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Improved APMP pulping method

A technology of pulping and refining, applied in pulp beating/refining method, pulping with inorganic alkali, textiles and papermaking, etc., can solve the problem of limiting the use of mechanical pulp, which is not conducive to fully exerting APMP, and the internal bonding strength of paper Low-level problems, to achieve the effect of reducing production costs, improving quality, and high strength

Inactive Publication Date: 2010-06-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, it is difficult to achieve the organic combination of strength and bulk, which is not conducive to giving full play to the characteristics of APMP, limits the final paper-forming performance of the obtained pulp, and restricts the full play of the performance of APMP pulp
Especially after increasing the amount of APMP, the paper has the obvious problem of low internal bonding strength, which limits the amount of chemical-mechanical pulp used in paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;

[0016] 2) Pre-steaming: pre-steaming the washed wood chips at 90°C for 10 minutes;

[0017] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0 and then impregnate them in DTPA or EDTA at 50°C for heavy metal chelation; after chelation, they can be reused for 1 : 2.8~4.0 extruding screw machine carries out extruding, after extruding, add the alkaline H that the pH value of 2% of wood chip quality is 10 2 o 2 , react at 60°C for 50 minutes to obtain a slurry;

[0018] 4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 35%, and the freeness of the pulp after refining is controlled at 700-750ml; after refining, add 5% H of wood chip quality. 2 o 2 Bleaching is carried out for 60-90 minutes...

Embodiment 2

[0022] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;

[0023] 2) Pre-steaming: pre-steaming the washed wood chips at 85°C for 15 minutes;

[0024] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0, and then impregnate them in DTPA or EDTA for heavy metal chelation at 40°C; after chelation, they can be used for 1 : 2.8~4.0 extruding screw machine is extruded, after extruding, add the alkaline H of 1.8% of wood chip quality pH value to be 11 2 o 2 , react at 40°C for 70 minutes to obtain a slurry;

[0025] 4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 40%, and the freeness of the pulp after refining is controlled at 700-750ml; after refining, add 4% H of wood chip quality. 2 o 2 Bleaching is carried out for 60-90 minutes. After bleachi...

Embodiment 3

[0029] 1) Washing of wood chips: take wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm, and wash with water to remove sediment;

[0030] 2) Pre-steaming: pre-steaming the washed wood chips at 80°C for 20 minutes;

[0031] 3) Extrusion and impregnation: Extrude the pre-steamed wood chips with an extrusion screw machine of 1:2.8-4.0 and then impregnate them in DTPA or EDTA for heavy metal chelation at 60°C; : 2.8~4.0 extruding screw machine is extruded, after extruding, add the alkaline H of 1.5% of wood chip quality pH value to be 12 2 o 2 , and reacted at 50°C for 60 minutes to obtain a slurry;

[0032]4) Refining: the above-mentioned obtained slurry is subjected to one-stage refining at a mass concentration of 45%, and the freeness of the pulp after refining is controlled at 700 to 750ml; after refining, add 4.5% H of wood chip quality. 2 o 2 Carry out bleaching for 60-90 minutes. After bleaching, dilute the pulp to a mass concen...

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Abstract

The invention discloses an improved APMP pulping method. In the method, different pulp grinding processes are used for obtaining an APMP with a high ionization degree, and the high rigidity of the APMP is used for providing a loose and thick framework for prepared paper; and an APMP with a low ionization degree is used for providing sufficient bonding force for the framework to ensure that the strength and the bulk of APMP prepared paper are combined organically so as to realize the opposition of weakening the strength and the bulk of an APMP prepared pulp. By comparing the APMP prepared pulp with a chemical-mechanical pulp with the same ionization degree produced under the original process production condition, the APMP prepared pulp can have a higher bulk while keeping a certain strength, or have a higher strength while keeping a certain bulk, so the quality of produced paper is improved, or the mixing ratio of the APMP in the process of producing paper is increased to reduce the paper production cost.

Description

technical field [0001] The present invention relates to an improved APMP pulping method. Background technique [0002] APMP (Alkaline Peroxide Mechanical Pulp), translated in Chinese as alkaline hydrogen peroxide mechanical pulp, is an environmentally friendly and energy-saving new pulping process introduced in the 1980s, with high yield, high whiteness, and high light scattering performance And low pollution, low cost and other outstanding advantages. [0003] The process route of APMP pulping is generally as follows: wood chips with a length of 15-20 mm, a thickness of 3-5 mm, and a width of less than 10 mm are washed with water to remove sediment; pre-steamed at 80-90°C for 10-20 minutes; A two-stage extruder with a compression ratio of 1:2.8 to 4.0 is extruded and impregnated with a chelating agent and a total amount of 30% alkaline H 2 o 2 , into the corresponding reaction chamber to react for 30-60 minutes; after the reaction, the pulp is refined once at a concentra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/02D21D1/00
Inventor 张美云王建夏新兴吴养育陆赵情李金宝魏晓芬董和滨
Owner SHAANXI UNIV OF SCI & TECH
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