Winder, or crepe wrinkles, happen during the winding process at the paper mill. They are no more than a 1/4 inch wide. They form a weakness in the paper and lead to jams in the delivery process. They also disfigure type and pictures during the offset printing process.
How do they happen?
Winder wrinkles are the result of poor tension during the winding process. If the outer layer of a paper wind is tighter than the one on the inside, or the paper caliper varies in any way, these wrinkles will form. This is exacerbated by the fact that the slippage between the paper layers is blocked. They can appear in multiples and repeat along the length of the sheet or web.
Offset printers will find this paper defect in all places in a paper roll or sheet pile. In paper rolls, it will most often be found near the beginning or end of a paper roll.
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