Black and White Book Printing Signing Ttechniques

To ensure the stability and uniformity of ink color in the production of book and periodical printing, the signing system plays a crucial role. In the traditional printing production process, there are many techniques involved in signing. Firstly, if the same type of book is printed on one machine, after about 1000 sheets are printed, a large page with uniform ink color, beautiful text, and full dots is selected as the sample, with one sheet used as a hanging sample and another sheet folded and placed on the proofing table for comparison at any time. This is mainly because many printing factories currently have significant differences in environmental conditions due to limited conditions, especially different personnel working day and night. Natural light (cloudy, sunny) or lighting conditions may not meet the standards. The distance, angle, and lighting intensity of hanging sample sheets will affect human vision, resulting in differences in the printed products. The sample sheets on the proofing table can be referenced anytime, anywhere, at any angle, which is effective in solving this problem.

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Secondly, if the same type of book or periodical needs to be printed on different types of printing machines simultaneously, taking the example of J2205 (05 machine) and JS2101 (BB machine) produced by Beiren, there are significant differences in the quality of printed products due to different machine types. The product printed by the 05 machine has full dots, thick ink color, and beautiful text. For the ink color suitable for the 05 machine, the BB machine has to catch up, leading to quality problems such as dirty printing, font deformation, and a large increase in dot expansion rate. In this case, the signing of the ink sample needs to take into account the defects inherent in the BB machine. To prevent unnecessary quality accidents and ensure the uniformity of ink color in the product, the ink color sample printed by the BB machine is more suitable.

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Thirdly, in the book and periodical printing process, the use of ink in the printing factory is relatively fixed, and the choice of paper has a certain impact on the signing. In the drying process of ink, some parts belong to permeation drying. The use of paper with relatively poor smoothness, due to its high ink absorption, results in a significant drop in ink density after drying. Usually, ink color that is suitable when the imprint is wet becomes gray and faint after drying. Therefore, when signing, it is necessary to consider making the ink color slightly larger.

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In summary, for different products, equipment, and raw materials, the signing process should be flexibly mastered, and quantification or simulation of quantification is essential.