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1. Ink layer thickness and water-ink balance
The control of the ink hue in the printing process is mainly achieved by controlling the thickness of the ink layer. When the thickness of the ink layer changes by about 0.1 μm, it will cause a color difference of △ E = 1.5 ～ 4.5NBS. Obviously, this effect is great. The ink color reproduction of offset printing is closely related to the balance of water and ink. Under the same ink volume, large water and small water will affect the color depth. Correctly mastering the balance of water and ink, it is very important to pay special attention to the PH value of the wetting fluid. The principle of water consumption is to use as little water as possible without getting dirty.
2. Printing pressure
The size of the printing pressure has a great influence on the degree of ink transfer from the printing plate to the paper. When the printing pressure is insufficient, the transfer of the ink is insufficient and it is not suitable for printing; when the printing pressure is too large, due to the Ink spreads to blank areas other than pictures and text, and the ink transfer rate is not only not improved, but also brings other disadvantages, and is also not suitable for printing. Only within the proper printing pressure range can the printed matter with thick ink layer, clear image, rich tone and good color reproducibility be printed.
3. Printing speed
Increasing the printing speed will shorten the contact time between the printing surfaces, make dots false, reduce the ink transfer rate, and reduce the printing quality. In order to ensure the full contact of the printing surface and improve the printing quality, it is required to control the printing speed under a certain printing pressure to obtain a stable ink layer thickness.
4. Poor drying density
The density of the sample just printed on the same paper is higher, and the density of the sample after a period of time will decrease as the drying smoothness of the ink decreases. Because the density values ​​of the ink layer before and after drying are different, the hue of the printed image is also different. The ink just printed is still wet, and there is a difference between it and dry state. This is because the ink layer just printed has a certain leveling, so the surface reflection is mainly specular reflection, which looks bright and shiny. When the ink layer is in a dry state, the surface reflection is mainly diffuse reflection, and the color is naturally dull and dull than when it was just printed. Therefore, the ink color of the general printed sample is slightly darker than the standard sample, but how much deeper should be controlled by data. During the proofing, the density value of each color just printed is measured. During printing, referring to these density values ​​to print, you can make two The ink colors of these people are nearly the same. The density meter with polarizing color filter can eliminate the light generated by the specular reflection on the surface of the ink layer. The measured wet color density is very close to the dry color density.
This is a good machine for making twisted paper ropes in roll, you can use the twisted ropes to wrap the gifts or for craft products, Paper Handle after knotted or tipped at the two ends or you can use it on the paper handle making to make different paper handles. It is running stably and fast and the rope diameters can be different and adjustable and customized according to customers` request. The rope can be made in different ways by using one paper roll, 2 rolls or more, which depends on the rope tightness, strongness, roundness and colors
Twins Head Rope Making Machine
Paper Rope, Paper Cord, Paper Rope Making Machine, Paper Cord Making Machine, Paper Rope Machine
DongGuan FeiYang Packaging Machinery Equipment Co., Ltd , https://www.feiyang-machinery.com