Paper fiber tissue has a strong hygroscopicity, it is easy to change with the environment wet and humidity changes its moisture content. Then, once the paper moisture content increases, the fiber organization will show the phenomenon of elongation; the other hand, the paper moisture content decreased, the fiber organization began to shrink phenomenon. So, this is why the paper comes in tight edges, curls, ruffles, and uneven surfaces. These deformations of the paper are the main causes of printing wrinkles, overprints, and ghosting failures. Daily production practice shows that: If the paper over the water loss over the four sides, the middle department is greater than the side of the water, it will form a tight edge situation. The tight edge of the paper when printing the middle part of the phenomenon prone to wrinkles, the solution is: in the pile of water splashing near the ground, increase the humidity of the environment so that the wet side of paper to restore flatness. If there is a prerequisite, you can use the hanging paper machine hang dry paper, and water splashing on the ground, so the effect is better. Paper edge curl is because the front and back of paper water content differences, so that there is a difference between the paper moisture content, so that the paper side of the low moisture content due to shrinkage and curl. When the curled paper edge curls, the printing process is easily caused by the paper feeding is not in place and the paper edge when biting paper, resulting in printing wrinkles, overprint or ghosting error. Wrinkled paper edges caused by printing wrinkles wrinkles are generally non-oblique shape, and the location of wrinkles are not fixed. The solution is to: curl the edges of the paper, so that the paper is flat and firm. Ruffle also easily lead to printing crepe, overprint or ghosting errors are not allowed, the most common is the printing wrinkle failure. Ruffle edge of the production of paper is the performance of hygroscopic elongation, so that the linear edge of the paper than the middle part of the length of the paper side of the relaxation and the middle of the formation of relatively flat, printing, was wavy embossing process by squeezing Pressure and the phenomenon of rolling wrinkles, the general appearance of this wrinkle in the paper side, especially in the most part of the printed goods drag tip wrinkles. Foil fluttering on the paper, its approach is: Hang the paper hanging on the paper so that the average water content of the same, and with the printing plant wet and humidity to maintain a relative balance, so that the paper should be restored Flatness. Maintain good flatness of the paper, should pay attention to the quality of the source to carry out the control of the length of the control: First, to maintain the confusion of the paper function, just enter the paper do not immediately put into use, the best rotation after a period of time with better results; Second Storage of paper warehouse and paper cutting workshop and printing workshop temperature and humidity, to maintain the appropriate balance of premises, can not be stored in the larger disparity in order to prevent the occurrence of deformation. It is also an effective measure to reduce or avoid printing wrinkles, overprints and ghosting failures.