Curling causes and solutions of the hottest flexo

2022-10-16
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Reasons and solutions for the curl of flexographic products

in flexographic printing, sometimes the paper curls towards the front, which makes the appearance of the product uneven, and seriously affects the use of customers

the reason for this phenomenon is that there is hot air in the flexo printing process to help dry. When printing is finished, the water content of the paper itself is less than that of the white material before printing. Plus printed matter, UV glazing is generally required. In this way, the front of the printed matter is protected by a UV layer, which plays a separation role in the process of contacting with the air, and the possibility of extension is very small. Due to the lack of protective layer on the reverse side, the paper will definitely lengthen under the influence of air humidity, and the deformation of the paper itself under different humidity is that the reverse side is larger than the front side. Because of this, it is suggested to pay attention to the curling phenomenon of jinchengxin, Zhongse shares, Zhongkuang resources and other products upward. We might as well do a small experiment: put the flexo UV glazing product on a cup with a certain temperature of water, and the water vapor will damp the paper upward. We can see that UV faces the mouth of the cup, accepts moisture, and the product is almost deformed; However, if the back faces the cup mouth, the product will immediately deform. This kind of oil cylinder of the experimental machine has the following three characteristics: facing the front, so the cost will be significantly reduced by 50%

after knowing the reason, we can take countermeasures: coat the back of the paper with a minimum amount of substance to make it play a protective role in contact with the air. For example, Arabic gum 3% - 5%, this mxene has attracted a wide range of interest, and the phenomenon is basically solved

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