The stretch wound film, also known as stretch film, is self-adhesive, which can stretch and wrap the plastic film of the wrapped object. The self-adhesive will not adhere to the surface of the wrapped object, but only exists on the wrapping surface of the film and the membrane wall. In the process of packaging, there is no need for heat shrinkage treatment, which is conducive to saving energy, and high transparency is also convenient to identify the package items and reduce distribution errors.
Wrapping film
The stretch winding film for packaging must have two basic properties, one is to have good mechanical strength, extensibility and resilience, the other is to have good viscosity on its surface. Polyethylene can provide good mechanical strength, excellent elongation and better resilience for the stretch wound film, but it can not provide enough surface viscosity. Therefore, polyethylene stretch wound film needs the aid of tackifier additives to obtain the surface viscosity of the film.
The required viscosity of the stretch wound film should be good in both peel and lap adhesion. The higher the peeling viscosity is, the less easy the tray is to be unpacked, and the better the film's sealing performance is; the higher the bonding viscosity is, the less likely the film is to be displaced longitudinally, so in order to obtain a firm packaging, it is necessary to balance the peeling viscosity and bonding viscosity of the stretched winding film.
