Causes
- Wrinkling due to uneven web run
- Insufficient spreading effect
- Lamella spreader roller in use
- Uneven film thickness
- Fluctuating web tension
Effects
- Damage to the product
- Scrap production
- Wrinkles due to overstretching of the substrate
- Insufficient web guiding
Thin films in particular tend to wrinkle when beeing processed which can lead to defects and rejects in subsequent steps. The cause can be, among other things, uneven film thickness or fluctuating web tension. Traditional sheet or lamella spreaders can lead to overstretching in the center of the web or marks on the film in the case of sensitive substrates.
