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

A technology for printing ink and measuring method, applied in the field of secondary fiber reuse, can solve the problems of large error and inability to accurately characterize the actual content of ink, and achieve the effects of strict detection process, intuitive detection results, and small detection errors

Inactive Publication Date: 2010-06-30
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 th

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1 Calibration of iron content in ink

[0035] Place a set of A4 paper in a constant temperature and humidity room, weigh it after 24 hours, 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 constant temperature and humidity room Time, weigh and measure the moisture in the same way. Calculate the quality difference (absolute dry quantity) of the group of A4 papers before and after printing to obtain the ink quantity (absolute dry quantity) on the printing paper. This ink amount (absolute dry amount) is compared with the quality of the corresponding printing paper (absolute dry amount), which is the content of ink (absolute dry amount) relative to the printing paper (absolute dry amount) 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 unprinted A4 white...

Example Embodiment

[0038] Example 2

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

Example Embodiment

[0042] Example 3

[0043] Take 160g (absolute dry weight) double-sided laser printing paper, the specification is A4, print fixed content on each page (to ensure stable ink volume), and place it in a plastic bag for 24 hours to balance the moisture after printing. Then use a paper shredder to break into 6.3mm wide paper strips, put them into the Adirondack Formax pulper, add 0.005% of the deinking agent BRD 2349 (relative to the mass percentage of the absolute dry pulp), at 15% pulp concentration, 65 Disintegrate at ±2℃ for 25 minutes, then take 100g (absolute dry quantity) of crushed pulp, dilute it to 1% pulp consistency, pour it into Denver D 12 flotation tank, and flotation 5 at 43±2℃ minute. Take the pulp samples of the crushed pulp and the flotation good pulp respectively (at the same time take another sample to measure the moisture), and burn the ash in a muffle furnace after drying and carbonization, 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. The invention can be used for accurately quantifying the printing ink content, provides strong technical support for deinking control of waste paper, and gives 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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IPC IPC(8): G01N21/73
Inventor 李擘陈克复朱俊勇
Owner SOUTH CHINA UNIV OF TECH
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