Many people do not understand the printing quality problem. It is wrong to blame the printing equipment for the problem. The characteristics of paper are also important factors for printed materials. Jinan Printing Factory introduces the influence of paper moisture content on the quality of printed matter in detail.
For fine print, the registration requirements are high, and the allowable error is generally within 0.05mm. In multi-color printing, there are many reasons for inaccurate overprint, but the paper deformation caused by the change of water content in the printing process is an important factor.
The water content of paper refers to the percentage of the weight of water contained in the paper to the weight of the paper. When the water content of the paper is too high, the binding force between the fibers, fillers and sizing materials in the paper is easy to reduce, which will reduce the hardness and stiffness of the paper, affect the surface strength of the paper, lead to undesirable situations such as deinking and layering of the printed products, and also increase the plasticity of the paper, produce deformation, cause inaccurate overprinting, prolong the drying time of the print, and make the back of the printed products dirty,
If the water content of the paper is too low, it will lead to poor elasticity of the paper, brittle paper, reduced tearing, and easy to generate static electricity during printing. The change of paper moisture content not only leads to the expansion or contraction of the paper, but also changes the local size of the paper due to the change of water content, resulting in paper deformation, curling, wrinkling, ruffles, etc. Paper deformation is an important factor that causes overprint inaccuracy in multi-color printing.
① At a certain room temperature, the change rate of water content caused by the change of relative humidity at high humidity is much greater than that at medium humidity; This is also true at low humidity. From this point of view, printing in moderate humidity conditions is advantageous.
② The two constitute a closed hysteresis loop, which is called the hysteresis of paper humidity regulation. In order to keep the moisture content of the paper uniform on the whole paper surface, reduce the sensitivity to environmental humidity, and improve the stability of the paper size, moisture conditioning treatment is generally required before printing.
Jinan Printing Factory reminds everyone that we should choose high-quality paper when printing. Many businesses cut corners on printing paper to make profits. Such printing products greatly affect visual perception. More relevant precautions come to our website http://www.xinfengyinshua.cn Ask and understand!济南印刷厂讲解的内容 更多的内容 请咨询公司官网http://www.xinfengyinshua.cn/