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PET preform mould and its gate design.and all weight(products and runner) is not less than 2 / 3 of machine injection volume. due to the shorter stable time after melting and high melting point, it is necessary to use the injection machine with more multi-step temperature control and less plasticizing friction heat system. The recycled material ratio is generally not more than 25%, and also the reground material should be completely dry. Whether the material is completely dry can be tested by a shot to air. And generally, it is 170 degrees, about 3-4 hours. Dry the drying temperature is 150 degrees, time more than 4 hours.The moisture will decrease the molecular weight of the pet, which would lead to poor color and brittle parts. Pellets in high-temperature water are more sensitive. due to pet macromolecules containing grease, it is hydrophilic. Therefore, it is mainly to change the fluidity of the melt by changing the pressure. The rheological property of PET is better in the molten state, and the pressure effect on the viscosity is greater than that of temperature. At present, the most used kind is PET-GF it is mainly for bottle PET preform manufacturing. PET, also called polyethylene terephthalate, is also known as polyester.
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PET injection moulding processing introduction PET preform neck finish categories PET preform specification Our PET preform mould incorporates world state-of-the-art bi-axis insert alignment and self-lock system in line with global best practices. We imported the heating band for the preform mould from Germany. Moreover, the Heater System is utilized to increase the hot-runner plate’s heating capacity with long life and effectiveness.
Pet preform mold full#
Heat coils keep the nozzles at a constant temperature through the full cycle time. The Dual Heating and Cooling system can ensure that the result of heating and cooling is excellent and quality control is reliable. Using a Pin-valve type of Hot Runner System for the PET preform mold, this type of Hot Runner System is effective in reducing processing times, reducing part wear & tear and lowering gate trim costs, and at the same time cutting electricity consumption. The application of this system does not affect the longevity of the PET mould throughout its useful life It is possible to make a difference in preform’s wall thickness of less than 0.006 mm by utilizing the Off-Center Correction Technique. Correction Technique for Core Off-Centered.Each particular water channel was specially processed to minimize the chance of jamming. It is important to design a preform mould so that the most appropriate steel and processes will be utilized to make it economically feasible for the manufacturer to manufacture the PET preforms.Īn especially designed set-up of water cooling channels combined with special finishing reduced the overall cycle time. Typically, to fulfill the requirements for designing a PET preform Mould for production, a preform mold must have functional strength, possess sales appeal, be competitively priced, and fulfill practical characteristics. High price: Pneumatically-driven valve, shut off nozzle.The nozzle pin is connected to the hydraulic cylinder (Japanese or European Origin) and designed to be synchronized with the PET preform mould plates movement.Innovative water hoses have been developed to reduce the leaking and reduce water spots on the preforms.Patented correcting technique allows for better control of thickness and reduces possible the preform thickness disorder that might occur during preform injection molding.Its excellent hardness, superior polish, anti-rust and accuracy make it an excellent choice for PET preform moulds making. ASSAB s136or DIN 1.2316 steel is used for mould impression and insert and for the slide insert because the steel is the best available quality and precision.The global criterion screw neck was developed with premium nitride steel to increase its durability and hardness at the same time.Moldflow analysis diminishes the amount of NG you can see.
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