How to choose the raw material of plastic preform?

How to choose the raw material of plastic preform? Pay attention to these things when purchasing!

The plastic preform is the initial form of the plastic bottle. It takes many steps to process it into a complete material. Before making it, you must first select its raw materials. Its raw materials include polyethylene, polyamide, And several materials such as polyoxymethylene. When you buy it, you should also pay attention to choose according to your own requirements. Next, I will give you a detailed introduction to the selection of raw materials for plastic preforms and the precautions when purchasing them.

Raw material selection for plastic preforms:

The English abbreviation of polyethylene is "PE". The crystallinity of high-pressure polyethylene is relatively low, so the density is small and the texture is relatively soft. Compared with low-pressure polyethylene, it has higher transparency and excellent impact resistance and low temperature resistance. But it is not heat resistant. Low pressure polyethylene is more permeable than high pressure polyethylene, but less impact resistant than high pressure polyethylene. Both polyethylenes are susceptible to stress cracking.

The English abbreviation of polyamide is "PA". There are many classifications of polyamide, the chemical structure should also be different due to the different synthesis, and the performance will also be somewhat different, but their commonalities and performances are also similar.

Polyamide has relatively high crystallinity, high mechanical strength, good toughness and fatigue resistance, and the plastic preform made of it is relatively easy to color and shape, and can be used for a long time at room temperature. However, its heat distortion temperature is low, its hygroscopicity is relatively large, and its dimensional stability is relatively poor.

POM is a highly crystalline substance, abbreviated as "POM". POM is a very elastic material with strong chemical stability, impact resistance and creep resistance, and POM's rigidity, High strength and wear resistance, it is a commonly used plastic preform material. However, polyoxymethylene has a high shrinkage rate, high technical requirements for size control, and relatively low corrosion resistance.

30MM 29/25 PET Preform