Film winding pressure principle

When winding non-elastic film materials, the dynamic roller pressure is very important in controlling the hardness of the film roll.
Appropriate pressure can eliminate the air entangled with the film material. The greater the pressure applied, the greater the hardness of the winding. Rolling pressure can also introduce tension in the material into the web. The basic guiding principle is to use as little roller pressure as possible to wind up while ensuring the ideal hardness. Winding too tight will cause a series of problems such as deformation or blocking the material from passing through the thickness measurement area. The roller pressure must be applied at the entrance of the material winding. The weight of the web, the quality of the pressure roller and the feed roller and the film tension cannot affect the roller pressure, and it should be steadily reduced along with the winding process to prevent star and The emergence of overlapping problems.
Although the applied pressure is constant, it is worth noting that for larger diameter rolls, the entrainment of more air will still gradually reduce the roll pressure.