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Method capable of stabilizing paper stuff whiteness

A pulp and whiteness technology, which is applied in the process of adding pulp raw materials, paper, papermaking, etc., can solve the problems of increasing the amount of whitening agent added, the appearance quality, the darkening of the pulp color, and the inability to achieve it, so as to achieve bright color and bright color Bright, usage-reducing effect

Inactive Publication Date: 2008-05-21
MCC PAPER YINHE
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Problems solved by technology

[0003] The original method does not add any chemicals before beating, and the color of the slurry becomes dark and red due to the influence of metal ions, which increases the amount of whitening agent added in the subsequent process and the appearance quality of the paper. If you want to make the whiteness of the paper The degree can reach more than 80°SR, which cannot be achieved by this process

Method used

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Embodiment Construction

[0014] The method for stabilizing pulp brightness comprises the following steps:

[0015] 1) First add 18Kg of emulsion-like diethylenetriaminepentaacetic acid (ie: DTPA) to 2.0m 3 In the reaction tank;

[0016] 2) Then add 1.gm to the reaction tank 3 clear water, stirring to obtain a concentration of 1% diethylenetriaminepentaacetic acid solution;

[0017] 3) After stirring for 30 minutes, input the diethylenetriaminepentaacetic acid solution into the finished product tank;

[0018] 4) Add the diethylenetriaminepentaacetic acid solution in the finished product tank to the APMP pulp beating tank, white water tank and pulp mixing tank respectively; the addition amount is: 350L per ton of pulp in the APMP (alkaline peroxide mechanical pulp) beating tank ; Add 200L per ton of pulp in the white water tank, and add 100L per ton of pulp in the pulp mixing tank.

[0019] The present invention is not limited to the above-described embodiments.

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Abstract

A method for stabilizing the whiteness of pulp belongs to the technical field of pulping and papermaking, by adding diethylenetriaminepentaacetic acid (DTPA) to the pre-knock tank, white water tank, and pulp mixing tank of alkaline hydrogen peroxide mechanical pulp respectively, so as to cover the The existing metal ions can achieve the purpose of stabilizing the color of alkaline hydrogen peroxide mechanical pulp (APMP pulp), improve the whitening efficiency of the subsequent added whitening agent; maintain the original color and brightness of the pulp, and can also reduce the subsequent process With the addition of whitening agent, the whiteness of the finished paper reaches above 80°SR, which improves the whitening efficiency of the whitening agent added in the subsequent process, reduces the amount of whitening agent used, and makes the finished paper bright and bright in color and delicate in hand. , can meet the requirements of printing, improve the grade of paper; also improve production efficiency, reduce production costs, and save energy.

Description

technical field [0001] The invention relates to pulping and papermaking technology, in particular to a method for stabilizing the whiteness of pulp for papermaking, especially APMP pulp. Background technique [0002] APMP pulp is currently a commonly used raw material for papermaking. Before papermaking, APMP pulp needs to be beaten by a refiner. Since the grinding stone of the refiner used is a metal material, no chemicals are added to the pulp before beating, resulting in APMP pulp. After beating by the refiner, the whiteness of the pulp decreases by 4-5 degrees due to the influence of metal ions. The color of APMP pulp changes greatly before and after beating. After beating, the pulp loses the soft light yellow of the original pulp, and becomes dull and dull. It is slightly red, and the color of the finished paper is dark red and the whiteness is reduced by 5-10 degrees. In order to maintain the whiteness of the paper, the amount of whitening agent in the subsequent proce...

Claims

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Application Information

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IPC IPC(8): D21H23/16D21H17/14
Inventor 王秋云刘运福张义华李树俭李帅
Owner MCC PAPER YINHE
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