In some parts printing and decorating 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. After completing the "printing" process, the graphic is printed first, and then the indentation process is performed. This printing is inferior to the production efficiency and product overprint quality.
　　
Through the production practice and exploration, the author has carried out technological innovation and improvement on the printing products containing the indentation process, so that the products that need to be completed in two processes can realize the production process of light and dark printing, which greatly improves the printing. Work efficiency and product quality. The printing process operation process is as follows:
　　
First, the improvement of the lining process
　　
In order to realize the light and dark one-time printing process quickly and easily, it is necessary to carry out the necessary improvement on the traditional embossing lining process, that is, the inner lining is thinned to 0.7 mm, the inner lining of the lining layer is reduced by an appropriate amount, and the lining layer is externally correspondingly Increase. After the outer liner is increased by a thickness of 0.7 mm, the local increase and decrease adjustment can be performed very flexibly, so that the process transition of the light and dark one-time printing can be quickly realized. Therefore, the adjustment and adjustment of the outer liner material is in line with the requirements of the gravure printing process, and is an important measure to improve the printing efficiency and quality.
　　
Second, the selection and correct adjustment of the inking roller
　　
The light and dark one-time printing process is realized when the brightness and darkness of the screen are adjusted to be slightly different. When printing, the printing surface should be evenly inked, and the dark surface should not be inked. This requires that the inking roller should have better precision, so the inking roller should adopt an ink roller that is not eccentric, does not bend, and has high precision of the shaft core and the shaft head, so as to ensure uniform ink. The height adjustment of the inking roller can not only make the printing surface evenly inked, but also maintain proper contact with the string roller, so that the ink can be uniformly received. However, the contact pressure with the iron roller should not be biased, so as to prevent the ink from being deformed by pressure and causing the dark surface to be stained with ink.
　　
Third, the adjustment of the layout height
　　
For printing notes, as long as the letterhead is 0.7mm higher, it can form a high and low difference with the dark surface, which is convenient for the printing surface to be inked, and the dark printing surface can not be inked because it is lower than the printing surface. . As the printing plate is increased, the corresponding outer lining will be correspondingly thinned. To this end, the outer lining should use a 70g kraft paper, but on the back of the kraft paper and the dark surface, a piece of white paper with a moderate thickness and 0.7mmm thickness should be applied. The light and dark layout is evenly pressed to ensure print quality. If you want to print products that require creases, such as book covers, spine ridges, etc., as long as the bottom of the indentation steel blade is ground to a thickness of about 0.7 mm below the surface of the printing plate, and then the indentation knife is directly combined with the printing plate. The group version, so that the steel blade is slightly lower than the printing plate when printing. However, the padding portion and the lining portion are padded with a proper amount of hard padding, such as a whiteboard strip, to meet the indentation condition, so as to achieve a light and dark one-time printing process.
　　
In summary, the use of the light and dark one-time printing process not only greatly improves the printing efficiency, but also significantly improves the overprint quality of the product. At the same time, it also reduces the loss of raw materials and improves economic efficiency. Over the years, in the practice of the production of the machine, the author used the light and dark printing process for the products containing dark marks, so that the products that had to be completed in two processes could be completed at one time. The effect of the implementation of the process has also been well evaluated by peers and customers, and it is a technological improvement with the promotion of use value.
　　
Through the production practice and exploration, the author has carried out technological innovation and improvement on the printing products containing the indentation process, so that the products that need to be completed in two processes can realize the production process of light and dark printing, which greatly improves the printing. Work efficiency and product quality. The printing process operation process is as follows:
　　
First, the improvement of the lining process
　　
In order to realize the light and dark one-time printing process quickly and easily, it is necessary to carry out the necessary improvement on the traditional embossing lining process, that is, the inner lining is thinned to 0.7 mm, the inner lining of the lining layer is reduced by an appropriate amount, and the lining layer is externally correspondingly Increase. After the outer liner is increased by a thickness of 0.7 mm, the local increase and decrease adjustment can be performed very flexibly, so that the process transition of the light and dark one-time printing can be quickly realized. Therefore, the adjustment and adjustment of the outer liner material is in line with the requirements of the gravure printing process, and is an important measure to improve the printing efficiency and quality.
　　
Second, the selection and correct adjustment of the inking roller
　　
The light and dark one-time printing process is realized when the brightness and darkness of the screen are adjusted to be slightly different. When printing, the printing surface should be evenly inked, and the dark surface should not be inked. This requires that the inking roller should have better precision, so the inking roller should adopt an ink roller that is not eccentric, does not bend, and has high precision of the shaft core and the shaft head, so as to ensure uniform ink. The height adjustment of the inking roller can not only make the printing surface evenly inked, but also maintain proper contact with the string roller, so that the ink can be uniformly received. However, the contact pressure with the iron roller should not be biased, so as to prevent the ink from being deformed by pressure and causing the dark surface to be stained with ink.
　　
Third, the adjustment of the layout height
　　
For printing notes, as long as the letterhead is 0.7mm higher, it can form a high and low difference with the dark surface, which is convenient for the printing surface to be inked, and the dark printing surface can not be inked because it is lower than the printing surface. . As the printing plate is increased, the corresponding outer lining will be correspondingly thinned. To this end, the outer lining should use a 70g kraft paper, but on the back of the kraft paper and the dark surface, a piece of white paper with a moderate thickness and 0.7mmm thickness should be applied. The light and dark layout is evenly pressed to ensure print quality. If you want to print products that require creases, such as book covers, spine ridges, etc., as long as the bottom of the indentation steel blade is ground to a thickness of about 0.7 mm below the surface of the printing plate, and then the indentation knife is directly combined with the printing plate. The group version, so that the steel blade is slightly lower than the printing plate when printing. However, the padding portion and the lining portion are padded with a proper amount of hard padding, such as a whiteboard strip, to meet the indentation condition, so as to achieve a light and dark one-time printing process.
　　
In summary, the use of the light and dark one-time printing process not only greatly improves the printing efficiency, but also significantly improves the overprint quality of the product. At the same time, it also reduces the loss of raw materials and improves economic efficiency. Over the years, in the practice of the production of the machine, the author used the light and dark printing process for the products containing dark marks, so that the products that had to be completed in two processes could be completed at one time. The effect of the implementation of the process has also been well evaluated by peers and customers, and it is a technological improvement with the promotion of use value.
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