The method of controlling ink balance in the hotte

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Commercial rotary machine control ink balance method

the high-speed and high-quality printing machine introduced from abroad has outstanding advantages such as high printing speed (some machines speed up to 60000 RPM), many printing pages, stable quality and strong timeliness

as a new printing machine (previously, commercial printing was mainly based on sheet fed machines), it has many similarities with sheet fed machines, but it has many differences, such as: paper feeding mechanism, printing speed, paper used for printing, ink drying method, folding method, quality standard, paper loss, etc. Therefore, we need a process to master it skillfully. We should summarize, communicate and study more, so as to be familiar with it and make good use of it

offset ink water balance refers to: under a certain printing speed and printing pressure, adjust the supply of innovative fountain solution, so that the proportion of fountain solution contained in emulsified ink is less than 26%, forming a slight w/o emulsion ink, and compete with the ink on the printing plate with the minimum supply. Offset printing uses the natural law that oil and water are immiscible with each other to form graphics and text and blank parts on the printing plate. It supplies both ink and water to the printing plate. Through the oil absorption and water resistance of the graphics and text of the layout, and the water absorption and oil resistance of the blank part, PPS, peek, PI and high temperature resistant PA are mainly introduced below

if in the ideal water ink balance state, the blank part of the printing plate is attached with the fountain solution, and the graphic part is attached with the ink, the printing effect is ideal only when the surface tension of the fountain solution and the surface tension of the ink are equal, the diffusion pressure on the interface of the two is zero, and the fountain solution and the ink maintain relative balance on the interface and do not infiltrate each other. But in the actual printing, the ink balance is a dynamic balance, which changes all the time. If the ink supply to the layout exceeds the balance, the ink will expand to the blank part after being strongly squeezed, invading the blank surface and causing dirt

on the contrary, if the water supply to the layout exceeds the balance value, when the water roller passes through the image and text surface, more water will be left on the image and text surface, and then after the strong extrusion of the water roller and the ink roller, the ink layer attached to the image and text part will be deeply emulsified, resulting in a dull impression. And when the water supply is too large, the water will enter the ink bucket along the ink transfer roller and the ink string roller, causing a wide range of ink emulsification, and finally making the printing impossible

in the actual printing operation, many operators do not pay attention to the balance of ink and water. When the water is too large, they do not consider receiving water, but increasing the amount of ink. The working principle of the printing machine: for a period of time, from the sole proprietorship of oil production to the establishment of research and development, the ink emulsification is serious, causing sticky dirt, and then add water, the ink color is naturally dim, and then add ink, which forms a vicious cycle. If you can't reach a better ink and water balance, you won't be able to print good products

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