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Method for preparing pulp board by using reed as raw material

A technology for pulp board and raw materials, applied in pulp bleaching, fiber raw material processing, pulping with inorganic alkali, etc., can solve the problems of shortage of high-grade paper products, dependence on imports, large market gap, etc. Cooking hardness, effect of optimizing bleaching process conditions

Inactive Publication Date: 2010-01-27
XINJIANG BOHU REED IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The low-quality fibers obtained by the existing straw pulp production process are difficult to meet the strength, durability and brightness requirements of the final market products; the pulp bleaching process generally uses chlorine gas, alkali treatment, hypochlorite or twice hypochlorite or A hypochlorite bleaching process, bleaching the whiteness of grass bleaching pulp to about 76%
Due to the unreasonable structure of industrial raw materials, the quality of domestic paper and cardboard is mostly low-end products, and there is a serious shortage of high-end paper products. Most of them rely on imports, and the market gap is large.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After the reeds in Bosten Lake are harvested and landed in winter, they are manually punched into reed bales with a length of 80cm and a weight of 80kg. According to the total weight of reed pulp, 12% sodium hydroxide, 0.02% green oxygen, 0.1% sodium sulfite, steam, and water are cooked together at a temperature of 180°C, and the unbleached pulp hardness of reed pulp (potassium permanganate value ) is 10, and then the unbleached reed pulp is extracted with a pulp washing machine to extract the cooking waste liquid - black liquor, and the undigested thick fiber bundles are extracted with a pressure screen, and then enter the bleaching section, and the CE bleaching is carried out by using hydrogen peroxide to strengthen the alkali treatment. P H bleaching process, the C section is 6% of chlorine used in the chlorination section, the slurry concentration is 4.5%, and the reaction is at room temperature; E P The hydrogen peroxide-intensified alkali treatment section, in whi...

Embodiment 2

[0027] After the reeds in Bosten Lake are harvested and landed in winter, they are artificially punched into reed bales with a length of 80 cm and a weight of 60 kg. The reed bales are prepared by wet method and cut into 2.5 cm long reed pieces. According to the total weight of reed pulp, 20% sodium hydroxide, 0.1% green oxygen, 3% sodium sulfite, steam, and water are cooked together at a temperature of 150°C, and the unbleached pulp hardness of reed pulp (potassium permanganate value ) 15, and then the unbleached reed pulp is extracted with a washing machine to extract the cooking waste liquid - black liquor, and the undistilled thick fiber bundles are extracted with a pressure sieve, and then enter the bleaching section. P H bleaching process, C section is 3% chlorine consumption in the chlorination section, the slurry concentration is 2%, and the reaction is at room temperature; E PThe hydrogen peroxide-intensified alkali treatment section, in which NaOH accounts for 2%, th...

Embodiment 3

[0029] After the reeds in Bosten Lake are harvested and landed in winter, they are artificially punched into reed bales with a length of 80cm and a weight of 70kg. The reed bales are prepared by dry and wet methods, cut into 4cm-long reed pieces, and then placed in a continuous digester and a steaming ball. Reed slices and 23% sodium hydroxide, 0.2% green oxygen, 5% sodium sulfite, steam and water are cooked together at a temperature of 160°C based on the total weight of reed pulp, and the unbleached pulp hardness of reed pulp (high manganese acid potassium value) 12, and then the unbleached reed pulp is extracted with a washing machine to extract the cooking waste liquid - black liquor, and the undistilled coarse fiber bundles are extracted with a pressure sieve, and then enter the bleaching section. CE P H bleaching process, the C section is the chlorination section with 5% chlorine, the slurry concentration is 3%, and the reaction is at room temperature; E P The hydrogen p...

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PUM

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Abstract

The invention relates to a method for preparing a pulp board by using reed as a raw material, which comprises processes of preparing materials, boiling, washing and selecting, bleaching and pulping in turn. The method is characterized in that the boiling means that reed chips, sodium hydroxide, green oxygen, sodium sulfite, vapor and water are subjected to delignification reaction together at the temperature of between 150 and 180 DEG C; and the bleaching adopts a CEPH, OQPQP, CEPHAP, CEHAP or CEHP bleaching process. Taking the read as the pulping raw material, the method can reduce the boiling hardness and improve the strength and whiteness of the pulp board by controlling boiling conditions, closing washing and selecting conditions and optimizing bleaching process conditions.

Description

technical field [0001] The invention relates to a method for preparing pulp boards for papermaking, in particular to a method for preparing pulp boards with reeds as raw materials. Background technique [0002] The paper industry is an industry that is closely related to the development of the national economy and the construction of social civilization. The growth rate of paper consumption is basically in sync with the growth rate of GDP. In the past 10 years, my country's demand for paper has an average annual growth rate of 8.77%. [0003] my country is a country with scarce forest resources, and wood pulp and papermaking raw materials are scarce. The annual domestic wood pulp is less than 10% of the domestic demand. Most of the production raw materials need to import wood pulp and waste paper to make up for the raw material gap. Recently, rising international energy and wood prices have increased the cost of papermaking, and pulp prices in the international market have...

Claims

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Application Information

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IPC IPC(8): D21C3/02D21C7/00D21C9/12
Inventor 徐林刘玉栋李洪菊
Owner XINJIANG BOHU REED IND