#PREFORM INJECTION MACHINE FACTORY ISO#

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.

#PREFORM INJECTION MACHINE FACTORY ISO#

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Preform injection machine factory