Method of monitoring macrostickies in recycling and paper or tissue making process involving recycled pulp

A technology for pulp and pulp, applied in the field of real-time analysis of large sticky matter, can solve problems such as continuous monitoring that does not involve dye injection

Active Publication Date: 2014-02-26
NALCO CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the treatment described by Sakai does not involve continuous monitoring of dye injections

Method used

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  • Method of monitoring macrostickies in recycling and paper or tissue making process involving recycled pulp
  • Method of monitoring macrostickies in recycling and paper or tissue making process involving recycled pulp
  • Method of monitoring macrostickies in recycling and paper or tissue making process involving recycled pulp

Examples

Experimental program
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Embodiment

[0077] Such as figure 2 A portable batch analyzer using a flow cell and optical imaging system shown in , was tested on continuous pulp flow in a closed loop circulation system. The analyzer consisted of a barrel mixer, including a pulp preheater when required, and thermocouples, the mixer was mixing at 400 rpm, a flow rate of 1.2 gpm, and the temperature was maintained by a heated external blanket. The optical system can be used as a benchtop instrument or reconfigured for continuous on-line monitoring. For these examples, a benchtop setup was used. Fresh pulp is sampled from a first source. Fresh pulp is made from recycled fibers and then diluted 1:4 with water to 15L. With mixing, Nile Red dye was added to the dilute slurry, 30 ml of a 0.1% by weight dye solution in isopropanol, and recordings were started immediately (except for the demonstration experiments in Table II). The data obtained are stored electronically. Using the appropriate camera and imaging processing...

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Abstract

A challenge in using recycled material in the papermaking process is the presence of hydrophobic organics with adhesive properties commonly known as stickies. Hydrophobic agglomerates can result in spots or defects in the final paper product or deposit on papermaking equipment resulting in poor runnability and downtime. Technologies for monitoring and controlling microstickies exist. However, a need exists for a technique to rapidly determine the size and content of macrostickies (diameter > 100 microns) in recycled pulp process streams. The present invention is a device and method to perform real-time macrostickies and / or any visible hydrophobic particle analysis in an aqueous medium. Using the present invention, furnish quality can be monitored and treatment performance can be monitored and controlled. The technique is based on fluorescence image analysis to identify and count sticky particles as well as measure their size

Description

technical field [0001] The present invention relates to a method of measuring the concentration and size of visible hydrophobic particles ("big stickies") in a flowing pulp slurry. More specifically, the present invention relates to an apparatus and method for performing macrosticky analysis in real time in a flowing pulp stream. The method uses fluorescence image analysis to identify and count macrostickies and measure their size. Background technique [0002] The characterization of visible hydrophobic particles, especially in aqueous media, is an important general problem with particular application in the pulp and paper industry, especially when dealing with secondary fibers. The deposition of stickies and stickies and the formation of large agglomerates of hydrophobic material are major obstacles in the manufacture of paper and tissue from recycled fiber. For paper grades, these non-polar viscous contaminants, especially when released during repulping, can become unde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/01D21C9/00G01N21/88G01N21/77
CPCG01N33/343G01N21/643G01N21/85G01N21/6458G01N21/6486Y02W30/64D21H17/01D21C9/00G01N21/88G01N21/77G01N21/6445D21F7/00
Inventor W·A·冯德拉塞克B·布拉泽森S·M·舍甫琴柯M·J·穆尔西亚
Owner NALCO CO
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