mold cooling water is too low R3:The nozzle valve delay closing time is too longĪ1: maintenance hot runner cylinder or replacement of new nozzleĪ3:Reduce the nozzle valve delay closing timeĪ4:Maintenance valve needle control valve R2:The hot runner nozzle temperature is too high R1:The hot runner nozzle cannot be closed or the nozzle mouth is worn out R4:The pressure holding time is too short R3:Hot runner / nozzle temperature is too high R2:Hot runner valve needle cylinder blockage R1:The drying effect of raw materials is poor R6:Mold cooling cycle water temperature is too lowĪ1:Increase injection volume (the remaining position after injection is generally 5~8mm)Ī3:Speed up the injection speed (optimal injection time: 3.5 ~ 4s)Ī4:Reduce the pressure holding position (injection pressure: 900 ~ 1200Psi)Ī6:Increase the cooling water temperature (set: 8 ~ 10 ° C) R4:The pressure holding position is too large R2:Screw slips can not cut the raw materialsĪ2: (general production of color oil only has this phenomenon) Check whether the color oil is too high, replace the color oilĪ4:Check whether the screw feed temperature meets the requirements (normal requirement is 160 ° C) R1:The screw heating temperature is too low R4:the mold circulating water pressure is lowĪ1:Set a longer cooling time (set: 3 ~ 4S)Ī2: the holding pressure is extended (set to: 3 to 8S) increase the holding pressure (level 1: 800Psi, level 2: 700Psi, level 3: 600Psi)Ī3:the mold cooling water temperature is high → reduce the water temperature (set: 9 ~ 11 ° C ± 2 ° C)Ī4: increase the water pressure (set: 6 ~ 7 Kg) R3:the mold cooling water temperature is high R2:The holding time is too short / the pressure is insufficient R7:the quality of the raw material itself has quality problemsĪ1:Raw materials to achieve first-in-first-out methodĪ2:check whether the dryer is normal, maintain the dryer, check the dry bead use time (usually 2 to 3 years replacement)Ī3:under the premise of ensuring the quality, try to reduce the temperatureĪ4:under the premise of quality will be back pressure, generally set: 400 ~ 600 PsiĪ5:reduce the heating temperature of the warmer, generally set: 280 ~ 285 ° CĪ6:check the wet / temperature of the warehouse (generally: 70% / 28 or less), do a first-in-first-out inventory method R6:the preform storage time is too long or the warehouse environment temperature, humidity is too high R5:the mold heating temperature is too high 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: 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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