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Detection method for impedimental fine sticky substances in paper-making white water

A technology for papermaking white water and detection methods, which is applied in measurement devices, individual particle analysis, scientific instruments, etc., can solve the problem that there is no recognized detection method for small sticky substances, and achieves intuitive and conducive to judgment analysis and reliable detection results. Effect

Active Publication Date: 2012-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the particle size distribution characteristics of stickies in waste paper, the existing sticky detection methods can be roughly divided into two categories: large sticky and small sticky detection methods. Image analysis is more recognized for the detection of large sticky However, there is currently no recognized and feasible detection method for the detection of small stickies.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Detection of Obstructive Fine Stickies in White Water of Baishui Tower

[0028] First, take the white water from the white water tower of a newsprint machine in a paper mill. The absolute dry weight of the solids in the white water is 5g, and put it into a temperature and pressure control device (autoclave) for pretreatment. The treatment conditions are: the temperature is raised to 40 °C, Heating time 20min, normal pressure, rotating speed 300r / min, action time 30min, and then cool to room temperature; sieve the treated white water according to PulmacMasterScreen sieving method for large stickies, sieve plate sieve gap is 0.10mm, sieve residue is collected On the black filter paper, the surface is covered with white coated paper and heated, and the coated paper is removed to rinse the non-adhesive matter that does not adhere to the white coating on the surface of the black filter paper, then dry, scan with image analysis method, and use software statistics An...

Embodiment 2

[0033] Example 2 Detection of obstructive fine stickies in the white water of the Baishui Tower

[0034] First, take the white water in the white water tower of an old newsprint machine in a paper mill. The absolute dry weight of the solids in the white water is 5g, and put it into a temperature and pressure control device (high temperature and high pressure reactor) for pretreatment. The treatment conditions are: the temperature is raised to 40°C , the heating time is 30min, while the pressure rises to 0.08MPa, the rotating speed is 300r / min, and the action time is 30min, then it is released under reduced pressure, and cooled to room temperature; the treated white water is sieved according to the Pulmac MasterScreen screening detection method for large stickies, and sieved The sieve gap of the plate is 0.10mm, the sieve residue is collected on the black filter paper, the surface is covered with white coated paper and heated, and the coated paper is removed to rinse the non-adh...

Embodiment 3

[0039] Example 3 Detection of obstructive fine stickies in the white water of the Baishui Tower

[0040] First, take the white water in the white water tower of an old newsprint machine in a paper mill. The absolute dry weight of the solids in the white water is 5g, and add it to a temperature and pressure control device (high temperature and high pressure reactor) for pretreatment. The treatment conditions are: the temperature is raised to 90°C , the heating time is 30min, while the pressure rises to 0.08MPa, the rotating speed is 300r / min, and the action time is 30min, then it is released under reduced pressure, and cooled to room temperature; the treated white water is sieved according to the Pulmac MasterScreen screening detection method for large stickies, and sieved The sieve gap of the plate is 0.10mm, the sieve residue is collected on the black filter paper, the white coated paper covered on the surface is heated, and the coated paper is peeled off to rinse the non-adhe...

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Abstract

The invention discloses a detection method for impedimental fine sticky substances in paper-making white water. The method comprises the following steps of: respectively detecting a sticky substance content of pretreated white water and a sticky substance content of untreated white water under a normal temperature and pressure condition by adopting a large sticky substance Pulmac MasterScreen method and an image analysis method; and carrying out subtraction on two obtained detection results to obtain a content of harmful fine sticky substances in the white water, wherein the process of pretreating the white water comprises the following steps of: adding paper-making white water to be detected into a temperature and pressure control pretreatment device with a stirring function to act the white water for 10-60min at 20-90 DEG C under a pressure of -0.08-5MPa with a rotation speed of 100-2,000rpm, and then taking out. The method can be used for detecting the content of the fine sticky substances having adverse effects on paper machine running, paper quality, and the like in the white water and effectively evaluating the harm extent of the sticky substances in the white water for providing most direct technical references for white water closed circulation, a reasonable design of a system of the white water closed circulation, and the like.

Description

technical field [0001] The invention relates to a method for detecting fine stickies in papermaking white water, in particular to a method for detecting the content of fine stickies in papermaking white water that hinders the system during pulping and papermaking of waste paper, and belongs to the technical field of secondary fiber recycling . Background technique [0002] Waste paper stickies are a key problem faced by the paper industry, especially waste paper recycling enterprises, and it is also a technical problem. [0003] Although the wide application of a wide variety of adhesives facilitates people's daily life and improves the degree of office modernization, it is also inevitable that adhesive substances will be introduced into the waste paper recycling system through paper and books. As the demand for waste paper continues to increase, a large number of waste paper products are poured into the waste paper recycling system, and a large amount of impurities are als...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/14
Inventor 李擘武书彬王志伟刘道恒赵媛媛
Owner SOUTH CHINA UNIV OF TECH
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