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Although there are many kinds and uses of stretch films, they also have their common characteristics. After all, their basic raw materials are the same, so there is no difference in use, that is, there are other differences in performance. Then we will briefly introduce what they have in common.
the PE winding film is sticky. By adding adhesive on the surface of the stretching film, the surface is wet and the adhesion is improved. The adhesion thickness is related to the dust and humidity on the film surface. Its viscosity is first related to the type and density of the material, thickness, temperature and the use of additives.
under the action of tensile force, the mechanical tensile direction increases the strength, which can extend the length of the tensile film and reduce the thickness of the tensile film. Some tension winding devices stretch and wind separately near the self load of the package, which increases the stretching times and prevents the extrusion and necking of the self load.
3. pavement: related to pinhole resistance and secondary tear resistance.
4. effective tensile (yield) is the tensile rate of PE winding film: the tensile film used for effective tensile can maintain other necessary properties: toughness, load integrity, etc. Its effective stretch varies by application. Of course, higher effective stretch and less stretch film can reduce the total packaging cost.
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