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A fiber grading method and a graded pulp distributing device

A grading method and grading technology, applied in the field of pulp and paper making, can solve the problems of increasing equipment investment costs and maintenance costs, reducing product market competitiveness, and increasing paper production costs, saving equipment costs and investment costs, and saving raw materials. Cost, effect of simplified structure

Active Publication Date: 2021-10-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the complexity of the process, increases the investment cost and maintenance cost of equipment, especially for low value-added paper types, increases the production cost of paper, and reduces the market competitiveness of products

Method used

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  • A fiber grading method and a graded pulp distributing device
  • A fiber grading method and a graded pulp distributing device
  • A fiber grading method and a graded pulp distributing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment is a fiber grading method and a graded pulp distributing device for realizing the method.

[0034] The fiber classification method is to use the centrifugal force of the pulp distribution device to separate the long fibers and short fibers / fine fibers in the pulp, and then use different pulp outlet pipes on the pulp distribution device to separate the pulp with long fibers and short fibers / The slurry of fine fibers is sent to the corresponding distribution branch pipes in the headbox respectively, and finally the slurry is sprayed on the net by the headbox to form the corresponding paper level. During separation, the stock with long fibers is located at the periphery in the distribution unit and the stock with short / fines is located at the center of the stock distribution unit.

[0035] The structure of the graded pulp distribution device is as follows: Figure 1 to Figure 3 As shown, it includes a pulp inlet pipe 1, an outer cylinder 2, an inner cylin...

Embodiment 2

[0046] This embodiment is a graded pulp distributing device. Compared with Embodiment 1, the difference is that: Figure 5 or Figure 6 As shown, there are 10 short fiber pulp outlet pipes, 20 long fiber pulp outlet pipes, and the number of long fiber pulp outlet pipes is twice that of short fiber pulp outlet pipes. Therefore, the graded pulp distribution device of this embodiment can be applied to a three-layer headbox or supply pulp to three headboxes, the surface layer and the bottom layer of the long fiber pulp outlet pipe and the headbox or the surface layer headbox and the bottom layer The pulp distribution branch pipe of the headbox is connected, and the short fiber pulp outlet pipe is connected with the core layer of the headbox or the pulp distribution branch pipe of the core layer headbox.

Embodiment 3

[0048] This embodiment is a graded pulp distribution device. Compared with Embodiment 2, the difference is that: Figure 7 As shown, the long fiber outlet pipes are divided into two groups, and the diameters of the long fiber outlet pipes of each group are not equal, and the long fiber outlet pipes 4-1 with a small diameter and the long fiber outlet pipes 4-2 with a large diameter respectively occupy Half of them are 10 respectively, and they are arranged staggeredly along the circumference of the long-fiber pulp stabilization chamber. The diameter of the long-fiber pulp outlet pipe will affect the pulp output, thereby affecting the quantification of the corresponding pulp layer. Therefore, the middle surface of the paper can be adjusted accordingly. Quantitative layer and bottom layer, to meet different paper quality requirements.

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Abstract

The invention discloses a fiber classification method and a graded pulp distributing device. The method is to use the centrifugal force of the pulp distributing device to separate long fibers and short fibers / fine fibers in the pulp, and then use different outlets on the pulp distributing device to The pulp pipe sends the pulp containing long fibers and the pulp containing short fibers / fine fibers to the corresponding distribution branch pipes in the headbox respectively, and finally the headbox sprays the pulp on the net to form the corresponding paper level. The device includes a pulp inlet pipe, an outer cylinder, an inner cylinder, a long fiber pulp stabilization chamber, a short fiber pulp stabilization chamber, a long fiber pulp outlet pipe and a short fiber pulp outlet pipe. The inner cylinder is located in the middle of the outer cylinder, and the bottom of the inner cylinder is high At the bottom of the outer cylinder, the lower part of the outer cylinder is provided with a stock inlet pipe, and the upper part of the outer cylinder is provided with a long fiber stock stabilization chamber. The side wall of the long fiber stock stabilization chamber is distributed with multiple long fiber stock outlet pipes. The upper part of the inner cylinder is provided with a short fiber stock stabilizer. The pulp chamber, the side wall of the staple fiber stabilizing chamber is distributed with a plurality of staple fiber pulp outlet pipes. The invention can effectively simplify the technological process of fiber grading, has simple device structure and reduces production cost.

Description

technical field [0001] The invention relates to the technical field of pulping and papermaking, in particular to a fiber classification method and a classification type pulp distribution device. Background technique [0002] With the development of society and the improvement of people's living standards, the market has put forward higher and higher requirements for the quality of paper, such as household paper, which requires both good strength and very good softness, and packaging paper requires one side Smooth, suitable for printing, rough on one side, suitable for sticking closely with other materials. In addition, in order to reduce costs, long fibers should be used for the surface layer and bottom layer of the cardboard, and short fibers with relatively poor quality should be used for the core layer. [0003] In order to meet this requirement of paper, the current fourdrinier paper machine is realized by using multi-layer headbox or multiple headboxes, multiple sets o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F1/00
CPCD21F1/0018
Inventor 刘建安王欢欢樊慧明齐亚楠牟洪燕
Owner SOUTH CHINA UNIV OF TECH