legal a4 paper size

ny years of business experience, whether users or dealers, when purchased direct examination paper a4 paper first appearance is still very necessary, which avoids losses can also be reduced since Jin, a4 paper becoming Archives the main carrier material. The so-called a4 paper's durability, resistance to damage a4 paper refers to the outside world and maintain their physical and chemical factors, physical and chemical properties of the original capacity. Factors that determine the durability Archives a4 paper has three main: ① quality papermaking plant fiber raw materials; physical and chemical properties of each component ②a4 paper; ③ pulp and papermaking process. The length of the life of the file in addition to a4 paper with its own permanence, the impact of environmental conditions to protect the file generated by the merits is very significant. Effects of various life a4 paper archives internal and external factors, to determine the conditions of control methods to protect files and archives of the impact of unfavorable factors, in order to extend the life of the file, and is one of the tasks file protection technology. First, the file a4 paper performance (a) a4 paper's mechanical strength. The mechanical strength of the basic and important performance of most paper grades. a4 paper's mechanical strength, is usually used to make the paper, and the destruction of the integrity of the structure of an irreversible change in the stress values to those indicated. Those stress values include tensile strength, folding, tearing, bursting like. The mechanical strength of any a4 paper are dependent 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 prevents breakage of the web. a4 paper fibers are bound to affect the quantity and quality of the tensile strength of the most important factors. When the relative humidity of the air is greater than 30%, as the humidity increases, the tensile strength of the a4 paper is reduced. 2. Folding. The so-called folding refers to the number of times a certain tension, fold the paper back and forth until the time of rupture. 3. Tear. The so-called tear refers to the required pre-notched specimen tear to force a certain length to millinewtons expressed. 4. Bursting. The so-called bursting, a4 paper refers to the maximum pressure in the unit area can withstand even increased, as a result previously used kg / cm 2, said international standards Pa or kPa places represented. The main factors affecting the a4 paper bursting is the binding force between the fibers, followed by the average length and strength of the fiber. When the relative humidity of the air in the range of 50% to 70%, the resistance to breaking of the paper reaches the maximum value. (B) moisture wicking properties and absorption properties and a4 paper a4 paper's. a4 paper were filled with shapes, different leng



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