The positioning of the plate center on the substrate is the first step to correct plate calibration.

所谓版心的定位实际上就是将印版上的图文准确的在承印物上进行定位，进而满足套印和印后加工的要求。对于我们比较常见的印刷品而言，就是把我们需要印刷的图文部分完整的印刷于承印物表面，而且要有满足成品要求的页边距，同时还要满足某些印后加工的特殊要求。

The so-called layout center positioning is actually to accurately position the pictures and texts on the printing plate on the substrate, so as to meet the requirements of overprint and post press processing. For our more common printed matter, it is to completely print the graphic parts we need to print on the surface of the substrate, and have a margin to meet the requirements of the finished product, as well as some special requirements for post press processing.

·对于不同的印版和承印物，版心的定位要遵循以下的原则：

·For different plates and substrates, the positioning of the plate center shall follow the following principles:

1.为了满足印刷的后续工作（裁切、装订等）能够准确顺利的进行，除非不得以，一般要求要将版心边框（图一虚线部分）和承印物的边缘（图一粗黑线框）相平行。

1. In order to ensure that the subsequent work of printing (cutting, binding, etc.) can be carried out accurately and smoothly, unless it is not allowed, it is generally required to parallel the layout center frame (dotted line in figure I) with the edge of the substrate (thick black frame in figure I).

2.如果当版心小而承印物较大时，要使版心在承印物上上下、左右居中。

2. If the print center is small and the substrate is large, the print center shall be centered up, down, left and right on the substrate.

3.当版心较大，而承印物面积显得紧凑时，少要保证图文边缘的裁切距离（如图一中的红色箭头所指为裁口距离）。

3. When the layout center is large and the substrate area is compact, at least ensure the cutting distance of the image and text edge (as indicated by the red arrow in Figure 1 is the cutting distance).

4.对于有角线的印版，一般将四个角线全部印出，并保证叼口大小一致。在不能保证四个角线全部印出时，在不影响叼口图文清晰的条件下，可适当的减小叼口尺寸，使拖稍的角线全部印出。

4. For the printing plate with corner lines, generally print all four corner lines and ensure the same size of its mouth. When it is impossible to ensure that all four corner lines are printed, under the condition of not affecting the clarity of the picture and text of the mouthpiece, the size of the mouthpiece can be appropriately reduced to make all the corner lines dragged slightly printed.

5.根据印件图文特征和胶印工艺的特点，应尽量使印件的天头或印张的定位边留大些，地脚或印张的非定位边留小些。

5. According to the graphic characteristics of the printed piece and the characteristics of the offset printing process, the positioning edge of the top of the printed piece or the printing sheet shall be larger and the non positioning edge of the anchor or the printing sheet shall be smaller as far as possible.

6.在保证版心位置正确的前提下，对于多色印刷品要保证色与色间误差不超过0.1㎜，正背套印一般不能超过0.5㎜。

6. On the premise of ensuring the correct position of the layout center, for multi-color printing, the error between colors shall not exceed 0.1mm, and the front and back overprint shall generally not exceed 0.5mm.

·在实际的生产操作中我们除了要严格依据工单作业，还有以下的考虑：

·In the actual production operation, in addition to strictly following the work order, we also have the following considerations:

1.实际的印刷纸张由于裁切原因，并不能完全保证纸张边缘完全整齐（即裁切大小是存在偏差的）。因此我们在版位校正的时候，要根据纸张大小的误差程度，将版心向规矩边做适当的移动。

1. Due to cutting, the actual printing paper can not completely ensure that the edges of the paper are completely neat (i.e. there is deviation in the cutting size). Therefore, when correcting the layout, we should move the center of the plate to the regular edge according to the error degree of the paper size.

2.当印活版心叼口位置有图文，尤其是“出血”的印活，要尽量将版心向拖稍移动。这样做有两点好处，一是能尽量的保证叼口部分图文能印足；二是能减小叼口处由于掉版严重对于图文部分的损坏。

2. When there are pictures and texts at the mouth of the printing plate center, especially for "bleeding" printing, try to drag the plate center slightly. This has two advantages. First, it can ensure that the pictures and texts in its mouth can be printed as much as possible; Second, it can reduce the damage to the image and text part due to serious version loss at its mouth.

3.对于有一些有特殊装订要求的产品要认真分析，比如如图二示，图示要求经过1、2两次滚折完成装订的初步骤，这样就要求我们必须将距离a和距离b在校正印版的时候达到一致，或a略小于b（如果a大于b的话会导致在2次折页的时候将左侧边缘在B处受折，由此会导致装订困难）。

3. Some products with special binding requirements should be carefully analyzed. For example, as shown in Figure 2, the figure requires that the initial steps of binding should be completed after 1 and 2 roll folding, which requires us to reach the same distance a and distance b when correcting the printing plate, Or a is slightly less than B (if a is greater than B, the left edge will be folded at B when folding twice, which will lead to binding difficulties).

诸如此类在实际印刷工作中应当注意的问题还有很多，在此不一一列举。以上我们简单介绍了在印版校正的时候需要注意的几点问题，对于版心在承印物上的位置应该心中有数。

There are many problems that should be paid attention to in the actual printing work, which are not listed here. Above, we briefly introduced several problems that should be paid attention to when correcting the printing plate. We should know the position of the plate center on the substrate.

关于印版的色与色间、正背间的套印，实际上和印版在承印物上的定位操作手段是一样的，只需要将各色印版向预定的印版定位位置拉拽（或用其他方式，以下有介绍）就可以了，本文不再多论。

The overprint between colors and between front and back of the printing plate is actually the same as the positioning operation means of the printing plate on the substrate. It only needs to pull each color printing plate to the predetermined positioning position of the printing plate (or in other ways, as described below). This paper will not discuss it more.

以上的精彩内容来自：济南丰印纸制品有限公司济南手提袋的介绍及分享，更多内容请继续关注我们：http://www.xinfengyinshua.cn

The above wonderful content comes from the introduction and sharing of Jinan handbag of Jinan Fengyin paper products Co., Ltd. please continue to pay attention to us for more content: http://www.xinfengyinshua.cn