EP1353008A1 - Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage - Google Patents

Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage Download PDF

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Publication number
EP1353008A1
EP1353008A1 EP02004783A EP02004783A EP1353008A1 EP 1353008 A1 EP1353008 A1 EP 1353008A1 EP 02004783 A EP02004783 A EP 02004783A EP 02004783 A EP02004783 A EP 02004783A EP 1353008 A1 EP1353008 A1 EP 1353008A1
Authority
EP
European Patent Office
Prior art keywords
machine
clothing
accordance
hardness
compactness
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.)
Ceased
Application number
EP02004783A
Other languages
German (de)
English (en)
Inventor
Raymond P. Shead
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Priority to EP02004783A priority Critical patent/EP1353008A1/fr
Priority to AT02019399T priority patent/ATE346187T1/de
Priority to DE60216226T priority patent/DE60216226T2/de
Priority to EP02019399A priority patent/EP1342839B1/fr
Priority to US10/375,468 priority patent/US6929716B2/en
Priority to CA002421093A priority patent/CA2421093A1/fr
Publication of EP1353008A1 publication Critical patent/EP1353008A1/fr
Ceased legal-status Critical Current

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Classifications

    • 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
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/32—Washing wire-cloths or felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/06—Means for regulating the pressure
    • 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

Definitions

  • the invention relates to a method for the manufacture or treatment of a material web, in particular of a paper or cardboard web, while using a respective machine, in particular a paper machine.
  • a method of this kind is described, for example, in US-A-5 611 893 and DE 691 29 788 T2.
  • the invention further relates to an apparatus for measuring the hardness and/or the compactness of at least one clothing, in particular of at least one felt, fabric, belt and/or the like, of a machine, in particular of a paper machine, for the manufacture or treatment of a material web, in particular of a paper or cardboard web.
  • this object is satisfied by the provision of a method for the manufacture or treatment of a material web, in particular of a paper or cardboard web, while using a respective machine, in particular a paper machine, comprising the step of measuring the hardness and/or the compactness of at least one clothing, in particular of at least one felt, fabric, belt and/or the like, of said machine.
  • the hardness and/or the compactness of said machine clothing is continuously measured.
  • the measurement of the hardness and/or the compactness of said machine clothing are carried out in machine direction and/or in cross machine direction.
  • an online measurement of the hardness and/or the compactness of said machine clothing is carried out.
  • the measurement of the hardness and/or the compactness of said machine clothing can, e.g., be carried out in at least one of the following sections of the machine: forming section, pressing section, drying section.
  • a hardness and/or compactness control of said machine clothing is carried out.
  • the measurement values obtained by said measurement of the hardness and/or the compactness of that machine clothing are used for optimizing the nip profile of at least one press section.
  • the measurement values obtained by said measurement of the hardness and/or the compactness of said machine clothing can be used for monitoring the life and/or condition of said machine clothing and as an indicator for their replacement.
  • the measurement values obtained by said measurement of the hardness and/or the compactness of said machine clothing can be used for optimizing the use of cleaning showers in order to minimise compaction and extend clothing life.
  • the measurement values obtained by said measurement of the hardness and/or the compactness of said machine clothing can be used for a high-frequency analysis of said machine clothing and/or associated rotating machine elements which affect clothing compaction.
  • the measurement values obtained by that measurement of the hardness and/or the compactness of said machine clothing are used for controlling the condition of that machine clothing.
  • Such a control of the condition of said machine clothing can, for example, be carried out by controlling at least one sectionalized nip profiling and/or crown profiling equipment in order to optimize cross direction clothing compaction, nip impression and/or cross-machine web quality.
  • control of the condition of that machine clothing is carried out by controlling the average load pressure of a nip in order to optimize the pressing deficiency clothing compaction and extend the life of the machine clothing.
  • the above-mentioned object is further satisfied by the provision of an apparatus for measuring the hardness and/or the compactness of at least one clothing, in particular of at least one felt, fabric, belt and/or the like, of a machine, in particular of a paper machine, for the manufacture or treatment of a material web, in particular of a paper or cardboard web, in particular for carrying out the method in accordance with any one of the preceding claims, said apparatus comprising at least one rotating wheel which contacts said machine clothing at its region of rotation around a counter roll, and at least one hardness and/or compactness sensor associated with said rotating wheel or with said counter roll.
  • the sensor is preferably embedded in said rotating wheel or counter roll, respectively.
  • a plurality of sensors can be embedded in the counter roll in cross machine direction.
  • the rotating wheel is displaceable in cross machine direction.
  • the rotating wheel is preferably displaceable along a support rail.
  • the senor is laid out for providing a signal which is proportional to the hardness and/or compaction of said machine clothing.
  • the sensor can, e.g., be a piezo crystal sensor.
  • a contacting caliper sensor In some cases it might be expedient to use a contacting caliper sensor.
  • the sensor is preferably positioned by means of a pressure controlled apparatus.
  • the apparatus can provide continues machine direction and cross machine measurement of the hardness of paper machine clothing often referred to as felts, fabrics and belts.
  • the apparatus may consist of a rotating wheel which contacts the paper machine clothing at its point of rotation around a turn roller or counter roll.
  • the contacting roller may contain an embedded hardness sensor, or a plurality of sensors, which provide a signal which is proportional to the hardness or compaction of the paper machine clothing.
  • the apparatus may be able to provide the following information to the user:
  • the present invention provides direct measurement of clothing compaction and is able to be used as a continuous online analysis and troubleshooting tool in paper machine form sections, pressing operations and drying sections.
  • the measurement signal could, for example, be transmitted down a scanner power track and processed in an off-sheet electronics box, i.e. a so called NIC (network intelligent controller).
  • NIC network intelligent controller
  • Felts should have a certain compactness value to be successful in any given press position. Consequently, felt data could be archived such that the machine operators could access this information remotely and use it to provide customer support and competitive felt analysis.
  • the CD (cross direction) felt compactness profile will most certainly reflect the press nip profile.
  • the aim could be to have a flat compactness profile in order to deliver uniform dewatering across the web.
  • the nip profiling system could be used to flatten the compactness profile. It could also be interesting to adjust the nip load and observe felt compactness and express moisture value.
  • a control strategy could be realized which provides maximum dewatering with minimum press load while extending felt life.
  • closed loop control could be applied using the compactness profile with the nip controlled zones.
  • Figure 1 shows an apparatus 10, in a schematic illustration, for measuring the hardness and/or the compactness of at least one clothing 12, in particular of at least one felt, fabric, belt and/or the like, of a machine, in particular of a paper machine, for the manufacture or treatment of a material web, in particular of a paper or card board web.
  • the apparatus 10 comprises a rotating wheel 14 which contacts said machine clothing 12 at its point of rotation around a counter or turn roll 16.
  • At least one embedded hardness and/or compactness detection sensor 18 is mounted in the rotating wheel 14. Such a hardness and/or compactness sensor could also be embedded in the counter roll 16. In the latter case, a plurality of sensors 18 could be embedded in the counter roll 16 in cross machine direction.
  • the rotating wheel 14 is displaceable in a cross machine direction. With the present embodiment, the rotating wheel 14 is displaceable along a support rail 20.
  • Figure 2 shows a part illustration of the rotating wheel 14 of figure 1 in a larger scale.
  • the radius profile for the rotating wheel 14 is indicated at 22.
  • the sensor 14 can be laid out for providing a signal which is proportional to the hardness and/or compaction of the machine clothing 12.
  • the sensor 14 can be, for example, a piezo crystal sensor. In some cases it is might be possible to use a contacting caliper sensor.
  • the sensor 14 can be positioned, for example, by means of at least one pressure cylinder, in particular at least one light air pressure cylinder.
  • the apparatus 10 provides continuous machine direction (MD) and cross machine (CD) measurement of the hardness of paper machine clothing 12 often referred to as felts, fabrics and belts.
  • MD machine direction
  • CD cross machine
  • One or a plurality of hardness and/or compactness sensors 18 can be embedded in the rotating wheel 14 or the counter roll 16, respectively.
  • the signal provided by a respective sensor 14 can be proportional to the hardness or compaction of the machine clothing 12.
  • the apparatus 10 can, for example, be used on machine measurement for the condition of clothing in terms of machine direction (MD) and cross direction (CD) compaction (and/or hardness).
  • MD machine direction
  • CD cross direction
  • the information obtained by the at least one sensor 14 can be used to:
  • the obtained sensor signals can further be used for controlling the condition of machine closing through:
  • the apparatus 10 can generally be used as an analysis tool for the products to be manufactured.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
EP02004783A 2002-03-01 2002-03-01 Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage Ceased EP1353008A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP02004783A EP1353008A1 (fr) 2002-03-01 2002-03-01 Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage
AT02019399T ATE346187T1 (de) 2002-03-01 2002-08-30 Verfahren und vorrichtung zur messung der härte oder verdichtung einer bespannung
DE60216226T DE60216226T2 (de) 2002-03-01 2002-08-30 Verfahren und Vorrichtung zur Messung der Härte oder Verdichtung einer Bespannung
EP02019399A EP1342839B1 (fr) 2002-03-01 2002-08-30 Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage
US10/375,468 US6929716B2 (en) 2002-03-01 2003-02-27 Method for the manufacture or treatment of a material web
CA002421093A CA2421093A1 (fr) 2002-03-01 2003-02-28 Methode de fabrication ou de traitement d'une feuille de materiau

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02004783A EP1353008A1 (fr) 2002-03-01 2002-03-01 Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage

Publications (1)

Publication Number Publication Date
EP1353008A1 true EP1353008A1 (fr) 2003-10-15

Family

ID=28051725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02004783A Ceased EP1353008A1 (fr) 2002-03-01 2002-03-01 Procédé et dispositif de mesure de la dureté ou de la compactage d'un habillage

Country Status (3)

Country Link
EP (1) EP1353008A1 (fr)
AT (1) ATE346187T1 (fr)
DE (1) DE60216226T2 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024205A1 (fr) * 1979-08-16 1981-02-25 Albany International Corp. Appareil et procédé pour maintenir la perméabilité des feutres dans les machines à fabriquer le papier et le carton
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
WO1991013337A1 (fr) * 1990-03-01 1991-09-05 Beloit Corporation Procede et appareil de mesure d'irregularites et de durete d'une surface de rouleau
WO1996003616A1 (fr) * 1994-07-21 1996-02-08 Wangner Systems Corporation Dispositif et procede servant a effectuer la mesure sans contact de l'epaisseur d'une toile de fabrication de papier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0024205A1 (fr) * 1979-08-16 1981-02-25 Albany International Corp. Appareil et procédé pour maintenir la perméabilité des feutres dans les machines à fabriquer le papier et le carton
EP0298057A2 (fr) * 1987-02-23 1989-01-04 Valmet Paper Machinery Inc. Méthode et dispositif de contrôle d'un rouleau à zones
WO1991013337A1 (fr) * 1990-03-01 1991-09-05 Beloit Corporation Procede et appareil de mesure d'irregularites et de durete d'une surface de rouleau
WO1996003616A1 (fr) * 1994-07-21 1996-02-08 Wangner Systems Corporation Dispositif et procede servant a effectuer la mesure sans contact de l'epaisseur d'une toile de fabrication de papier

Also Published As

Publication number Publication date
DE60216226D1 (de) 2007-01-04
DE60216226T2 (de) 2007-09-13
ATE346187T1 (de) 2006-12-15

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