In the process of paper sales, paper quality accidents often occur. If the paper has not been cut and printed, it is not difficult to deal with. The worst result is to return the paper to the sales company, and everyone pays half of the freight or one party. The returned paper dealer can negotiate with the paper mill, claim a claim, or simply sell it at a discount. Nowadays, most users are more concerned about the price. There are some minor problems but the price is much cheaper. Many people are willing to buy it. Of course, they do n’t worry about selling foreign products. However, once it has been printed, the trouble is greater. At present, the profit of making paper is meager. One ton of paper is a profit of several hundred yuan. The printing factory often prints four or five tons of paper. If something goes wrong, no one will easily bear this responsibility in the face of losses of tens of thousands of yuan. This also results. Therefore, when both parties buy and sell paper, they must have considerable judgment, judge from the appearance, and make sure the feed is good. Especially for those business units that do not have printing machines themselves and buy papers and send them to other printing factories for printing. Since they cannot control the printing situation at any time, they must conduct a careful visual inspection of the purchased paper. Different papers have very different performances and uses, and different requirements on appearance. Moreover, the papermaking conditions of different paper machines and the ratio of raw materials are also different. Therefore, the inspection of the appearance of the paper is based on the actual paper and the standard negotiated by the two parties, and the paper that does not meet the requirements is detected. This is called paper with a paper defect. Types of appearance paper diseases: appearance paper diseases are mainly named after the shape characteristics of the difference between the appearance surface of the paper and the paper pattern, and are also named after the common papermaking defects of the paper. More common paper diseases are: air knife streak, calender streak, coating roller streak, cardboard warpage, burrs, pits, spots, embossing, folds, scraper streak, etc. Examination methods for appearance paper defects: Except for very few instruments, the appearance paper diseases are generally identified by the senses. The inspection methods are mainly the following: Oncoming light inspection method: look at the cardboard against the light source and observe the paper surface with naked eyes for defects; Horizontal inspection method: place the paper on a flat or inclined surface, the light is irradiated from above, the eyes are about 30cm away from the surface of the paper, and the eyes are being inspected against the paper surface; Manual inspection method: For paper diseases that are not easy to be detected by the naked eye, such as fine sand on the surface of the paper, the surface of the cardboard should be inspected by hand, and the flatness of the cardboard can also determine the severity of the paper disease; Audio inspection method: Hold the side of the paper with your hands, shake it back and forth, and listen to the sound level. This is mainly to check the "body and bones" of the paper and to judge the severity of the paper disease. In addition, you can also tear the paper, observe the core of the paper, or cut the paper to be printed, and cut out an A4 size sheet, overlap this and the same weight A4 size paper in the paper pattern, and then pinch one end , To see if the two sheets of paper are separated, if there will be obvious separation, it means that the quality of the paper and the pattern on arrival may be quite different. Generally speaking, the judgment of appearance paper disease mainly considers the printing or use factors. If there is a slight paper disease, but it has little effect on printing or use. As long as both parties understand the situation, the paper can still be used. However, if the paper problem is obvious and has a greater impact on printing and use, such paper is still good for return. Therefore, in the author's many years of business experience, whether it is a user or a dealer, it is necessary to first directly check the appearance of the paper when buying paper, which can avoid losses and reduce many unnecessary business disputes.
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Oblique inspection method: on the basis of the horizontal inspection method, use one hand to raise one side of the paper, and obliquely inspect it from different angles;
Talking about the types and inspection methods of paper appearance