The surface of the double loop wire is attached to a layer of galvanized layer. If the coating is too thick, it can not reach the environmental standard of SGS; but if it is too thin, it will easily oxidize with water molecules and cause rust. Therefore, the external environment has a certain impact on the preservation of double coils.
With regard to the storage environment of the double loop, please be sure that only a few high humidity (over 70%) and high temperature (above 30 degrees centigrade) will occur in the galvanized iron knot corrosion. In addition, in the rainy season, it is necessary to pay attention to the air humidity in the workshop, warehouse and printing departments. It is suggested that the moisture measuring device be used to measure the paper value of 8-10. Usually, the hygroscopic degree of the book paper is larger than that of the powder paper, and the pH value is also higher and more attention should be paid to the appearance of the rust phenomenon in the inner wire of the binding book.
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