Abstract
Paper is a felted sheet formed on a wire from a water suspension of fibers and is composed of a network structure created by the hydrogen bond of fibers. The air volume in the network of paper reaches to about 50 % of its total volume. The paper making process including pulping, stock preparation, forming, pressing and drying strongly affect not only the characteristics of the individual fiber but also that of the network structure of the paper. These characteristics, added history-dependent nature of stress and moisture change, produce the properties of paper that the user desires, for instance, hygroexpansivity, curl, printability and runnability.
