检查是否是纸张膨胀引起的，通常是把印版四角的十字记号与印刷品上的十字记号进行比较。然而，实际的方法只是观察印刷品上的十字标记，检查颜色之间是否有相对位移。因为无论颜色之间的位移是平动的、倾斜的还是两者兼而有之，只要位移方向相同、角度相同、间隔相同，就可以断定纸张没有被拉伸。对于这种不因纸张的膨胀和收缩而引起的简单位移，检查纸张的裁切（尺寸、直角）是否符合要求。没问题，那可能是印刷机内部的机械问题。需要注意的是，当使用刚度较弱的薄纸时，特别是高速印刷相册时，上述位移可能是由于套准机构功能不足造成的。
To check whether it is caused by paper expansion, it is usually to compare the cross marks on the four corners of the plate with those on the printed matter. However, the practical method is to observe the cross marks on the printed matter and check whether there is relative displacement between the colors. Because no matter the displacement between colors is translational, oblique or both, as long as the displacement direction is the same, the angle is the same, and the interval is the same, it can be concluded that the paper is not stretched. For this kind of simple displacement not caused by the expansion and contraction of the paper, first check whether the paper cutting (size, right angle) meets the requirements. No problem. It could be a mechanical problem inside the press. It should be noted that when using thin paper with weak rigidity, especially when printing photo albums at high speed, the above displacement may be caused by insufficient function of registration mechanism.
检查每张纸张的套印误差是否由纸张拉伸引起。当每一张相册的印刷性能有明显差异时，可能是由于套印调整机构或纸张的直角。如果套色一致或相近，原因可能是二种颜色后印刷过程中滚筒和轮齿有问题。检查出现的颜色。当单色仪的所有颜色都不准，可确定原因是整个印刷过程中剪纸不良或湿度变化大。如果只出现特定颜色，则可以确定原因，因为打印机本身存在问题。但是，如果只是颜色的位移较大，而两种颜色之后是正常的，那么可能是由于翘曲、含水量低、波浪弯曲等原因造成的，这种问题可以通过吸收颜色印刷后的浸泡水来纠正。查抄在哪一部分与纸张无关的套印不准确，纸张各部分的位移程度是一样的。但由于纸张的膨胀和收缩造成的套印不准确，位移的程度与距离成正比，即离口或侧规越远，位移越严重。
Check whether the overprint error of each paper is caused by paper stretching. When the printing performance of each album is significantly different, it may be due to the overprint adjustment mechanism or the right angle of the paper. If the colors are the same or similar, the reason may be that there are problems with the roller and gear teeth in the printing process after the two colors are printed. Check the color that appears. When all the colors of the monochromator are not accurate, it can be determined that the reason is poor paper cutting or large humidity changes in the whole printing process. If only a specific color appears, you can determine the cause because there is a problem with the printer itself. However, if only the displacement of the color is large, and it is normal after two colors, it may be caused by warpage, low water content, wave bending and other reasons. This problem can be corrected by absorbing the soaking water after color printing. Check in which part of the paper has nothing to do with the overprint is not accurate, the displacement of each part of the paper is the same. However, due to the expansion and contraction of the paper caused by the overprint is not accurate, the degree of displacement is proportional to the distance, that is, the farther away from the mouth or side gauge, the more serious the displacement.
以上介绍了通过观察套色不准确的样品来判断原因的基本方法。我们需要知道齿和侧规的位置，印刷顺序，以及多色印刷是用单色机还是用多色机单色印刷。掌握连续印刷的几个样品也是必要的。
The above introduces the basic method of judging the cause by observing the samples with inaccurate color registration. We need to know the position of the teeth and side gauges, the printing sequence, and whether the multi-color printing is monochrome or multi-color. It is also necessary to master several samples of continuous printing.
