Understand clearly what is the reason why the stretch film is thin and not broken?

Understand clearly what is the reason why the stretch film is thin and not broken? Stretch film is currently used in many areas. Do you know why it is so thin but how can it not be damaged? Below, our editor will introduce the reasons for this to us. I believe we will solve our happy questions after reading it.

Stretch film

The machine-use stretch film has a wide range of applications, mainly used in conjunction with pallets to package scattered products as a whole, instead of small containers. Because it can reduce the transportation and packaging cost of bulk goods by more than 30%, it is widely used in the overall packaging of various products such as hardware, minerals, chemicals, medicine, food, machinery, etc.; in the field of warehouse storage, it is also used more abroad. Stretch film pallet packaging is used for three-dimensional storage and transportation to save space and occupation.

Material:

The PE stretch film first used EVA as the self-adhesive material, but its cost was high and it had a taste. Later, PIB VLDPE was used as the self-adhesive material. The base material is now LLDPE, including C4 C6 C8 and metallocene PE (MPE) The metallocene polyethylene resin product is a common single resin that can provide an unprecedented combination of film processing and the performance advantages of high-carbon alpha olefins (HAO).

Processors can complete a more stable processing process, increase output, reduce film thickness, and simplify the acquisition of resin materials. MPE resin has a wide processing range on both LLDPE and LDPE film processing equipment, and can cope with changes in production conditions. It is a product used to produce high-toughness and high-transparency films, which can significantly reduce the film thickness.

Process:

Compared with LLDPE/LDPE resin, it still provides better results. As a multifunctional resin, MPE resin can create value in multilayer blown film production lines, cast film production lines, and single-layer blown film production lines. Contributed to sustainable development. In the early days, LLDPE stretched films were mostly blown films, from single-layer to two-layer and three-layer; now LLDPE stretched films are mainly produced by casting method, and because of the narrow molecular weight distribution of stretched films, the processing range is also narrow. Processing conditions are difficult to control. Generally, 5% LDPE is added to reduce the melt viscosity and the flatness of the stretched film is added.

The casting method 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 scope of application is limited. Therefore, a three-layer co-extrusion structure is more ideal. The stretched film produced is uniform in thickness, good in tension, and not easy to crack.