Cause of the problem:
1. The thickness of the substrate is not uniform, and the difference in thickness is too large.
2. The position of the substrate is skewed, causing wrinkles in the composite film, and as the skewness accumulates, the degree of wrinkles will increase accordingly.
If the substrate is a film material that is easily affected by humidity (such as nylon film), and the phenomenon of moisture absorption occurs, it is easy to produce wrinkles during the extrusion and compounding process.
4. The tension setting and control are improper, and the tension of each part is not coordinated or matched.
5. Improper composite pressure setting.
6. The axis between the silicone rubber pressure roller and the cooling steel roller is not parallel.
7. The surface of the guide roller is not clean, foreign matter is stuck, or the surface of the guide roller is not smooth, there are pits, scribes, bruises, etc.

Solution:
1. Replace the substrate to ensure that the thickness of the substrate is uniform.
2. Adjust the position of the substrate so that no skew occurs during the conveying process.
3. Preheat and dry the substrate, or replace the substrate without moisture absorption.
4. Adjust the tension of unwinding and rewinding to make the tension of each part adapt and match each other.
5. Adjust the pressure of the composite roller to an appropriate size according to the actual situation.
6. Adjust the relative position between the silicone rubber pressure roller and the cooling steel roller to keep them parallel.
7. Clean the surface of the guide roller and replace the damaged guide roller to ensure that the surface of the guide roller is flat, smooth and clean.