Fiber is the most basic substance that constitutes general paper, and this fiber must be a vegetable fiber. Some sheets made of animal fibers such as wool and silk, although they have all kinds of paper functions and characteristics, can not be called "paper"; the paper made of chemical polymer fibers can only be called synthetic paper. .
Another element of papermaking is fiber beating and knocking. Using stir knives and high horsepower machinery, the plant fibers are bifurcated and crushed, and then they are made into paper, which has a large binding force, unlike smooth silk fibers that are easy to slip off; in addition, after beating The generated debris and paste have the function of filling pores and sticking papers during paper making. In ancient or modern hand-made paper, the frame bamboo was used to screen the floating fibers in the pulp from the pulp. Because the screening action has front and rear short sides and left and right long sides, the hand-made paper fibers can be very uniform and free in various directions Arrangement, did not cause the problem of flow described in this article. Furthermore, the modern anhydrous dry papermaking method uses air to spread and glue to make paper. The fibers are also arranged in a free form, and there is no direction of silk flow.
Wet mechanical papermaking, regardless of the old-fashioned rotary screen machine, single screen machine, and double screen machine, can use about 1% thin pulp, which is distributed from the head box on the papermaking net surface. Make the fibers appear in line with the movement direction of the papermaking net. The principle is as fast as the river water flows. If there are no other disturbance factors, the driftwood is naturally arranged in the direction of the water flow, and the flow is less oblique or transverse to reduce the resistance. The fibers in the thin pulp on the paper net have a unidirectional effect on the flow rate due to the progress of the screen before the water is lost. Most of the fibers are arranged in parallel flow directions, which forms the reason for the future "paper flow" arrangement of mechanical papermaking.
The grain flow of the paper has a great influence on the various "sex" and "shape" of the paper, such as tear resistance, curling, elongation, shrinkage and processing origami, book stiffness and openness, etc. It has an absolute influence, like the silk flow of the label paper must be parallel to the height of the birth, so that the automatic packaging machine can operate smoothly. However, the importance of paper silk flow is rarely appreciated, and it is not a good thing in printing engineering plans.
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