t prods been printed, relatively big trouble. Now do the paper profits, one ton of paper that is a few hundred dollars profit, printing easily four or five tons of paper printed opened, a problem facing the loss of a few million, no one would easily assume this responsibility, a lot of disputes also resulting. Therefore, the two sides traded a4 paper at the time, must have considerable ability to judge, to judge from the appearance, the good feed this off. Especially those who are no printing presses, buy printing paper printing contract to other business units, as a result of the situation can not keep control of printing, but want to buy a4 paper, a careful visual inspection. Different a4 paper, its performance, there is a great difference between the use of the appearance of the different requirements. And a different machine, its papermaking conditions, the ratio of raw materials and there are also different, so check the appearance is based on a4 paper a4 paper actually see the two sides negotiated with the standard inspection, check out the non-compliant a4 paper, paper known to have the appearance of the disease a4 paper. The appearance of paper types disease: the appearance of the disease mainly paper a4 paper characteristic appearance of the surface shape and pattern differences to be named, but also to a4 paper papermaking defect common to be named. Paper disease more common are: air knife streak, calendering streak, streaks coating roll, cardboard warping, burrs, pits, spots, embossing, bankbook, scraper streaks like. Check the appearance of the paper's disease method: check the appearance of the paper's disease, except a very few require the use of instruments, in general, are based on sensory identification, inspection methods are mainly the following categories: Towards rays law: the cardboard look after facing the light source, with Have visually a4 paper surface defects; flat look test method: the a4 paper on a flat surface or ramp, the light from above illuminated surface of the eye from a4 paper about 30cm, eyes facing paper checks; oblique look at inspection method: in the flat look on the basis of inspection method, using both hands to raise one side of the paper, from a different angle tilted checks; hand touch test method: for the naked eye is not easy to find the paper's disease, such as fine sand a4 paper surface, etc. to touch the surface of the hand flat cardboard check, while the cardboard paper flat touch can determine the severity of the disease; listen to the sound test method: hand pinch a4 paper side, shaking back and forth, listening to the extent of its audible . This is mainly to check a4 paper "body bone" while judging the severity of the paper's disease. It also can tear a4 paper, a4 paper to observe the core, or is to be printed a4 paper, also cut out a piece of A4 size, and this pattern in the same weight of the A4 size a4 paper overlap then pinch the end, to see whether two separate sheets of paper, if there will be significant apart, indicating the arrival of a4 paper with a pattern in terms of quality may have a greater difference. In general, the disease is mainly to determine the appearance of the paper is to print or use the factors to consider, and if there is a slight paper's disease, but has little eff



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