Preform mold & Blowing mould injection molding characteristics and requirements:
PET Preform injection molding
PET is a hygroscopic material, If the moisture 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.
PET blowing injection molding
PET blow molding bottles can be divided into two categories:
- One type is a pressure bottle, such as a bottle filled with carbonated drinks
- Another is the pressureless bottle, Such as bottles filled with water, tea, oil, etc.
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.
The future market for plastic bottle moulds
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.
Of course, for the growth of demand, there is a higher demand for plastic bottle molds.
1. Blowing molds require high productivity
Higher production efficiency can produce more plastic bottles at the same time, in order to win higher profits for customers.
So Multi-cavity blowing moulds are getting more and more popular, This will be the inevitable direction of the future.
2. Blowing mold requires high stability and heat resistance
More efficient production will test the steel and heat resistance of the mold
Improve the performance of the mold to ensure the reduction of the repair rate, providing a reliable guarantee for continuous production
3. Blowing molds require higher precision
Higher production requirements will increase the yield of the product
Therefore, for multi-cavity blow molding dies, higher precision can guarantee a high yield.