The temperature of the dryer was set between 177 ° C and 182 ° C and dried for approximately four hours.įirst, the preforming process is performed to produce the preform, which is to spray the molten glue into the cavity, and then rapidly cool to make the preform temperature lower than the crystallization temperature to form a transparent preform the second step is to heat the preform. For dry air, the dew point temperature must be between -29 ° C and -40 ° C. Preform mold Dryer Dry PET pellets are circulated in the hopper by using high temperature air after dehumidification. Before the preform is injection molded, the PET pellets must be dried to a moisture content of 0.05% or less, in order to produce a good amorphous transparent preform. When the preform is injected, it will cause Part of the preform is crystallized and whitened, which affects the quality of the product. The physical and mechanical properties are reduced, and the crystallization rate is accelerated. If the water content is too high, hydrolysis will occur under high temperature processing, and the PET molecular chain will be broken and thermally decomposed to produce acetaldehyde. PET pellets commonly used in the manufacture of containers must pay attention to the following characteristics: PET is a crystalline resin having a specific gravity of about 1.4, a melting point of 245 ° C, and a molding temperature of about 290 to 315 ° C. The longer the number of molecular chain linkages, the better the physical properties of PET. The molecular weight is the number of uniform molecules of the PET molecular chain.
The most important characteristic is its molecular weight. Today, Xiaobian will give you a brief introduction to the injection molding process of PET preforms. 90% of the mechanical components including the basic structure are produced in-house, which absolutely guarantees faster delivery strict quality inspection system includes three Coordinate Measuring Machine (CMM) and MSA system to achieve closed-loop control of QA system, higher level of quality and service assurance.Polyethylene terephthalate (PET), with: (1) excellent gas barrier properties (2) pressure resistance, creep resistance (3) impact resistance (4) transparency, surface gloss (5) It is odorless and fragrant (6) It is safe in food hygiene, beautiful in appearance and easy to form, and has been widely used in food containers. We produce 7,000 machines per year, and have the world's most advanced processing equipment and machining workshops. As one of the top 5 plastic injection molding machine enterprises in China issued by China Machinery Industry Federation (CMIF). Achieve mass production and partial assembly line operation.
#Preform injection machine factory professional
Ningbo Beilun Highsun Machinery Co., Ltd, established in 1973, is a leading PET Injection Molding Machine manufacturers and PET Injection Molding Machine Factory in China, with over 48 years of experience, Professional wholesale PET Injection Molding Machine and other types of injection molding machines, equipped with advanced CNC machining system (CNC utilization rate: more than 83%).
PET Injection Molding Machine manufacturers
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