eral, to determine the appearance of the disease is mainly paper to print or use the factors to consider, and if there is a slight illness paper, but has little effect on the print or use, as long as both sides look at the situation, a4 paper can still be used. But if the paper obviously sick, but a greater impact on the printing and use of such a4 paper or a good return. So in my many years of business experience, either user or reseller when purchasing paper a4 paper first appearance on direct examination is still very necessary, which avoids losses can also be reduced since the Jin Dynasty, a4 paper gradually become archives main body of the carrier material. A4 paper called durability, resistance to damage a4 paper refers to the external physical and chemical factors and maintain their physical and chemical properties of the original capacity. Factors that determine the durability archives a4 paper has three main: ① quality paper plant fiber materials; physical and chemical properties of each component ②a4 paper; ③ pulp and papermaking process. A4 paper archives length life except with their durability related, environmental conditions affecting the merits of file generated is also very significant. Effects of a4 paper archives of various internal and external life, in order to determine the condition prevention methods to protect files and archives of the impact of unfavorable factors, to extend the life of files, one of the tasks is to file protection technology. First, the performance of a4 paper archives (a) a4 paper's mechanical strength. Mechanical strength is one of basic and important property of most paper grades. mechanical strength a4 paper is usually used to make paper and structural integrity destroyed irreversibly change the stress value of those represented. Those values include stress tensile strength, folding, tearing, bursting like. A4 paper of any mechanical strength depends on the bonding strength of the original strength and fiber a4 paper fibers between. 1. Tensile strength. The so-called tensile strength refers to the paper at a specific load, certain length, maximum tension fracture pattern width can bear with (kN / m), respectively. High tensile strength of the web can be prevented from breakage. a4 paper fibers are bound to influence the quantity and quality of the tensile strength of the most important factors. When the relative humidit


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