In the process of controlling the performance of the ink, the temperature and relative humidity of the environment have a great influence on the performance of the ink. The higher the temperature, the faster the solvent volatilizes and the faster the ink becomes viscous. However, the two extremes of relative humidity (very high humidity and very low humidity) are not the case. It is difficult for printers to control the ink performance when the relative humidity is at the two extremes, so this has always been a problem that plagues printers. Humidity over 80 ~ 85% will make the ink become sticky at a slow rate; while humidity below 15 ~ 20% will make the ink sticky at a very slow rate. But when the environment is at two extremes, simply controlling the characteristics of the ink solvent is basically powerless to improve the viscosity of the ink.
The main component of paper is plant fiber, which can absorb moisture in the air. Therefore, the moisture content of paper changes with temperature and humidity. When the moisture content of the paper changes, the paper will expand and contract, and water is needed during the lithography process. After the paper is in contact with the water, the moisture content will also be different, and the size of the paper will be difficult to maintain. Speaking, it will cause inaccurate overprint. Experiments have shown that a change of 10% relative humidity in the general air causes a change in paper moisture content of about 1%, and a change in paper size of about 0.1%. Therefore, it can only control the temperature and humidity of the printing workshop and reduce the change in paper moisture content. To control its expansion and contraction.
During the delivery, transportation, and storage of paper from the paper mill, it is also affected by climate change, which can cause deformation of the paper. If the moisture content in the air is less than the moisture content of the paper, the water at the edge of the paper will be dispersed and evaporated, and a "tight edge" phenomenon will occur; when the moisture content in the air is greater than the moisture content of the paper, the edge of the paper absorbs moisture, and the middle moisture of the paper is When the upper moisture content is large, the phenomenon of "lotus edge" occurs; when the moisture content of the front and back sides of the paper is not equal, the paper "curls". The paper is deformed, which leads to inaccurate overprinting and wrinkling of the paper during the printing process.
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