Adjustment and maintenance of the hottest roller c

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Adjustment and maintenance of drum parts

the adjustment of drum parts will directly affect the normal use of offset press and the quality of printing products. In addition to the strict requirements on the machining accuracy of the drum parts, there should also be strict requirements on the adjustment of each part. Only in this way can the drum parts play a good role in offset printing and cooperate with other parts to jointly complete the task of exquisite printing (Encyclopedia). The following points should be achieved for the installation and adjustment of drum components

1) ensure that the radial runout of the plate cylinder, rubber cylinder and impression cylinder is within the allowable range. The drum is positioned by the fitting tolerance of the eccentric sleeve participating in the fitting work, and there must be a fitting cumulative error between them. The more eccentric sleeves participating in the fitting work, the greater the cumulative error, which will directly affect the axial and radial positioning accuracy of the drum. Therefore, we should pay special attention to the fitting clearance when installing the fitting drum shaft sleeve

2) the axial displacement of each drum shall not exceed 0.03mm, otherwise it will cause print quality failure

3) offset printing is a unique printing method that requires wetting the surface of printing plate with fountain solution. Offset fountain solution contains acidic substances and surface active substances, which will be corrosive to the surface of printing plate, rubber and embossing cylinder. In particular, the printing plate cylinder is in contact with the fountain solution for a long time. If the printing plate cylinder is seriously eroded, it will cause the unevenness of the printing plate surface, resulting in the deficiency of text points, light local printing pressure and other ills. Repairing the plate cylinder is a very troublesome thing

the enterprise has scientific and technological strength. In order to prevent the fountain solution from eroding the printing plate cylinder, the best way is to apply a layer of butter on both ends of the lining paper of the printing plate cylinder and rubber cylinder, and use the principle of oil-water repulsion to prevent the fountain solution from penetrating into the printing plate cylinder and rubber cylinder, so as to achieve the purpose of maintaining the printing plate cylinder

4) for the impression cylinder, in addition to ensuring the same requirements as other cylinders, attention should also be paid to the normal function of a set of teeth carried by the impression cylinder. Inaccurate overprinting and tearing of printed matter correctly set various operating parameters for the test according to the test requirements. Printing faults such as paper, wrinkle and ghosting are mostly caused by the abnormal condition of the gripper. Because these five factors play a decisive role, we should pay more attention to whether the working condition of the gripper is normal while maintaining the imprint cylinder. Regularly fill lubricating oil to keep it lubricated for a long time and work in a good lubricating state

5) each printing drum should be kept clean. For the printing plate and rubber drum, it is more important to ensure the cleanliness of the shoulder iron and a small number of exposed drum parts. If ink is stuck, it should be cleaned in time, otherwise it will accumulate ink around the drum body for a long time and form a block. The caked ink is located in the shoulder iron gap of the pressing cylinder, which affects the normal printing state of the cylinder, and will produce impact and jump at the bump of the ink layer, causing faults such as inaccurate ink bar or overprint

6) if the drum bearing, drum gear sleeve and other parts are not cleaned for a long time, the wear between them will be accelerated, which is detrimental to the machinery and equipment. Because the imprint cylinder is often exposed, the cylinder body is often affected by external factors, so pay attention to the maintenance of the imprint cylinder body. After each shift, the working surface should be cleaned in time, and the ink imprint adhered to it should be cleaned to keep the working surface clean

7) we should also deal with the clamping device of the printing plate cylinder in the process of use. If the data elongation exceeds 1000%, we can choose the stroke of 1000 or 1200mm Standardize the configuration problems and regularly check the rubber cloth crimping mechanism of the rubber drum. If any problem is found, it should be handled in time to keep the drum components in the best condition for operation

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