① It is necessary to have sufficient tensile strength and tear strength to prevent the wrapping film from being pulled apart under the tensile tension during packaging, as well as outstanding hole resistance to prevent the film from being punctured by sharp edges of the product during packaging, and to have good impact strength.
② Excellent stretchability and excellent viscoelasticity are required After stretching and wrapping, the product is tightly wrapped around it with a high degree of viscoelasticity, without any loss or for a longer period of time Usually, it is requested that the tension during packaging can still be maintained at 60% or more after 6 months
③ When wrapping packaging, the stacking between films should have excellent adhesion, which is conductive to maintaining the tension of the wrapping packaging, extending the relaxation time of film tension, and improving the tightness of the packaging
④ The elastic film can be used for a long time at -20-50 ℃ without any changes in function, can stand various changes in the environment, and has good weather resistance
⑤ Good heat sealing performance, with high heat sealing strength and low heat sealing temperature
⑥ Low price, easy to recycle and reuse of waste packaging for granulation, and easy to handle
According to the above request, the stretch wrap film can be produced using different materials and processing techniques to obtain film materials with variable characteristics and meet different needs