Laminate wrinkles, waves and creases: how to stop them
Wrinkles nearly always come from uneven tension, a roll that isn't centered, too much heat, or uneven roller pressure. Work through these in order before you blame the film.
Tension and centering
- Center the film roll (and liner or backing roll) on the mandrels so the web runs straight into the nip.
- Set unwind brake tension so the film is taut and even across its full width. Film that's loose on one side will wrinkle on that side.
- When you rethread, keep the film and backing equally snug before you clamp. One loose web is enough to start creasing.
Heat and speed
Too much heat softens the film and the print, so they stretch and wave. If wrinkles show up after you raise the temperature, lower it and slow down a little. If you've just switched from heavy to light film, reset to that film's recommended range.
Roller pressure
Run a "footprint" test: let clear film sit stopped in the heated nip for a few minutes, then run it out and look at the shiny band. It should be even from edge to edge. A tapered band means pressure is uneven, and that shows up as wrinkles that drift to one side.
Odd widths and the wrong roll
Film much wider than the print leaves extra film at the edges, which can wrap or wrinkle. Pick a width close to your common sheet or roll size. The film search lets you filter by width and core.