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WO1991018146A1 - Ameliorations relatives a la fabrication de materiaux en feuille - Google Patents

Ameliorations relatives a la fabrication de materiaux en feuille Download PDF

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Publication number
WO1991018146A1
WO1991018146A1 PCT/GB1991/000829 GB9100829W WO9118146A1 WO 1991018146 A1 WO1991018146 A1 WO 1991018146A1 GB 9100829 W GB9100829 W GB 9100829W WO 9118146 A1 WO9118146 A1 WO 9118146A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
machine
control apparatus
temperature
temperature profile
Prior art date
Application number
PCT/GB1991/000829
Other languages
English (en)
Inventor
Robert Leighton
Original Assignee
Vickerys Limited
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
Priority claimed from GB909011602A external-priority patent/GB9011602D0/en
Application filed by Vickerys Limited filed Critical Vickerys Limited
Publication of WO1991018146A1 publication Critical patent/WO1991018146A1/fr

Links

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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • This invention generally concerns the manufacture of sheet material and more particularly, though not necessarily exclusively, concerns the manufacture of non-woven sheet material and especially paper and paper-like materials such as card and board materials.
  • Pape.rmaking machines such as the well known Fourdrinier machine, work by continuously depositing an aqueous slurry of fibrous material together with additives such as fillers onto a moving woven wire belt in a thin layer.
  • the wire belt permits some of the water present in the nascent paper layer to drain away and feeds the still very wet paper between two moving endless belts of felt.
  • Some papermaking machines use a natural granite roll as the upper press roll and such a granite press roll may typically be of the order of 500 to 2000 nuns in diameter and up to 12 m long, and may .run at speeds of anything from 100 to 2000 m of paper throughout per minute.
  • Natural granite is the most favoured material for such press rolls because the mechanical properties of granite are such that a granite roll can span greater widths with minimal deflection and because its naturally porous surface enables maximum water removal, exhibits minimum hydraulic lock and has good sheet release properties.
  • a number of synthetic roll materials are available as substitutes for granite, but none is preferred to granite from a papermaking viewpoint.
  • a papermaking machine utilizes a synthetic felt to support the paper sheet up to its entry into the nip of the press rolls and the life of this felt is determined by the ability of the system to maintain uniform cleanliness of the felt over its width and thereby maintain uniform drainage and absorbtion characteristics.
  • a non-uniform press nip will allow some parts of the felt to retain more water than other parts over its width and, since the water contains fillers from the paper (e.g. clay, alum, etc), this leads to non-uniform blinding of the felt, a problem referred to as streaking.
  • an apparatus in or for a papermaking machine or the like, for controllably and selectively adjusting the temperature profile of a press roll of the machine, such apparatus comprising an array of thermal sources the output flux of each 7 whereof is controllable for selectively heating or cooling an adjoining region of an associated roll surface.
  • the temperature control apparatus is conveniently arranged to be mounted adjacent to the surface of the respective press roll within a cavity within the papermaking machine which is occupied by doctoring apparatus operating to clean the respective roll surface.
  • the doctoring apparatus in modern papermaking machinery commonly comprises a pair of doctor blades bearing upon the roll surface at locations circumferentially spaced apart from each other by a short distance, and it has been fairly recent practice to provide between the doctor blades a source of washing liquid which is sprayed onto the roll surface to ensure that any contaminants which pass the first doctor blade are assuredly removed at or before the second blade.
  • the present invention preferably provides an array of heating/cooling elements within the cavity occupied by the doctoring apparatus and preferably arranged to influence the temperature of the respective roll surface between the two doctor blades, such heating/cooling elements advantageously comprising means for spraying liquid at a selectable temperature onto the adjacent roll surface.
  • Each heating/cooling element may for example comprise a nozzle adapted to receive a flow of liquid at a selected temperature and to emit it as a spray onto an adjacent part of the surface of the press roll.
  • Each of the heating/cooling elements may thus comprise a temperature control unit which selectively offers heating, cooling and washing liquid as required. This can for example be provided by the use of three liquid manifolds, one to contain cooling liquid, another to contain heating liquid and a third to contain washing liquid, with each nozzle being arranged to be connected through actuator-controlled inlet passages selectively to all three of the manifolds.
  • the actuators can for example be solenoid valves, but this is simply an example and alternative methods could be used to provide the correct liquid temperatures (e.g. mixer valves) .
  • the invention in another aspect proposes the provision of means for monitoring the temperature of the surface of the press roll over its length, and these means may for example be used to control the operation of the aforementioned temperature control apparatus though, as described hereinafter, they can have wider application.
  • This temperature monitoring means may be mandatory in a papermaking machine if the objective is accident prevention, but may be optional if the objective is increased throughput and/or quality control.
  • the present invention would propose the fitting of a temperature monitoring means and associated electronics to control the aforementioned heating/cooling means and/or to initiate a procedure to preserve the integrity of the machine, for example a safety shut-down procedure.
  • the roll temperature monitoring means may be considered optional and signals supplied from other equipment on the papermaking machine, for example equipment monitoring sheet temperature and/or moisture content, may be used instead to control the roll heating/cooling apparatus of the present invention.
  • equipment monitoring sheet temperature and/or moisture content may be used instead to control the roll heating/cooling apparatus of the present invention.
  • the temperature monitoring means may for example be an infra-red camera, or a series of infra-red cameras, set up to observe the roll face.
  • a single infra-red camera might for example be mounted on a carriage arranged to traverse the length of the roll, or other methods of enabling the camera or cameras to view the roll face continuously over its width may be utilized.
  • an optical fibre cable could be arranged to enable the entire width of the roll to be observed simultaneously from a single location.
  • a plurality of fixed temperature sensors could be mounted along the width of the roll, or a single, fixed sensor could be arranged to view the entire roll face across its width through a traversing lens or through a plurality of fixed lenses provided along the length of the roll.
  • control apparatus might comprise a computer and might, for example, have inputted thereto a desired temperature profile across the length of the roll, and command signals from the control apparatus to the actuators aforementioned might be established in order to achieve the desired temperature profile at the roll surface.
  • heating/cooling/washing elements may usefully be confined between the blades of a twin doctor assembly, other heating/cooling elements may not impose the same design constraints.
  • Alternative possibilities for heaters include induction heating pads, radiant heaters, steam jets or even the controlled use of friction between a doctor blade and the surface of the roller, and for cooling refrigerated air flows and other cooling means could be used.
  • the invention also contemplates adjustment of the temperature profile of a papermaking machine press roll in order to achieve a pre-deter ined press nip load across the length of the roller pair and not solely for temperature profile considerations.
  • a papermaking machine press roll By such means it becomes easier to obtain and maintain a desired moisture profile across the width of the paper sheet, and so improve product quality and allow for machine speed increases. Since the speed of a papermaking machine is limited by the rate at which the water content of the paper sheet can be removed by the press rolls and also by the rate of moisture removal in the following driers, and since both these removal rates are proportional to the quantity and viscosity of the water within the paper sheet, therefore it follows that the maximum machine speed attainable is governed by those parts of the paper sheet having the highest moisture content.
  • the average moisture content of the paper sheet over its width can be lower than those peak moisture areas caused by a non-uniform press nip, and this will result in faster water removal at the press and more uniform moisture evaporation in the driers, leading to the possibility of an increase in machine speed and therefore greater production capacity as well as a possible saving in steam consumption.
  • a more uniform moisture content profile of the sheet leaving the press rolls would also result in a more uniform shrinkage of the paper sheet in the driers, which in turn would reduce paper sheet damage caused by creasing, stretched sheet edges, and paper sheet breaks, which are a cause of machine stoppages and thereby a cause of production loss.
  • a uniform sheet moisture profile would reduce the tendency for the initial drier cylinders to damage the sheet face by 'picking', and this would enable the operator to increase the temperature within the driers which, in turn, would lead to faster drying of the sheet and either a saving in steam consumption or an increase in machine speed.
  • a uniform press roll profile obtained by appropriate practice of the present invention would result in a more uniform pressure on the wood or other fibres from which the paper sheet is comprised.
  • Non-uniformity of the pressure on these fibres can lead to fibre damage or breakage which results in reduced paper quality and/or strength. Therefore, any reduction in the damage caused to these fibres will enhance paper quality, or alternatively, will enable the operator to use less wood fibre to obtain the same paper quality.
  • the temperature of the press roll face is related to the moisture profile of the paper sheet
  • the temperature readings obtained at the press by an apparatus according to the present invention which includes a temperature monitoring means, can be used to adjust and/or control the so-called machine head box slice which is responsible for determining the paper sheet moisture profile in the first instance.
  • the invention also enables press felt life to be increased, inter alia by decreasing "streaking", which has advantageous effect in regard to felt costs and reduces machine down time caused by felt changes.
  • a method of operating a papermaking machine or the like comprising monitoring the temperature profile across the length of a press roll of the machine and, in dependence thereon, adjusting one or more process variables and/or operating conditions of the machine.
  • Said one or more process variables and/or operating conditions might for example comprise one or more of;
  • Fig. 1 is a schematic diagram showing one of a pair of press rolls of a paper making machine, and associated roll surface temperature monitoring and control equipment according to an embodiment of the present invention
  • Fig. 2 is a vertical section through the apparatus depicted schematically in Fig. 1. DETAILED DESCRIPTION OF THE EMBODIMENT;
  • a press roll 10 (which could be formed of synthetic material or of natural granite) of a papermaking machine has a cylindrical surface 16 which is observed by an infra-red camera 11 mounted on a carriage which runs to and fro along the length of the roll 10 on a track 12.
  • a command line 16 from the control apparatus 15 controls means (not shown) to move the carriage along the track, and a control line 17 from the carriage provides information to the control apparatus 15 regarding the position of the carriage on the track 12.
  • Temperature data from the camera 11 is fed to the control apparatus 15 through a data line 18.
  • the control apparatus 15 comprises a computer and has the usual input/output peripherals 19 such as a keyboard and display screen so that, for example, a temperature profile across the length of the roll 10 can be displayed on the screen, and a desired temperature profile can be inputted to the apparatus 15.
  • the control apparatus 15 may also be connected to other parts of the papermaking machine, such as for example to the steam box of the machine, for determining the operation thereof.
  • the temperature of the surface of the roll 10 is arranged to be controlled by controlling the temperature of a spray liquid supplied through a plurality of spray nozzles 21 which are controlled by solenoid valves 20a to 20n.
  • the number of nozzles and solenoid valves shown in Fig. 1 is schematic only and in practice there are likely to be very many more than are shown.
  • Each of the solenoid valves 20 is a three way valve, or alternatively three individual valves, connected in such a manner as to enable liquid selection from any one of three liquid manifolds 22, 23 and 24.
  • Manifold 22 contains hot liquid
  • manifold 23 contains cool liquid
  • manifold 24 contains washing liquid having a temperature generally the same as that of the roll surface.
  • Each nozzle 21 is arranged to receive liquid from one of the manifolds 22, 23 and 24 at all times thus ensuring continuous washing of the roll surface with either hot, cool or roll temperature liquid.
  • the solenoid valves are controlled by command lines 25 which run from the control apparatus 15.
  • a twin doctor assembly 30 has a frame 31 which defines a cavity 32 between a first nose bar 33 of the frame and a second nose bar 34 thereof.
  • a first doctor blade holder 35 is secured to the first nose bar 33 and includes a first doctor blade 36 which runs on the surface 37 of the granite roll 10.
  • the second nose bar 34 carries a second doctor blade holder 38 and blade 39 which again runs on the surface of the roll 10.
  • the entire doctor assembly provides for pivoting of the frame 31 to carry the blades 36 and 39 well away from the surface 37 of the roll 10. This pivoting movement is under the control of a pair of piston/cylinders 40 in a manner known per se.
  • the prime function of the piston/cylinders is, however, to lock the doctor assembly in its operational position, and to move it away from the roll for maintenance work on the doctor or when it is required to remove the roll from the machine.
  • Within the cavity 32 is housed the spray nozzles 21 shown schematically in Fig. 1.
  • the solenoid valves 20a to 2On, and the three manifolds 22, 23 and 24 are housed within the doctor support frame 31 and are accessible through a plurality of access doors in the front face of the support frame. In other embodiments, they may be housed elsewhere on or in the doctor assembly.
  • Liquid drains are provided to remove the used wash liquid, and/or heating and cooling liquid from cavity 32 continually during operation. Apart from any roll surface temperature control function, it is necessary to wash the surface of the roll 10 at all times during operation, and for this reason nozzles 21 will receive liquid from one of the manifolds 22, 23 and 24 generally at all times. If no temperature profiling is called for, the nozzles would receive washing liquid from manifold 24 generally at the same temperature as the roll face. The purpose of this washing liquid is to remove from the roll face any particulate matter which may get past the first doctor blade 36.
  • control apparatus 15 causes the camera 11 to effect reciprocating movement on the track 12 so that it performs a double helical scan over the surface of the rotating press roll 10 for every rotational cycle of the press roll.
  • the output from the camera 11 is compared to a desired temperature profile inputted to the control apparatus 15 and any departures from the desired temperature profile are corrected by issuing from the control apparatus 15 command signals down the command lines 25 to the appropriate ones of solenoid valves 20a to 20n thereby causing the respective valves to change over from using wash liquid from manifold 24, to using hot or cool liquid from manifold 22 or 23 whichever is appropriate.
  • camera 11 detects an area of the roll having a temperature higher than that desired, it will, via the control apparatus 15, cause the appropriate solenoid valve or valves to select liquid from the cool manifold 23, and similarly where the camera 11 detects a cool area of roll surface, it will cause the control apparatus 15 to instruct the appropriate solenoid valve or valves to draw liquid from the hot manifold 22.
  • the liquid thus selected will be sprayed onto the roll surface 37 with the effect of raising or lowering the roll surface temperature at the respective locations towards the desired temperature.
  • the temperature profile of the roll face 37 is preferably displayed on the display screen of computer peripheral 19 to provide visual operator information and both desired and actual temperature profiles may be displayed.
  • the control apparatus 15 is preferably pre-programmed with a selection of limit conditions to ensure that safe working conditions are maintained at all times. For example, in the event that camera 11 detects a hot area of the roll and, after causing the control apparatus 15 to instruct respective solenoid valves 20 to utilize cool water from manifold 23, the roll temperature continues to increase, then, at a pre- determined limit programmed into the controller 15, the controller may be arranged to interrupt the steam supply to a corresponding part of the associated steam box and to advise the operator by way of a visual and/or audible alarm.
  • the controller 15 may relinquish its control of the steam supply and continue with temperature control by liquid spray only.
  • the apparatus may be arranged to initiate a shut-down procedure for the machine and to warn the operator by an audible and/or visible alarm.
  • the apparatus shown in the drawings is susceptible to modification by use, for example, of compressed air and/or steam in addition to or instead of liquid sprays.
  • the thermal effect of the impingement of a jet of air or steam at any given temperature onto the surface of the press roll is considerably different to that of a liquid spray, and it is possible that by use of such alternative mediums either by themselves or in combination with liquid sprays a finer or speedier control of the roll temperature may be obtainable in specialised instances. Accordingly, it is not intended, in describing the foregoing apparatus, to restrict the invention to use of liquid media only.
  • the apparatus hereinbefore described might be employed in any one of four forms, namely:- 1. Primary Automatic Version, to counteract the failure of granite rolls.
  • This version would apply only to papermaking machines employing granite rolls in conjunction with steam boxes.
  • the apparatus would consist of a twin doctor assembly 30, an integral washing shower 24, a heating/cooling roll ' temperature modification device 22, 23, an infra-red roll temperature scanning device 11, and a controller 15. These components would be arranged to operate automatically whenever the paper machine was in operation, and the controller would be pre-programmed with the operational working limits and the safe working limits of the granite roll.
  • the apparatus employed would consist of all that described for the Primary Automatic Version, but the controller 15 programme would be different since in this version there would be no necessity to guard against roll failure.
  • the programme would include only those features necessary to achieve maximum paper quality and/or maximum paper machine speed, and the apparatus would control the profile of the press roll accordingly.
  • the commands from controller 15 could be arranged to be manually over-ridden by the operator through input monitor 19 at any time should this be desirable.
  • This version of the apparatus could be speedily re-programmed to 24 correspond to the Primary Automatic Version abovementioned in the event that the paper machine were ever converted to using a granite roll in conjunction with a steam box (i.e. it could revert to including a safety function) .
  • the machine operator would view an existing machine monitor which displays the moisture profile of the finished paper sheet just 25 before the calendering operation and, based on this visual assessment of the paper moisture profile, he would be able to manipulate the press roll profile by use of the manual switching arrangement in order, to enhance the sheet moisture profile.
  • This manual version of the invention could be up ⁇ graded to either a Primary or Secondary Automatic version by the addition of the camera and controller etc if and when required.
  • control line 25 would be connected to a known mechanism incorporated into the roll body and arranged to modify the crown or profile of the roll face, such mechanism being supplied as part of the roll and being outside the scope of the present invention.
  • the apparatus relevant to the invention would function in the same manner as already described herein, but instead of using heating, cooling and washing showers to modify the roll profile, it would use the existing equipment built into crown controlled rolls by the roll supplier.
  • the present invention provides an apparatus for paper machine press roll profile control, the apparatus comprising: a twin doctor assembly having a first, upstream doctor blade and blade holder, and a second, downstream doctor blade and blade holder all mounted on a common support frame in such a manner as to define a cavity between the blades which is naturally isolated from the normal activities of the machine operator and which is remote from the influences of the paper making process but is open to the roll surface between the two doctor blades; an integral multi-nozzle shower mounted in or on the twin doctor assembly and capable of delivering washing liquid under pressure to the isolated segment of the press roll surface between the two doctor blades, such washing liquid being delivered at approximately the same temperature as the roll face temperatures; and an additional heating and cooling arrangement mounted in or on the twin doctor assembly, for overriding any one or more of the heated wash shower nozzles and heating or cooling that specific area of the roll face to a higher or lower temperature than the washing shower would otherwise provide.
  • the heating and cooling arrangement as described employs liquids of known temperature to perform its duty of raising or lowering the roll surface temperature in specific areas, but heating and cooling fluxes other than liquid may be utilized and steam, induction heating, radiant heating, heating and cooling air flows or whatever other suitable medium may be available may be employed.
  • the profiling of the press roll is not restricted to the use of the heating and cooling system described, and the apparatus may be used in conjunction with existing mechanical apparatus designed for press roll profile manipulation by mechanical, hydraulic or electrical means (crown controlled rolls) .
  • the invention also proposes that the temperature profile of the roll-face or paper sheet, or the moisture content of the paper sheet, may be accurately determined and utilized via a computer to control the press roll profile by adjusting the wash liquid showers, the heating and cooling devices, and/or any other existing paper machine equipment.
  • Temperature measurements of the roll face are described as being determined by one or more infra-red cameras, or bolometers, mounted on a tracking mechanism attached to the twin doctor support frame and arranged to scan the roll face and to feed the derived temperature information to a process controller which controls the heating, cooling and washing mechanisms.
  • this prime information is not limited to that obtained by one or more infra-red cameras, and may be sourced from a fibre optic system mounted in or on the twin doctor support, or from a completely independent piece of apparatus mounted elsewhere on the papermaking machine (not being part of this apparatus) and producing signals intended primarily for other purposes.

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Abstract

Afin de réduire les contraintes thermiques appliquées sur les rouleaux exprimeurs en granite des machines de fabrication de papier et qui sont dues à l'injection de vapeur dans le papier avant son entrée dans l'exprimeur, un alignement de gicleurs (21) capables de faire jaillir de manière sélective des liquides de lavage à des températures de chauffage, de refroidissement et normales de rouleaux, sont ménagés dans une chambre (32) entre des couteaux nettoyeurs jumeaux se déplaçant sur la surface du rouleau. Une soupape solénoïdale (20) régule l'alimentation à chaque gicleur (21) à partir de collecteurs de liquide (22, 23, 24) à température de chauffage, de refroidissement et normale, et les soupapes solénoïdales (20a..20n) sont commandées selon les différences entre un profil de température de rouleau idéal entré dans l'appareil de commande (15) par l'opérateur de la machine et le profil de température de rouleau réel tel qu'il est surveillé par une caméra infrarouge (11) qui se déplace en arrière et en avant en explorant la surface du rouleau. Cette régulation des contraintes thermiques affectant les rouleaux de granite permet de faire fonctionner la machine de fabrication de papier de manière sûre à des vitesse maximales et la qualité du papier en sera rehaussée. Le même équipement peut aussi être avantageusement utilisé dans des machines de fabrication de papier pourvues de rouleaux exprimeurs synthétiques.
PCT/GB1991/000829 1990-05-24 1991-05-24 Ameliorations relatives a la fabrication de materiaux en feuille WO1991018146A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9011602.1 1990-05-24
GB909011602A GB9011602D0 (en) 1990-05-24 1990-05-24 Apparatus for paper machine press roll control
GB919106129A GB9106129D0 (en) 1990-05-24 1991-03-22 Improvements relating to the manufacture of sheet material
GB9106129.1 1991-03-22

Publications (1)

Publication Number Publication Date
WO1991018146A1 true WO1991018146A1 (fr) 1991-11-28

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ID=26297109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000829 WO1991018146A1 (fr) 1990-05-24 1991-05-24 Ameliorations relatives a la fabrication de materiaux en feuille

Country Status (2)

Country Link
AU (1) AU7894391A (fr)
WO (1) WO1991018146A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2082671A1 (es) * 1991-12-13 1996-03-16 Pastor Francisco Garcia Perfeccionamientos en el proceso mecanico de prensado en la fabricacion de papel.
EP0818574A2 (fr) * 1996-07-11 1998-01-14 Voith Sulzer Papiermaschinen GmbH Dispositif de nettoyage
WO1998027279A1 (fr) * 1996-12-17 1998-06-25 Valmet Corporation Ensemble lame de docteur perfectionne
EP1431456A1 (fr) * 2002-12-21 2004-06-23 Voith Paper Patent GmbH Procédé et appareil pour faire fonctionner une machine de production ou de finition d'un matériau en bande
WO2012032121A1 (fr) * 2010-09-08 2012-03-15 Ctp Gmbh Unité d'application
EP2504090B2 (fr) † 2009-11-24 2019-06-26 GEA Process Engineering A/S Procédé de surveillance d'un séchoir à pulvérisation comprenant une ou plusieurs caméras infrarouges

Citations (8)

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Publication number Priority date Publication date Assignee Title
US3177799A (en) * 1963-01-10 1965-04-13 Beloit Corp Apparatus for selectively temperature conditioning calenders
US3203678A (en) * 1963-05-01 1965-08-31 Warren S D Co Temperature control system for rolls
FR2372929A1 (fr) * 1976-12-02 1978-06-30 Ahlstroem Dev Gmbh Dispositif pour la mise en forme d'un produit alimente en forme de bande, notamment de pate a introduire dans une machine a papier, et autres installations analogues
EP0201783A2 (fr) * 1985-05-08 1986-11-20 Kleinewefers GmbH Système de rouleau à compensation de la flèche et réglage de la température
DE3741128A1 (de) * 1986-12-18 1988-06-30 Valmet Oy Verfahren zur steuerung und/oder ueberwachung eines bahnbeschichtungstrocknungsprozesses
EP0296730A2 (fr) * 1987-06-15 1988-12-28 Pulp and Paper Research Institute of Canada Procédé et dispositif de séchage et/ou de pressage rapide d'une bande poreuse
US4867054A (en) * 1988-01-26 1989-09-19 Thermo Electron Web Systems, Inc. Caliper control system
EP0401188A2 (fr) * 1989-06-01 1990-12-05 Valmet Paper Machinery Inc. Système de contrôle pour une machine à papier ou carton

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177799A (en) * 1963-01-10 1965-04-13 Beloit Corp Apparatus for selectively temperature conditioning calenders
US3203678A (en) * 1963-05-01 1965-08-31 Warren S D Co Temperature control system for rolls
FR2372929A1 (fr) * 1976-12-02 1978-06-30 Ahlstroem Dev Gmbh Dispositif pour la mise en forme d'un produit alimente en forme de bande, notamment de pate a introduire dans une machine a papier, et autres installations analogues
EP0201783A2 (fr) * 1985-05-08 1986-11-20 Kleinewefers GmbH Système de rouleau à compensation de la flèche et réglage de la température
DE3741128A1 (de) * 1986-12-18 1988-06-30 Valmet Oy Verfahren zur steuerung und/oder ueberwachung eines bahnbeschichtungstrocknungsprozesses
EP0296730A2 (fr) * 1987-06-15 1988-12-28 Pulp and Paper Research Institute of Canada Procédé et dispositif de séchage et/ou de pressage rapide d'une bande poreuse
US4867054A (en) * 1988-01-26 1989-09-19 Thermo Electron Web Systems, Inc. Caliper control system
EP0401188A2 (fr) * 1989-06-01 1990-12-05 Valmet Paper Machinery Inc. Système de contrôle pour une machine à papier ou carton

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2082671A1 (es) * 1991-12-13 1996-03-16 Pastor Francisco Garcia Perfeccionamientos en el proceso mecanico de prensado en la fabricacion de papel.
EP0818574A2 (fr) * 1996-07-11 1998-01-14 Voith Sulzer Papiermaschinen GmbH Dispositif de nettoyage
EP0818574A3 (fr) * 1996-07-11 1999-01-20 Voith Sulzer Papiermaschinen GmbH Dispositif de nettoyage
US5964960A (en) * 1996-07-11 1999-10-12 Voith Sulzer Papiermaschinen Gmbh Cleaning device
WO1998027279A1 (fr) * 1996-12-17 1998-06-25 Valmet Corporation Ensemble lame de docteur perfectionne
EP1431456A1 (fr) * 2002-12-21 2004-06-23 Voith Paper Patent GmbH Procédé et appareil pour faire fonctionner une machine de production ou de finition d'un matériau en bande
EP2504090B2 (fr) † 2009-11-24 2019-06-26 GEA Process Engineering A/S Procédé de surveillance d'un séchoir à pulvérisation comprenant une ou plusieurs caméras infrarouges
US11123700B2 (en) 2009-11-24 2021-09-21 Gea Process Engineering A/S Method of monitoring a spray dryer and a spray dryer comprising one or more infrared cameras
WO2012032121A1 (fr) * 2010-09-08 2012-03-15 Ctp Gmbh Unité d'application
AU2011298763B2 (en) * 2010-09-08 2015-06-11 Ctp Gmbh Application unit
US9555435B2 (en) 2010-09-08 2017-01-31 Ctp Gmbh Apparatus wtih pad having a fabric structure to apply a liquid

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Publication number Publication date
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