Corrugated paper production method using waste paper pulping to improve fiber utilization rate

A technology of corrugated core paper and production method, which is applied in the post-processing modification of cellulose pulp, fiber raw material, fiber raw material processing and other directions, can solve the problem of the reduction of toughness and strength of corrugated core paper, poor fiber dispersing and dispersing effect, and fiber recycling rate. Low problems, to achieve the effect of increased toughness and strength, weakened bonding force, and improved utilization

Active Publication Date: 2019-03-26
东莞顺裕纸业有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

There are mechanical methods, thermochemical methods and thermal methods for recycling fibers in waste paper. These methods have high energy consumption, high content of toxic organic halides (AOX) in the treated wastewater, poor fiber dissolving and dispersing effects, and fiber recycling efficiency. Low-level problems, thus limiting the recycling of waste paper fibers
[0003] During the pulping process, most of the fibers will be damaged, and the fiber breaking rate is also very high, which will greatly reduce the toughness and strength of the prepared corrugated medium paper, and affect the quality of the corrugated medium paper
[0004] Therefore, it is necessary to research and develop a pulping process suitable for waste paper to solve the problems of poor disintegration and dispersion of waste paper and low fiber recycling rate, so as to improve the utilization value of recycled waste paper fibers, so it is necessary to improve

Method used

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Experimental program
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Effect test

Embodiment 1

[0038]A method for producing corrugated medium paper using waste paper pulping to improve fiber utilization, comprising the following steps:

[0039] (1) Steps for making waste paper primary pulp, including the following sub-steps:

[0040] (1.1) The step of adjusting the waste paper slurry, controlling the concentration of the waste paper slurry to 15-20wt%, breaking the waste paper and putting it into the soaking tank for soaking, the soaking time is 10-12 hours, first softening the waste paper, The water-soluble substances in the waste paper are fully dissolved in water by soaking, so that the waste paper is preliminarily decomposed to obtain a waste paper slurry, and the waste paper slurry is transported to the stirring equipment through the conveying pipeline;

[0041] (1.2) Waste paper slurry soaking swelling step, the waste paper slurry is placed in the first stirring device, the internal temperature of the first stirring device is controlled at 40-50 ° C, and the sodiu...

Embodiment 2

[0064] The main structure, principle and function of this embodiment are the same as those of Embodiment 1, and will not be repeated here. The difference is that

[0065] (1.2) Waste paper slurry expansion step, transporting the swollen waste paper slurry to the first high-pressure reactor, and steam pressurizing the first high-pressure reactor, pressurizing by air pressure, the pressure is controlled at 15MPa, The pressure is stabilized for 7 minutes, the pressure is released instantly, and the pressure in the first high-pressure reactor is released within 1 second to obtain waste paper puffed pulp;

[0066] (2.1) In the step of puffing cowhide fragments, the cowhide waste fragments are placed in the second high-pressure reactor, and the steam in the second high-pressure reactor is pressurized, pressurized by air pressure, the temperature is controlled at 45 ° C, and carbon monoxide is introduced. The pressure is 22Mpa, the pressure is maintained for 2.5h, the pressure is rel...

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Abstract

The invention discloses a corrugated paper production method using waste paper pulping to improve the fiber utilization rate. The method comprises the following steps: waste paper pulp adjustment, waste paper pulp soaking and swelling, waste paper pulp puffing, waste paper pulp breaking, shredded kraft paper puffing, kraft paper pulp breaking, residue removal and screening, mixing with a grindingaid, grinding for forming a pulp, mesh papermaking pressing and subsequent papermaking. The waste paper and the shredded kraft paper are used to produce the corrugated paper, and the papermaking material is sufficiently preprocessed before the above pulp breaking step to maximally dissociate fibers in the papermaking material in the pulp breaking step and keep the integrity of the fibers, so the utilization rate of secondary fibers in the papermaking step is improved. The method has the advantages of simple process, energy-saving, environmentally-friendly, clean and pollution-free production process, great reduction of fiber damages and the broken rate of the fibers in the pulping process, and high fiber utilization rate, and the toughness and the strength of the prepared corrugated paperare greatly improved.

Description

technical field [0001] The invention relates to the technical field of corrugated medium paper production technology, in particular to a production method of corrugated medium paper which uses waste paper pulping and improves fiber utilization. Background technique [0002] With the improvement of waste paper recycling technology, the technology of using waste paper to prepare corrugated medium paper is very mature. There are mechanical methods, thermochemical methods and thermal methods for recycling fibers in waste paper. These methods have high energy consumption, high content of toxic organic halides (AOX) in the treated wastewater, poor fiber dissolving and dispersing effects, and fiber recycling efficiency. Low-level problems, thus limiting the recycling of waste paper fibers. [0003] Most of the fibers will also be damaged during the pulping process, and the fiber breaking rate is also very high, which will greatly reduce the toughness and strength of the prepared c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/34D21H11/14D21H11/18D21H17/64D21B1/32D21D5/02
CPCD21B1/32D21B1/345D21D5/02D21H11/14D21H11/18D21H17/64Y02W30/64
Inventor 刘伟锋赖耀康刘志锋
Owner 东莞顺裕纸业有限公司
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