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Film curls 

If the film curls up or down after it leaves the machine, review your manual for a section on the film tension, and readjust the film tension on the top or bottom. If the tension appears balanced but you notice waves or ripples toward the center of the web film as it comes out the back, the temperature may be too high or the lamination speed may be too fast for that film. These waves in the film are called “heat wrinkles.”