PET heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, tasteless, good mechanical properties, especially in line with environmental protection and other characteristics, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrinkable film in developed countries.
However, ordinary polyester is a crystalline high polymer, and ordinary PET film can only obtain a thermal shrinkage rate of less than 30% after special processing. To obtain polyester film with higher thermal shrinkage, it must also be modified. That is to say, in order to prepare a polyester film with a high thermal shrinkage rate, it is necessary to carry out copolymerization modification of polyethylene terephthalate, a common polyester. The maximum thermal shrinkage rate of the copolymerized PET film can be as high as 70% or more.

The characteristics of heat-shrinkable polyester film: it is stable at room temperature, shrinks when heated (above the glass transition temperature), and heat shrinks more than 70% in one direction. The advantages of heat shrinkable polyester film packaging are:
① Body-fitting and transparent, reflecting the image of the product.
② The packaging is tightly bundled, and the anti-scattering property is good.
③ Rainproof, moistureproof and mildew proof.
④No recovery, there is a certain anti-counterfeiting function.

Heat shrinkable polyester film is often used in convenience food, beverage market, electronic appliances, metal products, especially shrink label is its main application field. Because with the rapid development of PET beverage bottles, beverage bottles such as Coke, Sprite, and various juices need PET heat shrinkable films to be matched with them as heat-sealing labels. They all belong to polyester, which are environmentally friendly materials and are easy to recycle. use.
In addition to being used as shrink labels, heat-shrinkable polyester films have also begun to be used on the outer packaging of daily commodities. Because it can not only protect the packaged items from impact, rain, moisture and rust, but also make the product win users with beautifully printed outer packaging, and at the same time it can well show the good image of the manufacturer. More and more packaging manufacturers use printed shrink film to replace traditional transparent film. Because the printing shrink film can improve the appearance of the product, it is conducive to the advertising of the product, and can make the trademark brand have a deep impression in the minds of consumers.