The smoothness of paper refers to the flatness, uniformity and smoothness of the paper surface, which is mainly determined by the manufacturing process and the nature of the raw materials, and has a direct impact on the printing quality. It is an important printing performance of paper, and printing smoothness is the primary condition for obtaining prints faithful to originals on paper.
For paper with high smoothness, a small printing pressure will make the printing plate and the paper surface come into close contact with each other. In this way, the layout image on the printed matter can be faithfully reproduced, and the printed matter with the clear writing, the darker and more uniform image can be obtained, and the ink consumption can also be saved.
The paper with low smoothness has uneven surface during printing, and the contact between the surface of the paper and the printing plate is not uniform during the printing. Therefore, the pressure generated in various places is not uniform, and the amount of ink transferred is affected, which is reflected in the printed sheets. Inconsistent ink film thickness, and small dots on the printing plate cause copy failure due to sagging of the paper, that is, the brightness level of the image is lost. If it is the solid part of the image, the uniformity of the ink color decreases, and the expected print density is not reached. It can be observed that the imprint on the printed sheet is imaginary, and the ink is not uniform, which affects the image reproduction effect.
In addition, the smoothness of the paper also affects the glossiness of the printed product. The high print smoothness is conducive to the formation of a uniform and smooth ink film on the paper surface, thereby improving the glossiness of the printed material, and the printed material has a bright and beautiful appearance. Therefore, only the very smooth and smooth paper can completely reflect the level of the tonality of the manuscript and the shape of the dot, making the reproduction ideal and distinct.
To ensure the smoothness of the paper, the method of filling and calendering is mainly adopted. In this way, the tightness of the paper is increased, the elasticity and ink absorption are relatively decreased, and back-scratching is likely to occur. In addition, when the printing pressure is too large, it is easy to spread the ink layer and enlarge the deformation of the imprint, resulting in the disadvantage of the imprint. Based on these circumstances, when printing paper with poor smoothness, a clear print should be obtained by appropriately increasing the printing pressure and ink amount according to the actual situation, thereby improving the printing quality.
For paper with high smoothness, a small printing pressure will make the printing plate and the paper surface come into close contact with each other. In this way, the layout image on the printed matter can be faithfully reproduced, and the printed matter with the clear writing, the darker and more uniform image can be obtained, and the ink consumption can also be saved.
The paper with low smoothness has uneven surface during printing, and the contact between the surface of the paper and the printing plate is not uniform during the printing. Therefore, the pressure generated in various places is not uniform, and the amount of ink transferred is affected, which is reflected in the printed sheets. Inconsistent ink film thickness, and small dots on the printing plate cause copy failure due to sagging of the paper, that is, the brightness level of the image is lost. If it is the solid part of the image, the uniformity of the ink color decreases, and the expected print density is not reached. It can be observed that the imprint on the printed sheet is imaginary, and the ink is not uniform, which affects the image reproduction effect.
In addition, the smoothness of the paper also affects the glossiness of the printed product. The high print smoothness is conducive to the formation of a uniform and smooth ink film on the paper surface, thereby improving the glossiness of the printed material, and the printed material has a bright and beautiful appearance. Therefore, only the very smooth and smooth paper can completely reflect the level of the tonality of the manuscript and the shape of the dot, making the reproduction ideal and distinct.
To ensure the smoothness of the paper, the method of filling and calendering is mainly adopted. In this way, the tightness of the paper is increased, the elasticity and ink absorption are relatively decreased, and back-scratching is likely to occur. In addition, when the printing pressure is too large, it is easy to spread the ink layer and enlarge the deformation of the imprint, resulting in the disadvantage of the imprint. Based on these circumstances, when printing paper with poor smoothness, a clear print should be obtained by appropriately increasing the printing pressure and ink amount according to the actual situation, thereby improving the printing quality.
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