Difference between winding film and stretching film
Release time: 2020 / 07 / 04 14:55:35 reading volume: 1165 times
What's the difference between winding film and stretching film?
Winding film and stretch film are used to wrap the sales and transportation of different products, playing a protective and stable role. The two names refer to the same thing. The concept of winding film is broader. Winding film is also called stretching film. Some winding film can be stretched, some winding film can not be stretched, or the stretching rate is low, so stretch film belongs to the category of winding film.
Winding film is also called stretch film and heat shrinkable film. PVC winding film was produced earlier with PVC as base material, DOA as plasticizer and self-adhesive. But its cost is high. First, EVA is used as self-adhesive material for PE tensile film, and then pibv and LDPE are used as self-adhesive materials. Now LLDPE is the main substrate, including C4, C6, C8 and metal pempe.
From single layer to two-layer, three-layer; now tape casting is the main method to produce LLDPE stretch film, and in the early stage, blowing film is the main method. This is because tape casting line has the advantages of uniform thickness and high transparency. Because single layer tape casting can't stick on one side, its application is limited. Single layer and double layer tape casting is not as wide as three-layer casting in data selection, and formula interest is also high. Therefore, three-layer coextrusion structure is better.
Stretch film can not only achieve the functions of moisture-proof, dust-proof, touch proof, transparent display, but also increase the product appearance attraction. It can also be used to replace different cartons, which not only saves the packaging cost, but also conforms to the packaging trend. Stretch wrap film is used in food, sports goods, craft gifts, printing products, hardware and plastic products, telephone, electronic appliances and other products.
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