Both the heat shrinkable film and the stretch film belong to the PE film, and both of them are outer protective film, but the two films are essentially different in use and production process. The following is a professional packaging film manufacturer to introduce to you.
1. Heat shrinkable film is used in the sales and transportation of various products. Its main role is to stabilize, cover and protect the product. The shrink film must have high puncture resistance, good shrinkage and certain shrinkage stress. The film does not create holes during shrinkage. Since the shrink film is often used outdoors, it is necessary to add a UV anti-UV agent.
2. Stretch film, also known as stretch film (stretch fllm), using imported linear polyethylene LLDPE resin and tackifier special additives proportional formula production. The wound film was firstly made of PVC as a substrate, and DOA was a plasticizer and a self-adhesive effect to produce a PVC stretch film. Due to environmental problems, high cost (relative to PE ratio, small unit packaging area), poor stretchability, etc., it is gradually eliminated by PE stretch film. PE stretch film is first made of EVA as self-adhesive material, but its cost is high and taste. After development, PIB and VLDPE are self-adhesive materials. The substrate is now dominated by LLDPE, including C4, C6, C8 and metallocene PE. (MPE).
3. The shrink film is used in conjunction with the heat shrink machine. The texture is relatively brittle. When the heat shrink machine is turned on, it will blow against the shrink film. The shrink film will shrink. If you operate it properly, it will look good.The wrapping film is soft in texture and is used in a wrapping machine.