Humidity in the workshop of Jinan handbag printing factory is an important factor affecting product quality. If the humidity of the workshop is not controlled, the printing quality will be seriously affected, or even unable to produce.
Paper is made of plant fiber, which is porous and hydrophilic, and is very sensitive to water. There is a slight change in the environmental humidity, the paper moisture content will also change. The influence of air relative humidity on the water content of paper is generally the increase of relative humidity, the increase of paper water content, on the contrary, the decrease of relative humidity, the decrease of paper water content. The water content of paper is directly related to the printing performance. For example, changes in the moisture content of the paper can cause the paper to expand (including local deformation). The dimensional stability of paper is closely related to the suitability of printing operation and registration. If it is a multi-color overprint product, the paper size changes, which will cause the product not to be overprinted, become a defective product, and waste paper. Therefore, due to the influence of humidity, the change of paper size is one of the most important problems in the printing workshop. Due to the change of water content of paper, it will also cause the change of other paper properties. For example, the moisture content, paper tensile strength and surface strength decrease; the moisture content is too low, the paper becomes brittle and hard, and electrostatic phenomenon is easy to occur during printing.
When the humidity is out of control, the substrate will generate static electricity: due to the attraction of static electricity during printing, the paper will be closed, which will make it difficult to fly to separate and feed paper, and easy to produce paper break and empty pages; the substrate surface has static electricity, which will absorb colorful paper scraps or a large number of dust and impurities floating in the air, thus affecting the transfer of ink and causing printing. The result of static electricity, on the one hand, will make the paper difficult to print, on the other hand, it will also cause printing failure, more serious will cause fire due to discharge.
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