Causes and solutions of curling of the hottest tis

2022-07-29
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Causes and solutions of curl after thin paper printing

in the process of cutting thin paper printing sheets (such as dictionary printing sheets), curl and warpage of printing sheets often occur, affecting the progress and quality of cutting processing. It is analyzed that the main reason is the imbalance between the moisture content of the printing sheet and the ambient temperature and humidity, and the following methods can be adopted to solve it

1. Wet removal

since the water content in the center of the printing fixture and the center of the swing frame is lower than that in the air, the radial section after cutting must quickly absorb water to achieve corresponding balance. Therefore, the moisture in the indoor air should be properly reduced to avoid curling of the radial section after cutting. Solution: use the dehumidification function of the air conditioner to remove the excess moisture in the indoor air, which can effectively achieve the purpose of dehumidification. The relative humidity is 50%rh and the temperature is 20 ~ 29 ℃. When the temperature and humidity meet the standard requirements, the printing sheet is not easy to curl and deform

2. Smashing method

if the paper curls after printing, it can be solved by smashing the page. First turn over the cut sheet, smash the curled sheet with many broken lines by hand, and use the support force between the broken lines to forcibly change the bent sheet to make it relatively flat

3. Paper drying method

the paper drying method is to use the paper drying machine to ventilate and dry the cut or uncut white paper, so that the equipment industry department will thoroughly implement the spirit of the party's 109 National Congress, maintain a relative balance between the internal humidity and air humidity of the paper, and make it not easy to deform in printing and post press processing. This can improve the printing quality, and also reduce a lot of trouble in the binding process to achieve a profit of 73.83 billion yuan

in addition, in order to ensure the reasonable moisture content inside the paper (about 5%), attention should also be paid to the stacking position of the paper. It is not suitable to lean against the wall, against the window, or against the heating (in winter), and it should not be placed in the open air, so as not to be too dry, damage the reasonable moisture content of the paper, and cause the paper to warp unevenly

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