The viscosity and fluidity of the ink play an important role in the printing quality. The fluidity and viscosity of the ink are closely related. The viscosity of the ink increases and the flowability of the ink decreases. On the contrary, the fluidity is increased. The thick ink does not equal to the viscosity. The ink with high viscosity is not necessarily thick. Only the ink with the same viscosity, the greater the consistency, the worse the fluidity.
At present, many small and medium-sized printing companies use monochrome offset printing machines to overprint color printing, simple printing and overprinting of two colors. Generally speaking, overprinting of single-color and four-colors is the most common, but there are also printing factories overprinting the front and back of a total of eight colors. This requires high-quality, high-precision printing presses, but also requires the printing operator more sophisticated technology, and ink should pay attention during the overprint process.
If the fluidity is too small, the transfer of ink during the printing process is not smooth and uneven, resulting in a shallow front and back depth on the same printing surface and other ink failures; the fluidity is too large, the imprinting cannot be transferred accurately, and the graphic level is not clear. Ink is not full, the color is not bright and clear, at the same time, the ink flow is too large can also lead to the production of dirty plates and ink bars.
In the printing process, the viscosity and fluidity of the ink can be adjusted by using ink transfer, but it is not recommended to add corn powder to the ink in order to make the print dry quickly. It can also be achieved by using fast-drying inks.
Therefore, in the printing process, the ink viscosity and fluidity should be adjusted. The preservation of ink has always been a headache for printing companies. Because the ink is left in the air for a little longer, it is easily oxidized by the air and forms a thick layer of ink. When the ink is taken for the next printing, it must be Scratching the ink, it is necessary to waste part of the ink.
It is advisable to use wax paper to isolate the ink from the air when it is stored, or to seal it with plastic paper. That is, wax paper or plastic paper is applied to the surface of the ink layer. The wax paper or plastic paper can be peeled off before the next printing, but it is best. Do not use plain paper for storage. Avoid tearing the paper and causing trouble.
The general measure taken by the printing factory is to add a certain amount of water to the ink cartridge to prevent the ink from contacting the air. However, in fact, oxygen contained in water also oxidizes the ink, and the contact time between water and ink is easy to emulsify the ink. When printing on the machine, there will be no inking phenomenon. Although the amount of ink is large, but uniform It is noteworthy that the ink roller (mainly the hard roller) is still not inked.
Applications: Printing quality and ink viscosity and flow
December 17 02:17:07, 2020
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