Bleached needle wood fluff pulp board and manufacturing method thereof

A technology of softwood pulp and fluff pulp, which is applied in pulp beating method, pulp bleaching, non-fiber pulp addition, etc., can solve the problem of the yield of fluff pulp, the reduction of fiber strength, the inability to guarantee the safety of fluff pulp, and the degradation of cellulose. and other problems, to achieve the effect of easy and complete separation, simple production equipment and process, and reduced fiber bonding strength

Active Publication Date: 2012-07-04
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three major defects in this process: 1. The addition of a large amount of alkali leads to serious degradation of cellulose, and the yield of fluff pulp and the strength of the fiber itself are seriously reduced
2. Because of alkali treatment, this process must carry out steps such as concentration and washing. Moreover, the amount of alkali is also large, and the cost of the process is too high
3. Fluff pulp is a liquid-absorbing product in direct contact with the human body. In its process, the pulp is not only treated with alkali, but also added with chemicals such as chelating agents, so the safety of the fluff pulp produced cannot be guaranteed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Disintegrate and disperse the bleached softwood pulp board in a low-consistency hydraulic pulper to obtain a slurry with a mass concentration of 3.7%. The disintegration temperature is 85°C. Add the bleaching bactericide of softwood pulp board quality 4% in it, and described bleaching bactericide is hydrogen peroxide; 2) slurry is sent into high-concentration deslagging device and carries out impurity removal; 3) slurry after removing impurities is sent to Enter the deflaking machine for deflaking. The deflaking steps are as follows: under the condition of 70°C, firstly decompose with 4% pulp concentration for 1min, then add hot water, maintain the defibrate temperature at 70°C, adjust the pulp concentration to 1.8%, and continue defrosting for 1min; 4) Send the decomposed slurry into the slurry mixing tank, and then add cold water to dilute to a mass concentration of 0.5%; 5) After step 4), transport the slurry from the slurry mixing tank to the slurry forming tank, ...

Embodiment 2

[0024] 1) Disintegrate and disperse the bleached softwood pulp board in a low-consistency hydraulic pulper to obtain a slurry with a mass concentration of 4.5%. The disintegration temperature is 60°C. Add 3% bleaching bactericide of coniferous wood pulp board quality, described bleaching bactericide is hydrogen peroxide; 2) slurry is sent into high-concentration deslagging device to remove impurities; 3) slurry after removing impurities is sent to Enter the deflaking machine for deflaking. The deflaking steps are as follows: under the condition of 50°C, firstly decompose with 4% pulp concentration for 2.5min, then add hot water, maintain the defibrate temperature at 50°C, adjust the pulp concentration to 1.5%, and continue defrosting for 1min; 4. ) Send the decomposed pulp into the pulp mixing tank, then add cold water to dilute to a mass concentration of 0.5%, and add 0.3% of softwood pulp board mass debonding agent and 0.3% bulking agent to the pulp mixing tank while diluting...

Embodiment 3

[0027]1) Disintegrate and disperse the bleached softwood pulp board in a low-consistency hydraulic pulper to obtain a slurry with a mass concentration of 4%. The disintegration temperature is 70°C. Add 3% bleaching bactericide of coniferous wood pulp board quality, described bleaching bactericide is hydrogen peroxide; 2) slurry is sent into high-concentration deslagging device to remove impurities; 3) slurry after removing impurities is sent to Enter the deflaking machine for deflaking. The deflaking steps are as follows: under the condition of 60 °C, firstly decompose with 3.8% slurry concentration for 2 minutes, then add hot water, maintain the decomposing temperature at 60 °C, adjust the slurry concentration to 1.5%, and continue to decompose for 0.5 min; 4 ) Send the decomposed pulp into the pulp mixing tank, then add cold water to dilute to a mass concentration of 0.5%, and add 0.2% of softwood pulp board mass debonding agent and 0.1% bulking agent to the pulp mixing tank ...

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Abstract

The invention discloses a bleached needle wood fluff pulp board and a manufacturing method thereof. The method comprises the following steps of: adding the bleached needle wood fluff pulp board into a low-concentration hydrapulper for pulping to prepare pulp, removing impurities from the pulp by using a high-concentration slag separator, making the pulp enter a defibering machine for low-concentration thermal defibering, uniformly stirring the pulp, removing the impurities, making the pulp enter a machine chest, and manufacturing the fluff pulp board by using a pulp machine. The bursting strength of the pulp board can be remarkably reduced only by mechanical and physical functions, the pulp is mainly self-curled, fiber cutting and fibrillation are avoided as much as possible, and the strength loss of the fiber is low; when quantified to be 630 to 680g/m<2>, the fluff pulp board has an burst index lower than 0.75kPa. m>2>/g and the whiteness of 85 percent; a fluffed fluff pulp fiber has the fluff-specific volume of 24cm<3>/gm, water absorbing speed higher than 3.5mm/s and water absorbing capacity higher than 8.7g/g; and the quality of the bleached needle wood fluff pulp board meets quality requirements according to GB/T21331-2008, and is equivalent to that of an imported fluff pulp board.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a bleached coniferous wood fluff pulp board and a preparation method thereof. Background technique [0002] The current manufacturing method of fluff pulp is to use broad-leaved wood, coniferous wood, bamboo or cotton linters as raw materials, and use BCTMP, CTMP or CMP pulping methods, or chemical pulping, but the fluff pulp produced has short fibers and dry fibers. Small bulk, poor water absorption, poor filling, and easy to shed hair and powder, and dust pollution. The produced fluff pulp board has too high breaking resistance and too much bonding force between layers. It is more difficult, resulting in poor fluffiness after fluffing. And along with the stripping process, the fibers are severely torn off. Due to quality problems, the use of the above-mentioned fluff pulp is greatly limited, and the pulping method of the fluff pulp does not solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/00D21B1/34D21D1/02D21C9/16D21H21/08D21H21/00D21H17/67D21H17/56
Inventor 徐永建王皎吴养育杨靖谧梁涛
Owner SHAANXI UNIV OF SCI & TECH
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