For the factors that affect the accuracy of overprinting, take appropriate control measures to achieve the purpose of overprinting accurately.
1. For the roasting treatment of the printing plate, the temperature in the oven must be even, so that the plate is heated evenly, the temperature should not be too high, and the time should not be too long. Short version or product with high precision is best not to bake.
It is necessary to standardize the operation of the school edition. The layout of the plate is centered, the plate is mounted on the plate, and the plate screws are fastened. When you pull it, tighten the screws. As long as the force is moderate, deformation of the plate is generally avoided.
2. The center distance of the rollers is strictly measured according to the standard, and it must be done that the roller axis lines are horizontal and the lining calculation is accurate. After a good lining, do a stress test. Generally use "play screen", "draw map", "pressure bar", etc., to ensure that "pressure flat" to meet the printing accuracy requirements.
3. It is difficult to solve the effect of paper on overlay accuracy, and there are many related factors. In order to improve the printability of the paper and enhance its stability, the temperature and humidity of the printing environment should be kept relatively constant. At the same time, according to the "hysteresis effect" of the paper, prepress processing of the paper is done.
The commonly used method is hanging and the paper is hung by hanging, so that its moisture content is relatively balanced with the air humidity, which can reduce the sensitivity of the paper to the environment.
For high-precision prints, it is also possible to use a method in which water is printed on the paper first, so that the paper can absorb water and be pressed sufficiently to deform the paper before overprinting. This is better for "slewing angle" and expansion, but at a higher cost.
4. The printing process requires the use of minimal water in the case of guaranteed non-dry version.
5. Mechanical overprinting is inaccurate, mainly rule components and tooth decay. The requirements of the pre-gauge are: According to the thickness of the paper, adjust the height position correctly, and the connection line of the front regulation paper point is parallel to the axis of the drum; the requirements of the pull gauge are: pull the paper reliably, moderate tension, and block the axis of the paperboard and the drum Vertically.
Each paper and paper feeder must ensure that the paper runs straight. The grippers must have uniform gripping force and accurate closing time. When the two teeth are handed over to each other, they must have enough time for mutual annihilation to ensure effective control of the paper. In addition, the rollers and the shaft must be free from turbulence.
Satisfy the above requirements, under normal circumstances can improve the overlay accuracy, achieve control purposes.
1. For the roasting treatment of the printing plate, the temperature in the oven must be even, so that the plate is heated evenly, the temperature should not be too high, and the time should not be too long. Short version or product with high precision is best not to bake.
It is necessary to standardize the operation of the school edition. The layout of the plate is centered, the plate is mounted on the plate, and the plate screws are fastened. When you pull it, tighten the screws. As long as the force is moderate, deformation of the plate is generally avoided.
2. The center distance of the rollers is strictly measured according to the standard, and it must be done that the roller axis lines are horizontal and the lining calculation is accurate. After a good lining, do a stress test. Generally use "play screen", "draw map", "pressure bar", etc., to ensure that "pressure flat" to meet the printing accuracy requirements.
3. It is difficult to solve the effect of paper on overlay accuracy, and there are many related factors. In order to improve the printability of the paper and enhance its stability, the temperature and humidity of the printing environment should be kept relatively constant. At the same time, according to the "hysteresis effect" of the paper, prepress processing of the paper is done.
The commonly used method is hanging and the paper is hung by hanging, so that its moisture content is relatively balanced with the air humidity, which can reduce the sensitivity of the paper to the environment.
For high-precision prints, it is also possible to use a method in which water is printed on the paper first, so that the paper can absorb water and be pressed sufficiently to deform the paper before overprinting. This is better for "slewing angle" and expansion, but at a higher cost.
4. The printing process requires the use of minimal water in the case of guaranteed non-dry version.
5. Mechanical overprinting is inaccurate, mainly rule components and tooth decay. The requirements of the pre-gauge are: According to the thickness of the paper, adjust the height position correctly, and the connection line of the front regulation paper point is parallel to the axis of the drum; the requirements of the pull gauge are: pull the paper reliably, moderate tension, and block the axis of the paperboard and the drum Vertically.
Each paper and paper feeder must ensure that the paper runs straight. The grippers must have uniform gripping force and accurate closing time. When the two teeth are handed over to each other, they must have enough time for mutual annihilation to ensure effective control of the paper. In addition, the rollers and the shaft must be free from turbulence.
Satisfy the above requirements, under normal circumstances can improve the overlay accuracy, achieve control purposes.
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