Wuhan Handern gravure printing technology
DATE：2021/2/3 8:48:10 / READ： / SOURCE：This station
Wuhan Handern gravure printing technology
PVC printing ink should be diluted before use. The composition and proportion of yangshibie should be adjusted according to the climate and printing speed. Generally, the equal proportion of liebinghuang and kusanlate are used. The ratio of ink and diluent is usually 2:10(1) The density printing plate of photogravure is generally composed of four small square dots, and the color density is determined by the} intensity of the dots. Even if the area of the four point phase ah, due to the depth of the bullet, the version of the thick reading is not the same, the thick version of the depth of 10um, I only 2rm, with the ink to fill the depth of the version and reproduction. EVA solar film production line www.handern.com
(2) Photogravure plate making engineering photogravure plate making engineering is made in the following order.
① The negative film is made according to the original photography, and then the positive film is obtained by printing or drawing.
② Carbon paper sensitization.
③ Sun carbon paper, screen line, that is, the sun to the carbon paper, when the sun screen line to 150 ~ 170 lines (called white line screen).
④ Over printing transfers the pattern of the positive film on the printing line to the surface of the printing roller. This process is called over printing.
⑤ Develop with warm water, wash the uncured adhesive layer according to the hardening degree of gelatin on plain paper, and leave the adhesive layer of pattern and mesh on the roller. The thickness of the adhesive layer is related to the hue level of the positive film. When the plate is rotten, these different thicknesses of the adhesive layer will protect the plate covered by it to varying degrees.
⑥ According to the different depth of the pattern, different concentrations of ferric chloride aqueous solution are applied to the copper roller. The corrosive solution passes through the solidified film, and the solidified layer is insoluble. The metal copper not covered by the solidified film is corroded, and the gravure of reproduction level can be made. EVA solar film production line www.handern.com
⑦ The gelatin is cured by acid pickling, and the plate is chrome plated,
⑧ In order to ensure the accuracy of overprint, in plate making the first to make it strong.
Color to the last color of the plate roll diameter must be based on product specifications
In order to make up for the mechanical defects, the 1-3 color plate roller increases by 0 m, the 4-color plate roller increases by 10 / m than the 3-color plate roller, and the 5-color plate roller and 4-color plate roller have the same diameter or 0-10 / m.
(3) The basic process of photogravure printing the basic mechanism of photogravure printing is composed of copperplate, presser, scraper and ink disk. The ink is filled with the grooves arranged in checkerboard pattern, the surplus ink on the surface is removed by the scraper, and the ink is transferred to the plastic film by the pressure of the pressure roller.
Photo gravure multicolor press is shown in Figure 12-25. Prepare several gravure coating dryers to dry each color. In the process of plastic film printing, due to the traction, the printing size changes, that is, the color orientation is very large. Therefore, each unit uses the photoelectric cell to carry out automatic alignment. In addition, in order to reduce the expansion and contraction of the film, a rotary printing press as shown in Fig. 12-26 is adopted. The copper plate device is placed around the big pressure roller with rubber or felt on the surface, so that the tension of multi-color printing can be controlled under the condition of stable expansion and contraction. EVA solar film production line www.handern.com
Author：admin