Quick copy and small commercial printers frequently ask us about the best way to avoid wrinkling, sometimes called “alligator skin,” when folding cover stocks. Copiers and digital presses can print on some fairly heavy papers. The problem arises because the types of tabletop folding machines found in these smaller operations or in-plant departments are usually designed for text papers. The smaller the fold roller diameter, the smaller the range of papers you can run. Curl also increases in severity as fold roller diameters decrease.