WO2008028516A1 - Procédé et dispositif pour mesure de condition de ligne de contact - Google Patents

Procédé et dispositif pour mesure de condition de ligne de contact Download PDF

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Publication number
WO2008028516A1
WO2008028516A1 PCT/EP2006/066025 EP2006066025W WO2008028516A1 WO 2008028516 A1 WO2008028516 A1 WO 2008028516A1 EP 2006066025 W EP2006066025 W EP 2006066025W WO 2008028516 A1 WO2008028516 A1 WO 2008028516A1
Authority
WO
WIPO (PCT)
Prior art keywords
nip
rollers
measuring
roller
measured
Prior art date
Application number
PCT/EP2006/066025
Other languages
English (en)
Inventor
Wayne Boga
Original Assignee
Metso Paper, 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 Metso Paper, Inc. filed Critical Metso Paper, Inc.
Priority to PCT/EP2006/066025 priority Critical patent/WO2008028516A1/fr
Publication of WO2008028516A1 publication Critical patent/WO2008028516A1/fr

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0072—Devices for measuring the pressure between cylinders or bearer rings
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/002—Opening or closing mechanisms; Regulating the pressure
    • D21G1/004—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
    • D21G9/0036—Paper-making control systems controlling the press or drying section
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/0061—Force sensors associated with industrial machines or actuators
    • G01L5/0076—Force sensors associated with manufacturing machines
    • G01L5/0085—Force sensors adapted for insertion between cooperating machine elements, e.g. for measuring the nip force between rollers

Definitions

  • the invention relates to a method of measuring a condition in a nip between two rollers which are in elastic nip contact, and relates to a device for carrying out that method.
  • the invention is applicable to a paper making machine, board making machine, paper finishing machine or printing machine.
  • rollers are commonly used which form a soft nip. At least one of the two contacting rollers forming the nip there between by press contact is a so- called soft roller which has an elastically deformable jacket. Usually, such soft rollers have a hard (metal) core with an elastomeric cover thereon.
  • the success of treatment of a web by passing it through the nip is in many cases directly related to the conditions in the nip. In order to obtain e.g. homogenous treatment of wide webs, there is big interest that nip conditions are the same or constant all over the length of the nip. Nip conditions may be controlled by several measures, however, suitable control requires a detection or measurement of the nip conditions.
  • the load which may be applied is limited, since polymer covered rollers are used. With these rollers, overload of the polymer covering of the rollers may cause local destruction of the polymer. Accordingly, in order to ensure the integrity of the polymer covers on the metal roll bodies, it is necessary to ensure that an even load is applied to the rollers in the nip; in particular load peaks in both the axial direction and the circumferential direction of the rollers have to be avoided.
  • rollers are loaded against each other with forces which cause an actual and significant deformation of the polymeric cover, so that the nip is not a mere line contact, but is a contact area having a certain nip width.
  • a typical method used to measure this contact area is a stationary method, and involves introduction of a sandwich of plain paper and carbon paper into the nip, then bringing the rollers together under operation load in stationary condition, that is the rollers are not turning. With this arrangement, rollers are left loaded against each other for a certain period of time and are then released so that the carbon paper and the plain paper can be removed from the nip.
  • the carbon impression on the plain paper under load in the nip allows conclusions on the nip contact area or nip width, also allowing conclusions regarding nip pressure distribution.
  • the invention proposes a method according to claim 1, and a device for carrying out that method according to claim 9.
  • the difference of peripheral speeds of the two rollers is measured and the nip conditions are derived from the measured peripheral speed difference. It is noted that with this arrangement, the stationary material creeping problem can be completely solved, and the rotational speed of the rollers may even reach normal operating conditions of the rollers. Thus, nip conditions between rollers operating under normal operation conditions can be measured.
  • a typical roller has an elastically deformable cover which deforms elastically under nip conditions, however, such elastic deformation is usually not an ideal elastic behaviour.
  • a visco-elastic behaviour of the elastically deformable cover allows the use of the invention.
  • the peripheral speeds are precisely measured and based on the known compression/recovery behaviour of the visco-elastic cover the nip condition can be found.
  • diameters of rollers can be very precisely measured, so that it is considered sufficient to use the once measured diameter and the angular velocity particularly of hard roller when such roller is used for forming one side the nip; however, such an approach is useable with the soft roller as well.
  • any suitable and sufficiently precise methods for measuring peripheral speeds i.e. the surface speeds of the rollers, can be used.
  • Such measuring methods may include optical measurement methods, radar methods or electromagnetic method using e.g. electromagnetic induction.
  • a measuring device for measuring a difference of peripheral speeds of two rollers which are in engagement in an elastic nip contact.
  • a device might include a tachometer or strobe for measuring angular velocity of the rollers and a measuring device for measuring roller diameters.
  • a measurement wheel which is in direct contact with the roller surface as well as devices using the above mentioned measurement methods, such as optical, radar or other surface speed measurement methods.
  • suitable marks on the roller surfaces may be optically detected and from the tuned signals and the known distance between the detected marks, the speed may be calculated.
  • Another possibility could be the electro-magnetic detection of metal parts (or magnets) embedded in the roller cover.
  • the speeds of the two rollers may also be detected by different measurement means for each roller.
  • the device may comprise a plurality of individual measuring devices which may be arranged at locations on a line parallel to an extension direction of the rotational axis of the roller. To simplify the collection of measurement data, it may also be considered to arrange the plurality of measuring devices at locations on a line extending in a direction oblique to a rotational axis of the roller, so that each measuring mark (e.g. a line in roller axial direction) passes the respective measuring device with a slight offset in time, so that it is not required to collect or obtain all measuring data at the same time but may be collected successively.
  • each measuring mark e.g. a line in roller axial direction
  • the present invention may be applied to any machine or device in which rollers are in elastic nip contact, and in which the nip condition is to be measured.
  • the nip condition may include a nip load, a nip width and a nip pressure distribution, for example.
  • nip condition measurements according to the method and device may be used to control the nip condition by controlling suitable nip condition control parameters line roller load, roller shape, roller speed or the like.
  • Fig. 1 shows a schematic arrangement of a device putting the method according to the invention into practice
  • Fig. 2 shows a detail E of Fig. 1;
  • Fig. 3 shows a schematic arrangement for measuring nip conditions along the nip
  • Fig. 4 shows results of the speed ratio vs. roll cover deformation with various cover materials.
  • a hard roller 1 and a soft roller 2 which has a hard core 22 and an elastically deformable cover or covering 21, wherein the rollers 1 and 2 are in an elastic nip contact.
  • the rollers 1 and 2 may be calender rolls in a calender.
  • the rollers are rotatably held in a support structure which allows to suitably press-contact the rollers with each other.
  • the paper web passes through at least one nip or a series of nips in the calender in which nips the surface of the paper web is smoothened. Heat and/or moisture may be applied to the web in connection with calendering.
  • Measuring devices 4 and 5 are provided with which the peripheral speed Vl and V2, respectively, of the two rollers are measured.
  • the method of measuring may include measuring of the angular velocity of each roller such as a tachometer or an optical device like a strobe which operate in conjunction with a measuring device capable of precisely measuring outer diameter of each of the rollers.
  • measurement of the surface speed of the rollers may be conducted by one or both of the speed measuring devices 4 and 5; e.g. marks on the surface can be optically detected, and, having the marks in a predetermined precise interval arranged around the circumference of the roller, the time signal of the detection can be used to calculate surface speed.
  • other optical solutions with visible or invisible light or electromagnetic detection can be used to detect the roller surface speed.
  • the so detected signals representative of the surface velocity of the rollers are input into a controller 6, where the measured signals are evaluated in a converting means for converting the measurement data to nip data providing nip conditions such as nip width, nip load, nip pressure distribution.
  • a controller 6 where the measured signals are evaluated in a converting means for converting the measurement data to nip data providing nip conditions such as nip width, nip load, nip pressure distribution.
  • suitable control of nip condition control parameters like roller loading, roller shape roller load distribution, or other control parameters influencing the nip can be set in order to obtain the desired nip condition profile in the nip.
  • the contact width (N) in the nip can be approximated by a function of the radial deformation (d r ) of the elastomeric covered rollers, which in turn can be approximated by the difference in surface speed (S R ) between the rollers. So, by association:
  • these measurements can be taken under dynamic conditions, in the covered roller operating environment and operating conditions, and at operating machine speeds, without actually introducing a measuring device into the nip contact area itself.
  • N nip width, in inches
  • T working cover thickness, in inches
  • Equation 4 is one of many derivable equations used in the papermaking industry to describe that relationship. , N 2 ⁇ D X ⁇ D 2 ) d' " AD 1 D 2 eq - [ 4 ]
  • N nip width, in inches
  • the speed ratio existing between the two rollers is related to the radial deformation of a polymeric (elastomeric) cover, hence is also related to the nip contact area.
  • the lower roller 2 has a hard core 22 and a soft covering 21.
  • the nip 3 In the area of the nip 3, there is found some bulging behaviour of the cover material as a result of the hard roller 1 pressing into the surface of the soft roller.
  • these bulging portions 23 and 24 are almost symmetric, however, one may also expect that a non- symmetric bulging occurs on the entry side of the nip rather than on the exit side of the nip (in Fig. 2 entry side bulging corresponds to ref. 24) especially, when the material has a visco-elastic behaviour.
  • the formation of the bulging can be understood as a kind of partly blocking or to dam up the passage of the softer cover material 21 through the passage formed between the hard roller 1 and the hard roller 22 core of the soft roller 2.
  • the speed difference or the surface velocity difference of the rollers which is made use of with the present invention is assumed to occur due to the reduction of diameter d r in the nip, where the deformation of the elastic material of the roller cover is maximum and, at the same time, there is the assumption that the surface velocity at this point of the rollers is identical, or very nearly identical.
  • roller covering deformation causes a certain difference in diameter as compared to the non-loaded portion of the rollers, so that there is a difference of the moving speeds of the two points P (Fig. 2) on the surface of the rollers when the roller cover has returned to the original shape.
  • Fig. 3 shows a possible arrangement of a device which may be used to measure nip conditions or nip condition profile in the nip over the roller length.
  • two rollers 1 and 2 are shown, one of which may be a hard roller and at least one of which is a soft roller.
  • Measuring devices 4 and 5 are only schematically shown which may consist of beams having an array of sensors arranged thereon, so as to measure velocity of the roller surface along a circumference line of the roller in certain points along the roller length.
  • drawing Fig. 3 is only schematic and the dash lines only indicate that there is a transfer of information indicative of the surface velocity of the roller exchanged between the roller surface and the sensor in its array.
  • dashed lines along the circumference of each roller it is indicated that the most accurate conclusion or nip conditions may be collected if the surface speeds of the two rollers are measured on congruent circumferential lines of the rollers.
  • the arrays of sensors need not be arranged in parallel to the axis of rotation of the rollers, but it may be an advantageous solution to arrange the sensors such that they are arranged on an inclined or curved line with respect to the rotational axis of the rollers.
  • the sensors supply the measured velocity signals successively during one rotation of the rollers, an arrangement which can simplify data acquisition and evaluation in the device.
  • the rollers may be rotated at any speed; preferably the intended operating speed, so that any additional speed effects stemming from centrifugal forces etc. can be automatically included in the measurements and subsequent control.
  • the roller covers are usually visco-elastic, i.e. they do not show ideal elastic behaviour so that there is also a time component involved in deformation and return to original shape.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un procédé pour mesurer la condition d'une ligne de contact (3) formée entre deux rouleaux (1, 2) dans un contact de ligne de contact élastique, comprenant la mesure de la différence de vitesses périphériques des deux rouleaux (1, 2), et la condition de ligne de contact est dérivé des vitesses périphériques mesurées. Le procédé selon l'invention concerne un cas où les rouleaux (1, 2) forment partie d'une machine à papier, une machine de finition de papier ou une machine à imprimer, et où les vitesses de rotation des rouleaux sont des vitesses opérationnelles de chacun des rouleaux (1, 2) lors du fonctionnement de la machine respective. Le dispositif selon l'invention pour mettre en œuvre le procédé comporte un dispositif de mesure pour mesurer les vitesses périphériques de chacun des rouleaux (1, 2). En particulier, le dispositif peut comporter un dispositif de mesure (4, 5) pour mesurer directement la vitesse superficielle d'un rouleau (1, 2), le dispositif pouvant comprendre une roue de mesure en contact avec la surface du rouleau, un système optique utilisant des rayons visibles ou invisibles et assurant la détection de structure de surface ou des repères sur la surface du rouleau, un système à base de radar, et/ou un système électromagnétique coopérant avec des générateurs de signaux dans le rouleau.
PCT/EP2006/066025 2006-09-05 2006-09-05 Procédé et dispositif pour mesure de condition de ligne de contact WO2008028516A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/066025 WO2008028516A1 (fr) 2006-09-05 2006-09-05 Procédé et dispositif pour mesure de condition de ligne de contact

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2006/066025 WO2008028516A1 (fr) 2006-09-05 2006-09-05 Procédé et dispositif pour mesure de condition de ligne de contact

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Publication Number Publication Date
WO2008028516A1 true WO2008028516A1 (fr) 2008-03-13

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138691A1 (fr) * 2007-05-09 2008-11-20 Voith Patent Gmbh Procédé et dispositif de commande et/ou de réglage de l'entraînement d'un système de cylindres
WO2009101251A2 (fr) * 2008-02-12 2009-08-20 Upm-Kymmene Oyj Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer
DE102008033613B3 (de) * 2008-07-17 2010-04-29 Manroland Ag Vorrichtung und Verfahren zum Bestimmen des Förderverhaltens von Übertragungszylinderaufzügen
WO2011086044A1 (fr) * 2010-01-14 2011-07-21 Windmöller & Hölscher Kg Procédé et dispositif destinés à optimiser la position relative d'au moins deux cylindres d'impression
CN103090997A (zh) * 2011-11-01 2013-05-08 常涛 一种压力测试仪
EP2930026A1 (fr) * 2014-04-10 2015-10-14 Goss International Americas, Inc. Procédé de quantification des performances d'un blanchet et presse d'impression
JP2021020340A (ja) * 2019-07-25 2021-02-18 株式会社村田製作所 グラビア印刷装置および積層セラミックコンデンサの製造方法
JP2021067470A (ja) * 2019-10-17 2021-04-30 Nok株式会社 ニップ幅測定装置
KR102422810B1 (ko) * 2021-11-18 2022-07-19 한국기계연구원 인쇄 장치 및 이의 인쇄 압력 제어 방법
WO2022174105A1 (fr) * 2021-02-12 2022-08-18 Usnr, Llc Système de surveillance/commande d'un massicot à placages rotatif

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538221A2 (fr) * 1991-10-14 1993-04-21 Valmet Paper Machinery Inc. Procédé et dispositif pour mesurer la force et/ou la pression dans un interstice formé par un rouleau tournant ou un ruban utilisé dans la production du papier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538221A2 (fr) * 1991-10-14 1993-04-21 Valmet Paper Machinery Inc. Procédé et dispositif pour mesurer la force et/ou la pression dans un interstice formé par un rouleau tournant ou un ruban utilisé dans la production du papier

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008138691A1 (fr) * 2007-05-09 2008-11-20 Voith Patent Gmbh Procédé et dispositif de commande et/ou de réglage de l'entraînement d'un système de cylindres
WO2009101251A2 (fr) * 2008-02-12 2009-08-20 Upm-Kymmene Oyj Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer
WO2009101251A3 (fr) * 2008-02-12 2009-12-03 Upm-Kymmene Oyj Procédé et dispositif pour mesurer la pression dans la pince et/ou le profil de pression dans la pince d'une unité d'impression d'une presse à imprimer
DE102008033613B3 (de) * 2008-07-17 2010-04-29 Manroland Ag Vorrichtung und Verfahren zum Bestimmen des Förderverhaltens von Übertragungszylinderaufzügen
WO2011086044A1 (fr) * 2010-01-14 2011-07-21 Windmöller & Hölscher Kg Procédé et dispositif destinés à optimiser la position relative d'au moins deux cylindres d'impression
CN103090997A (zh) * 2011-11-01 2013-05-08 常涛 一种压力测试仪
EP2930026A1 (fr) * 2014-04-10 2015-10-14 Goss International Americas, Inc. Procédé de quantification des performances d'un blanchet et presse d'impression
US9555614B2 (en) 2014-04-10 2017-01-31 Goss International Americas, Inc. Method for quantifying blanket performance and printing press
JP2021020340A (ja) * 2019-07-25 2021-02-18 株式会社村田製作所 グラビア印刷装置および積層セラミックコンデンサの製造方法
JP7156198B2 (ja) 2019-07-25 2022-10-19 株式会社村田製作所 グラビア印刷装置および積層セラミックコンデンサの製造方法
JP2021067470A (ja) * 2019-10-17 2021-04-30 Nok株式会社 ニップ幅測定装置
JP7290541B2 (ja) 2019-10-17 2023-06-13 Nok株式会社 ニップ幅測定装置
WO2022174105A1 (fr) * 2021-02-12 2022-08-18 Usnr, Llc Système de surveillance/commande d'un massicot à placages rotatif
KR102422810B1 (ko) * 2021-11-18 2022-07-19 한국기계연구원 인쇄 장치 및 이의 인쇄 압력 제어 방법

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