In the process of cutting thin paper printed sheets (such as dictionary printed sheets, etc.), often the printed sheets are curled and warped, which affects the progress and quality of the cutting process. The analysis is mainly caused by the imbalance between the moisture content of the printed sheet and the ambient temperature and humidity, which can be solved by the following methods.
1. Dehumidification
Because the water content inside the printed sheet is lower than that in the air, the radial section after cutting should quickly absorb moisture to achieve the corresponding balance. Therefore, the moisture in the indoor air should be properly reduced to avoid curling of the cut radial section. Solution: Use the dehumidification function of the air conditioner to remove the excess water in the indoor air, you can effectively achieve the purpose of dehumidification. The relative humidity is 50% RH, the temperature is 20 ~ 29 ℃, the temperature and humidity meet the standard requirements, and the printed sheet is not easy to curl and deform.
2. Page smashing method
If the paper curls after printing, it can be solved by smashing the page. Turn over the cut printed sheet first, and use the method of manual "paper smashing" to smash the curled printed sheet into many fold lines, and use the support force generated between the fold line and the fold line to forcibly change the curved printed sheet to make it relatively flat.
3. Paper drying method
The paper drying method is to use a paper dryer to ventilate the white paper that has been cut or not cut, to keep the internal humidity and air humidity of the paper relatively balanced, and to prevent it from being deformed during printing and post-press processing, which can improve the printing quality. , Also reduced a lot of trouble for the binding process.
In addition, in order to ensure reasonable moisture inside the paper (about 5%), we should also pay attention to the stacking position of the paper. , Causing unequal warpage of paper.
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