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Fluorometric method for monitoring surface additives in a papermaking process

一种表面添加剂、造纸工艺的技术，应用在纸浆原料添加过程、造纸、纸测试等方向，能够解决失效相关的风险大等问题

Active Publication Date: 2013-08-28
NALCO CO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While this allows for a significant reduction of starch in the range of 50%-70%, the risks associated with failure due to unpredictable and uncontrolled changes in starch acquisition are too great to overcome

Method used

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  • Fluorometric method for monitoring surface additives in a papermaking process
  • Fluorometric method for monitoring surface additives in a papermaking process

Examples

Experimental program
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Embodiment approach

[0015] As described above, one or more surface additives added to the papermaking process are tracked by a fluorescence-based approach. This requires that the medium exposed to fluorescence is suitable for fluorescence measurements, such as exciting the entire film depth of the coating and collecting its emission. One of ordinary skill in the art can determine this without undue experimentation.

[0016] Fluorescence protocols include methods in which: (1) one or more surface additives are capable of fluorescing, are inherently fluorescing and / or are modified to fluoresce, such as with fluorescent moieties or by reacting with molecules within the system or by removing Other than intrinsic features, (2) addition of one or more inert fluorescent tracers in known ratios to surface additives, or (3) combinations thereof.

[0017] When the surface additive is capable of fluorescing, the fluorescence can be directly correlated to the concentration of the surface additive within the...

Embodiment 1

[0069] Tests were run according to the above protocol with three starch solutions containing progressively larger starch solids while keeping the ratio of starch to inert fluorescent tracer constant. The substrate for each test was an uncoated blackjack paperboard sheet. Each solution was applied to a separate sample sheet at four different thicknesses via the manual application method. A fourth starch solution containing no inert fluorescent tracer was also applied to a series of sample sheets for comparison with the tracer solution. The blank sample used in this test was an uncoated sample sheet.

[0070] figure 2 The dry coating weight (coating amount, in g / cm2) of starch plotted against the fluorescence intensity (arbitrary units - relative fluorescence units ("RFU")) is shown. 2 express). Each point corresponds to a single sample sheet. figure 2 It is shown that the measured fluorescence intensities for the entire series of sample sheets measured fall on the line a...

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Abstract

A method of monitoring and optionally controlling the addition of one or more surface additives to a papermaking process is disclosed. The method comprises the following steps: (a) adding a known amount of one or more surface additives to a papermaking process either alone or in known proportion with a known amount of one or more inert fluorescent tracers, wherein the surface additives can only be added alone when the surface additives are capable of fluorescing; (b) measuring the fluorescence of the surface additives and / or one or more inert fluorescent tracers at a point subsequent to adding the surface additives and after a sheet has been formed, wherein the surface additives can only be measured when they are capable of fluorescing and wherein fluorescence is measured with a reflectance based fluorometer; (c) correlating the amount of fluorescence of the surface additives when they are capable of fluorescing and / or inert fluorescent tracers on a sheet with the concentration of the surface additives in a coating on a sheet and / or thickness of a coating on a sheet; and (d) optionally controlling the addition of one or more surface additives to a papermaking process by adjusting the amount of the surface additives added to the papermaking process in response to the coating thickness on a sheet and / or concentration of the surface additives in a coating on a sheet.

Description

field of invention [0001] The present invention relates to monitoring and optionally controlling the addition of one or more surface additives to a papermaking process. Background of the invention [0002] Current measures for measuring the amount of surface additives generally consist of manual techniques of sheet disintegration and / or mass balance calculations, which are intrinsically related. [0003] In the case of starch capture at the size press, the papermaker (e.g., a board manufacturer) will in many cases overapply the amount of starch added to the papermaking process in order to ensure that enough starch is maintained on the sheet on the surface for functional purposes. Past trials included metered size press applications, which allowed starch reduction via foliar application techniques. While this allows for a significant reduction of starch in the range of 50%-70%, the risks associated with failure due to unpredictable and uncontrolled changes in starch acquisi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G01N21/86G01N33/34G01B11/06D21H21/30
CPCG01N2021/8427D21H19/36G01N2021/6484D21H21/30D21H23/78G01N33/346G01N21/8422D21H19/54G01N2021/8917G01N21/643G01N2021/8416G01N21/91G01N21/86
Inventor 詹姆士·L·托马斯奥利维尔·克罗特罗德尼·H·班克斯
Owner NALCO CO
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