How to realize the two-time indentation process in

2022-08-26
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How to achieve two "indentation processes" in one time

in some parts printing and decoration printing processes, it is often necessary to add an indentation process, such as notes, letters, book covers, invitations and some decoration printing products. According to the traditional printing process, the surface printing process is completed first, that is, the pictures and texts are printed first, and then the indentation process is carried out. In this way, the production efficiency and product overprint quality of printing are not satisfactory. Through production practice and exploration, the author has innovated and improved the process of printing parts with indentation process, so that the products that originally needed to be finished in two passes can be printed on one equipment at a time, and the production process of digital push-pull meter, tension and compression two-way sensor, and calibration brush of dynamometer can be realized, which greatly improves the printing efficiency and product quality. Now the operation process of the printing process is introduced as follows:

1. The printing machine type

dt400 four open automatic platform printing machine has the advantages of high printing accuracy, fast speed, large and uniform printing pressure, and convenient operation. In particular, the machine has good printing adaptability and high degree of automation. It is an ideal choice to realize the integration of light and dark technology in one machine

2. Improvement of lining process

in order to realize the light and dark one-time printing process quickly and conveniently, we must make necessary improvements to the traditional embossing lining process. We should wholeheartedly reduce the inner lining by 0.7mm, that is, reduce the amount of padding inside the lining layer, and increase the outer lining layer correspondingly. In this way, after the thickness of the outer lining is increased by 0.7mm, it can be carried out very conveniently: local increase and decrease adjustment is convenient to quickly realize the process transition of one-time printing. Therefore, it is an important measure to adjust the increase or decrease of the outer packing material to comply with the requirements of the characteristics of the embossing light and dark one-time printing process and to improve the printing efficiency and quality

3. selection and correct adjustment of inking roller

the light and dark one-time printing process is carried out under the condition that the height of the light and dark layout is adjusted to a slight difference. When printing, make sure that the printing plate can be inked evenly, and the dark mark plate is not stained with ink. This requires that the inking roller should have better accuracy, so the inking roller should be non eccentric, non bending deformation, shaft core and shaft head with high accuracy, so as to ensure uniform inking. The height position of the inking roller is adjusted so that the layout can be inked evenly, and the inking roller can be kept in moderate contact, so that the inking can be received evenly. However, the contact pressure with the steel roller must not be biased, so as not to deform the ink roller and make the dark mark layout stained with ink

4. adjustment of layout height

for printing memo products, as long as the letterhead layout is padded 0.7mm higher, it can form a height difference with the dark mark layout, which is convenient to bring confidence to the extruder enterprise. The printing layout is inked, and the dark printing layout is not inked because it is lower than the surface printing layout. As the surface printing layout increases, the corresponding outer lining will be thinned accordingly. For this reason, a 70g kraft paper should be used as the outer lining, but a white board with a moderate width and a thickness of 0.7mm should be pasted on the back of this kraft paper where it corresponds to the dark mark plate, so that the pressure of the light and dark plate of the print can be uniform and the printing quality can be guaranteed. If the printing of products that need to be creased, such as the ridge mark on the cover of books and periodicals, as long as the bottom of the indented steel blade is protected by a grinding wheel, the pressing ring is checked in and ground down to about 0.7mm lower than the surface printing plate, and then the indenting blade is directly combined with the surface printing plate to form a plate, so that the steel blade is slightly lower than the surface printing plate without inking during printing. However, it forms a gap with the outer lining, so the indentation part of the outer lining should be padded with hard padding with appropriate thickness, such as white board and paper strips, so as to meet the indentation conditions and realize the one-time printing process

to sum up, using 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 benefits. For many years, in the production practice, the author has adopted the one-time printing process for the products with dark marks, so that the products that originally needed two processes can be completed at one time can be better completed. The implementation effect of this process has also been well criticized by peers and customers, which is a technical improvement with promotion and use value

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