EP0575371B1 - Procede pour l'elimination de defauts de planeite lors de la fabrication de bandes continues, en particulier dans des machines a cartonnage, et dispositif pour la realisation dudit procede - Google Patents

Procede pour l'elimination de defauts de planeite lors de la fabrication de bandes continues, en particulier dans des machines a cartonnage, et dispositif pour la realisation dudit procede Download PDF

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Publication number
EP0575371B1
EP0575371B1 EP92905566A EP92905566A EP0575371B1 EP 0575371 B1 EP0575371 B1 EP 0575371B1 EP 92905566 A EP92905566 A EP 92905566A EP 92905566 A EP92905566 A EP 92905566A EP 0575371 B1 EP0575371 B1 EP 0575371B1
Authority
EP
European Patent Office
Prior art keywords
web
round bar
guide element
cardboard
flatness
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.)
Expired - Lifetime
Application number
EP92905566A
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German (de)
English (en)
Other versions
EP0575371A1 (fr
Inventor
Manfred Stemmer
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.)
Stora Feldmuehle AG
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Stora Feldmuehle AG
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 Stora Feldmuehle AG filed Critical Stora Feldmuehle AG
Publication of EP0575371A1 publication Critical patent/EP0575371A1/fr
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Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/12—Controlling movement, tension or position of material

Definitions

  • the present invention relates to a method according to the preamble of claim 1, and device for its implementation with a crusher bar arranged in the machine frame, oriented transversely to the machine direction and movably mounted perpendicularly thereto.
  • a carton could only be produced without any significant curvature if its mechanical properties and its moisture expansion behavior would be symmetrical with respect to its neutral plane.
  • this cannot be assumed in practice if almost 100% waste paper is used in cardboard production.
  • a cardboard box made from waste paper with a top layer, intermediate layer and underlay and possibly a single or multiple stroke application has considered the cross-section of the cardboard, such an inhomogeneous material composition that a pronounced curl is unavoidable.
  • the maximum curvature of the long side is measured from an A4 sheet.
  • a disadvantage when the post-drying group of a board machine is heated differently is that the performance of the machine is reduced due to the theoretical drying capacity which cannot be used.
  • the determined laboratory curvature specifies the ratio in which the vapor pressure of the upper drying cylinders to that below the drying cylinders in the after-dryer group should be set. For a given final moisture content of the web, the reduction in the total drying capacity of the after-drying group follows from the required adjustment range of the steam pressure of the drying cylinders.
  • a very different heating of the drying cylinders also leads to Wrinkling of the cardboard web with frequent tearing due to folded web edges, especially in the inlet of a coating system operated in the ON-LINE.
  • DE-PS 132 241 relates to a method and device with which the curling of papers coated on one side is to be prevented by breaking the coherent coating layer into small individual areas.
  • the reason for the curling is the shortening of the surface of the coating color after drying.
  • the coating layer is broken down into small individual areas by rolling with a transverse and longitudinal corrugation or by pulling the paper over rounded edges.
  • a disadvantage of the proposed method is that only papers with a brittle line application, which after drying can be broken down into small individual areas by appropriate treatment, can be used. Such a massive longitudinal and transverse breaking has a disadvantageous effect on the stiffness of the paper, so that after the treatment there is a lobed paper with low stiffness.
  • the method proposed here cannot be used with cardboard, especially with cardboard that is smooth on one side or coated cardboard, since the corrugating rollers damage the surface or top of the cardboard by permanently affecting the smoothness and gloss that was generated there, so that the cardboard in particular with so-called chromo replacement or chromo cardboard completely loses its use value.
  • the curvature in the running direction of the web can be changed, for example, by inserting breaker bars, as are known from German utility model 87 13 445, within a cross cutter. This makes it possible to correct faulty paper rolls.
  • the breaker effect ie the reduction of tension on one side of the web, is achieved by pulling the web under tension over the sliding surface of the breaker bar provided with a small radius.
  • the immersion depth of the breaker bar is perpendicular to the direction of web travel and is determined according to the particular one Laboratory curvature controlled.
  • the working principle of the breaker bar known from DE-GM 87 13 445 is unsuitable for use in the online operation of a board machine. Disadvantages arise from the large amount of heat generated on the sliding surface, the increased wear on the sliding surfaces and the abrasion of the underside of the carton with corresponding dusting.
  • the object of the invention is to provide a method which continuously influences the actual curvature value in order to eliminate flatness problems in the manufacture of webs, in particular in board machines with web speeds common today, for example a web speed of 450 m / min . at a basis weight of the cardboard of 220 g / m2, whereby once a "target laboratory curvature" can be independently kept stable with a control over a period of several hours and the drying performance of the drying group can only be used for web drying and that furthermore, there is no loss of bending stiffness of the web material due to the method.
  • Another object of the invention is to improve a device known as a breaker bar for mechanically eliminating flatness disturbances in such a way that the device can be operated without problems in the board machine and a possible dust development of the web is largely avoided or the resulting dust can be removed immediately .
  • the present invention proposes to achieve the object in a method according to the preamble of claim 1 that a guide element shaped as a round rod and rotated by means of a rotary drive acts on the underside of the web perpendicularly to the direction of web travel, in such a way that for regulating the Flatness of a cardboard web, the manipulated variable for the immersion depth of the guide element in the underside of the web is derived from the difference of the continuously or intermittently measured surface moisture of the current top and bottom of the web, so that when the surface moisture difference changes, the immersion depth of the guide element, which is indicated by position indicators, is adjusted accordingly becomes.
  • the combination of the features according to the invention results in a control loop, the difference between the surface moisture of the ceiling and the base, for example of a cardboard box, serving as the control actual value.
  • the actuator here is a guide element acting on the underside of the web which, with two guide rollers of relatively large diameter, causes the web to change direction three times, ie the wrap angle of the web increases approximately proportionally to the immersion depth of the guide element due to the geometry.
  • a mechanical actuator is thus available, with which the actual curvature value can be changed under constant conditions without having to take any special measures, for example during drying.
  • the surface moisture difference that changes during the production process specifies how far the current immersion depth of the guide element indicated by the position indicator must be changed in order to finally bring about the required change in curvature.
  • the new immersion depth of the guide element can be controlled manually, for which a visual indication of the immersion depth is then sufficient as a position indicator.
  • the guide element is preferably positioned automatically, for which purpose a position sensor, for example an inductive position sensor, is then required as a position detector for monitoring and reporting back the current immersion depth of the guide element.
  • the performance capacity of a board machine could be increased by up to 10% without the curvature determined on the reel samples deviating from the specified quality tolerance range.
  • a wrap angle of the web achieved by the immersion depth of the guide element over the guide element up to 60 degrees has no influence on the bending stiffness required for the cardboard, as shown in Example 2 below for differently heavy cardboard materials.
  • the guide element rotate in the direction of web travel or in opposite directions, the peripheral speed of the guide element being chosen to be less than 1% of the web speed.
  • the rotation of the guide element reduces the friction and prevents tearing out of track components, which can lead to the dreaded dusting.
  • one-sided wear of the same is prevented by the rotation of the guide element.
  • the guide element is cooled.
  • the guide element can be cooled by means of water or air.
  • the infrared reflection sensor measurement which is independent of a basis weight measurement, has proven to be particularly suitable for the precise measurement of the surface moisture. This is done using a multifilter technique used that uses additional wavelength ranges and evaluates the absorption of the pulp-specific resonance frequency, so that the sensor measures water weight and fiber weight at the same time.
  • the measurement enables a direct display with a measuring range of 0 - 40% for the absolute moisture content. From about 80 to 100 g / m2 paper weight, only the surface moisture is measured.
  • the sensors are arranged opposite each other above and below the web.
  • a device for carrying out the method according to the invention is specified in claim 6 and preferred embodiments are specified in subclaims 7 to 11.
  • a breaker bar is arranged between two guide rollers spaced apart from one another, which serve to support the passing web.
  • the breaker bar has a round rod provided with a rotary drive and can be moved with the round rod first into the intermediate space, which is formed by two guide rollers spaced apart from one another.
  • means are provided for repetitively setting positions perpendicular to the running direction of the web.
  • the two guide rollers interacting with the breaker bar are advantageously arranged so that the web guide does not change before and after the guide rollers, regardless of which position the Breaker bar takes between the guide rollers.
  • the web surface to be printed, which is supported against the guide rollers, is protected in that the peripheral speed of the guide rollers is synchronized with the web speed by means of its own drive.
  • the center distance of the two guide rollers is at least 1.2 times larger than their outer diameter.
  • the diameter of the round rod is at least 40 times smaller than the diameter of the guide rollers.
  • the breaker bar has a slidable material manufactured receptacle for supporting and guiding the round rod.
  • the receptacle which preferably extends over the entire width of the web, supports the round rod rotating in it evenly without the round rod being able to bend.
  • a further embodiment of the invention has in the longitudinal direction in the bottom of the receptacle, that is to say across the entire web width, a groove which is provided at its ends with at least one cooling water supply and discharge channel.
  • the rotating round bar rests on the groove and is constantly wetted by the cooling water that passes through the groove. At the same time, particles adhering to the round rod and torn from the web are removed.
  • the starting material was a 3-layer cardboard box made from waste paper with a 3-layer top layer.
  • the cardboard web had the following measured values in the cardboard machine before winding on: Web width: 3.65 m Web speed: 450 m / min Basis weight including stroke: 220 g / m2 Total humidity: 8.5 to 9% Surface damp ceiling: 9.4% Surface damp underlay: 6.6%
  • the measured absolute moisture content of the cardboard web corresponds to the respective mean values, which were taken from the measuring positions, driver's side, middle and drive side on the cardboard machine.
  • the board machine produced at almost max. Drying performance, with the setting of the steam pressures of the upper drying cylinders to the lower drying cylinders at 3.5 bar almost the same and at a high level.
  • the curvature could be kept stable over a period of more than 3 hours.
  • moisture-independent influences on the curvature are caused by changes in the setpoint value of the control loop, i.e. Adjustment of the average surface moisture difference in relation to the immersion depth T, compensated at intervals of 2 to 3 hours.
  • Example 2 Experiments with the device mentioned in Example 1, as shown in FIG. 1, did not result in any noteworthy Changes in the bending stiffness of the tested sheet materials up to an immersion depth of 15 cm.
  • the web materials examined were single and multi-layer cartons from 230 to 425 g / m2.
  • the diagram shows the influence of the bending stiffness of the sheet materials, expressed as the geometric mean of the root from longitudinal and transverse measurement ⁇ (L xq), on the immersion depth of the round bar.
  • FIG. 4 shows schematically the guidance of the cardboard web (9) from the winding system (21) of a cardboard machine.
  • a surface moisture measuring device with an infrared reflection sensor (7) for the ceiling and another infrared reflection sensor (8) for the underside of the cardboard web (9).
  • These sensors are installed in a measuring frame (22), which may be equipped with a traversing device, preferably with further sensors, as are common today in the quality control system.
  • FIG. 4 On the right-hand side of FIG. 4 is the device for mechanically correcting flatness faults arranged in the machine frame (1).
  • the breaker bar (3) which is displaceably mounted by linear guides (28) perpendicular to the web running direction (2), is shown in two positions.
  • the lower, dash-dotted position shows with the lifting cylinder (12) completely lowered that the cardboard web (9) has no contact with the breaker bar (3) and the guide rollers (5; 6).
  • the second position corresponds to a possible position of the breaker bar (3) with the immersion depth T, the cardboard web (9) being subject to a three-fold change in direction.
  • the guide rollers (5; 6) have, for example, an outer diameter D of 500 mm and their center distance is 640 mm. This results in a narrow space (10) in which the breaker bar (3) can be moved into the center.
  • the wrap angle (2 x ⁇ ) of the cardboard web (9) over the breaker bar (3) increases approximately proportionally with increasing immersion depth T, as shown in FIG. 3, where ⁇ is the run-off angle of the cardboard web (9) from the guide roller (6) to the web running direction (2 ) indicates.
  • the measurement signal processing takes place in the transmission element (Ü).
  • the connections of the signal transmission are shown by dashed lines.
  • the difference value x e1 determined from the surface moisture measurement of the infrared reflection sensors (7; 8) gives the control actual value.
  • the in the transmission link (Ü) by non-moisture-dependent Z i disturbances adjusted and the deviation from the desired curvature laboratory in correlation with x e1 derived manipulated variable x a1 results in the adjusted immersion depth T of the breaker strip (3).
  • the current position x e2 of the breaker bar (3) is indicated by the position indicator (11).
  • the two guide rollers (5; 6) each have a drive (20) rotating synchronously with the web speed, so that there is no line damage on the cover of the cardboard web (9).
  • Figures 5 and 6 show the upper part of the crusher bar (3) over the working width (AB) of the board machine with the round bar (4) mounted on it and coupled by means of a rotary drive (13).
  • the round bar (4) has a diameter d of 10 mm, ie 50 times smaller than the diameter D of the opposite guide rollers (5; 6).
  • the receptacle (14) made of cast iron, for example, guides the round rod (4) in a 10 mm wide and 5 mm deep groove produced by milling or broaching.
  • a second groove (17) with a width and depth of 5 mm is made in the middle of the bottom of the groove.
  • the hard chrome-plated and polished round bar (4) is supported on the slightly broken or rounded edges (24) of the groove (17) and is supported on the end faces of the receptacle (14) by a known fixed bearing (15) and floating bearing (16 ) held, which simultaneously seal the receptacle on the front.
  • the groove (17) introduced on the groove bottom serves to cool the round rod (4) in which cold well water is at 15 ° C. on the
  • the driver side is fed through channel (18) and extracted on the drive side through channel (19). The suction of the cooling water prevents the duct (19) from becoming blocked by stripped fibers.
  • the cooling water can be supplied and removed at the ends by rotating unions.
  • the rotary drive of the round rod (25) must then be arranged laterally and the round rod (25) is driven, for example, by means of a toothed belt drive.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • General Factory Administration (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Details Of Cutting Devices (AREA)

Claims (11)

  1. Procédé pour éliminer les défauts de planéité lors de la fabrication de bandes continues dans des machines à cartonnages, en particulier lors de la fabrication de bandes continues de carton de grammage supérieur à 200 g/m², un élément de guidage qui est placé en amont du dispositif de bobinage et transversalement à la direction de marche de la bande provoquant, en relation avec deux cylindres de guidage espacés l'un de l'autre qui sont placés en amont et en aval de l'élément de guidage, vu dans la direction de marche de la bande, un triple changement de direction de la bande continue, caractérisé par le fait qu'un élément de guidage qui est agencé sous forme de barreau circulaire et est mis en rotation par un mécanisme d'entraînement agit sur la face inférieure de la bande continue, perpendiculairement à la direction de marche de celle-ci, que pour régler la planéité de la bande continue de carton on détermine la grandeur de réglage pour la pénétration de l'élément de guidage dans la face inférieure de la bande à partir de la différence entre l'humidité superficielle, mesurée en continu ou de manière intermittente, de la face supérieure et de la face inférieure de la bande de telle sorte que la pénétration de l'élément de guidage mesurée par des détecteurs de position soit modifiée lorsque la différence d'humidité superficielle varie.
  2. Procédé selon la revendication 1, caractérisé par le fait que l'élément de guidage tourne dans le sens de la marche de la bande ou à contre-sens de celle-ci avec une vitesse périphérique < 1 % de la vitesse de marche de la bande.
  3. Procédé selon l'une des revendications 1 et 2, caractérisé par le fait que l'élément de guidage est refroidi.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que la mesure de l'humidité superficielle est opérée au moyen de deux détecteurs à infrarouge par réflexion disposés en vis-à-vis.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que l'on surveille la pénétration de l'élément de guidage au moyen de capteurs de course.
  6. Dispositif pour éliminer mécaniquement des défauts de planéité dans des machines à cartonnages, comportant un élément de cambrage (3) qui est disposé dans le bâti (1) de la machine, transversalement à la direction de marche avec possibilité de déplacement perpendiculairement à celle-ci, un barreau circulaire (4) de faible diamètre qui est monté tournant dans ledit élément de cambrage et sert de surface de glissement, caractérisé par le fait que l'élément de cambrage (3) est disposé entre deux cylindres de guidage (5, 6) espacés l'un de l'autre qui supportent la bande en marche et par le fait que la règle (3) peut être déplacée, barreau circulaire (4, 25) en premier, dans l'espace (10) entre les cylindres de guidage (5, 6), la règle (3) présentant des moyens (11) permettant de régler de manière reproductible des positions perpendiculairement à la direction de marche de la bande (9) et par le fait que le barreau (4, 25) circulaire est pourvu d'un mécanisme d'entraînement en rotation (13) qui met le barreau (4, 25) circulaire en rotation lors du contact avec la bande.
  7. Dispositif selon la revendication 7, caractérisé par le fait que le barreau circulaire (4, 25) a un diamètre d qui est au moins 40 fois inférieur au diamètre D d'un des cylindres de guidage (5,6) en vis-à-vis.
  8. Dispositif selon l'une de revendications 6 et 7, caractérisé par le fait que l'élément de cambrage (3) présente un support (14) en un matériau présentant de bonnes caractéristiques de glissement qui est destiné à supporter et à guider le barreau circulaire (4, 25) et par le fait que le barreau circulaire (4, 25) est tenu au niveau des faces frontales de l'élément de cambrage par des paliers connus en eux-mêmes.
  9. Dispositif selon l'une des revendications 6 à 8, caractérisé par le fait qu'une rainure (17) pourvue de canaux d'entrée et de canaux de sortie (18, 19) d'eau de refroidissement est disposée dans le fond du support (14), dans la direction longitudinale de celui-ci.
  10. Dispositif selon l'une des revendications 6 à 8, caractérisé par le fait que le barreau circulaire (25) est un tube à paroi épaisse et est pourvu à ses extrémités de raccords tournants qui sont connectés à un circuit d'eau de refroidissement.
  11. Dispositif selon l'une des revendications 6 à 10, caractérisé par le fait que la surface du barreau circulaire (4, 25) est chromée dur et polie.
EP92905566A 1991-03-13 1992-02-29 Procede pour l'elimination de defauts de planeite lors de la fabrication de bandes continues, en particulier dans des machines a cartonnage, et dispositif pour la realisation dudit procede Expired - Lifetime EP0575371B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4108056 1991-03-13
DE4108056A DE4108056A1 (de) 1991-03-13 1991-03-13 Verfahren zur behebung von planlagestoerungen bei der herstellung von bahnen in papier- oder kartonmaschinen und vorrichtung zu seiner durchfuehrung
PCT/EP1992/000443 WO1992016690A1 (fr) 1991-03-13 1992-02-29 Procede pour l'elimination de defauts de planeite lors de la fabrication de bandes continues, en particulier dans des machines a cartonnage, et dispositif pour la realisation dudit procede

Publications (2)

Publication Number Publication Date
EP0575371A1 EP0575371A1 (fr) 1993-12-29
EP0575371B1 true EP0575371B1 (fr) 1995-07-12

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EP92905566A Expired - Lifetime EP0575371B1 (fr) 1991-03-13 1992-02-29 Procede pour l'elimination de defauts de planeite lors de la fabrication de bandes continues, en particulier dans des machines a cartonnage, et dispositif pour la realisation dudit procede

Country Status (5)

Country Link
EP (1) EP0575371B1 (fr)
AT (1) ATE125014T1 (fr)
DE (2) DE4108056A1 (fr)
ES (1) ES2074880T3 (fr)
WO (1) WO1992016690A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009022248A1 (de) 2009-05-20 2010-12-09 E.C.H. Will Gmbh Entwölbungsvorrichtung zur Entwölbung einer Materialbahn, insbesondere in einer Anlage der papierverarbeitenden Industrie

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19844927A1 (de) * 1998-09-30 2000-04-06 Voith Sulzer Papiertech Patent Meßsystem
DE10127840A1 (de) * 2001-06-08 2002-12-12 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur Messung von innerhalb einer Materialbahn auftretenden Spannungen
CN103086179B (zh) * 2013-01-29 2015-09-16 麦斯科林（无锡）科技有限公司 一种布料展平装置
CN105645160B (zh) * 2016-03-10 2017-07-18 深圳市鑫三力自动化设备有限公司 一种适用于深腔玻璃缓冲材导向结构及其导向方法

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Publication number Priority date Publication date Assignee Title
DE132241C (fr) *
US1987670A (en) * 1933-05-11 1935-01-15 Westinghouse Electric & Mfg Co Braking generator for use with calender
DE3614713A1 (de) * 1986-04-30 1987-11-05 Babcock Textilmasch Vorrichtung zur regelung der waermezufuhr bei laufenden warenbahnen
DE8713445U1 (de) * 1987-10-07 1988-02-18 Steffen & Bergmann Konstruktionstechnik oHG, 32139 Spenge Brecherleiste für Papierverarbeitungsmaschinen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009022248A1 (de) 2009-05-20 2010-12-09 E.C.H. Will Gmbh Entwölbungsvorrichtung zur Entwölbung einer Materialbahn, insbesondere in einer Anlage der papierverarbeitenden Industrie

Also Published As

Publication number Publication date
WO1992016690A1 (fr) 1992-10-01
DE59202877D1 (de) 1995-08-17
DE4108056A1 (de) 1992-09-17
EP0575371A1 (fr) 1993-12-29
ES2074880T3 (es) 1995-09-16
ATE125014T1 (de) 1995-07-15

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