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Influence of abnormal water content of paper on Printing

      Technical practice shows that there are many reasons affecting the printing quality, among which the abnormal water content of paper is also the reason affecting the product printing quality. Correctly understanding the relationship between paper water content and printing, correctly controlling paper water content and ensuring the quality of packaging printing play an important role.Influence Of Abnormal Water Content Of Paper On Printing

 

Influence Of Abnormal Water Content Of Paper On Printing

      As we all know, paper is composed of fibers, fillers and rubber materials. When the environmental temperature and humidity change makes the water content of paper too much, the binding force of fibers, fillers and rubber materials in paper is easy to decline, which will inevitably affect the surface strength of paper.Influence Of Abnormal Water Content Of Paper On Printing

       In this way, it is easier to produce poor conditions of powder removal and paper dust in the printing process, so as to reduce the hardness and stiffness of the paper edge.Influence Of Abnormal Water Content Of Paper On Printing

      During paper feeding, it is easy to produce unstable pre gauge positioning and lead to overprint misalignment. On the contrary, the paper with low water content has poor elasticity, large printing website and printing expansion rate. The paper is prone to moisture absorption variation and incorrect printing in the printing process.Influence of abnormal water content of paper on Printing.Influence Of Abnormal Water Content Of Paper On Printing

      If the water content of paper is uneven, there will also be various printing disadvantages. If the water content around the paper is about 1.4% higher than that in the middle, the overprint gauge line at the rear trailing tip of the paper will be 1mm longer than its mouth;Influence Of Abnormal Water Content Of Paper On Printing

      If the water content is higher than 2.5%, the back trailing tip of the paper will produce printing wrinkles, and the overprint gauge line of the back trailing tip will be 2mm longer than its mouth, and the corresponding overprint inaccuracy will also occur in the pictures and texts in the printing sheet;Influence Of Abnormal Water Content Of Paper On Printing.

      If the water content is higher than 3%, the paper will have Ruffle edge, which will cause serious wrinkles during printing; If the water content of the paper is high and the relative humidity of the printing site is low, the four sides of the paper are easy to release water, so that the water content in the center of the paper is more than 2.5% higher than that in the four sides, the paper will have a tight edge shape, and it is easy to duplicate the pictures and texts in the middle during printing.Influence Of Abnormal Water Content Of Paper On Printing.

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