Stretch film is not new to the packaging industry. Stretch film can make the goods packed well. This is mainly to pack loose goods into a set with pallets to avoid loosening or falling off. These advantages are outstanding because of the good processing conditions and formulations. What is the production process and formula? The following is a brief introduction to the new era:

Stretch film

1. Production process
Because the flow channel is long and narrow, the flow speed is fast, and the melt temperature range is generally controlled at 250 ° C to 280 ° C. The temperature of the casting cooling roll is controlled at 20 ℃ ~ 30 ℃, and the winding tension is low, generally within 10 kg. Conducive to the migration of adhesive, while reducing the stress of the finished film.


2. Recipe

Stretch packaging or PIB preparation is a masterbatch added to the polymer. The other is mixed VLDPE. PIB is a translucent viscous liquid, directly added to the need for special equipment or modified equipment. Usually PIB masterbatch is used. PIB immigration has a process, usually three days, which is also affected by temperature and the bond strength at high temperature. Lower viscosity reduces the viscosity after stretching it at a low temperature.

As the number of C atoms increases. The branch length and crystallinity of the copolymer increase. The "wrap or kink" effect of the copolymer is enhanced. As elongation increases, breakdown strength and tear strength also increase. However, MPE is a high-structure polymer with a narrow molecular weight distribution. The physical properties of the polymer can be precisely controlled, so the performance has been further improved. Moreover, due to the narrow molecular weight distribution of MPE and the narrow processing range, the processing conditions are difficult to control. Usually 5% LDPE is added to reduce the melt viscosity and improve the flatness of the film. The density of the material will also affect the performance of the film.