Introduction

When the gravure printing machine is printing, the plate cylinder is full-faced with ink, and the ink in the blank part of the plate is scraped off with a squeegee to leave the ink in the graphic part, and then the paper is passed and imprinted on the back of the paper by the impression cylinder. The ink in the concave portion is directly transferred to the paper surface, and finally, the printed portion is piled or recoiled by the paper receiving portion.

Printing method

The gravure printing machine is directly printed by a round press circle, and the printing plate is directly formed on the printing plate cylinder. The ink is supplied by ink immersion or ink jet, and there is no ink distribution mechanism. Due to the thick ink layer, the use of fast-drying inks with strong volatility requires a drying device.

1. Models are divided into sheet-fed and web-fed gravure presses depending on the use of paper.

2. The number of colors printed by the unit is one-time, four-color, five-color, and six-color, and it is divided into single-sided printing and double-sided printing.

The main structure

The main structure of the gravure printing press is composed of five parts: paper feeding, ink feeding, printing, drying, and taking paper.

1. In the paper feeding section, the sheet-fed gravure printing machine is a paper stacking single-sheet continuous feeding, and the web gravure printing machine is continuously feeding paper with a web.

2. In the printing section, there are three vertical, horizontal and inclined arrangements of the printing plate cylinder and the impression cylinder, and the printing plate cylinder is arranged below. Each unit generally has 1 plate cylinder and 1 impression cylinder. In order to increase the printing pressure, some are equipped with 2 impression cylinders.

3. The ink supply device has direct ink feeding for partially immersing a plate cylinder in an ink tank and indirect ink supply for transferring ink to a plate cylinder by an ink-discharging roller immersed in an ink tank, and some of the high-speed machines also use spray. Ink mode.

4, the drying part is the use of electricity or steam heating hot air, and some use infrared or far infrared light to print dry.

5, the delivery section, sheet paper is stacked into a pile of paper, roll paper is to fold or fold the paper folded into a paper roll. The structure of the printing part of the multicolor gravure printing machine for webs is organic and satellite. The former is to set the units according to the required number of colors. Each unit has one plate cylinder and one to two impression cylinders. The take-up part is a rewind method. The satellite type four-color gravure printing machine has a large impression cylinder and four sets of plate cylinders in the printing section. There are also combinations of gravure printing with lithographic or letterpress printing, die cutting, etc., to suit the different requirements of the printed matter.