POF heat shrinkable film Each film has its own uniqueness

Shrink film sleeve label is a new type of label printed on plastic film or plastic tube. It mainly includes PE, PVC, PET and other common heat shrinkable film types. It has the following characteristics: 1) The shrink film sleeve label is easy to process, the package is sealed, Anti-pollution and good protection for goods; 2) The shrink film sleeve is close to the goods, the packaging is compact, and the product shape can be displayed, so it is suitable for irregular goods that are difficult to pack; 3) When the shrink film sleeve label is labeled, no adhesive is required It can obtain the same transparency as glass; 4) The shrink film sleeve label can provide a 360° omni-directional decoration to the packaging container, and can print product information and other product information on the label, so that consumers do not need to open the package. Understand the performance of the product; 5) The printing of the shrink film sleeve label is printed in the film, which can protect the imprint, and the label has better wear resistance. Because the shrink film sleeve is a kind of thermoplastic film that is stretched and oriented during the production process, and shrinks by heat during use. Therefore, before the design of the surface pattern, the horizontal and vertical shrinkage rate of the material, as well as the allowable deformation error in each direction of the decorative graphic and text after shrinking, must be taken into account to ensure the accurate restoration of the pattern, text, and bar code shrinking to the container. Because it belongs to the category of heat shrinkable film, its material and characteristics are no different from ordinary heat shrinkable film, but the printing is more exquisite. Design points and material selection principles 1. The design of the decoration pattern on the label design film cover should be determined according to the thickness of the film. When designing a pattern, we must first understand the horizontal and vertical shrinkage of the film, as well as the allowable shrinkage in each direction after packaging and the allowable deformation error after the decoration pattern shrinks to ensure that the shrinked pattern and text can be accurately restored. 2. Film thickness and shrinkage The materials used for shrink film sleeve labels should focus on three factors: environmental protection requirements, film thickness and shrinkage performance. The basis for determining the thickness of the film is the application field and cost factors of the label. Of course, the price is not a decisive factor, because each film has its own uniqueness, users and trademark printers must clarify the film used and the most suitable material technology before signing the contract. In addition, the indicators required by the processing equipment and other process factors also directly affect the choice of thickness. Generally, the film thickness required to make shrink film sleeve labels is 30-70μm, of which 40μm and 50μm films are used more. In addition, there are certain requirements for the shrinkage of the film, and the transverse (TD) shrinkage is higher than the longitudinal (MD) shrinkage. The transverse shrinkage rate of common materials is 50%～52% and 60%～62%, and can reach 90% under special circumstances. The longitudinal shrinkage rate is required to be 6% to 8%. When making shrink film sleeve labels, you should try to choose materials with small longitudinal shrinkage. 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 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. It has been banned in Europe and Japan. 2. OPS film is 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 mainly rely 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 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 and is currently the most advanced Unidirectional shrink film has a transverse shrinkage rate of 70% and a longitudinal shrinkage rate of less than 3%. It is non-toxic and non-polluting. It is the most ideal material to replace PVC film. At present, there are many companies that use shrink film to make products, such as shrink film to make product packaging bags, and Jinlong Color Printing is one of them. In addition, the heat shrinkable film tube is also a material for the production of shrink film sleeve labels, and can be formed at one time without sewing in the production. Compared with the horizontally flat film, the cost of using a heat shrinkable film to cover the label is lower, and the tube surface printing is more difficult to achieve. At the same time, the graphics and text of the heat shrinkable film tube label can only be printed on the surface of the film. The graphics and text are easy to wear during transportation and storage, which affects the entire packaging effect.