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Pet Bottle Making Preform Injection Molding Machine for Pet Bottles
PET bottle preform are processed again by blow molding to form plastic bottles, including bottles used for packaging cosmetics, medicine, health care, beverages, mineral water, reagents, etc. this bottle making method is called two-step method, that is, the method of forming bottle blanks by ZOWEITE® PET bottle preform injection molding machine and PET plastic bottles by blow molding again.
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ZOWEITE® PET bottle preform are processed again by blow molding to form plastic bottles, including bottles used for packaging cosmetics, medicine, health care, beverages, mineral water, reagents, etc. this bottle making method is called two-step method, that is, the method of forming bottle blanks by Pet Bottle Making Preform Injection Molding Machine for Pet Bottles and PET plastic bottles by blow molding again.
PET bottle preform is a typical Pet Bottle Making Preform Injection Molding Machine for Pet Bottles product, which is easy to transport. It is mostly made of plastic, with uniform texture and good insulation. It is an intermediate product of plastic bottles and machine oil barrels. Under a certain temperature and pressure, the mold is filled with raw materials and processed into a bottle blank with a certain thickness and height corresponding to the mold under the processing of the Pet Bottle Making Preform Injection Molding Machine for Pet Bottles. Polyethylene terephthalate is the most important variety of thermoplastic polyester. It is called polyethylene terephthalate in English, which is referred to as pet or PETP (hereinafter or PET), commonly known as polyester resin. PET bottles are widely used in daily necessities, daily chemical packaging and other fields. From mold processing to machinery and equipment, it is very picky, easy to get started and difficult to do precision.
What should we pay attention to when operating the Pet Bottle Making Preform Injection Molding Machine for Pet Bottles？
Because pet macromolecules contain lipid groups and have certain hydrophilicity, the pellets are sensitive to water at high temperature. When the water content exceeds the limit, the molecular weight of pet decreases during processing, and the products are colored and brittle. Therefore, the materials must be dried before processing. The drying temperature is 150 ℃ for more than 4 hours, generally 170 ℃ for 3-4 hours. The air injection method can be used to check whether the material is completely dry. Due to the short stabilization time after the melting point and high melting point of pet, an injection system with more temperature control sections and less self friction heat generation during plasticization shall be selected, and the actual weight of the product shall not be less than half of the injection volume of the Pet Bottle Making Preform Injection Molding Machine for Pet Bottles. Based on these requirements, ZOWEITE has developed a special plasticizing system for pet in recent years. The clamping force shall be greater than 6300t / m2. Do not use too long residence time to prevent molecular weight reduction. Try to avoid temperatures above 300 ℃. If the shutdown is less than 15 minutes. Only air shooting is required; If it exceeds 15 minutes, clean it with viscosity PE and reduce the barrel temperature to PE temperature until it is started again.
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