One-time completion of two "indentation processes"

In some parts printing and decorating printing processes, it is often necessary to add indentation processes, such as notes, memos, book covers, invitations, and some decorative printing products. According to the traditional printing process, the "printing" process is completed first, that is, the graphic is printed first, and then the indentation process is performed. This printing of its production efficiency and product overprint quality, are not satisfactory. Through production practice and exploration, the author carried out the process innovation and improvement of the prints containing the indentation process, so that the products that originally needed to be completed in two passes could realize the production process of light and dark one-time printing, thus greatly improving the printing efficiency and product quality. The printing process is described as follows:

1. Printing type

DT400 type four open automatic platform printing press has the advantages of high printing precision, high speed, large and uniform printing pressure, and convenient operation, in particular, the machine has good printing adaptability and high degree of automation, and is a set of bright and dark technology. The ideal choice.

2. Lining process improvement

In order to quickly and easily realize a light and dark one-time printing process, the conventional letterpress lining process must be improved as necessary. The inner lining should be thinner by 0.7mm, that is, the amount of lining inside the lining layer should be reduced by an appropriate amount, and the lining layer should be made outside. The corresponding increase. In this way, after the thickness of the outer liner is increased by 0.7mm, it can be carried out very dexterously: the local increase and decrease adjustments facilitate the rapid realization of the transition of the process of one-off printing of light and shade. Therefore, the increase or decrease in the adjustment of the outsole gasket material is an important measure for complying with the requirements of the characteristics of the embossing and printing one-off printing process and improving the printing efficiency and quality.

3. The selection and correct adjustment of the ink roller

Bright and dark one-time printing process is carried out under the condition that the dark and bright layout is adjusted to a slight difference. When printing, the printing plate should be evenly inked, and the dark marks should not be inked. This requires that the ink roller should have a good accuracy, so the ink roller should use ink roller with no eccentricity, no bending deformation, high precision of the shaft and shaft, so as to ensure uniform ink. The height and position of the ink roller are adjusted so that the ink can be uniformly applied to the plate, and the roller can maintain a proper contact with the roller, so that the ink can be uniformly received. However, the contact pressure with the steel roll must not be emphasized so as not to cause the ink roller to be pressed and deformed so that the dark mark surface is exposed to the ink.

4. Layout height adjustment

For printed note products, as long as the letter head layout more than 0.7mm, so that it can form a difference with the dark mark layout, easy to make the Mingyin layout receive ink, and the dark printing plate due to lower than the bright printing plate Ink. As the bright printing plate surface is increased, the corresponding outer liner must be reduced accordingly. To do this, the outer lining should be made of a 70-gram kraft paper. However, on the back of this kraft paper, it should be affixed with a piece of white paper with moderate dimensions and a thickness of 0.7 mm. Printed products have a uniform pressure on the dark and bright surface to ensure print quality. If printing products that require creases, such as books and magazines, press the edge of the book, etc., as long as the bottom of the indented steel blade is grinded down to about 0.7 mm below the surface of the clear printing plate, and then the indentation knife is directly connected to The plate surface is combined to make the plate, so that the ink is slightly lower than the surface of the plate when printing. However, it forms a gap with the lining. Therefore, a hard padding material with a suitable thickness, such as a white paper stick, should be placed on the indented part of the outer liner so as to meet the indentation condition so as to realize a one-off printing process with light and dark.

In summary, the use of a one-off printing process with bright and dark 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 production practice, the author adopted a one-off printing process for dark-marked products, so that products that originally required two processes to complete could be completed at one time. The effect of this process has also been well valued by peers and customers, and it is a technological improvement that has value in promotion and use. ( Kang Qilai)