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Method for improving removal effect of stickies in waste paper pulp

A technology for stickies and waste paper pulp, which is applied in the field of improving the ink removal effect in waste paper pulp and the removal of stickies in waste paper pulp, and can solve the problem of control of stickies. Improvement and other problems, to achieve the effect of obvious improvement in removal effect, easy application and improved removal effect

Inactive Publication Date: 2010-06-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The removal of stickies is mainly two units of screening and flotation, in which flotation is the removal of small sticky particles on the basis of screening and removing large sticky particles, and its removal effect is directly related to the sticky The degree of negative impact caused by the paper machine part is the key to the control of stickies, but the existing waste paper pulp flotation technology mainly focuses on the removal of ink, and the removal of stickies is only incidental and not targeted The technological improvement of the paper machine has resulted in the situation that the control of some stickies in the paper machine is becoming more and more difficult, and the impact of stickies is becoming more and more serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Select self-adhesive paper, copy paper and envelope paper with a total absolute dry weight of 360g, and mix according to the following ratio: 4.5% self-adhesive paper, 47.75% copy paper, 47.75% envelope paper, at a temperature of 46±2°C, Disintegrate under the condition of 15% pulp concentration for 8 minutes, then take 200g dry weight of crushed pulp and screen it in a screen with a sieve gap of 0.15mm, and then take 90g dry weight of fine pulp after sieving to dilute to 1% pulp Thick, add 0.1% polyether non-ionic surfactant relative to the weight of dry pulp, and add 0.01% anionic polyacrylamide relative to the weight of dry pulp at the same time, the average molecular weight is 5000, and after mixing evenly, the Flotate for 5 minutes at 2°C. Take good pulp and make 60g / m 2 16 handwritten slices were stained with a staining agent with a concentration of 0.067% of Prussian blue and heptane solution, dried and scanned for image analysis (scanner and analysis software: ...

Embodiment 2

[0027] Select self-adhesive paper, copy paper and envelope paper with a total absolute dry weight of 360g, and mix according to the following ratio: 4.5% self-adhesive paper, 47.75% copy paper, 47.75% envelope paper, at a temperature of 46±2°C, Disintegrate under the condition of 15% pulp concentration for 8 minutes, then take 200g dry weight crushed pulp and screen it in a sieving machine with a sieve gap of 0.15mm, take 90g dry weight crushed pulp and dilute it to 1% pulp concentration , add 0.1% of the alkylphenol polyoxyethylene ether non-ionic surfactant relative to the weight of the dry pulp, and add 0.025% of the sodium polyacrylate relative to the weight of the dry pulp at the same time, the average molecular weight is 2100, after mixing evenly Flotate for 5 minutes at 46±2°C. Take good pulp and make 60g / m 2 16 hand-written slices were stained with a staining agent with a concentration of 0.067% of Prussian blue and heptane solution, dried and scanned for image analys...

Embodiment 3

[0031] Get 160g (absolute dry weight) old newsprint and old magazine paper (proportioning is 90: 10), add 1% sodium silicate (relative to pulp absolute dry mass), 0.5% sodium sulfite (relative to pulp absolute dry mass), in 10% pulp concentration, crushed for 20 minutes under the temperature condition of 60±2°C, after crushing, the pulp was diluted to 1% pulp concentration, and 0.2% (relative to the absolute dry mass of pulp) of fatty alcohol polyoxyethylene ether non-ionic dehydrator was added. Ink, and 0.1% (relative to pulp dry weight) sodium polymethacrylate, the average molecular weight is 8000, after stirring evenly, float at 43±2°C for 5 minutes. Take the good pulp after flotation and sieve it in the plumac sieve, collect the sieved pulp residue on the surface of the black filter paper, cover it with special white coated paper and heat it, and remove the coated paper without adhesion to the surface of the black filter paper The white-coated non-stickies are rinsed and t...

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Abstract

The invention discloses a method for improving a removal effect of stickies in waste paper pulp. The method comprises the steps of: breaking waste paper comprising the stickies accounting for less than or equal to 10 percent of the weight of the waste paper at the temperature of between 40 and 60 DEG C first; placing pulp obtained after the breaking into a pulp screen, and screening the pulp under the condition that the screening water temperature is between 40 and 60 DEG C; and diluting accepts obtained after the screening until the weight concentration of the paper pulp is between 0.8 and 1.5 percent, adding 0.01 to 0.5 percent of nonionic surfactant into the pulp based on the absolute dry mass of the paper pulp, adding 0.0025 to 0.5 percent of anionic dispersant, and floating at the temperature of between 40 and 50 DEG C after the mixture is stirred uniformly, wherein the anionic dispersant is one of anionic polyacrylamide, polyacrylate and polymethacrylate. The method has a more remarkable effect on the removal of the stickies such as pressure-sensitive adhesives and hot melt adhesives in most of waste paper pulp comprising an ONP, an OMG, an MOW and the like.

Description

technical field [0001] The invention relates to the removal of stickies in waste paper pulp, in particular to a method for improving the ink removal effect in waste paper pulp. It belongs to the technical field of secondary fiber recycling. Background technique [0002] Adhesives in waste paper are a major problem plaguing the paper industry today. In recent years, with the rapid development and wide application of labels containing adhesives and various coated papers, adhesives have entered waste paper The characteristics of size, shape and viscosity after the circulation system have also become various, which has a serious impact on the operation of the paper machine and the quality of the paper, making the sticky problem faced by the waste paper recycling system increasingly serious. Therefore, Effectively removing stickies and reducing their negative impact on paper machine parts has become the main task of stickies control in the current waste paper recycling process. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/32D21C5/02D21H21/08D21H21/24
CPCY02W30/64
Inventor 李擘陈克复王高升朱俊勇
Owner SOUTH CHINA UNIV OF TECH
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