![]() Too high heating temperature local cold slug Preform body insufficient extending on the vertical direction Lower the preform bottom heating temperature. Misalignment of blow pin the bottle bottom ĭistance between blow pin and bottle bottom over 1.5 mm Īdjust the distance between blow pin and bottle bottom to be 1.5mm or smaller Too high preform bottom temperature too low preform temperature severe decompositionĬheck and change the preform and material,improve the drying Verify the PET preform even soften by 100 C water. Increase the temperature of the PET preform Insufficient heating temperature injection fault of PET preform Increase the PET preform heating temperature and even the all body temperature Insufficient PET preform heating temperature ![]() Lower the temperature,especially on the bend section. Pre-long the cooling time clean the cooling line Įccentric temperature adjust orifice uneven density of PET preform įix the PET preform mold fix temperature adjust base Lower hold pressure increase the injection speed Improve the cooling clean the screw increase the hold pressure Too short injection time too short hold time Improve the accuracy and use adjustable core and cavity. Short fill or welt line on the neck of PET preform Increase the injection speed or prelong the injection time Misalignment of hot runner nozzle and gate Vapor condensation in the core and cavity Lower drying temperature and prelong drying time Sliver streaking or yellowing of PET preform Lower the hold pressure fix the PET preform mold Improve the cooling and make the wall thinner Verify the drying temperature and shot volume, drying temperature 165 ℃ and moisture<0.02% ![]() Increase the PET material heating temperature Too low temperature of nozzle of hot runner And will will waste lots of raw material if the preforms getting yellow (over melted or burned ).īelow table list is the PET preform injection molding troubleshooting guide for your further information: Defects / Problems It may cause failed to bottle blowing if there are pet preform defects like the moisture not match the requirement( PET heating temperature is not collect). As the PET preforms`s quality affects a lot in the following step PET preform blowing process. PET preform injection molding troubleshooting is very important during the whole PET bottles making process. They will help you make a suitable selection based on your equipment, the complexity of the shape of the PET bottle, and your special requirements.Plastic PET Preform Injection Molding Troubleshooting To choose the best packaging option for your needs, contact a sales representative or technical support specialist. In addition to standard preforms, RETAL manufactures custom preforms tailored to individual customer requirements. RETAL offers a full assortment of polyethylene terephthalate (PET) preforms for packaging, transporting and storing drinking water, mineral water, carbonated beverages, juices, nectars, baby food, dairy products, beer, low-alcohol and alcoholic beverages up to 40% abv, edible oil, mayonnaise, ketchup, sauces, household and cosmetics products Barrier preforms provide additional benefits and increased beverage shelf life, thanks to a special layer embedded in several layers of polyethylene terephthalate. Preforms can be single-layer or multilayer. Preform weight depends on the end container’s desired volume. They are produced by RETAL using a highly-accurate injection molding process on equipment from the leading world vendors. Preforms are manufactured from polyethylene terephthalate (PET), so they are called PET preforms.
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