Pre-shaping device before printing of wood-grained paper, and pre-shaping method thereof

Abstract

The invention provides a pre-shaping device before printing of wood-grained paper, and a pre-shaping method thereof. The pre-shaping device comprises a printing wallboard used for improving the moisture of the wood-grained paper, and a bellows wallboard used for drying the wood-grained paper after the moisture is improved, and a water tank used for storing the moisture is arranged at the bottom ofthe printing wallboard. An impressing steel roller used for transmitting the moisture to the wood-grained paper is arranged in the water tank, and an impressing rubber roller used for pressing the wood-grained paper on the impressing steel roller is arranged on the printing wallboard; and a plurality of bellows guide rollers used for conveying the wood-grained paper, and a drying assembly used for drying the wood-grained paper conveyed on the bellows guide rollers are arranged on the bellows wallboard. The pre-shaping method comprises the steps of adding of moisture, drying and the like. According to the pre-shaping device, the water content of the wood-grained paper is increased through the embossing steel roller, and the fiber characteristic of the paper is adjusted; the overall flexibility of the paper is improved, and the wood-grained paper with the water content increased is dried through the drying assembly; the paper feeding characteristic is stabilized, and the water content of the paper falls back; and stable drying and proportional shrinkage are provided for the paper.

Description

【Technical field】 [0001] The invention relates to a pre-printing pre-printing device and a pre-setting method for wood grain paper. 【Background technique】 [0002] The amount of water contained in the pulp is a necessary condition for the combination of plant fibers to form paper. Without the mediation of water, the fibers cannot be combined into paper. But moisture can also adversely affect paper properties. The specific performance is: [0003] 1. When the moisture in the paper increases to a certain value, serious loosening will occur even with a very strong fiber structure. It can be seen that the strength of fiber bonding decreases with the increase of moisture. In practice, the tensile strength of paper reaches the maximum when the relative humidity is balanced with a moisture content of about 30% to 35% (tear and folding resistance). degrees later), after which it will drop significantly. This is due to the fact that the strength and flexibility of individual fibe...

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Problems solved by technology

[0004] 2. Moisture also has a great influence on the brittleness and folding endurance of paper

If the moisture is too low, the rigidity of the paper will increase and become brittle. At the same time, the ability of the fibers to slip and disperse stress will be reduced, resulting in a significant reduction in the flexibility and folding resistance of the paper.

[0005] In gravure printing, the water content has a great influence on the wood grain paper. If the wood grain paper is not pretreated, the shrinkage ratio of the pattern before and after the paper joint will be different, resulting in the inaccurate appearance of the overall pattern.

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