What are the characteristics and requirements of injection molding of preform molds and blow molds

Update: 10-12-2021

PET is a hygroscopic material, If the moisture Pipe Fitting Mould content is too high, hydrolysis will occur under high-temperature processing.The PET molecular chain is broken and thermally decomposed to produce acetaldehyde, which has reduced mechanical properties and accelerated crystallization rate.Breaking and thermal decomposition of PET molecular chain to produce acetaldehyde, reduce mechanical properties and accelerate crystallization rate.


When PET material is shooting, Will cause partial crystallization of the preform, Affect product quality.Before the preform is injection molded, PET raw materials must be dried to a moisture content of 0.05% or less in order to produce a good pet preform.The quality of the preform depends largely on the pros and cons of the PET material.Should choose materials that are easy to inflate, easy to shape, and develop a reasonable preform forming process.


The requirements for preform products are pure, transparent, free of impurities, no discoloration, suitable for spot length and surrounding vignetting.The preforms, heating, pre-blowing, mold, environment and other factors in the PET bottle blow molding process have an important impact on the blowing process.Different from preform injection, Cap injection molding belongs to Thin wall injection.Caps are injection molded with PP, LDPE and HDPE materials, all of which are non-absorbent plastic materials.


No need for a dryer, processing equipment is much simpler.As the global economy recovers and plastic bottle packaging is difficult to replace in the short term, plastic bottle products will have a large market demand in the future.Nowadays people are increasingly pursuing individualization of packaging, and the future plastic bottle market is definitely a personalized world.All plastic bottle manufacturers come to be competitive in the enterprise, first of all, have more styles of blowing molds is better.Higher production efficiency can produce more plastic bottles at the same time, in order to win higher profits for customers.

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