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Paper-making grade softwood pulp plate modifying production technique

A softwood pulp and production process technology, applied in papermaking, paper machines, pulp bleaching, etc., can solve the problems of single bleaching method, slow dissolution of hemicellulose, severe conditions, etc., achieve the purification of methylcellulose content, reduce production costs, The effect of protecting the environment

Active Publication Date: 2008-04-09
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is that the above-mentioned existing denatured wood pulp production process has uneven impregnation of wood pulp board, slow dissolution of hemicellulose, difficulty in depolymerization, uneven cooking, single cooking method, single bleaching method and conditions. severe wait deficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Embodiment 1: caustic soda method one

[0044] 1. Use 6000Kg of paper-making grade coniferous wood pulp board, and paginate through the pagination machine.

[0045] 2. Soak into a 4.5% (3-6) pulp porridge with 8% (6-12) NaOH.

[0046] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0047] 4. Put the squeezed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH, total alkali concentration of cooking liquid 100g / l (80-120), liquid ratio 1:2.5 (2.5-3.5 ); (2) The initial temperature of the cooking liquid is ≥ 40°C; (3) Preheating for 10-15 minutes to 105±5°C; (4) Dry running for 25-30 minutes after the steam is stopped; (5) Three small 4 times of steam release and heating curve, the total heating time is 2 hours; (6) The holding temperature is 140±2°C (138-160).

[0048] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing mater...

Embodiment 2

[0052] Embodiment 2: caustic soda method two

[0053] 1. Use 6000Kg of paper-making grade coniferous wood pulp board, and paginate through the pagination machine.

[0054] 2. Soak into a 3.5% (3-6) pulp porridge with 10% (6-12) NaOH.

[0055] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0056] 4. Put the pressed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH, total alkali concentration of cooking liquid 80g / l (80-120), liquid ratio 1:2.5 (2.5-3.5 ); (2) The initial temperature of the cooking liquid is ≥ 40°C; (3) Preheating for 10-15 minutes to 105±5°C; (4) Dry running for 25-30 minutes after the steam is stopped; (5) Three small 4 heating curves of steam release, the total heating time is 2 hours; (6) The holding temperature is 160±2°C (138-160).

[0057] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to e...

Embodiment 3

[0061] Embodiment 3: caustic soda method three

[0062] 1. Use 6000Kg of paper-making grade coniferous wood pulp board, and paginate through the pagination machine.

[0063] 2. Soak it into a 4.0% (3-6) pulp porridge with 12% (6-12) NaOH.

[0064] 3. Use the porridge pump to send it into the press to squeeze and loosen the dispersed fibers.

[0065] 4. Put the squeezed wood pulp into the digester for cooking. The process conditions are: (1) Cooking agent: NaOH, total alkali concentration of cooking liquid 60g / l, liquid ratio 1:2.5 (2.5-3.5); (2) The initial temperature of the cooking liquid is ≥40°C; (3) pre-heating for 10-15 minutes to 105±5°C; (4) idling for 25-30 minutes after the steam is stopped; (5) 3 times of small steam release and 4 times of heating curve, the total heating time is 2 hours; (6) The holding temperature is 170±2°C.

[0066] 5. Send the above-mentioned wood pulp slurry obtained by cooking from the dumping tank to the squeeze washing material to extrac...

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Abstract

The invention provides a denaturizing production technique of paper making needle wood pulp plate, which solves the problems of uneven dipping, slow hemicelluloses stripping, difficult accumulation descending, uneven cooking, single cooking method, single bleaching method and violent conditions existing in denaturizing production technique of wood pulp in the prior art. The invention comprises the following steps: wood pulp plate paging, alkali soaking, pressing, untwining and dispersion, cooking, washing, impurity removal, bleaching, a secondary washing and pulping; wherein, the wood pulp plate paging, alkali soaking, pressing, untwining and dispersion are to send papers into a alkali dipping barrel with concentration of 6 percent to 18 percent after the paper making bleaching wood pulp plates are separated by a paging device. When the wood pulp plates are changed into pulp with concentration of 3 percent to 6 percent, the pulp with concentration of 3 percent to 6 percent is sent to a squeezer to be squeezed and to untwine and disperse fiber. By adopting the invention, the quality of the dissolved viscose fiber wood pulp can be better and more stable; furthermore, the invention provides wider selection range of raw material.

Description

technical field [0001] The invention relates to a production method for denaturing papermaking grade softwood pulp board into dissolving grade viscose fiber pulp. Background technique [0002] With the development of my country's viscose fiber industry, domestic enterprises mostly use cotton pulp as the raw material for the production of viscose fiber. The resource of raw cotton linters is increasingly in short supply due to the constraints of planting area and growth cycle. Prominent, the impact of long cycle and ecological balance has seriously restricted the development of my country's viscose fiber industry. For this reason, some enterprises have used dissolving wood pulp for viscose production, but the price of imported dissolving wood pulp is high and fluctuating, which affects the normal operation and economic benefits of the enterprise. Finding a substitute for dissolving wood pulp is an important task for enterprises . [0003] At present, my country produces and i...

Claims

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Application Information

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IPC IPC(8): D21C3/00D21B1/12D21C1/06D21C7/00D21C3/02D21C3/04D21C9/02D21C9/08D21C9/12D21C9/16D21F13/00
Inventor 冯涛邓传东孙毅薛勤徐发祥饶芳秋宋伟柳永权黄俊
Owner YIBIN GRACE GROUP CO LTD
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