Stretch film, also known as stretch film and heat shrink film, is the first domestic PVC stretch film to be produced with PVC as the base material and DOA as the plasticizer and self-adhesive. The supply of stretch film in Dongguan was gradually eliminated due to environmental protection issues, high cost (relatively heavy in PE, less unit packaging area), poor stretchability, etc., when the domestic production of PE stretch film was started from 1994 to 1995. The PE stretch film first used EVA as the self-adhesive material, but its cost was high and it had a taste. Later, PIB and VLDPE were used as self-adhesive materials. The base material is now mainly LLDPE, including C4, C6, C8 and metallocene PE (MPE).

In the early days, LLDPE stretched films were mostly blown films, from single-layer to two-layer and three-layer; Dongguan stretch film supply now mainly produces LLDPE stretch films by casting method. The process is shown in the figure below. This is because of 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.

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