Causes and solutions of curling after printing of

2022-08-11
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Causes and solutions of curling after thin paper printing

in the process of cutting thin paper printing sheets (such as dictionary 2016 printing sheets, etc.), curling and warping of printing sheets often occur, which affects 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

because the water content in the inside of the printing sheet is lower than that in the air, the radial section after cutting should quickly absorb water, so as to achieve the balance that should be described in detail in the following we (6) 00D model. Therefore, the moisture in the indoor air should be appropriately reduced to avoid curling of the radial section after cutting. Solution: using the dehumidification function of the air conditioner to remove excess moisture in the indoor air can effectively achieve the purpose of dehumidification. The relative humidity is 50%rh, and the temperature is 20 ~ 29 ℃. The temperature and humidity meet the standard requirements, so the jaw should be cleaned frequently, and the printing is not easy to curl and deform

2. Smashing method

if the paper curls after printing, it can be solved by smashing method. 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

paper drying method is to use the paper drying machine to ventilate and dry the cut or uncut white paper, so that the internal humidity and air humidity of the paper are relatively balanced, and it is not easy to deform in printing and post press processing, which can improve the printing quality and reduce a lot of trouble in the binding process

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, against the heating (in winter), and it is not allowed to put it in the open air, so as to avoid being too dry, destroying the reasonable moisture content of the paper, and causing the uneven warpage of the paper

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