Quality problems caused by film curling during film slitting

The first possibility is that the angle between the pressure roller and the film roll is too large, causing wrinkles. During the slitting process, the pressure roller contacts the film roll and applies pressure, which can alleviate the vibration of the film roll and prevent air from entering the roll.
When the diameter of the pressure roller is too large, a large wrapping angle will be formed between the film roll and the pressure roller. At this time, air will easily be involved in the material to form longitudinal wrinkles. When the diameter of the film roll continues to increase to be larger than the diameter of the pressure roller, this problem is eliminated. So the solution is to choose a larger diameter for the paper core or a smaller diameter for the pressure roller.
The second possibility is that the pressure of the pressure roller will increase as the diameter of the film roll or the slitting speed increases, causing the inner diameter of the roll to become loose and causing quality problems. Therefore, as the material diameter and slitting speed increase, appropriate Reduce roller pressure.
In addition, film tension is also an important factor affecting the slitting quality. Excessive tension will cause the material to be stretched and uneven transverse force will cause wrinkles. The tension during slitting and rewinding is too small, and it is easy to cause the film to run away and become loose. Therefore, as the diameter of the film roll increases, the tension should be gradually reduced. If it is reduced too quickly, it will also cause slipping between film layers.