EP0659933A1 - Process for controlling and regulating the drainage of a fibrous suspension in the forming section of a paper machine and apparatus for the application of the process - Google Patents

Process for controlling and regulating the drainage of a fibrous suspension in the forming section of a paper machine and apparatus for the application of the process Download PDF

Info

Publication number
EP0659933A1
EP0659933A1 EP94402821A EP94402821A EP0659933A1 EP 0659933 A1 EP0659933 A1 EP 0659933A1 EP 94402821 A EP94402821 A EP 94402821A EP 94402821 A EP94402821 A EP 94402821A EP 0659933 A1 EP0659933 A1 EP 0659933A1
Authority
EP
European Patent Office
Prior art keywords
block
motor
drainage
fibrous suspension
fabric
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.)
Withdrawn
Application number
EP94402821A
Other languages
German (de)
French (fr)
Inventor
Daniel Haulot
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.)
Chleq Frote et Cie
Original Assignee
Chleq Frote et Cie
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 Chleq Frote et Cie filed Critical Chleq Frote et Cie
Publication of EP0659933A1 publication Critical patent/EP0659933A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable

Definitions

  • the first drainage carried out in the area of the drainage elements is regular and progressive.
  • a drip roller is commonly used installed between two series of suction boxes.
  • This roller has the effect of modifying the distribution of the fibers in the sheet being formed, but to obtain the optimum effect of this drip roller, the fibrous suspension must be present at the entrance of the roller at a well determined concentration. .
  • the invention proposes to overcome these drawbacks by ensuring continuous adjustment of a movable or deformable draining element body, in an angular range of 0 to 4 °, so as to adapt the draining capacity of each element to the needs of each product produced, and to maintain constant the predetermined drip curves, so that the sheet being formed is presented at the entry of the drip roller with the desired concentration, thereby obtaining the desired air.
  • a main object of the present invention therefore consists in a process for controlling and adjusting the drainage of a fibrous suspension on a forming table of a paper machine comprising a fine fabric which is unrolled continuously and receives said suspension distributed by a head box, draining elements arranged under the fabric ensuring a first draining of the fibrous suspension, followed by wet boxes and boxes suction which completes the drainage, process by which the angles of the surface of the drainage elements are continuously adjusted relative to the surface of the fabric during the first phase of sheet formation as a function of the control of the levels of vacuum in the suction boxes and in the wet boxes downstream of said drainage elements and according to the measurement of the concentration of the fibrous suspension on the fabric of manufacture.
  • Another main object of the present invention consists of a device for implementing said method according to which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a forming table of a paper, the profiled part being a block that can be moved relative to a fixed profiled block with respect to the forming table to continuously give a variable angle of the ceramic coating relative to the fabric receiving the fibrous suspension.
  • the block is movable on the profiled block under the action of a motor engaged with the pivoting block, elastic means holding said blocks against each other, and the position of the end of the ceramic coating remains constant by relative to the canvas, whatever the angle of adjustment.
  • the elastic means consist of a metal clip or U-shaped stirrup.
  • the invention consists of a device for implementing said method in which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a training table of a paper, the profiled part being a deformable block having a one-piece extruded profile, the lower part of which is fixed with respect to the forming table and the upper part of which swivels slightly to continuously give a variable angle of the ceramic coating relative to to the canvas receiving the fibrous suspension.
  • the block is deformable under the action of a motor acting on the upper part of the block.
  • the active part of the motor is a deformable enclosure actuated by a thermodilatable device or a mechanical jack, or else it is a rack moving along a fixed element under the action of a cylinder also actuated by a thermodilatable device.
  • a control computer is connected to the motors of the drip elements, to the wet boxes and to the suction boxes as well as to concentration sensors of the fibrous suspension.
  • Figure 1 a schematic elevational view of a training table of a paper machine.
  • Figure 2 a sectional view on a larger scale of a standard profile of a drip element.
  • FIGS. 6a, 6b schematic views of alternative hydraulic versions of the motor of a drip element.
  • Figure 7 a schematic view of a mechanical version of the motor of a drip element.
  • Figure 8 an enlarged view of a rack of said motor element.
  • Figure 9 a schematic view of a paper machine training table with its control computer.
  • FIG. 1 illustrates the conventional profile of a forming table of a paper machine in which an endless cloth 5 rotates continuously between a head roller 2 and a driving roller 3 passing alternately above and below return rollers 4 which ensure its guidance and its tension.
  • the canvas is maintained by a succession of equipment, namely an entry marble 6, a series of boxes of draining elements designated as a whole by the reference 1 , wet boxes 7, suction boxes 8 between which a drip roller 9 is inserted and finally a suction cylinder 20 upstream of the driving roller 3.
  • FIG. 2 shows a standard profile of a drip element 1 in which one can recognize a block 10 serving as a support for an upper covering 11 made of ceramic, a block which is profiled at its lower part to adapt to a holding box not shown. It can be seen that the upper face 12 of the covering 11 forms an angle ⁇ - in the present case of the order of 4 ° - with the endless cloth 5.
  • FIG. 3a shows an example of a draining element 1 according to the invention in which the same parts are designated by the same references.
  • the block 10 serving as a support for the ceramic coating 11 rests on a second profiled block 13 which can be installed on the holding box and which is therefore fixed with respect to the training table.
  • the block 10 can pivot relative to this second block 13 thanks to an articulation 14 located on the side.
  • Each of the blocks (10, 13) has a lateral notch 15 serving as a housing for a ring 16 for blocking a clip 17 - a sort of spring blade which holds the blocks applied against each other.
  • a motor 18 resting on the block 13, and in engagement with the pivoting block 10 can impart to the latter a slight rotation around the articulation 14, which causes the modification of the angle of the surface 12 of the ceramic coating 11 relative to to the canvas.
  • FIG. 3b differs in that the articulation 14 is replaced by a particular profile of the block 13 which has a chute 34 with rounded walls inside which can slide a leg 35 which makes part of the block 10.
  • the motor 18 can therefore modify the angle ⁇ by spreading (on the left in the figure) the block 13, since the leg 35 can slide in the guide trough 34.
  • the position of the end A of the ceramic coating remains constant with respect to the fabric, whatever the angle ⁇ of adjustment.
  • FIGS 4 and 5 show alternative embodiments of the device shown in Figure 3.
  • the blocks 10 and 13 form between them a profiled cell 19 inside which a metal stirrup 21 in the shape of a U, comes out and ensures the connection between the two blocks.
  • a motor element 18 is housed between the branches of the stirrup 21 and, as in the previous case, it can give the block 10 a slight rotation with respect to the fixed block 13 which modifies the angle of the ceramic coating 11 by compared to the canvas.
  • the block 10 is deformable and has a one-piece extruded profile comprising the reservations necessary for fixing the ceramic coating 11, as well as for fixing to the supports of the box which hold the draining elements. It also has a central cell 19 containing a motor 18 which acts in an equivalent way by slightly pivoting the upper part of the block 10 while the lower part remains fixed with respect to the training table.
  • the motor element 18 can be produced in a hydraulic version or in a mechanical version.
  • FIG. 6a shows that the active part of the motor is a deformable enclosure 22 connected by a capillary 23 to a jack 24 actuated by a thermodilatable device 25 against the force of a small return spring 26 .
  • the deformable enclosure 22 is connected to a hydraulic cylinder 24 actuated by a mechanical cylinder, not shown, itself by an electric motor.
  • the capillary 23 leads to a capacity of thermodilatable fluid 25 subjected to a heating resistor 27.
  • a control computer 28 controls the two thermodilatable capacities, the hydraulic fluid at the deformable enclosure 22 being controlled by pressure (FIG. 6a), or by temperature (FIG. 6b).
  • the mobile element of the motor is a rack 29 which moves along a fixed element 30 under the action of a jack 31 connected by a capillary 23 to an actuator 25 of the kind described above.
  • a control computer 28 also controls this actuator.
  • the fixed element is internally serrated to hang the rack.
  • the rack 29 could move along the fixed element 30 under the action of an endless screw actuated by an electric or compressed air motor.
  • the fixed element 30 is not serrated but balls 32 ensure the locking of the rack 29.
  • the racks shown are double but they could be simple, according to another embodiment.
  • FIG. 9 The method for controlling the drainage of the fibrous suspension on the forming table is illustrated in FIG. 9.
  • the control computer 28 receives information, on the one hand on the angle of the ceramic coatings with respect to the fabric 5, for all of the draining elements 1, on the other hand on the vacuum control both at level of the wet boxes 7 as of the suction boxes 8 upstream of the drip roller 9.
  • the computer also receives detectors 33, on either side of said boxes, a signal representative of the continuous measurements at these two places of the concentration of fibrous suspension on the forming fabric.
  • the comparison of the measurement signal with a reference signal results in the formation of a comparison signal, on the basis of which the angles of the drip elements and of the valves controlling the vacuum of the suction boxes are adjusted. It is advantageous that the reference signal can take any value within a determined range so that the setting of the drip elements and the vacuum valves is only changed for a minimum variation of the concentration of the fibrous suspension on the fabric .

Landscapes

  • Paper (AREA)

Abstract

The drainage member (1) consists of a ceramic coating (11) mounted on a profiled component which is a block (10) capable of being moved in relation to a profiled block (13), itself stationary in relation to the wire section of the paper machine, in order to impart continuously a variable angle to the surface (12) of the drainage member, in relation to the cloth receiving the fibre suspension. Application to the wire sections of paper machines. <IMAGE>

Description

L'invention se rapporte à une table de formation d'une machine à papier et concerne plus particulièrement un procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur ladite table pendant la première phase de formation d'une feuille ainsi qu'un dispositif de mise en oeuvre du procédé consistant en un support déplaçable ou déformable permettant de faire varier en continu l'angle de l'élément d'égouttage par rapport à la toile de formation.

  • La table de formation d'une machine à papier se compose d'une toile fine continue qui tourne à la vitesse de la machine. Aux deux extrémités de la table, ainsi que sur le brin de retour, la toile tourne sur des rouleaux qui ont pour but de l'entraîner à la vitesse voulue, de la guider et de maintenir constante sa tension. Sur le brin supérieur, la toile reçoit une suspension fibreuse apportée par un distributeur appelé caisse de tête. Cette suspension fibreuse qui contient également des charges minérales est déversée sur la toile à une concentration comprise entre 3 et 20 gr/litre, ce qui veut dire que pour une concentration de 10 gr/litre par exemple, il faut déverser sur la toile plus de 100 l d'eau pour faire un kg de papier.
  • Sur son parcours supérieur, la toile est maintenue par un ensemble d'équipements qui en plus de la supporter, doivent favoriser l'extraction de l'eau libre apportée par la suspension fibreuse.
  • En suivant le sens de progression de la suspension fibreuse sur la toile, ces éléments sont : un marbre, des éléments d'égouttage, des caisses humides (avec ou sans vide additionnel), des caisses aspirantes, un rouleau égoutteur et enfin un cylindre aspirant.
  • Entre la sortie de la caisse de tête et la sortie du cylindre aspirant, la suspension fibreuse passe d'une concentration de quelques grammes par litre (10 gr/l par exemple) à 200 gr/l environ. La zone des éléments d'égouttage doit permettre l'égouttage de la suspension fibreuse depuis la sortie de la caisse de tête (environ 10 gr/l) jusqu'à obtenir 40 à 50 gr/l de fibres. Ensuite ce sont les caisses humides et les caisses aspirantes qui favorisent l'égouttage pour atteindre les 200 gr/l en sortie du cylindre aspirant.
The invention relates to a table for forming a paper machine and relates more particularly to a process for controlling and adjusting the drainage of a fibrous suspension on said table during the first phase of forming a sheet as well that a device for implementing the method consisting of a movable or deformable support making it possible to continuously vary the angle of the drip element with respect to the forming fabric.
  • The forming table of a paper machine consists of a continuous fine fabric which rotates at the speed of the machine. At the two ends of the table, as well as on the return strand, the fabric turns on rollers which aim to drive it at the desired speed, to guide it and to keep its tension constant. On the upper strand, the fabric receives a fibrous suspension provided by a distributor called the headbox. This fibrous suspension which also contains mineral fillers is poured onto the canvas at a concentration of between 3 and 20 gr / liter, which means that for a concentration of 10 gr / liter for example, it is necessary to pour onto the canvas more than 100 l of water to make one kg of paper.
  • On its upper course, the fabric is maintained by a set of equipment which in addition to supporting it, must promote the extraction of free water provided by the fibrous suspension.
  • Following the direction of progression of the fibrous suspension on the canvas, these elements are: a marble, draining elements, wet boxes (with or without additional vacuum), suction boxes, a drip roller and finally a suction cylinder .
  • Between the exit from the headbox and the exit from the suction cylinder, the fibrous suspension changes from a concentration of a few grams per liter (10 gr / l for example) to around 200 gr / l. The area of the drainage elements must allow the drainage of the fibrous suspension from the outlet of the headbox (approximately 10 gr / l) until 40 to 50 gr / l of fiber are obtained. Then it is the wet boxes and the suction boxes which promote drainage to reach 200 gr / l at the outlet of the suction cylinder.

Pour obtenir une belle formation de feuille et un bel épair, il est très souhaitable que le premier égouttage réalisé dans la zone des éléments d'égouttage soit régulier et progressif. Par ailleurs, pour améliorer l'épair, on utilise couramment un rouleau égoutteur installé entre deux séries de caisses aspirantes.To obtain a nice leaf formation and a good appearance, it is very desirable that the first drainage carried out in the area of the drainage elements is regular and progressive. In addition, to improve the appearance, a drip roller is commonly used installed between two series of suction boxes.

Ce rouleau a pour effet de modifier la distribution des fibres dans la feuille en cours de formation, mais pour obtenir l'effet optimum de ce rouleau égoutteur, il faut que la suspension fibreuse se présente à l'entrée du rouleau à une concentration bien déterminée.This roller has the effect of modifying the distribution of the fibers in the sheet being formed, but to obtain the optimum effect of this drip roller, the fibrous suspension must be present at the entrance of the roller at a well determined concentration. .

L'égouttage de la suspension fibreuse sur la toile dépend d'un certain nombre de paramètres tels que par exemple la maille de la toile utilisée et sa vitesse de défilement, ainsi que la composition, la concentration et la température de la suspension fibreuse de même que le degré de raffinage des fibres cellulosiques avant leur envoi sur la toile. Il faut tenir compte aussi de l'encrassement des toiles et des éléments d'égouttage ainsi que de leur angle par rapport à la toile, sachant que plus l'angle est fort, plus l'égouttage est forcé.

  • Les éléments d'égouttage que l'on rencontre sur le marché sont généralement réalisés en matières plastiques (polyéthylène basse pression à très haut poids moléculaire) avec sur leur partie supérieure qui est en contact avec la toile de formation, un revêtement en céramique permettant d'obtenir un faible coefficient de frottement, ce qui permet de minimiser l'usure des toiles, et une résistance excellente à l'usure, d'où une longueur de vie améliorée des éléments d'égouttage.
    L'angle du talon de l'élément d'égouttage par rapport à la toile est fixe par construction. Habituellement les éléments d'égouttage sont fabriqués dans une plage angulaire de 0° à 4° avec une variation de 0,5° en 0,5°.
  • Lors de la mise en service d'une installation, le nombre d'éléments d'égouttage et leur angle sont déterminés pour la fabrication la plus représentative à réaliser par l'installation, et lorsque les autres produits à fabriquer sont programmés sur la machine, on procède à la modification de l'égouttage (ou rajoute ou retire quelques éléments ; quelquefois on remplace des éléments donnés par d'autres ayant des angles différents).
    En pratique, cette opération s'avère délicate et n'est pas appliquée de façon systématique, à cause des risques de détériorer la toile de formation et de la fragilité des revêtements céramiques des éléments d'égouttage.
  • Par ailleurs, si au cours d'une fabrication donnée un paramètre influençant l'égouttage est modifié de façon intempestive (le raffinage par exemple), tout le comportement de la suspension fibreuse en cours d'égouttage sur la toile s'en trouve modifié ; il s'ensuit que l'épair peut s'en trouver fortement altéré.
The drainage of the fibrous suspension on the canvas depends on a certain number of parameters such as for example the mesh of the canvas used and its speed of travel, as well as the composition, the concentration and the temperature of the fibrous suspension as well than the degree of refinement of the cellulosic fibers before they are sent to the canvas. It is also necessary to take into account the fouling of the fabrics and the drip elements as well as their angle with respect to the fabric, knowing that the stronger the angle, the more the drainage is forced.
  • The drip elements that are found on the market are generally made of plastics (low pressure polyethylene with very high molecular weight) with on their upper part which is in contact with the forming fabric, a ceramic coating allowing '' obtain a low coefficient of friction, which minimizes the wear of the fabrics, and excellent resistance to wear, hence an improved life of the drip elements.
    The angle of the heel of the drip element with respect to the canvas is fixed by construction. Usually the drip elements are made in a range angular from 0 ° to 4 ° with a variation of 0.5 ° into 0.5 °.
  • When an installation is put into service, the number of drip elements and their angle are determined for the most representative manufacturing to be carried out by the installation, and when the other products to be manufactured are programmed on the machine, we proceed to the modification of the draining (or add or remove some elements; sometimes we replace elements given by others having different angles).
    In practice, this operation proves to be delicate and is not applied systematically, because of the risks of damaging the forming fabric and the brittleness of the ceramic coatings of the draining elements.
  • Furthermore, if during a given manufacture a parameter influencing the draining is modified in an untimely manner (refining for example), the whole behavior of the fibrous suspension being drained on the canvas is modified; it follows that the air may be greatly altered.

L'invention se propose de pallier à ces inconvénients en assurant un réglage en continu d'un corps d'élément d'égouttage déplaçable ou déformable, dans une plage angulaire de 0 à 4°, de façon à adapter la capacité d'égouttage de chaque élément aux besoins de chaque produit fabriqué, et de maintenir constantes les courbes d'égouttage prédéterminées, afin que la feuille en cours de formation se présente à l'entrée du rouleau égoutteur avec la concentration voulue, pour obtenir ainsi l'épair souhaité.The invention proposes to overcome these drawbacks by ensuring continuous adjustment of a movable or deformable draining element body, in an angular range of 0 to 4 °, so as to adapt the draining capacity of each element to the needs of each product produced, and to maintain constant the predetermined drip curves, so that the sheet being formed is presented at the entry of the drip roller with the desired concentration, thereby obtaining the desired air.

Un objet principal de la présente invention consiste donc en un procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier comportant une toile fine qui se déroule en continu et reçoit ladite suspension distribuée par une caisse de tête, des éléments d'égouttage disposés sous la toile assurant un premier égouttage de la suspension fibreuse, suivis de caisses humides et de caisses aspirantes qui complètent l'égouttage, procédé selon lequel on assure le réglage en continu des angles de la surface des éléments d'égouttage par rapport à la surface de la toile pendant la première phase de formation de la feuille en fonction du contrôle des niveaux de vide dans les caisses aspirantes et dans les caisses humides en aval desdits éléments d'égouttage et en fonction de la mesure de la concentration de la suspension fibreuse sur la toile de fabrication.A main object of the present invention therefore consists in a process for controlling and adjusting the drainage of a fibrous suspension on a forming table of a paper machine comprising a fine fabric which is unrolled continuously and receives said suspension distributed by a head box, draining elements arranged under the fabric ensuring a first draining of the fibrous suspension, followed by wet boxes and boxes suction which completes the drainage, process by which the angles of the surface of the drainage elements are continuously adjusted relative to the surface of the fabric during the first phase of sheet formation as a function of the control of the levels of vacuum in the suction boxes and in the wet boxes downstream of said drainage elements and according to the measurement of the concentration of the fibrous suspension on the fabric of manufacture.

Un autre objet principal de la présente invention consiste en un dispositif pour la mise en oeuvre dudit procédé selon lequel l'élément d'égouttage constitué d'un revêtement céramique est monté sur une pièce profilée adaptée à une table de formation d'une machine à papier, la pièce profilée étant un bloc déplaçable par rapport à un bloc profilé fixe vis-à-vis de la table de formation pour donner en continu un angle variable du revêtement céramique par rapport à la toile recevant la suspension fibreuse.Another main object of the present invention consists of a device for implementing said method according to which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a forming table of a paper, the profiled part being a block that can be moved relative to a fixed profiled block with respect to the forming table to continuously give a variable angle of the ceramic coating relative to the fabric receiving the fibrous suspension.

Le bloc est déplaçable sur le bloc profilé sous l'action d'un moteur en prise avec le bloc pivotant, des moyens élastiques maintenant lesdits blocs l'un contre l'autre, et la position de l'extrémité du revêtement céramique reste constante par rapport à la toile, quel que soit l'angle de réglage.The block is movable on the profiled block under the action of a motor engaged with the pivoting block, elastic means holding said blocks against each other, and the position of the end of the ceramic coating remains constant by relative to the canvas, whatever the angle of adjustment.

Avantageusement les moyens élastiques sont constitués d'un clip ou d'un étrier métallique en forme de U.Advantageously, the elastic means consist of a metal clip or U-shaped stirrup.

Selon une variante de réalisation l'invention consiste en un dispositif pour la mise en oeuvre dudit procédé dans lequel l'élément d'égouttage constitué d'un revêtement céramique est monté sur une pièce profilée adaptée à une table de formation d'une machine à papier, la pièce profilée étant un bloc déformable présentant un profil extrudé monobloc, dont la partie inférieure est fixe vis-à-vis de la table de formation et dont la partie supérieure pivote légèrement pour donner en continu un angle variable du revêtement céramique par rapport à la toile recevant la suspension fibreuse.According to an alternative embodiment, the invention consists of a device for implementing said method in which the draining element consisting of a ceramic coating is mounted on a profiled part suitable for a training table of a paper, the profiled part being a deformable block having a one-piece extruded profile, the lower part of which is fixed with respect to the forming table and the upper part of which swivels slightly to continuously give a variable angle of the ceramic coating relative to to the canvas receiving the fibrous suspension.

Le bloc est déformable sous l'action d'un moteur agissant sur la partie supérieure du bloc.The block is deformable under the action of a motor acting on the upper part of the block.

Selon une caractéristique particulière de l'invention, la partie active du moteur est une enceinte déformable actionnée par un dispositif thermodilatable ou un vérin mécanique, ou encore c'est une crémaillère se déplaçant le long d'un élément fixe sous l'action d'un vérin également actionné par un dispositif thermodilatable.According to a particular characteristic of the invention, the active part of the motor is a deformable enclosure actuated by a thermodilatable device or a mechanical jack, or else it is a rack moving along a fixed element under the action of a cylinder also actuated by a thermodilatable device.

Un calculateur de contrôle est raccordé aux moteurs des éléments d'égouttage, aux caisses humides et aux caisses aspirantes ainsi qu'à des détecteurs de concentration de la suspension fibreuse.A control computer is connected to the motors of the drip elements, to the wet boxes and to the suction boxes as well as to concentration sensors of the fibrous suspension.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui va suivre en référence aux dessins annexés qui représentent :Other characteristics and advantages of the invention will emerge from the description which follows with reference to the appended drawings which represent:

Figure 1, une vue schématique en élévation d'une table de formation d'une machine à papier.Figure 1, a schematic elevational view of a training table of a paper machine.

Figure 2, une vue en coupe à plus grande échelle d'un profil standard d'un élément d'égouttage.Figure 2, a sectional view on a larger scale of a standard profile of a drip element.

Figures 3 à 5, des vues en coupe à plus grande échelle d'éléments d'égouttage selon l'invention dans trois variantes de réalisation.Figures 3 to 5, enlarged sectional views of drip elements according to the invention in three alternative embodiments.

Figures 6a, 6b, des vues schématiques de variantes de versions hydrauliques du moteur d'un élément d'égouttage.Figures 6a, 6b, schematic views of alternative hydraulic versions of the motor of a drip element.

Figure 7, une vue schématique d'une version mécanique du moteur d'un élément d'égouttage.Figure 7, a schematic view of a mechanical version of the motor of a drip element.

Figure 8, une vue à plus grande échelle d'une crémaillère dudit élément moteur.Figure 8, an enlarged view of a rack of said motor element.

Figure 9, une vue schématique d'une table de formation de machine à papier avec son calculateur de contrôle.Figure 9, a schematic view of a paper machine training table with its control computer.

La figure 1 illustre le profil classique d'une table de formation d'une machine à papier dans laquelle une toile sans fin 5 tourne en continu entre un rouleau de tête 2 et un rouleau entraîneur 3 en passant alternativement au-dessus et au-dessous de rouleaux de retour 4 qui assurent son guidage et sa tension. Dans le sens de progression de la toile matérialisé par la flèche, la toile est maintenue par une succession d'équipements à savoir un marbre d'entrée 6, une série de caissons d'éléments d'égouttage désignés dans leur ensemble par la référence 1, des caisses humides 7, des caisses aspirantes 8 entres lesquelles s'intercale un rouleau égoutteur 9 et enfin un cylindre aspirant 20 en amont du rouleau entraîneur 3.FIG. 1 illustrates the conventional profile of a forming table of a paper machine in which an endless cloth 5 rotates continuously between a head roller 2 and a driving roller 3 passing alternately above and below return rollers 4 which ensure its guidance and its tension. In the direction of progression of the canvas materialized by the arrow, the canvas is maintained by a succession of equipment, namely an entry marble 6, a series of boxes of draining elements designated as a whole by the reference 1 , wet boxes 7, suction boxes 8 between which a drip roller 9 is inserted and finally a suction cylinder 20 upstream of the driving roller 3.

On a représenté à la figure 2 un profil standard d'élément d'égouttage 1 dans lequel on peut reconnaître un bloc 10 servant de support à un revêtement supérieur 11 en céramique, bloc qui est profilé à sa partie inférieure pour s'adapter à un caisson de maintien non représenté. On voit que la face supérieure 12 du revêtement 11 fait un angle α - dans le cas présent de l'ordre de 4° - avec la toile sans fin 5.FIG. 2 shows a standard profile of a drip element 1 in which one can recognize a block 10 serving as a support for an upper covering 11 made of ceramic, a block which is profiled at its lower part to adapt to a holding box not shown. It can be seen that the upper face 12 of the covering 11 forms an angle α - in the present case of the order of 4 ° - with the endless cloth 5.

La figure 3a montre un exemple d'élément d'égouttage 1 selon l'invention dans lequel les mêmes pièces sont désignées par les mêmes références. Cette fois le bloc 10 servant de support au revêtement céramique 11 repose sur un second bloc profilé 13 pouvant être installé sur le caisson de maintien et qui est donc fixe vis-à-vis de la table de formation. Le bloc 10 peut pivoter par rapport à ce second bloc 13 grâce à une articulation 14 localisée sur le côté. Chacun des blocs (10, 13) dispose d'une échancrure latérale 15 servant de logement à un jonc 16 de blocage d'un clip 17 - sorte de lame ressort qui maintient les blocs appliqués l'un contre l'autre.FIG. 3a shows an example of a draining element 1 according to the invention in which the same parts are designated by the same references. This time the block 10 serving as a support for the ceramic coating 11 rests on a second profiled block 13 which can be installed on the holding box and which is therefore fixed with respect to the training table. The block 10 can pivot relative to this second block 13 thanks to an articulation 14 located on the side. Each of the blocks (10, 13) has a lateral notch 15 serving as a housing for a ring 16 for blocking a clip 17 - a sort of spring blade which holds the blocks applied against each other.

Un moteur 18 reposant sur le bloc 13, et en prise avec le bloc pivotant 10 peut imprimer à ce dernier une légère rotation autour de l'articulation 14, qui provoque la modification de l'angle de la surface 12 du revêtement céramique 11 par rapport à la toile.A motor 18 resting on the block 13, and in engagement with the pivoting block 10 can impart to the latter a slight rotation around the articulation 14, which causes the modification of the angle of the surface 12 of the ceramic coating 11 relative to to the canvas.

La variante de la figure 3b diffère en ce que l'articulation 14 est remplacée par un profil particulier du bloc 13 qui présente une goulotte 34 aux parois arrondies à l'intérieur de laquelle peut coulisser une jambe 35 qui fait partie du bloc 10. Le moteur 18 peut donc modifier l'angle α en écartant (à gauche sur la figure) le bloc 13, puisque la jambe 35 peut coulisser dans la goulotte de guidage 34.The variant of FIG. 3b differs in that the articulation 14 is replaced by a particular profile of the block 13 which has a chute 34 with rounded walls inside which can slide a leg 35 which makes part of the block 10. The motor 18 can therefore modify the angle α by spreading (on the left in the figure) the block 13, since the leg 35 can slide in the guide trough 34.

Quel que soit le mode d'articulation, la position de l'extrémité A du revêtement céramique reste constante par rapport à la toile, quel que soit I'angle α de réglage.Whatever the mode of articulation, the position of the end A of the ceramic coating remains constant with respect to the fabric, whatever the angle α of adjustment.

Les figures 4 et 5 présentent des variantes de réalisation du dispositif représenté à la figure 3.Figures 4 and 5 show alternative embodiments of the device shown in Figure 3.

Dans le cas de la figure 4, les blocs 10 et 13 ménagent entre eux une alvéole profilée 19 à l'intérieur de laquelle un étrier métallique 21 en forme de U, fait ressort et assure la liaison entre les deux blocs.In the case of FIG. 4, the blocks 10 and 13 form between them a profiled cell 19 inside which a metal stirrup 21 in the shape of a U, comes out and ensures the connection between the two blocks.

Un élément moteur 18 est logé entre les branches de l'étrier 21 et, comme dans le cas précédent, il peut imprimer au bloc 10 une légère rotation vis-à-vis du bloc fixe 13 qui modifie l'angle du revêtement céramique 11 par rapport à la toile.A motor element 18 is housed between the branches of the stirrup 21 and, as in the previous case, it can give the block 10 a slight rotation with respect to the fixed block 13 which modifies the angle of the ceramic coating 11 by compared to the canvas.

A la figure 5 le bloc 10 est déformable et présente un profil extrudé monobloc comportant les réservations nécessaires à la fixation du revêtement céramique 11, ainsi qu'à la fixation sur les supports du caisson qui maintiennent les éléments d'égouttage. Il dispose aussi d'une alvéole centrale 19 renfermant un moteur 18 qui agit de façon équivalente en faisant pivoter légèrement la partie supérieure du bloc 10 tandis que la partie inférieure reste fixe vis-à-vis de la table de formation.In FIG. 5, the block 10 is deformable and has a one-piece extruded profile comprising the reservations necessary for fixing the ceramic coating 11, as well as for fixing to the supports of the box which hold the draining elements. It also has a central cell 19 containing a motor 18 which acts in an equivalent way by slightly pivoting the upper part of the block 10 while the lower part remains fixed with respect to the training table.

Pour ces deux variantes, on peut si nécessaire, rajouter un clip latéral du genre de celui décrit en référence à la figure 3.For these two variants, you can add a side clip like the one described with reference to Figure 3 if necessary.

L'élément moteur 18 peut être réalisé en version hydraulique ou en version mécanique.The motor element 18 can be produced in a hydraulic version or in a mechanical version.

Pour la version hydraulique, la figure 6a montre que la partie active du moteur est une enceinte déformable 22 reliée par un capillaire 23 à un vérin 24 actionné par un dispositif thermodilatable 25 à l'encontre de la force d'un petit ressort de rappel 26.For the hydraulic version, FIG. 6a shows that the active part of the motor is a deformable enclosure 22 connected by a capillary 23 to a jack 24 actuated by a thermodilatable device 25 against the force of a small return spring 26 .

En variante de réalisation, l'enceinte déformable 22 est réliée à un vérin hydraulique 24 actionné par un vérin mécanique, non représenté, lui-même par un moteur électrique.In an alternative embodiment, the deformable enclosure 22 is connected to a hydraulic cylinder 24 actuated by a mechanical cylinder, not shown, itself by an electric motor.

Dans l'autre cas de figure représenté à la figure 6b, le capillaire 23 aboutit à une capacité de fluide thermodilatable 25 soumise à une résistance de chauffage 27.In the other case shown in FIG. 6b, the capillary 23 leads to a capacity of thermodilatable fluid 25 subjected to a heating resistor 27.

Dans les deux cas, un calculateur de contrôle 28 pilote les deux capacités thermodilatables, le fluide hydraulique à l'enceinte déformable 22 étant contrôlé en pression (figure 6a), ou en température (figure 6b).In both cases, a control computer 28 controls the two thermodilatable capacities, the hydraulic fluid at the deformable enclosure 22 being controlled by pressure (FIG. 6a), or by temperature (FIG. 6b).

En ce qui concerne la version mécanique du moteur, elle peut être réalisée comme le montre la figure 7. L'élément mobile du moteur est une crémaillère 29 qui se déplace le long d'un élément fixe 30 sous l'action d'un vérin 31 relié par un capillaire 23 à un actionneur 25 du genre décrit précédemment. Un calculateur de contrôle 28 pilote également cet actionneur. L'élément fixe est dentelé intérieurement pour accrocher la crémaillère. En variante, la crémaillère 29 pourrait se déplacer le long de l'élément fixe 30 sous l'action d'une vis sans fin actionnée par un moteur électrique ou à air comprimé.As regards the mechanical version of the motor, it can be produced as shown in FIG. 7. The mobile element of the motor is a rack 29 which moves along a fixed element 30 under the action of a jack 31 connected by a capillary 23 to an actuator 25 of the kind described above. A control computer 28 also controls this actuator. The fixed element is internally serrated to hang the rack. As a variant, the rack 29 could move along the fixed element 30 under the action of an endless screw actuated by an electric or compressed air motor.

Dans la variante de la figure 8, l'élément fixe 30 n'est pas dentelé mais des billes 32 assurent le blocage de la crémaillère 29. Les crémaillères représentées sont doubles mais elles pourraient être simples, selon une autre forme d'exécution.In the variant of FIG. 8, the fixed element 30 is not serrated but balls 32 ensure the locking of the rack 29. The racks shown are double but they could be simple, according to another embodiment.

Le procédé de contrôle de l'égouttage de la suspension fibreuse sur la table de formation est illustré à la figure 9.The method for controlling the drainage of the fibrous suspension on the forming table is illustrated in FIG. 9.

Le calculateur de contrôle 28 reçoit des informations, d'une part sur l'angle des revêtements céramiques par rapport à la toile 5, pour l'ensemble des éléments d'égouttage 1, d'autre part sur le contrôle du vide aussi bien au niveau des caisses humides 7 que des caisses aspirantes 8 en amont du rouleau égoutteur 9. Le calculateur reçoit aussi des détecteurs 33, de part et d'autre desdites caisses, un signal représentatif des mesures continues en ces deux endroits de la concentration de suspension fibreuse sur la toile de formation. La comparaison du signal de mesure à un signal de référence aboutit à la formation d'un signal de comparaison, en fonction duquel est assuré le réglage des angles des éléments d'égouttage et des vannes contrôlant le vide des caisses aspirantes. Il est avantageux que le signal de référence puisse prendre une valeur quelconque comprise dans une plage déterminée afin que le réglage des éléments d'égouttage et des vannes de vide ne soit modifié que pour une variation minimale de la concentration de la suspension fibreuse sur la toile.The control computer 28 receives information, on the one hand on the angle of the ceramic coatings with respect to the fabric 5, for all of the draining elements 1, on the other hand on the vacuum control both at level of the wet boxes 7 as of the suction boxes 8 upstream of the drip roller 9. The computer also receives detectors 33, on either side of said boxes, a signal representative of the continuous measurements at these two places of the concentration of fibrous suspension on the forming fabric. The comparison of the measurement signal with a reference signal results in the formation of a comparison signal, on the basis of which the angles of the drip elements and of the valves controlling the vacuum of the suction boxes are adjusted. It is advantageous that the reference signal can take any value within a determined range so that the setting of the drip elements and the vacuum valves is only changed for a minimum variation of the concentration of the fibrous suspension on the fabric .

On assure ainsi un réglage en continu de l'épair d'une feuille de papier produite en continu par une machine à papier.This ensures continuous adjustment of the air of a sheet of paper produced continuously by a paper machine.

Claims (15)

Procédé de contrôle et de réglage de l'égouttage d'une suspension fibreuse sur une table de formation d'une machine à papier comportant une toile fine qui se déroule en continu et reçoit ladite suspension distribuée par une caisse de tête, des éléments d'égouttage disposés sous la toile assurant un premier égouttage de la suspension fibreuse, suivis de caisses humides et de caisses aspirantes qui complètent l'égouttage caractérisé en ce que on assure le réglage en continu des angles de la surface (12) des éléments d'égouttage (1) par rapport à la surface de la toile (5) pendant la première phase de formation de la feuille, en fonction du contrôle des niveaux de vide dans les caisses aspirantes (7) et dans les caisses humides (8) en aval desdits éléments d'égouttage, et en fonction de la mesure de la concentration de la suspension fibreuse sur la toile de fabrication.Method for controlling and adjusting the drainage of a fibrous suspension on a forming table of a paper machine comprising a fine fabric which unrolls continuously and receives said suspension distributed by a headbox, elements of drainage arranged under the fabric ensuring a first drainage of the fibrous suspension, followed by wet boxes and suction boxes which complete the drainage, characterized in that the angles of the surface (12) of the drainage elements are continuously adjusted (1) relative to the surface of the fabric (5) during the first phase of sheet formation, depending on the control of the vacuum levels in the suction boxes (7) and in the wet boxes (8) downstream of said draining elements, and according to the measurement of the concentration of the fibrous suspension on the fabric of manufacture. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 dans lequel l'élément d'égouttage constitué d'un revêtement céramique est monté sur une pièce profilée adaptée à une table de formation d'une machine à papier caractérisé en ce que la pièce profilée est un bloc (10) déplaçable par rapport à un bloc profilé (13) lui-même fixe vis-à-vis de la table de formation pour donner en continu un angle variable au revêtement céramique (11) par rapport à la toile (5) recevant la suspension fibreuse.Device for implementing the method according to claim 1, in which the draining element consisting of a ceramic coating is mounted on a profiled part adapted to a forming table of a paper machine, characterized in that the part profiled is a block (10) movable relative to a profiled block (13) itself fixed with respect to the forming table to continuously give a variable angle to the ceramic coating (11) relative to the canvas ( 5) receiving the fibrous suspension. Dispositif selon la revendication 2 caractérisé en ce que le bloc (10) pivote sur le bloc profilé (13) sous l'action d'un moteur (18) en prise avec le bloc pivotant et en ce que des moyens élastiques (17, 21) maintiennent lesdits blocs l'un contre l'autre.Device according to claim 2 characterized in that the block (10) pivots on the profiled block (13) under the action of a motor (18) engaged with the pivoting block and in that elastic means (17, 21 ) hold said blocks against each other. Dispositif selon la revendication 3 caractérisé en ce que un moyen élastique est constitué d'un clip (17) bloqué par des joncs (16) prévus sur chacun des blocs (10, 13).Device according to claim 3 characterized in that an elastic means consists of a clip (17) blocked by rods (16) provided on each of the blocks (10, 13). Dispositif selon la revendication 3 caractérisé en ce que un moyen élastique est constitué d'un étrier métallique (21) en forme de U.Device according to claim 3 characterized in that an elastic means consists of a metal stirrup (21) in the shape of a U. Dispositif selon les revendications 3 et 5 caractérisé en ce que le moteur (18) est disposé dans l'alvéole (19) renfermant l'étrier (21), et entre les branches dudit étrier.Device according to claims 3 and 5 characterized in that the motor (18) is arranged in the cell (19) containing the stirrup (21), and between the branches of said stirrup. Dispositif pour la mise en oeuvre du procédé selon la revendication 1 dans lequel l'élément d'égouttage constitué d'un revêtement céramique est monté sur une pièce profilée adaptée à une table de formation d'une machine à papier caractérisé en ce que la pièce profilée est un bloc déformable (10) présentant un profil extrudé monobloc, dont la partie inférieure est fixe vis-à-vis de la table de formation et dont la partie supérieure pivote légèrement pour donner en continu un angle variable du revêtement céramique (11) par rapport à la toile (5) recevant la suspension fibreuse.Device for implementing the method according to claim 1, in which the draining element consisting of a ceramic coating is mounted on a profiled part adapted to a forming table of a paper machine, characterized in that the part profiled is a deformable block (10) having a one-piece extruded profile, the lower part of which is fixed with respect to the forming table and the upper part of which swivels slightly to continuously give a variable angle of the ceramic coating (11) relative to the fabric (5) receiving the fibrous suspension. Dispositif selon la revendication 7 caractérisé en ce que le bloc (10) à profil extrudé dispose d'une alvéole centrale (19) renfermant un moteur (18) agissant sur la partie supérieure du bloc.Device according to claim 7, characterized in that the block (10) with an extruded profile has a central cell (19) containing a motor (18) acting on the upper part of the block. Dispositif selon la revendication 3 caractérisé en ce que la partie active du moteur (18) est une enceinte déformable (22) reliée à un vérin (24) actionné par un dispositif thermodilatable (25).Device according to Claim 3, characterized in that the active part of the motor (18) is a deformable enclosure (22) connected to a jack (24) actuated by a thermodilatable device (25). Dispositif selon la revendication 3 caractérisé en ce que la partie active du moteur (18) est une enceinte déformable (22) reliée à un vérin hydraulique (24) actionné par un vérin mécanique lui-même mû par un moteur électrique.Device according to claim 3 characterized in that the active part of the motor (18) is a deformable enclosure (22) connected to a hydraulic cylinder (24) actuated by a mechanical cylinder itself driven by an electric motor. Dispositif selon la revendication 3 caractérisé en ce que la partie active du moteur (18) est une enceinte déformable (22) reliée à une capacité de fluide thermodilatable (25) soumise à une résistance de chauffage (27).Device according to Claim 3, characterized in that the active part of the motor (18) is a deformable enclosure (22) connected to a capacity of thermodilatable fluid (25) subjected to a heating resistor (27). Dispositif selon la revendication 3 caractérisé en ce que la partie active du moteur (18) est une crémaillère (29) se déplaçant le long d'un élément fixe (30) sous l'action d'un vérin (31) relié à un actionneur à fluide dilatable (25).Device according to claim 3 characterized in that the active part of the motor (18) is a rack (29) moving along a fixed element (30) under the action of a jack (31) connected to an actuator with expandable fluid (25). Dispositif selon la revendication 3 caractérisé en ce que la partie active du moteur (18) est une crémaillère (29) se déplaçant le long d'un élément fixe (30) sous l'action d'une vis sans fin actionnée par un moteur électrique ou à air comprimé.Device according to claim 3 characterized in that the active part of the motor (18) is a rack (29) moving along a fixed element (30) under the action of a worm screw actuated by an electric motor or compressed air. Dispositif selon les revendications 2 et 3 caractérisé en ce que un calculateur de contrôle (28) est raccordé d'une part aux moteurs (18) des éléments d'égouttage (1), ainsi qu'aux caisses humides (7) et aux caisses aspirantes (8), d'autres part à des détecteurs (33) de concentration de la suspension fibreuse placés de part et d'autre desdites caisses.Device according to claims 2 and 3 characterized in that a control computer (28) is connected on the one hand to the motors (18) of the drip elements (1), as well as to the wet boxes (7) and to the boxes suction (8), on the other hand to sensors (33) for concentration of the fibrous suspension placed on either side of said boxes. Dispositif selon la revendication 3 caractérisé en ce que la position de l'extrémité A du revêtement céramique 11 reste constante par rapport à la toile 5, quel que soit l'angle α de réglage.Device according to claim 3 characterized in that the position of the end A of the ceramic coating 11 remains constant relative to the fabric 5, whatever the angle α of adjustment.
EP94402821A 1993-12-16 1994-12-08 Process for controlling and regulating the drainage of a fibrous suspension in the forming section of a paper machine and apparatus for the application of the process Withdrawn EP0659933A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9315153 1993-12-16
FR9315153A FR2714088B1 (en) 1993-12-16 1993-12-16 Method for controlling and adjusting the drainage of a fibrous suspension on a forming table of a paper machine and device for implementing the method.

Publications (1)

Publication Number Publication Date
EP0659933A1 true EP0659933A1 (en) 1995-06-28

Family

ID=9454014

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94402821A Withdrawn EP0659933A1 (en) 1993-12-16 1994-12-08 Process for controlling and regulating the drainage of a fibrous suspension in the forming section of a paper machine and apparatus for the application of the process

Country Status (6)

Country Link
EP (1) EP0659933A1 (en)
JP (1) JPH0827690A (en)
CA (1) CA2137979A1 (en)
FI (1) FI945939A (en)
FR (1) FR2714088B1 (en)
NO (1) NO944836L (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040020A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Bar arrangement for machine for producing fibrous web, particularly paper or cardboard web, has stationary guide device which comprises multiple spaced and stationary C-shaped guide units
DE102008040021A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Ledge arrangement for use in e.g. paper sheet production machine, has guiding units surrounding lower area of ledges by guiding arms, and rubber pads arranged at inner side of respective guiding arm for exerting guiding effect on ledges
DE102008040032A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Strip arrangement for a machine for producing a fibrous web
DE102008040016A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Ledge arrangement for use in e.g. paper sheet production machine, has fixed guiding device fixed at fixed structure or at frame and comprises multiple fixed guiding units, which are connected with ledges via spring units
DE102008040025A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Bar arrangement for machine for producing fibrous web, particularly paper or cardboard web, has stationary guide device which comprises two stationary guide strands

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5220278B2 (en) 2006-01-27 2013-06-26 任天堂株式会社 Game device and handwriting input program

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497420A (en) * 1967-01-30 1970-02-24 Huyck Corp Continuously variable hydrofoils for papermaking wires
FR2012871A1 (en) * 1968-07-12 1970-03-27 Voith
GB2194257A (en) * 1986-08-20 1988-03-02 Voith Gmbh J M Support unit for endless wire in papermaking machine
CH672155A5 (en) * 1986-12-01 1989-10-31 Leopold Sonntag Paper-making water extraction film - has pressure control to eliminate random vacuum at entry
DE4019921A1 (en) * 1990-06-22 1992-01-09 Voith Gmbh J M STATIONARY SUPPORT DEVICE

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3497420A (en) * 1967-01-30 1970-02-24 Huyck Corp Continuously variable hydrofoils for papermaking wires
FR2012871A1 (en) * 1968-07-12 1970-03-27 Voith
GB2194257A (en) * 1986-08-20 1988-03-02 Voith Gmbh J M Support unit for endless wire in papermaking machine
CH672155A5 (en) * 1986-12-01 1989-10-31 Leopold Sonntag Paper-making water extraction film - has pressure control to eliminate random vacuum at entry
DE4019921A1 (en) * 1990-06-22 1992-01-09 Voith Gmbh J M STATIONARY SUPPORT DEVICE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008040020A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Bar arrangement for machine for producing fibrous web, particularly paper or cardboard web, has stationary guide device which comprises multiple spaced and stationary C-shaped guide units
DE102008040021A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Ledge arrangement for use in e.g. paper sheet production machine, has guiding units surrounding lower area of ledges by guiding arms, and rubber pads arranged at inner side of respective guiding arm for exerting guiding effect on ledges
DE102008040032A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Strip arrangement for a machine for producing a fibrous web
DE102008040016A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Ledge arrangement for use in e.g. paper sheet production machine, has fixed guiding device fixed at fixed structure or at frame and comprises multiple fixed guiding units, which are connected with ledges via spring units
DE102008040025A1 (en) 2008-06-30 2009-12-31 Voith Patent Gmbh Bar arrangement for machine for producing fibrous web, particularly paper or cardboard web, has stationary guide device which comprises two stationary guide strands
US8168042B2 (en) 2008-06-30 2012-05-01 Voith Patent Gmbh Bar arrangement for a machine for the production of a fibrous web

Also Published As

Publication number Publication date
NO944836D0 (en) 1994-12-14
NO944836L (en) 1995-06-19
CA2137979A1 (en) 1995-06-17
JPH0827690A (en) 1996-01-30
FR2714088A1 (en) 1995-06-23
FR2714088B1 (en) 1996-02-16
FI945939A0 (en) 1994-12-16
FI945939A (en) 1995-06-17

Similar Documents

Publication Publication Date Title
CA2404219C (en) Method and continuous production line of plastic tubes with bi-axial drawing, and resulting plastic tube
EP0659933A1 (en) Process for controlling and regulating the drainage of a fibrous suspension in the forming section of a paper machine and apparatus for the application of the process
FR2488628A1 (en) DEVICE AND METHOD FOR FINISHING THE LIP OF AN ARRIVAL BOX OF A PAPER MACHINE
FR2846643A1 (en) Reel for plastics film production has cylinder with spaced supports to control cylinder deformation
CA2643676A1 (en) Device for maintaining creping of textile or thread fibres during subsequent setting treatment
EP0334948B1 (en) Transfer device and compression and introduction device for a needling machine
FR2578242A1 (en) APPARATUS FOR THE MANUFACTURE OF GLASS FIBER CUTTING YARNS
FR2629106A1 (en) SEALING HEAD FOR A STEAM CONTINUOUS TREATMENT ENCLOSURE FOR TEXTILE THREADS
FR2541913A1 (en) APPARATUS FOR COATING PAPER SHEET
EP0122835B1 (en) Method and apparatus for retaining a textile article during treatment
EP1323853B1 (en) Method and apparatus for crimping yarns
FR2864797A1 (en) Metallic tape leveling machine for use in metallurgy field, has two leveling equipments with respective active cylinders, where machine is stopped while placing equipments in leveling position, when synchronous speed of tape is reached
CH618751A5 (en)
FR2510153A1 (en) PAPER MACHINE WITH CANVAS GUIDING ARCHED IN ITS WET AREA
FR2655904A1 (en) System of the &#34;cable&#34; type for cutting solid bodies
FR2663391A1 (en) SEAL FOR PRESSURE ENCLOSURE, IN PARTICULAR FOR MACHINE FOR MANUFACTURING CARDBOARD.
FR2491354A1 (en) SHEET COATING DEVICE
BE1027608B1 (en) MACHINE AND PROCESS FOR SHAPING PASSONS
EP0216656B1 (en) Guiding device for band material, in particular for a metal strip treatment installation
FR2486973A1 (en) IMPROVEMENTS IN MACHINES FOR CRUSHING AND WASHING FABRICS
EP2041509A2 (en) Drum device and flexible belts
FR2574957A1 (en) METHOD AND DEVICE FOR CONTROLLING AND REGULATING THE THICKNESS OF A THIN METAL COATING DEPOSITED ON A SUPPORT
FR2824505A1 (en) DEVICE AND METHOD FOR GRAINING THE SURFACE OF A WORK IN THERMOPLASTIC MATERIAL
FR2903767A1 (en) Drum device for e.g. air-drier, has flexible belts each passing over guide rollers, where each roller is pivotably mounted around axis perpendicular to rotational axis of drum and is provided in median plane perpendicular to axis of roller
WO1992020860A1 (en) Process and device for drying a web of paper, cardboard and similar materials

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19951106

17Q First examination report despatched

Effective date: 19961120

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19980106