The suitability of printing also has a great influence on the design, manufacture and use of printing machines. The so-called printability refers to the overall performance of the substrate, printing ink and Other materials that match the printing conditions and are suitable for the printing job. In addition to the printability of the above printing materials, in order to obtain good printability during printing, the structure of the printing machine should also be continuously improved. For example, in order to maintain continuous and stable ink supply, an ink stirrer is specially installed in the inking system to keep the printing ink stable in fluidity to achieve the normal transfer of ink.
As another example, the dampening device of a lithographic offset press must ensure that an appropriate amount of water can be supplied. Excessive water supply will cause emulsification of ink; too small water supply will easily cause dirty failure. The principle of controlling the amount of water supply is to reduce the water supply as much as possible under the premise of ensuring the printing quality, thereby prompting people to continuously improve the wetting device to meet the basic requirements of printability. In addition, in order to improve the transfer rate of ink, in addition to using different printing methods, printing speeds, printing inks and printing materials, improving the imprint mechanism is also an important measure. It can be seen that the specific structure and quality of the printing press are closely related to the printability.
In order to evaluate the printing press correctly, the printing press manufacturers and printing press users put forward the following three requirements for the printing press.
1. Performance
The working performance of the printing press mainly includes three indicators: overprint accuracy, ink color leveling and productivity.
â‘ Overprint accuracy
In the process of chromatic printing, the accuracy of the overlapping of prints is one of the main technical indicators of the working performance of the printing press. In the process of register printing, the conveyance, handover and printing of paper, etc., whether at low speed or high speed, should be able to ensure that they are in the specified position. For fine prints and color printing, this is even more important. This requires that the transmission system of the printing press, the position and time of the paper transfer and handover, and the transmission accuracy of the printing plate and the imprinting mechanism should meet certain requirements. Therefore, when we analyze the printing press, we must focus on understanding the various links related to overprint accuracy, mastering its characteristics and the role it plays.
â‘¡The ink color is solid
Uniform ink color refers to the consistency of the ink layer thickness of the printed product and the clarity of the ink mark. This is another indicator to measure the quality of the print, and is also an important content to evaluate the working performance of the printing press. Regardless of which printing method is used, to print a clear and solid ink, not only the ink color is uniform, but also sufficient printing pressure is required, which requires the printing device, including the inking system, to have higher accuracy and performance .
â‘¢Productivity
The productivity of the printing press is generally expressed in terms of printing speed. The method of expressing the printing speed is expressed in sheets / hour for a sheet-fed printing press; in m / min for a web press. The structure and characteristics of the printing machine and the technical level of the automatic control system are the main factors that determine the productivity. For example, the flattening press uses an impression cylinder, which has a significantly higher printing speed than the flattening press, but the reciprocating motion of its platen limits the further increase in productivity. Therefore, it is gradually printed by round presses. Replaced by machine. At present, printing presses are developing in the direction of large-scale, high-speed, and linkage, in order to maximize productivity.
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