y of the air is greater than 30%, as the humidity increases, the tensile strength a4 paper is reduced. 2. Folding. The so-called folding refers to the number of times a certain tension, the paper is folded back and forth until the time of rupture. 3. Tear. The so-called tear refers to the desired pre-notched specimens tear to force a certain length to millinewtons representation. 4. Bursting. The so-called bursting, a4 paper refers to the maximum pressure on the unit area can withstand even increased, as a result previously used kg / cm 2, said places par with international standards or kPa representation. The main factors affecting the a4 paper bursting is the binding force between the fibers, followed by the average fiber length and strength. When the relative humidity of the air in the range of 50% to 70%, the bursting of the paper reaches the maximum. (B) moisture wicking properties and absorption properties and a4 paper a4 paper in. a4 paper in full of all shapes and different lengths of curved capillary. a4 paper under the contractile force of the capillary action, has the ability to absorb water, an aqueous surfactant solution, mineral oil, organic solvents and the like. This capability allows a4 paper can withstand a variety of writing materials, and thus become an excellent carrier archives. (C) a4 paper rigidity and flexibility. Rigid refers paper resistance to bending forces applied to the, or said flexing resistance. a4 paper and fiber stiffness gives a4 paper brittle, so a4 paper without folding. A4 paper in order to improve the brittleness and increase the flexibility of a4 paper, a4 paper must make plastics processing. I.e. plasticizers glycerol, mannitol, etc. in a4 paper, whereas the cheapest plasticized a4 paper is to raise the moisture content of. (Four) a4 paper whiteness. whiteness a4 paper refers to the ability to post-a4 paper illuminated by light reflected from a comprehensive, but also a4 paper brightness level. In most cases, a4 paper caused by the action of light and heat of white decreased, while the intensity decre


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