Main features of polyethylene terephthalate (PET)

Main features of polyethylene terephthalate (PET)

The plastic most commonly used in the blowing process of flat plastic container is PET material, the scientific name is polyethylene terephthalate. PET clear round plastic container and lid were invented in the 1940s and used in the textile industry. In the 1970s, it was used to replace glass bottles as carbonated beverage packaging, which started the application of PET as the most suitable bottle packaging material, and With rapid development, so far, the amount of PET packaging materials is still growing rapidly every year.

PET black plastic container with lid bottle as packaging, compared with the traditional glass bottle and other general PE and PP bottles, PET shampoo bottle size has the following advantages and features:

1. Compared with glass bottles, PET is much lighter than glass, and its density is only 30-40% of glass. In addition to the difference in strength and molding process, if the requirements are also met, the PET bottle only needs 10% of the weight of the glass bottle.

2. High impact strength, meeting the requirements of general products for falling.

3. Good transparency and surface gloss, comparable to glass bottles, which is also a popular feature of PET bottles. High transparency and surface gloss, giving a beautiful and clean feeling.

4. It has high gas barrier properties, and its barrier properties to air, oxygen, and carbon dioxide are the highest among all commonly used materials. It can meet the needs of products with higher airtightness.

5. High chemical stability and safety.

6. The material price is lower.

7. Poor high-temperature resistance. Ordinary injection stretch blows PET bottles are easy to shrink and deform when heated, and are not suitable for high-temperature contents. For products with hot filling requirements, it is necessary to select targeted material grades and production processes to meet the requirements.

8. The water resistance is slightly worse, not as good as PE and PP materials, but better than PC, PS, and other materials, and can meet the requirements of most products, but products with special requirements for water resistance should be evaluated.