Types of shrink film

Types of heat-shrinkable film Release time: 2021-01-28 In recent years, heat-shrinkable packaging films have developed rapidly, expanding from a single PVC shrink film to PE, PP, PVDC, PA, OPS, PETG, PET, POF And many kinds of shrink film. With the changes in market demand, many new products have emerged for heat shrinkable films in the direction of multi-level and multi-functional development. As a label packaging material, heat shrinkable film has unique advantages: it saves forest resources, reduces costs, is moisture-proof, hygienic, and is convenient to use; the packaged products are beautiful, save space, and are suitable for mass production. Used by various products. PVC film labels have excellent inking properties, can be made into different colors, durability, tear resistance, softness, chemical resistance, transparency, and good shrinkage properties when exposed to heat. They are good, widely used in beverages and daily necessities. package of. However, PVC materials contain chlorine, which is poor in environmental protection. Polypropylene (opp) pearl film label is an environmentally friendly product. It has the characteristics of bright printing color, strong hiding power, and good roll surface smoothness. It is especially suitable for high-speed automatic labeling machines, and is widely used in Coca-Cola, Pepsi and other beverages. package.　　Polyethylene is recognized as a non-toxic material, and is especially suitable for product labeling in food, medicine, and beverage industries. The high transparent polyethylene heat shrinkable label printing film is made of high transparent polyethylene heat shrinkable film as the base material, and the film is produced by the international advanced flexographic printing plate brush. The film adopts a special formula to replace the conventional low density polyethylene resin. Heavy packaging materials to make heat shrinkable film with high transparency, good processing performance and high strength. To achieve 'skin-fit' packaging, so that the product has a distinctive appearance.　　 Introduction to PVC heat shrinkable film 　　 PVC heat shrinkable film is divided into ordinary packaging film and color printing film. Ordinary packaging film: suitable for all kinds of product packaging and combination packaging. The product features: good transparency, strong shrinkage, and easy operation. The packaged product can be sealed, moisture-proof, insulated, bright, firm and beautiful. Color printing film is not only used for various color printing labels, but also suitable for rotary sealing and heat sealing of product bottle and box packaging. Introduction to POF heat shrinkable film The environmentally friendly three-layer co-extruded polyolefin heat shrinkable film is made of ethylene/propylene copolymer EPC, propylene homopolymer PP, ethylene/propylene/butene three-layer copolymer EPB, and linear low density polyethylene LLDPE as raw materials. High-quality heat-shrinkable film made by co-extruding the inner, middle and outer layers on special equipment through a special process. It has all the advantages and advantages of polyethylene (PE) and polypropylene (PP) at the same time, and its excellent performance is far better than simple polyethylene and polypropylene. It is currently the most widely used and most popular environmental protection type in the world. Heat-shrinkable sanitary packaging materials are becoming the best-selling products in China to improve the quality of consumption and guide healthy consumption. Among them, the three-layer PE heat-shrinkable film is a domestic initiative and is an ideal substitute for imported films. The main materials for making shrink film sleeve labels are PVC (polyvinyl chloride) film, PET (polyester) film, PETG (modified polyester) film, OPS (oriented polystyrene) film, and its performance is as follows: 　　1, PVC film PVC film is currently the most widely used thin film material. Its price is extremely low, the temperature shrinkage range is large, and the requirements for the heat source are not high. The main processing heat source is hot air, infrared rays or a combination of the two. However, PVC is difficult to recycle and produces toxic gas when burned, which is not conducive to environmental protection. Its use has been prohibited in Europe and Japan.　　2. OPS film As a substitute for PVC film, OPS film is being used more and more widely. It has good shrinkage performance and is also conducive to environmental protection. Now the product is in short supply in the domestic market. At present, high-quality OPS membranes are still mainly dependent on imports, which has become an important factor restricting their development.　　3, PETG film PETG copolymer film is not only good for environmental protection, but also can adjust the shrinkage rate in advance. However, due to the excessive shrinkage, it will be limited in use.　　4, PET film Its technical indicators, physical properties, application range and use method are close to 'PVC' heat shrinkable film. With the improvement of people's awareness of environmental protection, domestic products gradually move towards the demand of the international market. At present, 'PET' heat shrinkable film is the most ideal packaging material to replace 'PVC'. PET film is an internationally recognized environmentally friendly heat shrinkable film material. Its technical indicators, physical properties, application range and use methods are close to PVC heat shrinkable film, but the price is cheaper than PETG film. It is currently the most advanced unidirectional shrinkable film. , Its transverse shrinkage rate reaches 70%, longitudinal shrinkage rate is less than 3%, and it is non-toxic and non-polluting. It is the most ideal material to replace PVC film. Previous: Overview and new progress of PVC heat shrinkable film development