1.工作压力的变化
1. Change of working pressure
不同的印刷条件应有与其印刷条件相适应的工作压力，在印刷画册过程中应对墨量压力λ、着墨压力λ和印刷压力λ进行经常调整。
Different printing conditions should have corresponding working pressure with their printing conditions. In the process of printing picture albums, the ink volume pressure lambda, the inking pressure lambda and the printing pressure lambda should be adjusted frequently.
2.纸带张力的变化
2. Change of tape tension
纸带张力的变化直接影响套准精度。如果要求套准精度较高，则纸带张力应相应增加。不过，纸带张力不能随意增大，如果纸带张力过大，则会加剧纸带的伸缩变形，这将成为影响套准精度的主要因素之一。
The change of tape tension directly affects the alignment accuracy. If higher alignment accuracy is required, the tape tension should be increased accordingly. However, the tension of paper tape can not be increased at will. If the tension of paper tape is too large, it will aggravate the stretching deformation of paper tape, which will become one of the main factors affecting the alignment accuracy.
3.机器精度的变化
3. Changes in Machine Accuracy
机器精度的变化，主要包括以下部位。
The change of machine precision mainly includes the following parts.
(1)印刷滚筒与压印滚筒的精度。
(1) Accuracy of printing drum and embossing drum.
滚筒轴颈与滚筒体的同心度≤0.01mm;印版滚筒与压印滚筒的平行度;二滚筒中心距的变化。
The concentricity of cylinder journal and cylinder body is less than 0.01 mm; the parallelism of plate cylinder and impression cylinder; and the change of center distance of two cylinders.
(2)网纹辊的精度
(2) Accuracy of reticulated rolls
A.网纹辊本身的精度变化
A. Accuracy Change of Reticulated Roller
网穴深的变化。网穴深度一般为0.023~0.03mm，如果网穴清洗不当或表面磨损加大，都会使网穴深度减小，造成传墨量的不足。
Changes in the depth of the reticulum. Point depth is generally 0.023 ~ 0.03mm. If the hole is not cleaned properly or the surface wear is increased, the hole depth will be reduced, resulting in insufficient ink transmission.
网纹线数的变化。印刷条件发生变化应相应调整网纹线数。
Variation of the number of reticulated lines. When printing conditions change, the number of screen lines should be adjusted accordingly.
网穴粗糙度的变化。当网穴加工不当，其网穴表面较粗糙时，或当印刷中网穴表面被溶剂侵蚀造成表面粗化时，都会影响传墨效果。
Change of mesh roughness. Ink transfer effect is affected by improper hole processing, rough surface of the hole, or when the surface of the hole is roughened by solvent erosion in printing.
B.网纹辊与印刷印版滚筒和墨斗辊相互位置精度的变化。主要包括中心距的变化和平行度的变化。
B. Changes in the accuracy of the position between the screen roll and the printing plate drum and the ink bucket roll. It mainly includes the change of center distance and parallelism.
(3)墨斗辊的精度变化。
(3) Accuracy changes of ink bucket rollers.
辊体表面质量变化：表面划伤或出现丝纹;与网纹辊位置精度的变化：平行度和中心距。
Change of surface quality of roll body: scratch or filament on surface; change of position accuracy with mesh roll: parallelism and center distance.
(4)传动齿轮的变化
(4) Change of transmission gear
齿轮加工精度的变化;齿面的表面质童的变化。
The change of gear processing accuracy and the change of tooth surface quality.
4.套准精度的变化
4. Change of Alignment Accuracy
各印刷印版滚筒位置精度的变化;承印材料运行精度的变化;印刷承印材料张力的变化。
The change of the position accuracy of the cylinder of each printing plate, the change of the operating accuracy of the printing material, and the change of the tension of the printing material.
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