Shrink packaging A method of wrapping a product or package with a shrink film and then heating to shrink the film to wrap the product or package. Shrink wrap is a very promising packaging technology that is widely used in sales packaging and transportation packaging.
First, the main features 1. Good protection, transparent gloss, low processing cost, and light weight.
2. Shrink-wrapped packaging can closely adhere to the package, and can evenly bind and fix the product, eliminating the cumbersome operations of strapping materials such as packaging tapes.
3. Shrink packaging allows tightly packed items to shrink and take up less space. Because the plastic film has good toughness and cushioning properties, the contents are fully fixed, so it can effectively prevent the impact of shock and vibration on the contents, and the package is compact and not easily damaged.
4. Shrink packaging can be used for the collection and packaging of pallets. It can tightly pack items and trays, saving packaging costs and effectively protecting the product.
5. Shrink packaging can realize mechanized packaging, which is convenient for supporting the production line. The packaging efficiency is greatly improved, the packaging equipment is simple, the work is stable, and the versatility is good.
Second, the use of shrink film material is the most important one in shrink packaging materials. According to the characteristics that the thermoplastic plastic is restored under the heating conditions, during the process of forming the film from the plastic raw material, it is heated and stretched in advance and cooled to make a shrink film. The manufacturing method includes a secondary film stretching method in which a sheet-shaped film is formed, and then stretched along the longitudinal axis and the transverse axis, and a primary stretching method simultaneously performing stretching in two directions. Stretch or one-stretch method.
Currently used more shrink film material is: polyvinyl chloride, polyethylene and polypropylene, followed by vinylidene chloride, polyester, polystyrene, chlorinated rubber film and nylon resin. The main considerations in selection are shrinkage, shrinkage ratio, shrinkage tension, shrinkage temperature, and heat sealability. PVC shrink temperature is relatively low and wide range, shrinkage temperature is 40 ~ 160 °C, thermal shrinkage, good workability, but low impact strength, is not conducive to sealed packaging; polyethylene impact strength, low price, sealing Strong, good for packaging equipment. In addition, the recent ethylene vinyl acetate copolymer shrink film, high impact strength, high transparency, low softening point, good heat sealing performance, shrink tension, packaging is not easy to damage, suitable for equipment with protruding parts and special equipment packaging . The main technical indicators of shrink film are: shrinkage ratio and shrinkage ratio, shrink tension, shrinkage temperature and heat sealability. (To be continued)
First, the main features 1. Good protection, transparent gloss, low processing cost, and light weight.
2. Shrink-wrapped packaging can closely adhere to the package, and can evenly bind and fix the product, eliminating the cumbersome operations of strapping materials such as packaging tapes.
3. Shrink packaging allows tightly packed items to shrink and take up less space. Because the plastic film has good toughness and cushioning properties, the contents are fully fixed, so it can effectively prevent the impact of shock and vibration on the contents, and the package is compact and not easily damaged.
4. Shrink packaging can be used for the collection and packaging of pallets. It can tightly pack items and trays, saving packaging costs and effectively protecting the product.
5. Shrink packaging can realize mechanized packaging, which is convenient for supporting the production line. The packaging efficiency is greatly improved, the packaging equipment is simple, the work is stable, and the versatility is good.
Second, the use of shrink film material is the most important one in shrink packaging materials. According to the characteristics that the thermoplastic plastic is restored under the heating conditions, during the process of forming the film from the plastic raw material, it is heated and stretched in advance and cooled to make a shrink film. The manufacturing method includes a secondary film stretching method in which a sheet-shaped film is formed, and then stretched along the longitudinal axis and the transverse axis, and a primary stretching method simultaneously performing stretching in two directions. Stretch or one-stretch method.
Currently used more shrink film material is: polyvinyl chloride, polyethylene and polypropylene, followed by vinylidene chloride, polyester, polystyrene, chlorinated rubber film and nylon resin. The main considerations in selection are shrinkage, shrinkage ratio, shrinkage tension, shrinkage temperature, and heat sealability. PVC shrink temperature is relatively low and wide range, shrinkage temperature is 40 ~ 160 °C, thermal shrinkage, good workability, but low impact strength, is not conducive to sealed packaging; polyethylene impact strength, low price, sealing Strong, good for packaging equipment. In addition, the recent ethylene vinyl acetate copolymer shrink film, high impact strength, high transparency, low softening point, good heat sealing performance, shrink tension, packaging is not easy to damage, suitable for equipment with protruding parts and special equipment packaging . The main technical indicators of shrink film are: shrinkage ratio and shrinkage ratio, shrink tension, shrinkage temperature and heat sealability. (To be continued)
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