According to the type of gravure used and the printing method, gravure printing can be divided into four categories: hand-engraved gravure printing, chemical etching gravure printing, electronic engraving gravure printing and indirect gravure printing. Gravure printing machines can be divided into unit type and satellite type; sheet-fed gravure printing machine and web gravure printing machine; monochrome gravure printing machine and multi-color gravure printing machine, etc. This article will introduce you the quality of gravure printing machine.
The printing speed of the gravure printing machine is mainly determined by the length of the transmission distance between the colors of the printing machine. Since there will be color registration on the printed product, if the ink of the front color is not dried, the ink of the latter color will dissolve the ink in front, which will cause color problem. Therefore, if the distance between the inks of the gravure printing machine is larger, the longer the natural drying time, the higher the printing speed. On the contrary, it is difficult to increase the printing speed.
Secondly, the printing speed is determined by the effect of the drying box. The drying effect of the drying box is good, and the more thorough the drying of the ink, the not only the ink of the front color can be dissolved, and the residual of the solvent is relatively reduced. Gravure inks are blown dry by hot air rather than hot baked. First, when the gravure ink is heated, the conjunctiva is very fast, and the coating of the color film may affect the volatilization of the solvent in the ink, which may cause the ink to dry.
Since the unwinding tension of the device adopts the tension controller + magnetic powder brake + tension sensor, and the winding tension is controlled by the frequency converter, the difficulty of the equipment lies in the control of the winding tension, and the tension is appropriate: the tension is too small, It will be slack when winding up; the tension is too large, and the material is easy to wrinkle when winding. In addition, since the diameter of the paper is constantly increased at the time of winding, if the rotation speed of the winding is kept constant, the winding speed of the paper becomes larger and larger, which is liable to cause the paper to be broken.
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