The uniformity of the paper not only affects the various properties of the paper, but also directly affects the printing quality. The serious unevenness of the paper will cause the paper surface to wrap up and appear in the shape of "bubble yarn", which will inevitably cause quality problems caused by poor flatness in printing. The paper with poor general uniformity has uneven light transmission when looking at the light source, even in the shape of "cloud flower". This kind of paper with poor uniformity has a relatively poor surface smoothness, and the unevenness of the tightness will cause great unevenness in the acceptance and absorption of ink. Such unevenness will inevitably disturb the printed picture. Uniformity and reduce the quality of the printed matter.
In the solid part of the printed matter, sometimes slight unevenness may occur. Most of this unevenness is unevenness in concentration, but also unevenness in gloss. The main reason for this unevenness is the uneven absorption of ink by paper. This absorption characteristic is closely related to the uniformity of the paper; the paper with poor uniformity has uneven distribution of fibers and the difference in tightness is also obvious, so the amount of ink absorption and the speed of absorption will be different, so It is easy to produce unevenness of density and gloss on the printed surface.
Similarly, the base paper uniformity of the coated paper also has an impact on the quality of the printed matter. For coated paper, the part that directly absorbs ink is the coating layer, but when the uniformity of the base paper is poor, it will cause uneven penetration of the adhesive in the coating to the base paper layer. Unevenness. In addition, the unevenness of the base paper will also cause the unevenness of the coating during the coating process, especially the uniformity of the coating during the blade coating has a great correlation with the uniformity of the base paper, so the unevenness of the base paper Properties often cause unevenness in the ink absorption of the paint layer.
The other defects and defects on the surface of the paper, such as folds, dirty spots, wrinkles, dust, wet spots, etc., are self-evident on the quality of the printing quality, and will not be repeated here.
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