Introduction to the function of heat shrinkable film!

Introduction to the function of heat shrinkable film! Do you understand shrink film? The author will explain to you. Ordinary polyester is a crystalline polymer, and ordinary PET film can only get a heat shrinkage rate of less than 30% after special processing. To obtain a polyester film with a higher heat shrinkage rate, it must also be modified. In other words, in order to prepare a polyester film with a high thermal shrinkage rate, it is necessary to copolymerize and modify ordinary polyester, namely polyethylene terephthalate. The highest heat shrinkage rate of the PET film modified by copolymerization 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: ①The body is transparent and reflects the image of the product. ②Tightly tighten the packaging, good anti-scattering. ③Prevent rain, moisture, and mildew. ④ No recovery, with a certain anti-counterfeiting function. Heat-shrinkable polyester film is often used in the convenience food, beverage market, electronic appliances, and metal products. In particular, shrink labels are the main application areas. Because with the rapid development of PET beverage bottles, beverage bottles such as cola, sprite, and various juices require PET heat shrinkable film to be matched with heat seal labels. They belong to the polyester category and are environmentally friendly materials that are easy to recycle. use. For more information about shrink film, please pay attention