1. Too much moisture on the plate will cause the paper to stretch and misprint. Offset printing process is inseparable from the dampening solution (except waterless offset printing), so during transfer of the graphic in the blanket cylinder, the moisture on the blanket will be absorbed by the paper, causing the paper fibers to wet and expand and stretch the paper. long. The larger the printing layout, the more inaccurate the overprint will be. Therefore, the amount of fountain solution must be controlled to a minimum amount, which is limited to non-image plate non-stick oil.
2. Difference in base thickness due to the thickness of the base itself, resulting in overprint graphics...
Because thick and thin bases can produce graphic and text size errors in printing, the base thickness should be reduced in color sequence to avoid overprinting errors in the printing process.
3. The rubber layout part is loose and the different blankets are tight on the rollers. Due to the uneven distribution of surface tension, the stress in some areas is loose. In this way, during the printing process, the elongation of the blanket in the stretched area is small. The change in size is small; the stretched area of ​​the stretched blanket has a large elongation and the graphic size changes greatly. Therefore, uneven elasticity of the layout of the rubber will lead to localized image registration errors. Therefore, when changing the blanket, you should pay attention to:
1) The blanket must be cut properly, and then it should be rectangular after being clamped so that the stress on the surface can be even;
2) The strength of the splint screw should be as uniform as possible;
3) The splint should be positive 4) The length of the dragging pad should be the same.
4. The tightness of the blanket caused by the deformation characteristics of the blanket resulting in the size of the graphics caused by the registration error, mainly from the roller pressure and tension and the quality of the blanket itself. The different degree of tightness of the blanket not only produces correspondingly different frictional forces on the surface of the cylinder, but also has a close relationship with the deformation of the blanket and the elongation caused by the elongation of the graphics. According to the law of deformation of leather cloth, its pushing deformation depends on two points:
1) The size and direction of friction;
2) The elongation of the blanket.
In other words, under the same direction and the same size friction, if the blanket itself has different elongation, the degree of deformation will inevitably be different. At the same time, the degree of tightness of the blanket on the roller also determines the blanket of the blanket. The elongation of it and the friction, that is, the more tightly stretched, the smaller the elongation during the printing process, the smaller the graphic size change, but the increase in the amount of friction on the layout; otherwise, the elongation is large, and the layout The amount of friction is also reduced accordingly. According to the tension of the blanket, the graphic change caused by the cause of the registration error, in the operation should pay attention to:
1) Should use rubber blanket printing with less elongation;
2) The tightness of the blanket should not be too loose or too tight and must be kept constant;
3) The registration error caused by the dimensional change of the graphics and text caused by the tightness of the blanket must not exceed 0.10 mm. Otherwise, the color shift may occur due to misalignment of the dots.
Third, mechanical overprinting is not allowed This is due to the lack of mechanical structure design and the adjustment of the use of errors and institutional wear caused by overprinting is not allowed. This type of overprinting is inaccurate (such as misregistration of the register, poor design and manufacturing accuracy of the cylinder, wear of the parts, etc.) and overprinting due to mechanical misalignment (such as roll paper) The paper force is not adjusted well, and the local adjustment error of the roller gear pitch circle causes a registration error. In order to avoid this type of overprinting is not allowed, the operator is required to use and adjust the machine in the correct way when adjusting the register; on the other hand, it must also pay attention to maintenance and timely maintenance.
In summary, we can see that the accuracy of color newspaper registration is affected and restricted in many ways. In addition, the last step of prepress preparation for color newspapers—adjustment rules—is an important factor determining the quality of color report printing. Although each version has overprinted ten lines or other overprint marks, merely achieving these mark registrations does not mean the first overall color paper registration, but also pay attention to local (fine level) registration. For example, in color newspapers, the features and features of the characters, eyelids, eyebrows, lips, etc.; some fine designs, signs, etc. in the advertisements. Their registration directly determines the quality of the color newspapers. Therefore, in the operation, after the registration line (or mark) is substantially aligned, the boundaries of each dot of the dot and the real block must be observed with a magnifying glass, and fine adjustment of certain special parts is performed, so as to achieve the entire set of the picture. quasi.
2. Difference in base thickness due to the thickness of the base itself, resulting in overprint graphics...
Because thick and thin bases can produce graphic and text size errors in printing, the base thickness should be reduced in color sequence to avoid overprinting errors in the printing process.
3. The rubber layout part is loose and the different blankets are tight on the rollers. Due to the uneven distribution of surface tension, the stress in some areas is loose. In this way, during the printing process, the elongation of the blanket in the stretched area is small. The change in size is small; the stretched area of ​​the stretched blanket has a large elongation and the graphic size changes greatly. Therefore, uneven elasticity of the layout of the rubber will lead to localized image registration errors. Therefore, when changing the blanket, you should pay attention to:
1) The blanket must be cut properly, and then it should be rectangular after being clamped so that the stress on the surface can be even;
2) The strength of the splint screw should be as uniform as possible;
3) The splint should be positive 4) The length of the dragging pad should be the same.
4. The tightness of the blanket caused by the deformation characteristics of the blanket resulting in the size of the graphics caused by the registration error, mainly from the roller pressure and tension and the quality of the blanket itself. The different degree of tightness of the blanket not only produces correspondingly different frictional forces on the surface of the cylinder, but also has a close relationship with the deformation of the blanket and the elongation caused by the elongation of the graphics. According to the law of deformation of leather cloth, its pushing deformation depends on two points:
1) The size and direction of friction;
2) The elongation of the blanket.
In other words, under the same direction and the same size friction, if the blanket itself has different elongation, the degree of deformation will inevitably be different. At the same time, the degree of tightness of the blanket on the roller also determines the blanket of the blanket. The elongation of it and the friction, that is, the more tightly stretched, the smaller the elongation during the printing process, the smaller the graphic size change, but the increase in the amount of friction on the layout; otherwise, the elongation is large, and the layout The amount of friction is also reduced accordingly. According to the tension of the blanket, the graphic change caused by the cause of the registration error, in the operation should pay attention to:
1) Should use rubber blanket printing with less elongation;
2) The tightness of the blanket should not be too loose or too tight and must be kept constant;
3) The registration error caused by the dimensional change of the graphics and text caused by the tightness of the blanket must not exceed 0.10 mm. Otherwise, the color shift may occur due to misalignment of the dots.
Third, mechanical overprinting is not allowed This is due to the lack of mechanical structure design and the adjustment of the use of errors and institutional wear caused by overprinting is not allowed. This type of overprinting is inaccurate (such as misregistration of the register, poor design and manufacturing accuracy of the cylinder, wear of the parts, etc.) and overprinting due to mechanical misalignment (such as roll paper) The paper force is not adjusted well, and the local adjustment error of the roller gear pitch circle causes a registration error. In order to avoid this type of overprinting is not allowed, the operator is required to use and adjust the machine in the correct way when adjusting the register; on the other hand, it must also pay attention to maintenance and timely maintenance.
In summary, we can see that the accuracy of color newspaper registration is affected and restricted in many ways. In addition, the last step of prepress preparation for color newspapers—adjustment rules—is an important factor determining the quality of color report printing. Although each version has overprinted ten lines or other overprint marks, merely achieving these mark registrations does not mean the first overall color paper registration, but also pay attention to local (fine level) registration. For example, in color newspapers, the features and features of the characters, eyelids, eyebrows, lips, etc.; some fine designs, signs, etc. in the advertisements. Their registration directly determines the quality of the color newspapers. Therefore, in the operation, after the registration line (or mark) is substantially aligned, the boundaries of each dot of the dot and the real block must be observed with a magnifying glass, and fine adjustment of certain special parts is performed, so as to achieve the entire set of the picture. quasi.
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