The whole process of printing and papermaking

"Fiber" is the most basic material that constitutes ordinary paper. At the same time, this fiber must be a vegetable fiber. If animal fibers such as wool and silk are made into thin sheets, they will not be called "in spite of their various paper functions and characteristics." "Paper", while paper made using chemical polymer fibers, is often referred to simply as "synthetic paper."

Another important requirement for papermaking is pulping and pulping of fibers. It is necessary to use a scalpel and a mechanical force of a very high horsepower to break up the plant fibers. When the paper is made into paper, it has a large binding force. Unlike smooth silk fibers, it is easy to slip off. . In addition, after pulping, chips and pastes are generated. In papermaking, there is a function of filling pores and binding paper. However, when the degree of pulping is too far, the paper itself is too severe due to fiber breakage and breakage, and it also affects the paper pull force. strength.

In ancient or modern “hand-made paper”, the use of frame bamboo screens to filter the pulp floating pulp fiber, because the screening action has short front and rear and left and right long side screen, so the finished handsheet fiber arrangement will be presented The uniform arrangement of all directions is free and does not create the silk flow problem discussed in this paper. In addition, the modern “waterless dry papermaking method” uses air to disperse and make paper in gluing, the fibers are arranged in a free form, and there is no wire flow direction.

"Wet mechanical papermaking" is not limited to the old rotary screen machines, single screen machines, and double screen machines. After a very thin 1% or so pulp flows from the head box to the paper surface, the horizontal or ramp-up movement of the dip net will make The fibers appear straight along the direction of the papermaking web. The principle is as fast as the river flows. If there are no other disturbing factors, the driftwood naturally follows the direction of the water flow, and there is less diagonal or lateral flow to reduce the resistance, so it is on the papermaking network. The fibers in the thin pulp have a one-way flow velocity due to the advancement of the net before the water is lost. Most of the fibers are arranged in an equal flow direction, thus forming the reason why the mechanical papermaking has a "silk-flow" arrangement.

The paper stream has a great influence on the various "character" and "shape" of the paper. For example, tear resistance, curl, elongation, shrinkage, and processing origami, book stiffness and turnability are all absolutely affected. Like the paper stream of the label and the height of the can body can make the automatic packaging machine work smoothly. The importance of paper stream is rarely valued, and it is not a good thing for a print project.