Why do wrinkles appear even though I clearly used a film blowing machine? The fundamental reason is that the film's transverse thickness is uneven. Even if it is very small, it can cause obvious wrinkles after accumulation, affecting the measured data of the fat loss test, film tearing test, film friction coefficient, etc. Let's take a look at the reasons and corresponding solutions.

Why do wrinkles appear even though I clearly used a film blowing machine? The fundamental reason is that the film's transverse thickness is uneven. Even if it is very small, it can cause obvious wrinkles after accumulation, affecting the measured data of the fat loss test, film tearing test, film friction coefficient, etc. Let's take a look at the reasons and corresponding solutions.

1. The pressure on both sides of the traction roller is inconsistent, one side is high and the other side is low: adjust the pressure of the traction roller to ensure that the film is evenly stressed:

2. The film thickness is uneven: adjust the thickness of the film to ensure uniform thickness;

3. The cooling effect is not enough: improve the cooling effect to ensure that the film can be fully cooled;

4. The inflation ratio is too large, causing the film bubble to be unstable, swinging back and forth, and prone to wrinkles: appropriately reduce the inflation ratio;

5. The tutoring of the herringbone splint is too large, and the film bubble is flattened in a short distance, so the film is also prone to wrinkles: appropriately reduce the angle of the herringbone splint.