PET heat shrinkable film characteristics

Characteristics of pet heat shrinkable film PET heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, odorless, good mechanical properties, especially in line with environmental protection, etc., in developed countries, polyester (PET) has become an ideal substitute for PVC heat shrinkable film. Definition Ordinary polyester is a crystalline polymer, 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 high 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 films are often used in convenience food, beverage markets, electronic appliances, and metal products, especially shrink labels are their 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. In addition to being used as shrink labels, heat-shrinkable polyester film began to be used on the outer packaging of daily commodities. Because it can not only protect the packaged items from shock, rain, moisture, and rust, but also make the product win users with its beautifully printed outer packaging, and it can well show the good image of the manufacturer. More and more packaging manufacturers use printed shrink films to replace traditional transparent films. Because the printed shrink film can improve the appearance of the product, it is conducive to the advertising of the product, and the trademark brand can have a deep impression in the hearts of consumers. PET shrink film properties Unitization This is one of the characteristics of shrink film packaging. With the strong winding force and retraction of the film, the product is compactly and fixedly bundled into a unit, so that the scattered small pieces become a whole, even in unfavorable environments, the product does not have any looseness or separation, and is not sharp and sharp. The edges and stickiness to avoid damage. Primary protection Primary protection provides surface protection of the product, forming a very light and protective appearance around the product, so as to achieve the purpose of dustproof, oilproof, moistureproof, waterproof and anti-theft. It is especially important that the stretch film packaging makes the packaged items evenly stressed and avoids damage to the items caused by uneven force, which is not possible with traditional packaging methods (bundling, packing, tape, etc.). Compression and fixity The product is wrapped and packaged by the retraction force of the stretch film to form a compact and space-free unit, so that the pallets of the product are tightly wrapped together, which can effectively prevent the product from being damaged during transportation. Mutual displacement and movement, and at the same time, the adjustable stretching force can make the hard products stick tightly and shrink the soft products, especially in the tobacco industry and the textile industry with unique packaging effects. Cost saving The use of stretch film for product packaging can effectively reduce the cost of use. The use of stretch film is only about 15% of the original box packaging, about 35% of the heat shrinkable film, and about 50% of the carton packaging. At the same time, it can reduce the labor intensity of workers, improve packaging efficiency and packaging quality. Previous: Classification and use of heat shrinkable film Next: Types and characteristics of heat shrinkable film