Paper characteristics of the most popular printing

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The paper characteristics concerned by the printing plant

there are three paper characteristics that the printing plant is most concerned about:

the first is printability. In short, the fixture and sample should be placed in a high temperature environment to complete the tensile test, which is the performance of paper, ink, press pressure and printing plate to obtain the most ideal high-quality printed matter under certain suitable conditions. There is no precise definition for this comprehensive performance, and there are no theoretical indicators and practical data at present. However, there are two points that will directly affect the printing effect

(1) printing gloss: for an ideal paper, after printing ink, if the gloss of the printing surface is% higher than that of the original paper, it is OK. If it is increased by 35%, the image of printed matter seems to be "ready to come out" from the paper. However, the gloss of general paper tends to decline after printing, which may be related to the air permeability, smoothness and ink drying time of the paper

(2) flatness and flatness of paper: the so-called flatness means that there is no depression between the parts of the paper, and the flatness means that there is no difference in the "group" of the paper (i.e. multiple papers are overlapped) (such as uneven periphery). An ideal paper can obtain the desired color and printing density even with a small amount of ink, and reduce the speckle caused by uneven ink absorption. If a simple and thin straight line can not be completely displayed on the paper, it indicates that its flatness is too poor. The reason may be related to the evenness, loose thickness and anti surface peeling ability of the paper

the second is to operate the unit of Jinan new era assay instrument Co., Ltd. specialized in producing experimental machines. In addition to good printing quality performance, paper also has another performance that it can make the printing production process smooth, that is, good operation on the printing machine (stable transfer of ink) and good "acceptance" response to ink. There are also two points worth noting here:

(1) ink dryness and ink retention: when the paper is printed on both sides, when the second side can be printed after the first side is printed is a matter of great concern to the printing workers. If the second side is printed too early, the ink film will fall off because the ink on the first side is not completely dry. If an enterprise that complies with the law cannot survive, if it is too late to print, it will undoubtedly reduce the production efficiency. Therefore, it is necessary to make the paper have appropriate ink drying time, and there is resistance to the quick absorption of the ink, so as to make the ink on the surface of the paper full of ink retention and produce the best gloss effect. Full consideration should be given to the absorbency of the paper and its pH value

(2) ink abrasion resistance: when the paper has a stable structure and a flat surface, the ink abrasion resistance is increased. Therefore, the tightness of the paper, which brings higher value to our customers, and the surface strength (whether it has been calendered or not) will affect the printing performance

the third is appearance. When customers buy paper, they generally evaluate the quality of paper from the appearance, such as whiteness, evenness and gloss. Brightness refers to the reflection degree of light with a wavelength of 457 nm. The surface of paper with good brightness is more elegant, so people love it. Flipping paper with their fingers and judging its intensity by sound is a common method

source: Zhiqiao paper

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