What is the difference between stretch wrap and stretch film? The two names refer to the same thing. The concept of wrapping the film is wider. Stretch film is also called stretch wrap. According to different characteristics, stretch wrap can be divided into Manual Stretch Wrap, Machine Stretch Film, Clear Stretch Film, Black Stretch Film, Mini Stretch Film, Biodegradable Stretch Film.Some stretch film can be stretched, some stretch film cannot be stretched, or stretch rate is low, so pull Stretch film belongs to the category of stretch warp.
Stretch film, also known as stretch warp, Heat Shrink Film , the earliest in China to PVC as a substrate, DOA plasticizer and self-adhesive production of PVC film. However, its high cost, PE stretch film first is EVA self-adhesive material, but also taste, after the development of PIBV, LDPE is a self-adhesive material, the substrate is mainly LLDPE, including C4, C6, C8 and metal PEMPE.
From the single layer to the second layer and the third layer; the LLDPE Stretch Film is produced mainly by the cast method, and the LLDPE stretch wrap film is mainly blown. This is because the production of cast wire has the advantages of uniform thickness, high transparency, and can be applied to the requirement of high magnification pre-stretching. Since single-layer casting does not achieve one-sided adhesion, the application field is limited. Single and double-layer castings do not have three-layer casts in data selection, and formulas have high interest rates. Therefore, it is better to have a three-layer co-extruded structure. High-quality stretch film should have high transparency, high longitudinal elongation, high yield point, high transverse tear strength, and good puncture performance.
