In some parts printing and decoration printing processes, it is often necessary to add an indentation process, such as notes, notes, book covers, invitation products, and some decorative printing products (with creases), which are produced according to the traditional printing process. Complete the "printing" process, that is, print the text first, and then perform the indentation process. In this way, the production efficiency and product overprint quality of printing are not satisfactory.
Through production practice and exploration, the author has carried out process innovation and improvement on the printed parts containing the indentation process, so that the product that originally needs to be done in two processes can realize the production process of one-time printing of light and dark, which greatly improves the printing. Ergonomics and product quality. The printing process operation process is introduced as follows:
1. Improvement of lining process
In order to realize the one-time light and dark printing process quickly and easily, the traditional embossing lining process must be improved, that is, the inner lining should be thinned to 0.7mm, and the amount of padding within the lining layer should be reduced by an appropriate amount, and the lining layer should be made accordingly. Increase. In this way, after the thickness of the outer lining layer is increased by 0.7mm, local increase and decrease adjustments can be easily performed, which is convenient for quickly realizing the process transition of light and dark printing. Therefore, the increase and decrease adjustment of the outsourcing padding material is to comply with the requirements of the gravure light and dark one-time printing process and is an important measure to improve the printing efficiency and quality.
2. Selection and correct adjustment of the inking roller
The one-time light and dark printing process is realized when the height of the light and dark layout is adjusted to be slightly different. When printing, make sure that the printing plate can be evenly inked, while the dark marks are not stained with ink. This requires that the inking roller should have good accuracy. Therefore, the inking roller should adopt an ink roller with no eccentric core, no bending deformation, and high accuracy of the shaft core and the shaft head, so as to ensure uniform ink inking. The height position of the inking roller is adjusted so that the surface of the printing plate can be evenly inked, while maintaining proper contact with the string roller, so that the ink can be evenly received. However, the contact pressure with the iron roller must not be overweight, so as not to deform the ink under pressure and make the dark stained surface get into the ink.
3. Adjustment of layout height
For printed note products, as long as the letterhead layout is more than 0.7mm high, it can form a height difference with the dark mark layout, which is convenient for the printed surface to receive ink, and the dark printed surface is not stained with ink because it is lower than the printed surface . As the surface of the printing plate is increased, the corresponding outer liner should be thinned accordingly. For this reason, a 70g kraft paper wrapper should be used for the outer lining, but a piece of white paper with a moderate format and a thickness of 0.7mmm should be stuck on the back of this kraft paper corresponding to the dark mark layout, so that the printed product The pressure of the light and dark plates is even to ensure the printing quality. For printing products that require creasing, such as books and periodicals, spine and other products, as long as the bottom of the indentation steel blade is ground with a grinder to about 0.7mm below the printed surface, then the indentation knife is directly combined with the printed surface Group printing, so the steel blade is slightly lower than the printing surface and no ink is printed. However, it is used to paste hard padding with appropriate thickness on the lining part, such as sticking whiteboard paper strips, so as to meet the indentation conditions to realize the one-time printing process.
In summary, the use of one-time light and dark printing process not only greatly improves the printing efficiency, but also significantly improves the quality of the product's overprint. At the same time, it also reduces the loss of raw materials and improves economic efficiency. For many years, in the production practice of the machine, the author used the dark and dark one-time printing process for the products containing dark marks, so that the products that originally required two processes can be completed in one time. The effect of the implementation of the process has also been well evaluated by peers and customers, and it can be regarded as a technical improvement with popularization and use value.
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