Abstract: What material is heat shrinkable film? Heat shrinkable film is a plastic packaging material with high puncture resistance, good shrinkage and certain shrinkage stress. It is mainly used for the sales and transportation of various products. Its main function is to stabilize, cover and protect the products. What are the uses of heat shrinkable film? Let’s find out together below. What is the material of heat shrinkable film

1. PE shrink film

PE polyethylene is a transparent thermoplastic. There are three major categories of PE commonly used, namely: LDPE, HDPE, and LLDPE. The monomers of the three polyethylenes are the same, but the process conditions used to synthesize these polyethylenes are different, so three different polyethylenes are generated. Ethylene varieties, the performance of the three materials are quite different.

PE film is a material with very good toughness and is not easily crushed by ordinary plastic crushers. Because the PE film is soft and tough, it is not easy to shred. What's more, the high temperature of the tool at high speed will cause the LDPE to melt and stick to the blade. PE granulation can be directly put into strips into the feeding port of the extruder, and the PE film is dragged into the barrel by the shear force of the screw, heated, melted, extruded and granulated. The first-grade material recycled from PE can still be blown into film and used for non-food and pharmaceutical packaging. It is also widely used in the production of Oxford leather and waterproof cloth. It has a bright future.

2. POF shrink film

POF has the characteristics of high surface gloss, good toughness, high tear resistance, uniform heat shrinkage and suitable for fully automatic high-speed packaging. It is the best choice for traditional PVC thermal shrink film. Replacement product of shrink film. POF means heat shrinkable film. POF stands for multi-layer extruded polyolefin heat shrinkable film. It uses linear low density polyethylene as the middle layer (LLDPE) and polypropylene (PP) as the inner and outer layers. , which is plasticized and extruded by three extruders, and then processed by special processes such as die molding and film bubble inflation.

3. OPS shrink film

OPS (heat shrinkable film) is a new type of skin-friendly packaging material that meets environmental protection requirements. OPS heat shrinkable film has high strength, rigidity and shape. Stable, with good gloss and transparency. It is easy to process, easy to color, has good printing performance, and has extremely high printing resolution. It is a complete material improvement for trademarks that are constantly pursuing exquisite printing. Due to the high shrinkage rate and strength of OPS film, it can closely fit various containers of different shapes, so it can not only print exquisite patterns, but also meet the use of various novel packaging containers with different shapes. This non-toxic, odorless, grease-resistant film that meets food hygiene standards allows designers to use eye-catching colors to achieve 360° label design, giving full play to creativity and imagination, so that beverages and other commodities can be used on labels. In use, the pattern is more vivid, highlighting the image on the shelf, creating an unexpected container effect.

4. PET shrink film

PET heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, odorless, has good mechanical properties, and is especially environmentally friendly, polyester (PET) has become an ideal substitute for polyvinyl chloride (PVC) heat shrinkable film in developed countries. However, ordinary polyester is a crystalline polymer, and ordinary PET film can only obtain a thermal shrinkage rate of less than 30% after special processing. To obtain a polyester film with a higher thermal shrinkage rate, modification must also be carried out.

Uses of heat shrinkable film

Heat shrinkable film is widely used in food, medicine, sterilized tableware, cultural and sports supplies, craft gifts, printed matter, hardware and plastic products, telephones, electronic appliances, etc. The outer packaging of various products, especially the combined (cluster) packaging of irregular-shaped items or commodities, can not only meet the functions of moisture-proof and dust-proof, anti-touch and replacement, transparent display, etc., but also increase the appearance of the product. Attractive, it can also be used to replace various types of cartons, which not only saves packaging costs, but also conforms to packaging trends. Shrink film (bags) can be processed into: flat bags, arc-shaped bags, trapezoidal bags, three-dimensional bags and other special-shaped bags.