POF is a kind of heat shrinkable film, mainly used for packaging products with regular and irregular shapes. Due to its non-toxic and environmental protection, high transparency, high shrinkage, good heat-sealability, high gloss, toughness, tear resistance, It has the characteristics of uniform heat shrinkage and suitable for automatic high-speed packaging. It is a replacement product of traditional PVC heat shrinkable film. It is widely used in automotive supplies, plastic products, stationery, books, electronics, circuit boards, MP3, VCD, handicrafts, photo frames and other wood products , Toys, pesticides, daily necessities, food, cosmetics, canned drinks, dairy products, medicine, cassettes and video tapes and other products.
1. With high transparency and good gloss, it can clearly display the appearance of the product, improve sensory awareness, and reflect high-grade.
2. The shrinkage rate is large, up to 75%, and the flexibility is good. It can package any shape of goods. And the shrinkage force of the three-layer co-extruded film treated by a special process is controllable, which can meet the shrinkage force of different product packaging. Claim.
3. Good welding performance and high strength, suitable for manual, semi-automatic and high-speed automatic packaging.
4. It has good cold resistance and can maintain flexibility at -50°C without embrittlement. It is suitable for storage and transportation of the packaged materials in a cold environment.
5. Environmentally friendly, non-toxic, in line with US FDA and USDA standards, and can package food.
The main raw materials of the five-layer co-extruded heat shrinkable packaging film include LLDPE (linear low density polyethylene), TPP (ternary copolymer polypropylene), PPC (binary copolymer polypropylene) and necessary functional additives such as slip agent, Anti-blocking agent, antistatic agent, etc. These raw materials are environmentally friendly and non-toxic materials, no toxic gas or odor will be generated during processing and product application, and the product's hygienic performance meets the US FDA and USDA standards, and can be used to package food.
The five-layer co-extrusion heat shrinkable packaging film is made of linear low-density polyethylene (LLDPE) and copolymer polypropylene (TPP, PPC) as the main raw materials, adding necessary additives, and processed by co-extrusion blow molding. Its process Different from the traditional blow molding process, due to the poor tensile properties of the PP melt state, the traditional blow molding process cannot be used. Instead, the double bubble process is used, which is also called the Pulandi process in the world. The product is melted and extruded out of the machine, through a specially designed co-extrusion die, the primary film is formed and then quenched, and then heated for secondary inflation and stretching to make the product.
The five-layer co-extruded heat shrinkable film can be produced in various specifications according to the application. The general thickness ranges from 12μm to 30μm. The usual thicknesses are 12μm, 15μm, 19μm, 25μm, etc. The width specifications depend on the volume of the package.
cold resistance: The five-layer co-extruded heat-shrinkable packaging film remains soft at -50°C without brittleness, and is suitable for storage and transportation of the packaged objects in a cold environment.
Hygienic performance: The raw materials used in the five-layer co-extruded heat-shrinkable packaging film are all environmentally friendly non-toxic materials, and the processing and use process are hygienic and non-toxic, in line with national FDA and USDA standards, and can be used for food packaging.
POF heat shrinkable packaging film has a wide range of uses, a broad market, and has the advantages of environmental protection and non-toxicity. Therefore, it has been widely valued by developed countries in the world. It has basically replaced PVC heat shrinkable packaging film as the mainstream product of heat shrinkable packaging materials. The production of this series of products in my country began in the mid-1990s. At present, there are more than ten production lines in China, all of which are imported equipment, with a total production capacity of about 20,000 tons.
Due to a certain gap between my country’s packaging technology and internationally developed countries, the application of three-layer co-extrusion series of heat-shrinkable packaging films in China is still at a preliminary stage, and the scope of application is still relatively narrow, limited to beverages, audio-visual products, convenience foods and a small amount of daily chemical products In a few areas, the annual demand is about 2 to 50,000 to 30,000 tons. PVC heat shrinkable film also occupies a considerable heat shrinkable packaging market, with huge development potential. With my country’s accession to the WTO and its integration with the international market, the gradual increase in packaging requirements for a large number of export commodities, and the rapid development of domestic supermarkets, the application of three-layer co-extruded heat shrinkable packaging film will increase rapidly. It is foreseeable that three-layer The market prospect of co-extrusion series heat shrinkable film is very broad.