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The difference between stretch film and wrapping film
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Packaging films and stretch films are used to package various products for sale and transportation, and play a role in protecting stability and concealment. Both names refer to the same thing. The concept of packaging film is broader. Packaging film is also called stretch film. Some cling films can be stretched, and some cling films cannot be stretched, or the stretching rate is low, so stretch films belong to the field of cling films. Packaging film, also known as stretch film and heat shrinkable film, is a PVC packaging film produced in China with PVC as the base material, DOA as plasticizer and self-adhesive effect. However, its cost is high. PE stretch film first uses EVA as a self-adhesive material, but also has flavor. Later, PIBV and low density polyethylene were used as self-adhesive materials. Now the main substrate is LLDPE, including C4, C6, C8 and metal PEMPE.
From single layer to 2. three layers; At present, LLDPE stretch film is mainly produced by casting method, and the previous LLDPE stretch film is mostly blown film. This is because the casting line has the advantages of uniform thickness and high brightness of the stretched film manufacturer, and can be applied to the requirements of high-speed pre-stretching. Since single-layer casting cannot achieve single-sided bonding, its application field is limited. Single-layer double-layer casting is not as wide as three-layer casting in data selection, and the formula is also interesting, so it is better to use three-layer co-extrusion structure. High-quality stretch film should have high brightness, high longitudinal elongation, high yield point, high transverse tear strength and good puncture performance. Stretch film can not only meet the stretch film manufacturers moisture-proof, dust-proof, anti-theft, bright surface display function, but also increase the aesthetics of the product. It can also be used to replace various cartons, which not only saves packaging costs, but also fits the packaging trend. Stretch film is widely used in food, medicine, disinfection tableware, stationery, craft gifts, printed matter, hardware and plastic products, telephone, electronic appliances and other packaging.
wenzhou chuangjia packaging material limited company's main products: seven layer coextrusion stretch film, heat shrinkable film, air valve bag, food packaging multilayer coextrusion vacuum bag, multilayer coextrusion heat shrinkable bag, eleven layer cast film, coextrusion film, stretch film, vacuum food packaging bag, is a stretch film manufacturers.
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