the set back-pressure is too large → try to reduce the back-pressure.the barrel heating temperature is too high → try to reduce the temperature.→ Check the position of the suction plate and the lip of the plate (generally set to: 22mm) The position of the take-up plate is not correct.the lip ejection position / pressure is too large → adjust the ejection position / pressure to the appropriate state.remove the plate suction tube damaged → replace the damaged suction tube or repair.mold damage → replace damaged parts or repair.cooling time too short → increase it by little, usually 3-4s.temperature of cooling water is too high → check the temperature, suggest 9-11 ℃☒℃.injection speed too high → reduce it little by little.heating temperature of barrel is too high→ reduce the temperature.the raw material stays in the barrel for too long time → inject empty the raw material inside the barrel, then re-charge.the mold temperature is too high → reduce the temperature to the appropriate temperature (275 ~ 280 ° C).

the temperature of the barrel is too high → reuce the temperature(generally, temperature is 2 ~ 5 ° the temperature that the preform does not occur a white fog is the normal temperature.→ The over-dried material should be discharged, and then use new material to be dried again. The drying time is too long/the temperature is too high.the cycle time is too long → optimize the cycle time (to avoid the raw material staying in the barrel for too long time).the set back-pressure is too high → reduce the back-pressure under the premise of quality (400 ~ 600Psi).the barrel heating temperature is too high → try to reduce the temperature under the premise of ensuring the quality,.poor drying effect → check the operation of the dryer (such as: dew point, drying temperature / time).→ The quality of raw materials should be checked before entering the warehouse. The quality of raw materials has quality problems.position adjust which allow the robot to enter inĬommon quality defects and solution of PET injection molding AA value too high.match of the pressure holding and cooling.adjust of injection speed and pressure of PET injection molding machine.adjust of the distance between extract plate and eject plate.increase the speed of ejecting speed of injection machine.increase the speed of mold open/close of injection machine.The ideal moisture content after drying is approximately: 10 to 40 ppm (+/- 10 ppm), ie 0.001-0.004%Įxcessive drying will cause AA increasing and IV decreasing. Feeding inlet temperature is 160℃ or more.The moisture content of the raw material granules usually ranges from 0.1 to 0.3% (1000 to 3000 ppm). Prepare for high temperature preparation for PET into the injection molding machine for shear plasticization Water absorption characteristics of PET (essentially caused by hydrolytical degradation of PET)Ģ. It has an influence on the pressure resistance of the beverage bottle and is easily broken. IV (Intrinsic Viscosity) viscosity drop.The odor of the beverage bottle causes the beverage to taste (but has little effect on the human body) AA (Acetaldehyde) acetaldehyde increase.Too much content of water of PET material will affect the production as below: Why need to dry the PET resin before PET preform injection molding? 1.Remove the moisture from the PET material before injection moldingīecause PET material has a certain water absorption, it absorbs a lot of water during transportation, storage and use. Excellent strength properties, and can be further improved by biaxial stretching.No toxic gases will occur when burning.Good hygiene, PDA – approved (the largest chemical laboratory in the United States).Excellent chemical is almost resistant to all organic drugs.Excellent transparency of over 90%, excellent surface gloss and a glassy appearance.PET material is usuallly used for injection molding for plastic bottle preform,such as mineral water bottle,coca-cola bottle,juice bottle,etc. PET is a polyester,which is an abreviation of PolyethyleneTerephthalate. We are also looking agent in another country. New Thinking Mold &Plastic have agent and service office in Indonesia, Egypt ,Thailand,Turkey. We can make PET mold from 2 cavity to 72 cavity for all brand injection molding machine ,such as KraussMaffei,Arburg,Ferromatic,Haitian ,Borch,Yuzumi,Toshiba and so on. We machinery our PET mold by high advance CNC machine ,grinder machine ,drilling machine ,EDM machine and so on Our engineer team make more than 45,000 cavity mold in the world We have many patent of hot runner system in PET MOLD And our reasch and development team are in this line more than 15 years experience

Pet preform mold