The process and viscosity control of pallet wrap

Viscosity control of pallet wrap

Pallet Wrap good adhesion to the outside of the packaging film layer and layer of sticky together to make goods strong, sticky access to important ways there are two: one PIB is added in the polymer or its masterbatch; the other is blending VLDPE. PIB for the translucent thin liquid, indirect increase in the need for special equipment,Or to stop the reform of equipment, are generally adopted PIB masterbatch. PIB out of a process, as usual to three days, the other is also affected by temperature, High temperature, high viscosity; low temperature is not too sticky, greatly reduced by the viscosity after stretching. But also to the best film products stored in a certain temperature scale,(Recommended storage temperature at 15 ℃ ~ 25 ℃). Mixing VLDPE, slightly less viscous, but no special requirements for equipment, viscosity is absolutely solid, not subject to,Time control, but also affected by temperature, the temperature is higher than 30 ℃ when the absolute viscosity, less than 15 ℃ when the viscosity is slightly worse, by conditioning the LLDPE adhesive layer,In order to achieve the desired viscosity. Three-tier co-extrusion to adopt such methods.

Physical and mechanical control

High stretchability of the stretch film contributes to the identification of goods; high longitudinal elongation is conducive to pre-stretching, and save the cost of data; stretch film good The puncturing function and the transverse tear strength allow the film to meet sharp edges or edges of the product at high draw ratios without breaking; the high compliance point enables the post-packaging More tight goods. Cast film production of high transparency, do not focus on the debate here. With the increase of the number of carbon atoms in the copolymer, the length of the branched chain increases, Crystallinity is low, natural copolymer "winding or kink" effect of growth, so elongation progress, puncture strength and tear strength are also improved. While M PE is a highly stereoregular polymer, molecular weight dispersion is very narrow, able to accurately control the physical properties of polymers, so there are further functional But also because MPE molecular weight dispersion narrow, processing scale is also narrow, processing conditions difficult to control, daily increase of 5% of LDPE, to reduce the melt viscosity Degrees, increasing the flatness of the film.

The process and viscosity control of pallet wrap