When printing on the gravure printing machine, the full plate of the plate cylinder is inked, and the ink of the blank part of the plate is scraped off by the squeegee to leave the ink of the graphic part, and then the paper is pressed, and the embossing roller is embossed on the back side of the paper. The ink of the concave portion is directly transferred to the paper surface, and finally the printed matter is piled up or rewinded through the delivery portion.
In addition to the number and number of colors used for printing paper, gravure printing machines can be divided into two categories according to the plate making method: engraving gravure and etching intaglio.
Mechanical engraving gravure
The mechanical engraving gravure is made by mechanically controlling the knives on the surface of the plate cylinder. It reduces the heavy work of hand engraving, the plate making speed is fast, the cycle is short, and the plate making cost is also low. Gravure printing machines are mainly used to make printed gravures of securities.
Due to the high cost of the above two engraving plates and the long plate making period, the scope of use is limited. But things are divided into two. In the case of anti-counterfeiting packaging, hand-engraved intaglio may be the best method of making plates. Because the secret anti-counterfeiting is a main method of anti-counterfeiting packaging, the technicians can use the various methods to engrave some hidden notes in the process of hand-engraving gravure. The hidden marks on these hand-carved intaglios are not easy to be found, and the gravure printing machine prints are even more Difficult to be distinguished, this forms a secret anti-counterfeiting.
2. Hand-carved gravure
The hand-engraved gravure is made by a technician using a knife to manually engrave the surface of the plate cylinder according to the original image, and the plate material can be made of copper plate or steel plate. Manual labor is heavy, plate making costs are large, and the cycle is long. However, the hand-engraved gravure lines are clear, and the prints are highly layered and difficult to forge. Gravure printing machines are mostly used to produce printed intaglios for securities and high quality art.
3. Electronic engraving gravure
This version is controlled by an electronic control device to engrave the surface of the plate cylinder. The gravure printing machine uses an electronic engraving machine to control the engraving knives according to the photoelectric principle, and engraves the cells on the surface of the drum, and its area and depth change at the same time.
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