Do you know the definition of stretch film of PVC film?
Definition of stretch film of PVC film. In the early days, LLDPE stretch film was mostly blown film, from single layer to two and three layers; LLDPE stretch film was mainly produced by casting method. The process is shown in the figure below. Casting line production has the advantages of uniform thickness and high transparency, which can be applied to the requirements of high-magnification pre-stretching.
Because single-layer casting cannot achieve single-sided adhesion, the application field is limited. Single-layer and double-layer casting are not as wide as three-layer casting in terms of material selection, and the formulation cost is also high, so it is better to use a three-layer co-extrusion structure. A high-quality stretch film should have the characteristics of high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance.
This is the definition of stretch film of PVC film.
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