The winding of the solvent-free composite film must be tidy, otherwise, the tunnel phenomenon will easily occur on the loose edge of the winding. For example, when the winding tension taper is set to 10% (150mm) / 15% (300mm) / 20% (450mm) when the small paper core is wound, the composite surface layer can be wound neatly, and it appears when the composite inner layer Uneven winding phenomenon; switch to large paper core for winding and set the winding tension taper to 10% (200mm) / 30% (350mm) / 40% (550mm).
If the winding tension taper is set too small, the outer ring will produce a greater squeezing force on the inner ring. If the friction between the inner and outer layers is smaller after the film is wound (the film is too slippery, the friction is small), then The phenomenon of rewinding and squeezing as shown in the figure on the right appears. When setting a larger winding tension taper, the winding can be neat again.
The above example shows that the winding uniformity of the solvent-free composite film is related to the setting of the tension parameter, and is also related to the slip agent between the films.
It can be determined that if the pressing roller bounces during rewinding, and the surface of the two-layer PE composite film is soft, it is easy to crimp the film roll.
There are many factors that cause the film roll to jump, such as deformation of the paper core (which becomes elliptical), assembly errors caused by uneven cuts on the end surface of the paper core, and sudden thickening of the film roll. Naturally, a larger winding tension will also alleviate this phenomenon.
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