Wrapping film is also called Elastic film, Selfadhesive film, Stretched film. It is actually a kind of stretch winding that can use the viscoelasticity of the film itself to wrap the goods tightly by the viscoelasticity of the film surface and the tension used during use to achieve the purpose of protecting the goods. same heat

Compared with shrink film, it is all skin-friendly packaging, which is close to the surface of the packaged object, but heat shrinkable film uses heat to release the tension accumulated in the film and become a shrinking force to wrap the product. Both have good transparency, dust resistance, and anti-theft properties, and both can wrap several products of different shapes together to avoid loss or omission. A wide range of commodities can be packaged, ranging from small daily necessities to large mechanical equipment, stainless steel pipes, plastic pipes, etc. The wrapping film can be used for transportation packaging, such as packaging of daily necessities, wrapping wrapping of stainless steel pipes, plastic pipes, profiles, plastic decoration Board, roll floor, roll carpet wrapping, etc.

The performance requirements of stretch film are:

(1) When the stretch film is used, a large tension should be used to wrap the package. In order to prevent it from being broken, the stretch film must have sufficient strength to meet the requirements of manual winding or mechanical automatic winding

(2) The stretch film must have sufficient toughness, impact strength and pinhole resistance to prevent it from being pierced by sharp corners of irregularly shaped products during the winding process, and to prevent the packaging film from breaking when the product is impacted

(3) The stretch film is required to have good viscoelasticity, and it can still maintain the tension applied to the product during wrapping and packaging within 6 months after packaging, without slack and falling off. It is generally required to maintain 60% of the initial tension for 6 months after packaging.

(4) In order to ensure good adhesion of the repeatedly laminated parts when the stretch film is wound, it is required that the surface of the elastic film has a certain degree of stickiness. This can be done by using a resin with good viscoelasticity, or adding a plasticizer or a plasticizer to the resin. sticky resin. For example, adding materials such as plasticizer or neoprene to PVC; adding butyl rubber to LLDPE resin to improve the viscosity of the film. When an elastic film that is sticky on one side is required, two different formulations of the same base resin can be used to produce an elastic film that is sticky on one side and non-tacky on the other side by co-extrusion.