The whole process of printing and papermaking

2022-09-23
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In the whole process of printing and papermaking,

fiber is the most basic material of general paper. At the same time, this kind of fiber must be plant fiber. If 30t is made of animal fibers such as wool and silk, although it has various paper functions and characteristics, it is not called paper, but the paper made of chemical polymer fibers is usually only called synthetic paper

another important element of papermaking is fiber beating and tapping, which requires a stirring knife and a high horsepower mechanical force. Everyone is very cautious about this. Plant fibers are forked and broken, and they have a large binding force when making paper, unlike bright and clean filamentous fibers, which are easy to slip. In addition, the debris and paste produced after beating can fill the pores and bond the paper when making paper. However, if the beating and knocking degree is too excessive, the paper itself will be broken too seriously due to fiber damage, which will also affect the tensile strength of the paper

in ancient or modern hand-made paper, the framework bamboo curtain is used to screen the floating fibers in the pulp. Because the screening action has front and rear short sides and left and right long sides, the finished hand-made paper fiber arrangement will show a very uniform free arrangement in various directions, which will not produce the problem of silk flow discussed in this paper. In addition, the modern anhydrous dry papermaking method uses air dispersion and gluing to make paper. Its fibers are arranged freely and have no silk flow direction

wet mechanical paper making, whether old-fashioned circular machine, single machine or double machine, is very thin. Jinan new era Gold Testing Instrument Co., Ltd. has a long-term guarantee service station in Jinan. About 1% of the pulp is spread on the paper making surface from the head box. The horizontal or inclined movement of the paper making will make the fibers appear to be in line with the direction of the paper making movement. The principle is like the rapid flow of river water. If there are no other disturbing factors, the driftwood will naturally be arranged in the direction of the water flow, There is less oblique or horizontal flow to reduce resistance, so the fibers in the thin pulp on the papermaking have a unidirectional effect of flow rate due to the advance of papermaking before the water is lost, and most of the fibers form an equal flow direction arrangement, thus forming the reason for the silk flow arrangement of mechanical papermaking

the silk flow of paper has a great impact on various properties of paper, such as tear resistance, curl, elongation, shrinkage, processing origami, book stiffness and opening suitability, etc. for example, singular and plural, past tense, compound words, roots and other absolute effects. For example, the silk flow of trademark paper should be parallel to the height of the can body to make the automatic packaging machine work smoothly. Little attention has been paid to the importance of paper silk flow, which is not a good thing in printing engineering planning

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