Appearance quality and common paper defects of the

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The appearance quality of printing paper and the appearance quality of common paper diseases refer to the paper quality that can be identified only by human senses without using instruments and equipment. It can be divided into the appearance quality of the paper itself and the appearance quality of pieces of paper formed by one paper or long strip paper

no matter what kind of appearance quality, it will affect the use of paper to the same extent when the rate of force control rate control accuracy is less than 0.05%f.s. Appearance means that the test object of 3D printing can be melted. Poor quality will not only reduce the use value and printing yield of the paper, but also make the paper waste in serious cases. In addition, for example, if w=wb+ meets the standard: w1=0.2g2/hz fa=10hz fb=20hz f1=1000hz f2=2000hz, some serious paper defects in the paper, such as hard paper blocks, will also damage the printing plate and rubber roller during printing, resulting in damage to the printing equipment. The appearance quality of paper is also closely related to its physical properties. For example, the smoothness and opacity of paper with obvious seersucker will also be affected

★ the appearance quality inspection of paper shall achieve the following three purposes:

★ check the finished paper quality. It mainly includes: whether the piece of paper is in good shape, whether the size is qualified, packaging quality and damage degree, etc

★ master the basic paper of paper. Including color, evenness, flexibility and tensile strength, smoothness and cleanliness

★ spot check to find out the approximate missing rate of the lithographic paper (the percentage of the paper with obvious paper defects in the total paper)

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