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Use of hydrophobic dyes to monitor hydrophobic contaminants in a papermaking process

A technology of pollutants and hydrophobicity, applied in paper testing, analytical materials, measuring devices, etc., can solve problems such as disparity in hydrophobicity

Inactive Publication Date: 2012-02-15
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although different fixatives can achieve the same turbidity, the hydrophobicity of each sample varies greatly

Method used

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  • Use of hydrophobic dyes to monitor hydrophobic contaminants in a papermaking process
  • Use of hydrophobic dyes to monitor hydrophobic contaminants in a papermaking process
  • Use of hydrophobic dyes to monitor hydrophobic contaminants in a papermaking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Slurry samples were taken from various locations in the wet end of the paper machine as shown. Long fibers were removed from the sample by passing the sample through a 150 micron screen. To measure the turbidity of the filtrate, 6 microliters of a 0.01% by weight Nile red dye alcohol solution was added to 3 mL of the filtrate, and then the fluorescence of the filtrate was measured. The result is as figure 1 , showing that turbidity and hydrophobicity (or the presence of contaminants) are not necessarily related to each other.

Embodiment 2

[0069] Preparation of coated waste paper: Coated waste paper was prepared by cutting the dried coated paper into 1.5 by 1.5 inch squares. 140 grams of dry coated waste paper was soaked in 3860 milliliters of synthetic tap water for 20 minutes to a target consistency of 3.5% by weight. The samples were then transferred to a 4 liter capacity Adirondack pulper and repulped at setting 5 for 90 minutes.

[0070] figure 2 The hydrophobicity of untreated coated waste paper is shown, as well as the hydrophobicity of treated coated waste paper filtrates filtered through media of different sizes (0.8, 3, 5, 10 and 76 microns). Measurement of fluorescence on each filtrate indicated the particle size region containing the highest level of hydrophobic particles. The figure also shows that the white resin did not agglomerate after adding the fixative. The fixative reduces the overall hydrophobicity but maintains the particle size distribution curve.

Embodiment 3

[0072] A possible treatment procedure for coated waste paper samples was evaluated using this hydrophobicity test method.

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Abstract

A method of monitoring and controlling one or more types of hydrophobic contaminants in a papermaking process is disclosed. The methodology utilizes the measurement of hydrophobic dyes, which are capable of fluorescing and interacting with the hydrophobic contaminants. In addition, a method of determining the relative size of the hydrophobic contaminants is disclosed as well.

Description

field of invention [0001] The present invention relates to the measurement and control of hydrophobic contaminants. Background technique [0002] Hydrophobic / organic contaminants such as natural pitches, stickies, tackies and white resins are major obstacles in papermaking as these materials released during papermaking become Unfavorable components of furnish, and when these materials are deposited, can prevent the correct operation of mechanical parts, thereby causing trouble to papermaking equipment. [0003] The increasing use of secondary fibers, coated waste paper and machine-made slurries in the papermaking process leads to the accumulation of organic pollutants. These contaminants form deposits that affect machine operability and final product quality. Contaminants are controlled primarily by chemical fixation, so their effectiveness depends on the ability to determine the correct procedure and application. Historically, a common method used to assess process perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/34G01N21/64G01N21/85
CPCG01N33/343G01N2021/6439G01N21/64G01N21/85G01N2021/6417
Inventor A·热利L·M·舍曼M·J·默西亚
Owner NALCO CO