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Method for measuring non-contact printing ink content in waster paper pulp and deinking effect evaluation method

A technology of printing ink and measurement method, which is applied in the field of secondary fiber recycling, can solve the problems of inaccurate representation of the actual ink content and large errors, and achieve the effects of intuitive detection results, strict detection process, and small detection errors

Inactive Publication Date: 2011-06-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since most of the waste paper in MOW is laser printing waste paper and copying waste paper, its printing principle and ink (that is, toner) composition are different from traditional printing waste paper, and the ink particles after shredding are larger and appear For flakes of different sizes, if the traditional whiteness value and ERIC value (that is, the effective residual ink concentration) method is used to detect, the error generated is larger than the detection results of conventional inks, and the actual content of the ink cannot be accurately represented. Accurate evaluation of deinking effect

Method used

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  • Method for measuring non-contact printing ink content in waster paper pulp and deinking effect evaluation method
  • Method for measuring non-contact printing ink content in waster paper pulp and deinking effect evaluation method
  • Method for measuring non-contact printing ink content in waster paper pulp and deinking effect evaluation method

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Effect test

Embodiment 1

[0034] The demarcation of iron content in the ink of embodiment 1

[0035] Place a group of A4 papers in a constant temperature and humidity room, weigh them after 24 hours, and take samples to measure the moisture content; then double-sided laser printing, the printed content on each page is fixed, and continue to be placed in the same temperature and humidity room time, weigh and measure moisture in the same way. Calculate the quality difference (dry weight) of the group of A4 papers before and after printing to obtain the amount of ink on the printing paper (dry weight). Comparing the amount of ink (absolute dry quantity) with the quality of the corresponding printing paper (absolute dry quantity), that is, the content of ink (absolute dry quantity) relative to printing paper (absolute dry quantity) in this printing mode, calculated Ink content T' in waste paper pulp p = 2.818%.

[0036] Take the above-mentioned double-sided laser printed A4 paper and 160g (dry weight) o...

Embodiment 2

[0039] Take 160g (dry weight) double-sided printing laser printing paper, the specification is A4, print a fixed content on each page (to ensure stable ink volume), and place it in a plastic sealing bag for 24 hours to balance the moisture after printing. Then disintegrate into 6.3mm wide paper strips with a paper shredder, put into the Adirondack Formax pulper, add 0.0025% deinking agent BRD 2349 (mass percentage relative to the absolute dry pulp), at 15% thick, 65 Disintegrate for 25 minutes under the condition of ±2°C, then take 100g (absolutely dry weight) of the crushed pulp, dilute it to 1% pulp concentration, pour it into the Denver D 12 flotation cell, and float at 43±2°C for 5 minute. Take the pulp samples of crushed pulp and flotation good pulp respectively (at the same time, take another sample to measure the moisture content), dry and carbonize, then burn the ash in the muffle furnace, and calculate the ash content A in the pulp before and after flotation p and A'...

Embodiment 3

[0043] Take 160g (dry weight) double-sided printing laser printing paper, the specification is A4, print a fixed content on each page (to ensure stable ink volume), and place it in a plastic sealing bag for 24 hours to balance the moisture after printing. Then disintegrate into 6.3mm wide paper strips with a paper shredder, put into the Adirondack Formax pulper, add 0.005% deinking agent BRD 2349 (mass percentage relative to the absolute dry pulp), at 15% thick, 65 Disintegrate for 25 minutes under the condition of ±2°C, then take 100g (absolutely dry weight) of the crushed pulp, dilute to 1% pulp concentration, pour it into the Denver D 12 flotation cell, and float at 43±2°C for 5 minute. Take the pulp samples of crushed pulp and flotation good pulp respectively (at the same time, another sample is taken to measure the moisture content), after drying and carbonization, burn the ash in the muffle furnace, and calculate the ash content A in the pulp before and after flotation ...

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Abstract

The invention discloses a method for measuring non-contact printing ink content in waster paper pulp and a deinking effect evaluation method, comprising: drying and weighing waster paper pulp sample, burning into ash content after charring, and weighing the weight of the ash content; calculating the ash purity Ap in the waster paper pulp; measuring iron content Ia in the ash content, and obtaining the iron content in the waster paper pulp Ip=Ap*Ia; sampling from the waster paper pulp with the known printing ink content Tp', measuring the iron content Ip' in the waster paper pulp, and calculating the iron content It in the printing ink; obtaining the actual printing ink content Tp in the pulp with the relational expression of Tp=Ip / It; respectively measuring the actual printing ink content Tp and T'p in the waster paper pulp before and after flotation; obtaining oven dry stock quantity P and P' before and after flotation by measuring the concentration of the waster paper pulp and weight the mass of the sizing agent; and calculating the actual deinking efficiency of flotation E=(P*Tp-P'*Tp')*100% / (P*Tp)=(Ip-yI'p)*100% / Ip. The invention can accurately quantify the printing ink content, provide strong technical support for deinking control of waste paper, and give more accurate evaluation to the deinking effect in the production practice of the waste paper.

Description

technical field [0001] The invention relates to the determination of the content of printing ink, in particular to a method for determining the content of non-contact printing ink in waste paper pulp. It belongs to the technical field of secondary fiber recycling. Background technique [0002] In recent years, with the rapid development of the world economy, people's demand for paper and paperboard has been increasing year by year. However, due to the impact of resources, environment, and benefits, especially in recent years, problems such as shortage of raw materials, energy crisis, and environmental pollution have become more and more serious. The world's paper industry is developing rapidly, and at the same time it is gradually changing to a modern production mode with high efficiency, high quality, high benefit, low consumption and low emission. As a rich fiber resource for papermaking, waste paper not only greatly alleviates the shortage of raw materials in the paperma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/73
Inventor 李擘陈克复朱俊勇
Owner SOUTH CHINA UNIV OF TECH
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