US20070107867A1 - Method for determining paper strength - Google Patents

Method for determining paper strength Download PDF

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Publication number
US20070107867A1
US20070107867A1 US11/559,523 US55952306A US2007107867A1 US 20070107867 A1 US20070107867 A1 US 20070107867A1 US 55952306 A US55952306 A US 55952306A US 2007107867 A1 US2007107867 A1 US 2007107867A1
Authority
US
United States
Prior art keywords
web
fibrous web
strength property
draw
fibrous
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.)
Abandoned
Application number
US11/559,523
Other languages
English (en)
Inventor
Rainer Schmachtel
Soren Koster
Rudolf Munch
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOSTER, SOREN, DR., MUNCH, RUDOLF, SCHMACHTEL, RAINER, DR.
Publication of US20070107867A1 publication Critical patent/US20070107867A1/en
Abandoned legal-status Critical Current

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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/346—Paper paper sheets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/022—Environment of the test
    • G01N2203/0248—Tests "on-line" during fabrication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/026—Specifications of the specimen
    • G01N2203/0262—Shape of the specimen
    • G01N2203/0278—Thin specimens
    • G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes

Definitions

  • This invention relates to a method for determining at least one strength property of a fibrous web during its production, the fibrous web being in particular a paper web, paperboard web or tissue web.
  • a method for determining at least one strength property of a fibrous web during its production has the following steps: determining the web draw and the tension of the fibrous web resulting therefrom; determining the actual state of at least one controlled variable influencing the strength property of the fibrous web; and determining the actual state of the at least one strength property of the fibrous web by way of a model which creates a dependency of the strength property on the web draw, the web tension and the at least one controlled variable.
  • the method of the present invention is based on the idea of determining at least one strength property indirectly by means of a suitable model which takes account of directly measurable properties of the fibrous web and of controlled variables that can be influenced during the production process. Hence it is no longer necessary, as known from the prior art, to measure a strength value directly, which up to now is possible only in the laboratory.
  • the method of the present invention proposes to determine the web draw and the web tension resulting therefrom. This is particularly advantageous because today already the web draw and the web tension resulting therefrom are determined on paper machines in order to control the suitable coil hardness and error-free winding when winding up the paper web for example. Therefore, for the method of the present invention it is possible to use sensors which are already installed on the paper machine.
  • the at least one strength property can be controlled during production of the fibrous web on the basis of its determined actual value.
  • an embodiment of the present invention provides for the following additional process steps: comparing the actual state of the at least one strength property with the desired state of the at least one strength property; and changing the actual state of the at least one controlled variable in order to establish the desired state of the at least one strength property.
  • the present invention thus creates an automatic machine control system which is capable of optimizing, during production, the controlled variables or process parameters with regard to the strength of the fibrous web.
  • the at least one strength property of the fibrous web can include its bursting strength, its longitudinal and/or transverse elongation at break, its tensile strength and its breaking length.
  • the web draw and the web tension resulting therefrom are determined in the winding up area.
  • the sensors provided on the paper machine for controlling the winding up process can thus be used.
  • the web draw and the web tension, as well as the actual state of the at least one controlled variable are determined online.
  • the web draw and the web tension and/or the at least one controlled variable are determined continuously or in fixed time intervals for example.
  • the model can be in particular a self-learning model which in the event of deviations between indirectly and directly determined values of the at least one strength property automatically carries out a corresponding adjustment of the parameters.
  • the at least one strength property is measured on a sample of the fibrous web, which was taken from the finish-produced fibrous web or from the finish-wound reel.
  • the directly measured values of the at least one strength property are determined in this case in the laboratory.
  • measured values of the at least one strength property can also be used for the continuous or regular calibration of the sensors measuring the web draw and the web tension.
  • the model used in the method of the present invention takes account of not only the web draw, the web tension and the actual state of the at least one controlled variable but also of the type of fibrous web and/or specific characteristics of the production process used and/or the design of the machine producing the fibrous web, which means that the model is refined further.
  • the actual state of the at least one strength property indirectly determined with the model corresponds very closely to the real value of the actual state of the at least one strength property, as can be determined with the direct measurement in the laboratory.
  • the strength of the fibrous web is co-defined by the composition of the pulp suspension for example, meaning by the chemical additives, the fibrous material or fibrous materials used, the ratio of fibrous materials to each other when more than one fibrous material is used, or by the filler material fraction for example.
  • An embodiment of the present invention provides accordingly for the at least one controlled variable to include the composition of the pulp suspension used for the production of the fibrous web.
  • An additional or alternative embodiment of the present invention provides for the at least one controlled variable to include the ratio of web draws at various points of the fibrous web production process.
  • the bursting strength of the fibrous web is co-defined essentially by the ratio of the web draw upstream from the last press nip of the press section to the web draw downstream from the last press nip of the press section.
  • Another embodiment of the present invention provides for a transverse profile of the at least one strength property to be determined by the fibrous web being divided into several sections extending respectively over a subwidth of the fibrous web and by the web draw and the web tension resulting therefrom then being determined for each section.
  • the transverse profile of the at least one strength property can be determined on a web cutting machine for example.
  • the machine-wide reel is divided into several narrow paper reels.
  • FIG. 1 is a schematic representation of a machine suitable for performing the method of the invention.
  • a paper machine 1 with a pulp preparation section 2 , a forming section 3 , a press section 4 , a drying section 5 and a winding apparatus 6 for winding up a finish-produced paper web 7 .
  • the paper machine 1 also has a control unit 8 for controlling the paper production process.
  • the control unit 8 includes a subunit 9 with which the at least one strength property, in this concrete case the bursting strength of the paper web 7 , is controlled during the production processes.
  • a sensor 10 Provided in the area of the winding apparatus 6 is a sensor 10 with which the web draw and the web tension of the paper web 7 resulting therefrom can be determined.
  • the subunit 9 for controlling the bursting strength of the paper web 7 performs the following steps. Using the sensor 10 , the web draw and the tension of the paper web 7 resulting therefrom are determined. Furthermore, the actual state of the fibrous material composition in the pulp preparation section is determined using sensors 11 , and the actual state of the ratio of the web draw upstream from the last press nip of the press section 4 to the web draw downstream from the last press nip of the press section 4 is determined using sensors 12 and 13 .
  • the data thus obtained is sent to the subunit 9 which, using a model, determines the bursting strength of the paper web 7 on the basis of this data and with account taken of other process data supplied by a process data monitoring unit 14 and, for example, with account taken of the type of paper web 7 and/or specific characteristics of the production process used and/or the design of the paper machine 1 .
  • the subunit 9 it is also possible to calibrate the sensors 11 to 13 on the basis of bursting strength values which were determined in the laboratory on the finish-produced paper web 7 .
  • the actual state of the bursting strength is then compared with the desired state of the bursting strength and, on this basis, the actuators 15 , 16 and 17 are actuated by the subunit 9 in order to adjust the actual state of the bursting strength to the desired state by the actual state of the controlled variables—fibrous material composition in the pulp preparation section 2 and ratio of the web draw upstream from the last press nip of the press section 4 to the web draw downstream from the last press nip of the press section 4 —being changed accordingly.
  • the web draw and the web tension during winding up, as well as the controlled variables, are defined online and continuously.
US11/559,523 2005-11-15 2006-11-14 Method for determining paper strength Abandoned US20070107867A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005054825A DE102005054825A1 (de) 2005-11-15 2005-11-15 Verfahren zur Bestimmung der Papierfestigkeit
DE102005054825.3 2005-11-15

Publications (1)

Publication Number Publication Date
US20070107867A1 true US20070107867A1 (en) 2007-05-17

Family

ID=37726883

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/559,523 Abandoned US20070107867A1 (en) 2005-11-15 2006-11-14 Method for determining paper strength

Country Status (3)

Country Link
US (1) US20070107867A1 (de)
EP (2) EP1785526A3 (de)
DE (1) DE102005054825A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160031685A1 (en) * 2013-04-17 2016-02-04 Parkburn Precision Handling Systems Limited Load bearing apparatus and method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2275812A1 (de) 2009-07-15 2011-01-19 Stichting Dutch Polymer Institute Vorrichtung zur Überwachung der mechanischen Eigenschaften eines beweglichen faserartigen oder ebenen Körpers und Überwachungsverfahren
DE102016216387A1 (de) 2016-08-31 2018-03-01 Voith Patent Gmbh Verfahren zur Steuerung einer Faserstoffbahnherstellungsmaschine
DE102019103401A1 (de) * 2019-02-12 2020-08-13 Voith Patent Gmbh Dickenmessung
DE102019103703B4 (de) * 2019-02-14 2021-10-07 Voith Patent Gmbh Vorrichtung und Verfahren zur Beschichtung sowie Computerprogrammprodukt

Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956300A (en) * 1956-09-17 1960-10-18 Oxy Dry Sprayer Corp Web tensioning and cleaning apparatus
US3886036A (en) * 1972-03-13 1975-05-27 Measurex Corp Method of controlling a drier limited paper machine
US4151594A (en) * 1976-02-26 1979-04-24 Bobst-Champlain, Inc. Web tension control for high-speed web handling equipment
US5013403A (en) * 1987-10-05 1991-05-07 Measurex Corporation Process for continuous determination of paper strength
US5052233A (en) * 1988-09-14 1991-10-01 Valmet Paper Machinery Inc. Method and apparatus for measurement of web tension
US5104488A (en) * 1987-10-05 1992-04-14 Measurex Corporation System and process for continuous determination and control of paper strength
US5674551A (en) * 1995-11-20 1997-10-07 Valmet Corporation Method and apparatus for coating a moving paper web
US5730693A (en) * 1996-01-02 1998-03-24 Krayenhagen; Everett D. Web tension control system
US5964390A (en) * 1994-11-23 1999-10-12 Sca Hygiene Products Ab Arrangement and web tension control unit for web delivery
US6012669A (en) * 1998-06-03 2000-01-11 Tharpe, Jr.; John M. Apparatus for controlling tension in a web of fabric and associated methods
US6193184B1 (en) * 1996-11-01 2001-02-27 Tetra Pak Hoyer A/S Method and a system for controlling tension of paper and foil webs
US6200422B1 (en) * 1999-06-24 2001-03-13 Neles Paper Automation Oy Method and apparatus for controlling a moving paper web
US6314333B1 (en) * 1998-07-03 2001-11-06 Kimberly-Clark Worldwide, Inc. Method and apparatus for controlling web tension by actively controlling velocity and acceleration of a dancer roll
US6319362B1 (en) * 1997-11-25 2001-11-20 Metso Paper Automation Oy Method and equipment for controlling properties of paper
US6328851B1 (en) * 1997-11-25 2001-12-11 Metso Paper Automation Oy Method and equipment for controlling properties of paper
US6352615B1 (en) * 1997-05-30 2002-03-05 Valmet Corporation Method and equipment in a paper/board machine for regulation of the difference of draw
US6391158B1 (en) * 2000-06-30 2002-05-21 Westvaco Corporation Method for loose draw detection in a paper machine wet press
US6433499B1 (en) * 2000-11-29 2002-08-13 Heidelberger Druckmaschinen Ag Device and method for automatic tension transducer calibration
US20030116296A1 (en) * 2001-12-20 2003-06-26 Kimberly-Clark Worldwide, Inc. Method and apparatus for caliper control of a fibrous web
US20030115946A1 (en) * 2001-12-20 2003-06-26 Kimberly-Clark Worldwide, Inc. Method to measure tension in a moving web and to control properties of the web
US20030155395A1 (en) * 2002-01-08 2003-08-21 Metso Automation Oy Method and equipment in connection with a paper machine or a paper web finishing apparatus
US20030164228A1 (en) * 2002-03-01 2003-09-04 Rudolf Munch Method for the manufacture or treatment of a material web
US6629659B1 (en) * 1998-02-17 2003-10-07 Metso Paper, Inc. Method and apparatus for measuring web tension profile to control the reeling of a web
US6706149B2 (en) * 2001-06-28 2004-03-16 Voith Paper Patent Gmbh Web monitoring
US20040050518A1 (en) * 2000-09-29 2004-03-18 Hannu Latti Method for minimizing tension variation in a paper web induced by drying of the web in a paper machine
US20050055123A1 (en) * 2002-09-04 2005-03-10 The Procter & Gamble Company Method of adjusting a process output value
US7092781B2 (en) * 2004-12-10 2006-08-15 The Procter & Gamble Company Method of controlling tension in a web
US20060289692A1 (en) * 2005-06-24 2006-12-28 Horneck Craig F Apparatus for winding paper with static control
US20070095495A1 (en) * 2005-10-28 2007-05-03 Jorg Reuter Method and apparatus for producing a fibrous web
US20070151690A1 (en) * 2005-12-30 2007-07-05 Machattie Ross K Cross-machine direction actuators for machine clothing
US20070151689A1 (en) * 2005-12-29 2007-07-05 Honeywell Asca, Inc. Machine direction sensor system with cross direction averaging
US20070169906A1 (en) * 2006-01-26 2007-07-26 Rudolf Munch Method for producing or treating a fibrous web
US20080245495A1 (en) * 2005-05-11 2008-10-09 Hans Hogberg Apparatus for Measuring Tension in a Paper Web

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI89836C (fi) * 1985-05-02 1993-11-25 Measurex Corp Anordning samt foerfarande foer att bestaemma haollfastheten av en duk som loepa mellan tvao valsar
EP0541518B1 (de) * 1986-07-18 1995-08-16 Measurex Corporation Verfahren und Vorrichtung zur Ermittlung der Stärke bandförmiger Materialien

Patent Citations (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956300A (en) * 1956-09-17 1960-10-18 Oxy Dry Sprayer Corp Web tensioning and cleaning apparatus
US3886036A (en) * 1972-03-13 1975-05-27 Measurex Corp Method of controlling a drier limited paper machine
US4151594A (en) * 1976-02-26 1979-04-24 Bobst-Champlain, Inc. Web tension control for high-speed web handling equipment
US5013403A (en) * 1987-10-05 1991-05-07 Measurex Corporation Process for continuous determination of paper strength
US5104488A (en) * 1987-10-05 1992-04-14 Measurex Corporation System and process for continuous determination and control of paper strength
US5052233A (en) * 1988-09-14 1991-10-01 Valmet Paper Machinery Inc. Method and apparatus for measurement of web tension
US5964390A (en) * 1994-11-23 1999-10-12 Sca Hygiene Products Ab Arrangement and web tension control unit for web delivery
US5674551A (en) * 1995-11-20 1997-10-07 Valmet Corporation Method and apparatus for coating a moving paper web
US5730693A (en) * 1996-01-02 1998-03-24 Krayenhagen; Everett D. Web tension control system
US6193184B1 (en) * 1996-11-01 2001-02-27 Tetra Pak Hoyer A/S Method and a system for controlling tension of paper and foil webs
US6352615B1 (en) * 1997-05-30 2002-03-05 Valmet Corporation Method and equipment in a paper/board machine for regulation of the difference of draw
US6319362B1 (en) * 1997-11-25 2001-11-20 Metso Paper Automation Oy Method and equipment for controlling properties of paper
US6328851B1 (en) * 1997-11-25 2001-12-11 Metso Paper Automation Oy Method and equipment for controlling properties of paper
US6629659B1 (en) * 1998-02-17 2003-10-07 Metso Paper, Inc. Method and apparatus for measuring web tension profile to control the reeling of a web
US6012669A (en) * 1998-06-03 2000-01-11 Tharpe, Jr.; John M. Apparatus for controlling tension in a web of fabric and associated methods
US6314333B1 (en) * 1998-07-03 2001-11-06 Kimberly-Clark Worldwide, Inc. Method and apparatus for controlling web tension by actively controlling velocity and acceleration of a dancer roll
US6200422B1 (en) * 1999-06-24 2001-03-13 Neles Paper Automation Oy Method and apparatus for controlling a moving paper web
US6391158B1 (en) * 2000-06-30 2002-05-21 Westvaco Corporation Method for loose draw detection in a paper machine wet press
US6860033B2 (en) * 2000-09-29 2005-03-01 Metso Paper, Inc. Method for minimizing tension variation in a paper web induced by drying of the web in a paper machine
US20040050518A1 (en) * 2000-09-29 2004-03-18 Hannu Latti Method for minimizing tension variation in a paper web induced by drying of the web in a paper machine
US6433499B1 (en) * 2000-11-29 2002-08-13 Heidelberger Druckmaschinen Ag Device and method for automatic tension transducer calibration
US6706149B2 (en) * 2001-06-28 2004-03-16 Voith Paper Patent Gmbh Web monitoring
US20030116296A1 (en) * 2001-12-20 2003-06-26 Kimberly-Clark Worldwide, Inc. Method and apparatus for caliper control of a fibrous web
US20050034831A1 (en) * 2001-12-20 2005-02-17 Beuther Paul D. Method to measure tension in a moving web and to control properties of the web
US20030115946A1 (en) * 2001-12-20 2003-06-26 Kimberly-Clark Worldwide, Inc. Method to measure tension in a moving web and to control properties of the web
US20030155395A1 (en) * 2002-01-08 2003-08-21 Metso Automation Oy Method and equipment in connection with a paper machine or a paper web finishing apparatus
US7067039B2 (en) * 2002-01-08 2006-06-27 Metso Automation Oy Method and equipment in connection with a paper machine or a paper web finishing apparatus
US20030164228A1 (en) * 2002-03-01 2003-09-04 Rudolf Munch Method for the manufacture or treatment of a material web
US20050055123A1 (en) * 2002-09-04 2005-03-10 The Procter & Gamble Company Method of adjusting a process output value
US7092781B2 (en) * 2004-12-10 2006-08-15 The Procter & Gamble Company Method of controlling tension in a web
US20080245495A1 (en) * 2005-05-11 2008-10-09 Hans Hogberg Apparatus for Measuring Tension in a Paper Web
US20060289692A1 (en) * 2005-06-24 2006-12-28 Horneck Craig F Apparatus for winding paper with static control
US20070095495A1 (en) * 2005-10-28 2007-05-03 Jorg Reuter Method and apparatus for producing a fibrous web
US20070151689A1 (en) * 2005-12-29 2007-07-05 Honeywell Asca, Inc. Machine direction sensor system with cross direction averaging
US20070151690A1 (en) * 2005-12-30 2007-07-05 Machattie Ross K Cross-machine direction actuators for machine clothing
US20070169906A1 (en) * 2006-01-26 2007-07-26 Rudolf Munch Method for producing or treating a fibrous web

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160031685A1 (en) * 2013-04-17 2016-02-04 Parkburn Precision Handling Systems Limited Load bearing apparatus and method
US9850112B2 (en) * 2013-04-17 2017-12-26 Parkburn Precision Handling Systems Limited Load bearing apparatus and method

Also Published As

Publication number Publication date
EP1785527A2 (de) 2007-05-16
EP1785526A2 (de) 2007-05-16
EP1785526A3 (de) 2007-11-14
EP1785527A3 (de) 2007-11-14
DE102005054825A1 (de) 2007-05-24

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AS Assignment

Owner name: VOITH PATENT GMBH,GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SCHMACHTEL, RAINER, DR.;KOSTER, SOREN, DR.;MUNCH, RUDOLF;REEL/FRAME:018843/0482

Effective date: 20070104

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION