1. Change of working pressure
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. Change of tape tension
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. Changes in Machine Accuracy
The change of machine precision mainly includes the following parts.
(1) Accuracy of printing drum and embossing drum.
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) Accuracy of reticulated rolls
A. Accuracy Change of Reticulated Roller
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.
Variation of the number of reticulated lines. When printing conditions change, the number of screen lines should be adjusted accordingly.
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. 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) Accuracy changes of ink bucket rollers.
Change of surface quality of roll body: scratch or filament on surface; change of position accuracy with mesh roll: parallelism and center distance.
(4) Change of transmission gear
The change of gear processing accuracy and the change of tooth surface quality.
4. Change of Alignment Accuracy
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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