Stretch film is used for the sale and transportation of various products. It has high flexibility, is not easy to break, has strong blast resistance, strong impact resistance, strong tear resistance and strong pulling force.
Stretch film is widely used in the packaging of various products such as food, medicine, disinfection tableware, cultural and sports articles, craft gifts, printed matter, hardware and plastic products, telephones, electronic appliances, etc., especially in the combination of irregular physical goods or commodities. In terms of (bundle) packaging, it can not only meet the functions of moisture-proof and dust-proof, anti-touch stealing, transparent display, but also increase the attractiveness of the product. It can also be used to replace various types of paper boxes, which not only saves packaging costs, but also meets the requirements. Packaging trend. The shrink film (bag) can be processed into: shaped bags such as flat pockets, arc-shaped bags, trapezoidal bags, and three-dimensional bags. What are the main details about the stretch film process, I believe many people do not know, the following Xiaozhi plastic network Xiaobian for everyone to tell:
1. Adhesive control: Good adhesion makes the Shenzhen stretch film layer and the layer outside the goods stick together to make the goods firm. There are two main methods for obtaining the viscosity: one is to add PIB or its masterbatch in the polymer. The other is blending VLDPE.
2, the process conditions: casting method due to the long and narrow flow path, fast flow rate, the melt temperature range is generally controlled at 250 ° C ~ 280 ° C, the temperature of the casting chill roll is controlled at 20 ° C ~ 30 ° C, winding tension To be low, generally within 10kg, in order to facilitate the migration of the viscous agent, while reducing the stress in the finished film.
3, physical and mechanical performance control: high transparency is conducive to the identification of goods; high longitudinal elongation is conducive to pre-stretching, and save material consumption; good puncture performance and lateral tear strength allow stretch film in high At the magnification, the sharp corners or edges of the goods are not broken; the high yield point makes the packaged goods more tight.
The stretched film is produced by a three-layer co-extrusion casting process, and the imported linear low-density polyethylene is used as the main raw material. The technical indicators of the products have reached the international leading level, and have the advantages of uniform film roll, good tensile performance, strong retracting force, high transparency, high tear strength and self-adhesive at normal temperature.
