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Pulping method and device of variable concentration paper pulp

A technology of variable density and pulp, which is applied in the field of pulp and paper industry, can solve the problems of high energy consumption, poor beating effect, and slow improvement of beating degree, etc., and achieve the effects of reducing production costs, improving quality, and improving physical strength indicators

Inactive Publication Date: 2012-05-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the beating of highly kinked fibers, the beating energy consumption is high, the beating degree is slow to increase, and sometimes the beating effect is even worse than that of the low-consistency mill

Method used

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  • Pulping method and device of variable concentration paper pulp
  • Pulping method and device of variable concentration paper pulp
  • Pulping method and device of variable concentration paper pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of beating method of variable consistency pulp in this embodiment comprises the following steps:

[0038] (1) Send the low consistency pulp with a concentration of 3 to 4% into the low consistency refiner for low consistency refining, and the fibers in the low consistency pulp are cut off;

[0039] (2) After low-consistency refining, the low-consistency pulp is sent to the thickening equipment, and the thickening equipment dehydrates and concentrates the low-consistency pulp to form medium-consistency pulp. At this time, the concentration of the medium-consistency pulp is C 0 ;

[0040] (3) The medium-consistency pulp is sent to the first medium-consistency refiner through the medium-consistency conveying equipment. At this time, the concentration of the medium-consistency pulp is set to C 1 , C 1 ≤C 0 , the flow rate is set to L 1 ;

[0041] (4) After the medium-consistency pulp is refined for the first time by the first medium-consistency refiner, it is se...

Embodiment 2

[0054] A kind of beating method of variable consistency pulp in this embodiment comprises the following steps:

[0055] (1) Send the low consistency pulp with a concentration of 3 to 4% into the low consistency refiner for low consistency refining, and the fibers in the low consistency pulp are cut off;

[0056] (2) After low-consistency refining, the low-consistency pulp is sent to the thickening equipment, and the thickening equipment dehydrates and concentrates the low-consistency pulp to form medium-consistency pulp. At this time, the concentration of the medium-consistency pulp is C 0 ;

[0057] (3) The medium-consistency pulp is sent to the first medium-consistency refiner through the medium-consistency conveying equipment. At this time, the concentration of the medium-consistency pulp is set to C 1 , C 1 ≤C 0 , the flow rate is set to L 1 ;

[0058] (4) After the medium-consistency pulp is refined for the first time by the first medium-consistency refiner, it is se...

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Abstract

The invention provides a pulping method and device of variable concentration paper pulp. The method comprises the following steps of: firstly, performing low concentration pulping to a low-concentration pulp material, sending to multiple stages of intermediate concentration pulping machines through a concentration increasing device for carrying out intermediate concentration pulping, and finally sending to a post-pulping pulp pool for storage or subsequent treatment. The device comprises a low concentration pulping machine, the concentration increasing device, an intermediate concentration conveying device, a first intermediate concentration pulping machine, a second intermediate concentration pulping machine and a third intermediate concentration pulping machine which are sequentially connected, wherein a first diluting unit is arranged between the first intermediate concentration pulping machine and the second intermediate concentration pulping machine, a second diluting unit is arranged between the second intermediate concentration pulping machine and the third intermediate concentration pulping machine, and an output end of the third intermediate concentration pulping machine is externally connected with the post-pulping pulp pool. The invention can fully exert the advantages of intermediate and low concentration pulping, not only solves the problem of cutting too much paper pulp by low concentration pulping, but also overcomes the defect that the intermediate concentration pulping is not applicable to the pulping of long fiber paper pulp to ensure that papermaking enterprises can solve the problem of difficult pulping caused by changed paper pulp raw materials so as to realize optimal pulping.

Description

technical field [0001] The invention relates to the field of pulp and papermaking industry, in particular to a beating method and device for pulp with variable consistency. Background technique [0002] At present, most of the commonly used papermaking raw materials are waste paper pulp, straw pulp, hardwood pulp, etc. A common feature of these raw materials is short fibers, among which waste paper pulp has the shortest fiber, followed by straw pulp, and hardwood pulp has slightly longer fibers. However, in order to increase the output, the growth cycle of fast-growing forests is getting shorter and shorter. The negative impact is that the pulp fibers are shortened. For the beating of short fibers, the medium-concentration beating can protect the length of the fibers. Compared with low-consistency beating, the physical index of the pulp after beating is higher, and at the same time, it saves power consumption. However, medium-consistency beating requires a higher concentrat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21D1/02
Inventor 朱小林刘焕彬李继庚黄运贤
Owner SOUTH CHINA UNIV OF TECH