Do you know the production process conditions of stretched film? If you want to know the production process conditions of stretched film, you will know more about stretched film. A stretch film manufacturer tells us about the production process conditions of stretch film:

First, the sticky control:
The outstanding stickiness makes the packaging film layer on the outside of the product stick together with the layer 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 to blend VLDPE. . PIB is a translucent viscous liquid. Direct addition requires special equipment or equipment modification. Stretch film manufacturers generally use PIB masterbatch.

There is a process for the removal of PIB, which usually takes three days. In addition, it is affected by temperature. When the temperature is high, the viscosity is strong. When the temperature is low, it is not sticky. After stretching, the viscosity is greatly reduced. Therefore, the product film is optimally stored in a certain temperature scale (preferred to be stored at a temperature of 15 ° C to 25 ° C). Blending VLDPE, the viscosity is slightly worse, but there is no special requirement for the equipment, the viscosity is relatively stable, and it is not controlled at all times, but it is also affected by temperature. When the temperature is higher than 30 °C, the viscosity is relatively sticky. When the temperature is lower than 15 °C, the viscosity is slightly worse. The desired viscosity is achieved by adjusting the amount of the adhesive layer LLDPE. This method is used for three-layer coextrusion.


Second, the physical and mechanical performance of the control:
Outstanding puncture performance and transverse tear strength allow the film to encounter sharp corners or edges without cracking at high draw ratios; high transparency facilitates product identification; high longitudinal elongation facilitates pre-stretching, and Saving data consumption; high yield points make the packaged goods more tight.

The film produced by the casting method has a high transparency and does not focus on the comments here. Following the addition of the number of C cations of the data comonomer, the length of the branch is added, the crystallinity is decreased, and the resulting copolymer "circumferential or kink" effect is added, so the elongation is improved, and the puncture strength and the tear strength are also improved. MPE is a high stereoregular polymer with a narrow molecular weight distribution and precise manipulation of the physical properties of the polymer, so there is further improvement in performance. Because MPE has a narrow molecular weight distribution, the processing scale is also narrow, and the processing conditions are difficult to control. Stretch film manufacturers generally add 5% LDPE to reduce the melt viscosity and add the flatness of the film.