Paper wire flow solution
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"Fiber" is the most basic material that constitutes general paper. At the same time, this fiber must be plant fiber. If the animal fiber made of wool, silk or other fabrics has various paper functions and characteristics, it is not called " Paper, which is made of chemical polymer fibers, is usually referred to as "synthetic paper."
Another requirement for papermaking is fiber pulverization. It is necessary to use a stirring knife and a large horsepower to make the plant fiber split and break. It has a large bonding force when it is made into paper, unlike the smooth fiber. . In addition, the crumbs and pastes produced after beating have the function of filling pores and bonding paper during papermaking. However, when the degree of pulping is too excessive, the paper itself is broken due to fiber breakage and will affect the paper tension. strength.
In ancient times or in modern "hand-made paper", the frame bamboo curtain was used to sift the floating fiber in the pulp in the pulp. Since the screening action has the front and rear short sides and the left and right long sides, the finished hand paper fiber arrangement will be presented. The uniform orientation of the various directions is free and does not create the problem of filament flow as discussed in this article. In addition, the modern "dry dry paper making method" uses air to spread and glue the paper to make the fibers freely arranged and has no filament flow direction.
"Wet mechanical papermaking" Regardless of the old round wire machine, single net machine, double net machine, very thin 1% pulp is flowed from the head box to the paper surface, and the horizontal or oblique lifting motion of the dip net will make The fiber appears in the direction of the moving direction of the paper-making net. The principle is as fast as the river water flows. If there is no other disturbing factor, the drifting wood is naturally arranged in the direction of the water flow, and it is less oblique or lateral flow to reduce the resistance, so on the paper-making network. The fibers in the thin pulp have a one-way flow velocity due to the advancement of the dip net before the water is lost. Most of the fibers are arranged in an equal flow direction, thus forming a reason for the "wire flow" arrangement of the mechanical papermaking.
The flow of paper has a great influence on the various "sex" and "shape" of the paper, such as tear resistance, curl, elongation, shrinkage and processing of origami, book stiffness and openness, etc. The label paper stream should be parallel to the height of the can to make the automatic packaging machine work smoothly. The importance of paper flow is rarely valued, and it is not a good thing in printing engineering planning.