What are the selection criteria for pet cosmetics packaging material hose packaging?
Preforms are a step in the blow molding manufacturing process of PET cosmetic packaging material hose packaging, which directly affects the quality of the finished cosmetic packaging material hoses. Therefore, the selection standard for the production of preforms is relatively high. So what are the selection criteria for the preform of the PET cosmetic packaging tube packaging in the blow molding manufacturing process?
To prepare blow-molded bottles, the PET slices of the preforms that are injection molded at one time are required. The ratio of the raw materials is not too high, generally not more than 5%, and not more than twice the number. Recovery and molecular weight and viscosity are not too low, generally 31,000 to 50,000, and intrinsic viscosity is 0.78-0.85 grams per cubic meter. Injection molded preforms should be stored for more than 48 hours before use. After heating, the ratio of preforms must be kept for more than 48 hours before being reused for heating. The storage time of preforms should not exceed 6 months.
The pros and cons of PET preform materials depend to a large extent on the difficulty of the blow molding process, easy-to-shape materials and the establishment of a reasonable preform molding process, and also determine the blow molding of the preform cosmetic packaging hose Difficulty in molding, the requirements of the preform are pure, transparent, free of impurities, the same color, the length and the amount of halo.
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