Polyester heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, tasteless, good mechanical performance, especially in line with environmental protection, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrinkable film in developed countries.

However, the ordinary polyester is a crystalline polymer, and the ordinary PET film can only obtain a thermal shrinkage of less than 30% after special processing. In order to obtain polyester film with higher thermal shrinkage, modification must also be carried out. In other words, in order to prepare polyester films with high thermal shrinkage, it is necessary to copolymerize polyethylene terephthalate, which is a common polyester. The highest thermal shrinkage of PET film after copolymerization modification can be as high as 70%.

Characteristics of heat shrinkable polyester film: it is stable at room temperature, shrinks when heated (above the glass transition temperature), and more than 70% heat shrinks in one direction.

advantage:

① Body fitted and transparent, reflecting the image of the commodity.

② Tight packing, good dispersion resistance.

③ Rain proof, moisture-proof and mould proof.

④ No recovery, with certain anti-counterfeiting function.

Heat shrinkable polyester film is commonly used in convenient food and beverage markets, electronic and electrical appliances, and metal products, especially shrink labels. Because with the rapid development of PET beverage bottles, such as coke, Sprite, various fruit juice and other beverage bottles need pet heat shrinkable film as a heat sealing label. They belong to polyester, are environmentally friendly materials, and are easy to recycle.

In addition to being used as shrink labels, heat shrinkable polyester films have also been used in the outer packaging of daily commodities in recent years. Because it can not only protect the packaged goods from impact, rain, moisture and rust, but also enable the products to win users with beautifully printed outer packaging. At the same time, it can well display the good image of the manufacturer. At present, more and more packaging manufacturers use printed shrink film to replace the traditional transparent film. Because the printing shrink film can improve the appearance grade of the product, be conducive to the advertising of the product, and make the brand have a deep impression in the hearts of consumers.