CA2329935A1 - System and method for sheet measurement and control in papermaking machine - Google Patents

System and method for sheet measurement and control in papermaking machine Download PDF

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Publication number
CA2329935A1
CA2329935A1 CA002329935A CA2329935A CA2329935A1 CA 2329935 A1 CA2329935 A1 CA 2329935A1 CA 002329935 A CA002329935 A CA 002329935A CA 2329935 A CA2329935 A CA 2329935A CA 2329935 A1 CA2329935 A1 CA 2329935A1
Authority
CA
Canada
Prior art keywords
sheet
wet stock
water weight
wire
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002329935A
Other languages
French (fr)
Other versions
CA2329935C (en
Inventor
John D. Goss
Lee Chase
Hung-Tzaw Hu
John Preston
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell International Inc
Original Assignee
Honeywell-Measurex Corporation
John D. Goss
Lee Chase
Hung-Tzaw Hu
John Preston
Honeywell Inc.
Honeywell International Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honeywell-Measurex Corporation, John D. Goss, Lee Chase, Hung-Tzaw Hu, John Preston, Honeywell Inc., Honeywell International Inc. filed Critical Honeywell-Measurex Corporation
Publication of CA2329935A1 publication Critical patent/CA2329935A1/en
Application granted granted Critical
Publication of CA2329935C publication Critical patent/CA2329935C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/003—Indicating or regulating the moisture content of the layer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/09—Uses for paper making sludge
    • Y10S162/10—Computer control of paper making variables
    • Y10S162/11—Wet end paper making variables

Abstract

An array of sensors that are positioned underneath the wire of a paper making machine are employed to measure the conductivity of an aqueous wet stock.
Conductivity of the wet stock is directly proportional to the total water weight within the wet stock; consequently, the sensor provides information used to monitor and control quality of paper sheet produced. CD water weight profile is obtained practically instantaneously and the MD and CD variations are essentially decoupled.
Quality improvements to the sheet fabricated are achieved by providing fast control of the actuators and by tuning components to eliminate sources of variations. Dry stock weight of wet stock sheet resting on a water permeable moving wire can be measured employing a water weight sensor element positioned adjacent to the wire generating signals indicative of water weight of the sheet. The moisture level CD profile of a sheet of material can also be measured.
CA002329935A 1998-04-24 1999-04-12 System and method for sheet measurement and control in papermaking machine Expired - Fee Related CA2329935C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/066,802 US6168687B1 (en) 1998-04-24 1998-04-24 System and method for sheet measurement and control in papermaking machine
US09/066,802 1998-04-24
PCT/US1999/007947 WO1999055959A1 (en) 1998-04-24 1999-04-12 System and method for sheet measurement and control in papermaking machine

Publications (2)

Publication Number Publication Date
CA2329935A1 true CA2329935A1 (en) 1999-11-04
CA2329935C CA2329935C (en) 2009-06-16

Family

ID=22071812

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002329935A Expired - Fee Related CA2329935C (en) 1998-04-24 1999-04-12 System and method for sheet measurement and control in papermaking machine

Country Status (6)

Country Link
US (4) US6168687B1 (en)
EP (1) EP1137845B1 (en)
JP (1) JP2002513099A (en)
CA (1) CA2329935C (en)
DE (1) DE69937968T2 (en)
WO (1) WO1999055959A1 (en)

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Also Published As

Publication number Publication date
DE69937968D1 (en) 2008-02-21
CA2329935C (en) 2009-06-16
EP1137845B1 (en) 2008-01-09
US6168687B1 (en) 2001-01-02
US6126785A (en) 2000-10-03
JP2002513099A (en) 2002-05-08
EP1137845A1 (en) 2001-10-04
EP1137845A4 (en) 2005-06-01
US6059931A (en) 2000-05-09
DE69937968T2 (en) 2009-01-02
WO1999055959A1 (en) 1999-11-04
US6099690A (en) 2000-08-08

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