What is relief printing: The printing part of the letterpress printing plate is higher than the blank part, and all the printing parts are on the same plane. When printing, apply ink to the printed part, because the blank part is lower than the printed part, so the ink cannot be adhered, and then the paper and other substrates are in contact with the printing plate, and a certain pressure is applied to transfer the ink on the printed part of the printing plate Go to the paper and get the printed product. Since the blank part is concave, the blank part on the printed product is slightly protruded when pressurized, and the surface forming the printed product has unnoticeable unevenness.
Main advantages:
1. Faster speed;
2. The equipment cost is lower than traditional offset printing and gravure printing;
3. It is convenient for group edition, easy to add and delete, and can be used for printing large quantities or very small batches of simple jobs;
4. The ink is thick, the gloss is strong, and the performance of the ink is good, about 80%;
5. The printing plate is embossed, the printing pressure is large, the bright color fonts and lines are clear, and the strokes are strong; the color strength and durability are stronger than offset printing, which is slightly worse than screen printing, but the level of expression and registration are stronger than silk. Screen printing and flexo printing.
Limitations:
1. Poor fonts will affect the lines; plate making is not easy to control;
2. There is a tendency to increase the number of outlets;
3. The rotary embossing machine adjusts the printing color difference by controlling the ink flow and printing pressure in the ink fountain; it is very unstable during the printing process, and often needs to rely on the experience of the operator to adjust it in real time;
4. Rotary relief printing machine printing on a large area, it is easy to appear uneven ink layer, or even the phenomenon of whitening.
But now the letterpress printing equipments have different grades. There are circular flattening relief printing machines, ordinary rotary relief printing machines, and professional slant-back, satellite or unit-type sticker printing machines, so they cannot be generalized.
Application field: suitable for printing on paper, plastic and self-adhesive labels.
Future trend: Letterpress is now replaced by offset printing in many fields, but only in the field of old letterhead, envelope and other text printing and carton packaging printing; in China, the technology and equipment used in the printing of stickers and other labels are still Focusing on letterpress printing, circular flattening and flattening flat letterpress printing equipment are gradually shrinking or even eliminated. Circular pressure round full-rotation and circular pressure reciprocating semi-rotary relief printing equipment have begun to be localized. It is beginning to bring a ray of vitality to ancient relief printing for mass printing.
International protagonists in the field of relief printing: Kepike, Sanqi, Lindeco, Iwasaki, Sanjo, Lianyi, etc .;
Domestic masters: Luo Tie (Taiwan), Wan Ji (Taiwan), Xinmin Taiyang, Hong Taixiang, Zhejiang Zhongtian, etc .;
End user representatives: Piaoying Group, Longliqi, Shanghai McCormick, etc.
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