EP0418445A1 - Apparatus for feeding a pasty mixture - Google Patents

Apparatus for feeding a pasty mixture Download PDF

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Publication number
EP0418445A1
EP0418445A1 EP89402582A EP89402582A EP0418445A1 EP 0418445 A1 EP0418445 A1 EP 0418445A1 EP 89402582 A EP89402582 A EP 89402582A EP 89402582 A EP89402582 A EP 89402582A EP 0418445 A1 EP0418445 A1 EP 0418445A1
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EP
European Patent Office
Prior art keywords
outlet
distribution box
inlet
pasty mixture
nozzle
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Withdrawn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
EP89402582A
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German (de)
French (fr)
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.)
Semti A Responsabilite Ltee Ste
S E M T I SARL
Original Assignee
Semti A Responsabilite Ltee Ste
S E M T I SARL
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 to FR8806480A priority Critical patent/FR2631353A1/en
Application filed by Semti A Responsabilite Ltee Ste, S E M T I SARL filed Critical Semti A Responsabilite Ltee Ste
Priority to EP89402582A priority patent/EP0418445A1/en
Priority to CA000614141A priority patent/CA1327471C/en
Priority to US07/422,050 priority patent/US5030326A/en
Publication of EP0418445A1 publication Critical patent/EP0418445A1/en
Withdrawn legal-status Critical Current

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    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F1/06—Regulating pulp flow
    • 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
    • D21F1/08—Regulating consistency

Definitions

  • the invention relates to a device for supplying a pasty mixture, such as paper pulp, in order to form a sheet of pulp through a nozzle mounted at the outlet of a distribution box.
  • a pasty mixture such as paper pulp
  • Devices of this type are already known, intended for the distribution and the formation of fibrous webs or not by means of a pasty mixture, according to a process called "by the liquid route" because the humidity is high, by example of the order of 99.4% for paper pulp, in which the concentration of the mixture is adjustable; this concentration is adjusted upstream of the supply beam of a "box” for distributing the mixture to a nozzle bringing the dough onto one or between two drum (s) carrying drip sheets; the grammage of the sheet is adjusted by the sectional control of the dough flow rate made by spreading the lips more or less locally from the nozzle of the nozzle mounted at the outlet of the distribution box; it results from the change in speed of the jet at constant concentration, the control of the desired grammage, but also a change in the resistance vector direction machine / cross direction.
  • the object of the invention is to remedy this drawback and also to create a device for supplying a pasty mixture which is both simple, reliable, inexpensive, and easy to implement.
  • the invention relates to a device for supplying a pasty mixture, such as paper pulp, with a view to forming a sheet of pulp through at least one nozzle mounted at the outlet of a distribution box.
  • a device for supplying a pasty mixture such as paper pulp
  • each circuit comprises a liquid supply channel and a concentrated paste supply channel each provided with a flow control valve and connected downstream of these valves by a mixer comprising an outlet which is itself connected to an inlet of the distribution box, in that the distribution box comprises ejection channels delimited by longitudinal partitions, and in that each circuit is in correspondence with an ejection channel.
  • the device allows independent control, in sections, in the cross direction of the ejection by the nozzle, of the concentration and of the flow, and the grammage is no longer the exclusive consequence of the adjustment of the flow.
  • the device shown in Figure 1 is of the two-circuit type and intended to supply a mixture of pasty fibers, more precisely pulp, by means of one or more jets, the interval between two rollers of a paper-making machine, so as to form by means of these two rollers carrying webs drip formation, a sheet of dough which will then be dried to form a sheet of paper.
  • This device here comprises a distribution box 1 for dough, provided with dough outlet nozzles 2 (and in any case at least one nozzle), the ejection nozzles 21 of which are kept fixed in the immediate vicinity of the interval between the two rollers 3 and the extension of the longitudinal axis of which passes through this interval, for example substantially at equal distance from these two rollers 3.
  • this distribution box 1 open one or more bundles of supply of pasty mixture, each consisting one or more circuits 4 for supplying a pasty mixture each provided with an injector-mixer 5 of concentrated paste and of dilution liquid and of two routes 6, 7 for bringing this paste and this liquid respectively to the injector- mixer.
  • the device shown in the drawings shows a single distribution box 1 provided with a single outlet nozzle 2 and supplied by a two-circuit supply bundle 4, this device may include several distribution boxes arranged side by side and each provided with several nozzles aligned in a direction extending parallel to the respective longitudinal axes of the two drums 3. Similarly, in the distribution box 1 can open several bundles of supply circuits also aligned in a direction extending parallel to the same longitudinal axes.
  • the distribution box 1 and the outlet (s) 51 of the injector-mixers 5 of each circuit 4 for supplying a pasty mixture are connected by conduits 40 opening into inputs respectively provided at the upper part and at the lower part. of the distribution box 1, these conduits 40 possibly being in several segments connected by flanges 41; the injector-mixers 5 comprise, in their face opposite to that of their outlet (s) 51 for one or more pipes (40) for supplying pasty mixture, an inlet 52 into which a pipe 60 of concentrated pulp supply belonging to the pulp supply path 6, while the pipe 70 for supplying dilution liquid belonging to the liquid supply path 7 opens into the injector-mixer, in an orthogonal direction, through an inlet 53 for the liquid.
  • a valve 61 for adjusting concentrated paste is inserted, and into the way 7 for supplying dilution liquid coming from a liquid supply device, is inserted a valve 71 for adjusting dilution rate.
  • the movable members of the valves 61 for adjusting the dough flow rate and the valves 71 for adjusting the dilution liquid flow rate can be connected to a manual control means, or to an automatic control means such as a controlled computer itself. manually or automatically depending on instructions and information sent from measuring devices by any means of transmission known per se (not shown in the drawings). This information and these instructions relate, in the present case, to the profile control of the weight and resistance characteristics of the sheet obtained in the direction of distribution and in the cross direction thereof.
  • the injector-mixers 5 arranged downstream of the valves have a generally substantially frustoconical shape (FIG. 2), for example made up of two truncated cones 54, 55 placed side by side with different conicities but of the same direction, the diameter of which decreases from their base where finds the inlet 52 for the concentrated dough up to that where the outlet 51 for the pasty mixture is located; the inlet 53 for the dilution liquid is located near the inlet 52 for the paste, but its central axis is orthogonal to that of the first, that is to say to the longitudinal axis of the injector -mixer; the inlet 52 for the dough is provided with an injection nozzle 56 whose longitudinal position of the nozzle 561 is adjustable in the injector-mixer over a certain range around the central region thereof; however, the nozzle 561 of the nozzle always remains in front of a perforated grid 57 extending transversely in the injector-mixer and determining, behind it (i.e.
  • a second perforated grid 58 extends in front of the first and of the nozzle 561 of concentrated dough inlet, parallel to this first perforated grid 57, that is to say transversely to the injector-mixer, determining forward a pasty mixture outlet chamber into which the outlet pipe opens.
  • the two inlets 52, 53 and the outlet 51 are provided with a flange.
  • this tongue 11 In the outlet region of the distribution box 1, behind the nozzles 2, extends longitudinally a forming tongue 11 arranged horizontally (FIG. 3), intended to promote the good distribution of the pasty mixture, by turbulence; this tongue 11 has a symmetrical upper face and lower face, having in longitudinal section a sawtooth profile whose teeth have a slightly inclined rear edge, a very inclined front edge, and a rounded bottom.
  • this forming tab 11 the distribution box is partitioned (FIG.
  • each circuit of the supply beam corresponds to an ejection channel 12 created by partitioning the cross section of the region Release ;
  • the partitions 13 therefore extend longitudinally in this zone, that is to say also in the direction of ejection, vertically, until the end of the forming tab, or beyond forwards if necessary , the calculation can be carried out case by case;
  • these partitions 13 are corrugated at least in their end zone, on the outlet side of the jet, in order to prevent any hydraulic marking in the formation of the sheet.
  • the concentrated paste and the dilution liquid are introduced into the injector-mixers 5 and, from there, the mixture is directed by the supply circuits 4, in the supply box 1; then, from this feed box, the pasty mixture is injected through the nozzles 2 between the two rollers 3, without any hydraulic marking appearing.

Abstract

Apparatus for feeding a pasty mixture, such as papermaking pulp, with a view to forming a sheet of pulp, through at least one nozzle (2) mounted at the exit of a distribution chest (1). The apparatus is characterised in that circuits (4) for feeding pasty mixture open into the distribution chest (1) and each circuit (4) comprises a line (7) for feeding liquid and a line (6) for feeding concentrated pulp, each equipped with a flow control valve (71, 61) and connected downstream of these valves by a mixer (5) comprising an outlet (51), itself connected to an entry of the distribution chest, in that the distribution chest (1) comprises ejection channels bounded by lengthwise partitions, and in that each circuit (4) corresponds to an ejection channel. <IMAGE>

Description

L'invention concerne un dispositif d'alimentation en mélange pâteux, tel que de la pâte à papier, en vue de former une nappe de pâte au travers d'une buse montée en sortie d'une caisse de distribution.The invention relates to a device for supplying a pasty mixture, such as paper pulp, in order to form a sheet of pulp through a nozzle mounted at the outlet of a distribution box.

On connaît déjà des dispositifs de ce type, destinés à la distribution et à la formation de nappes fibreuses ou non au moyen d'un mélange pâteux, selon un procédé dit "par voie liquide" parce que le taux d'humidité est élevé, par exemple de l'ordre de 99,4 % pour la pâte à papier, dans lesquels la concentration du mélange est réglable ; cette concentration est réglée en amont du faisceau d'alimentation d'une "caisse" de distribution du mélange à une buse amenant la pâte sur un ou entre deux tambour(s) portant des toiles d'égouttage ; le grammage de la nappe est ajusté par le contrôle par sections du débit de pâte effectué en écartant localement plus ou moins les lèvres de la buse montée en sortie de la caisse de distribution ; il résulte bien de la modification de vitesse du jet à concentration constante, le contrôle du grammage désiré, mais également une modification du vecteur de résistance sens machine/sens travers.Devices of this type are already known, intended for the distribution and the formation of fibrous webs or not by means of a pasty mixture, according to a process called "by the liquid route" because the humidity is high, by example of the order of 99.4% for paper pulp, in which the concentration of the mixture is adjustable; this concentration is adjusted upstream of the supply beam of a "box" for distributing the mixture to a nozzle bringing the dough onto one or between two drum (s) carrying drip sheets; the grammage of the sheet is adjusted by the sectional control of the dough flow rate made by spreading the lips more or less locally from the nozzle of the nozzle mounted at the outlet of the distribution box; it results from the change in speed of the jet at constant concentration, the control of the desired grammage, but also a change in the resistance vector direction machine / cross direction.

L'invention a pour but de remédier à cet inconvénient et également de créer un dispositif d'alimentation en mélange pâteux qui soit à la fois simple, fiable, peu coûteux, et facile à mettre en oeuvre.The object of the invention is to remedy this drawback and also to create a device for supplying a pasty mixture which is both simple, reliable, inexpensive, and easy to implement.

A cet effet, l'invention concerne un dispositif d'alimentation en mélange pâteux, tel que de la pâte à papier, en vue de former une nappe de pâte au travers d'au moins une buse montée en sortie d'une caisse de distribution, dispositif caractérisé en ce que, dans la caisse de distribution, débouchent des circuits d'alimentation en mélange pâteux, et chaque circuit comporte une voie d'alimentation en liquide et une voie d'alimentation en pâte concentrée munies chacune d'une vanne de réglage de débit et raccordées en aval de ces vannes par un mélangeur comportant une sortie elle-même reliée à une entrée de la caisse de distribution, en ce que la caisse de distribution comporte des chenaux d'éjection délimités par des cloisons longitudinales, et en ce que chaque circuit est en correspondance d'un chenal d'éjection.To this end, the invention relates to a device for supplying a pasty mixture, such as paper pulp, with a view to forming a sheet of pulp through at least one nozzle mounted at the outlet of a distribution box. , device characterized in that, in the distribution box, lead to circuits for supplying pasty mixture, and each circuit comprises a liquid supply channel and a concentrated paste supply channel each provided with a flow control valve and connected downstream of these valves by a mixer comprising an outlet which is itself connected to an inlet of the distribution box, in that the distribution box comprises ejection channels delimited by longitudinal partitions, and in that each circuit is in correspondence with an ejection channel.

Grâce à cela, le dispositif permet le contrôle indépendant, par sections, dans le sens travers de l'éjection par la buse, de la concentration et du débit, et le grammage n'est plus la conséquence exclusive du réglage du débit.Thanks to this, the device allows independent control, in sections, in the cross direction of the ejection by the nozzle, of the concentration and of the flow, and the grammage is no longer the exclusive consequence of the adjustment of the flow.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui va suivre d'une forme de réalisation préférentielle donnée à titre d'exemple non limitatif et illustrée sur les dessins ci-joint dans lesquels :

  • - la figure 1 montre schématiquement un dispositif selon l'invention partiellement coupé, notamment en ce qui concerne sa caisse de distribution,
  • - la figure 2 est une vue schématique d'une forme de réalisation d'un injecteur-mélangeur destiné à équiper un dispositif selon l'invention, représenté partiellement coupé,
  • - la figure 3 est une section longitudinale schématique partielle très agrandie d'une partie de la buse de la caisse de distribution de la figure 2, et
  • - la figure 4 est une section transversale schématique partielle de la buse de la figure 3, selon la ligne IV-IV de cette figure 3.
Other characteristics and advantages of the invention will emerge from the description which follows of a preferred embodiment given by way of nonlimiting example and illustrated in the attached drawings in which:
  • FIG. 1 schematically shows a device according to the invention partially cut, in particular as regards its distribution box,
  • FIG. 2 is a schematic view of an embodiment of an injector-mixer intended to equip a device according to the invention, shown partially cut away,
  • FIG. 3 is a very enlarged partial schematic longitudinal section of part of the nozzle of the distribution box of FIG. 2, and
  • FIG. 4 is a partial schematic cross section of the nozzle of FIG. 3, along the line IV-IV of this FIG. 3.

Le dispositif représenté sur la figure 1 est du type à deux circuits et destiné à alimenter en un mélange de fibres pâteux, plus précisément de la pâte à papier, au moyen d'un ou plusieurs jets, l'intervalle entre deux rouleaux d'une machine de fabrication de papier, de manière à former au moyen de ces deux rouleaux portant des toiles d'égouttage de formation, une nappe de pâte qui sera ensuite séchée en vue de constituer une feuille de papier.The device shown in Figure 1 is of the two-circuit type and intended to supply a mixture of pasty fibers, more precisely pulp, by means of one or more jets, the interval between two rollers of a paper-making machine, so as to form by means of these two rollers carrying webs drip formation, a sheet of dough which will then be dried to form a sheet of paper.

Ce dispositif comporte ici une caisse de distribution 1 de pâte, munie de buses 2 de sortie de pâte (et en tout cas d'au moins une buse) dont les ajutages d'éjection 21 sont maintenus fixes à proximité immédiate de l'intervalle entre les deux rouleaux 3 et dont le prolongement de l'axe longitudinal passe par cet intervalle par exemple sensiblement à égale distance de ces deux rouleaux 3. Dans cette caisse de distribution 1, débouchent un ou plusieurs faisceaux d'alimentation en mélange pâteux, constitués chacun d'un ou plusieurs circuits 4 d'alimentation en mélange pâteux munis chacun d'un injecteur-mélangeur 5 de pâte concentrée et de liquide de dilution et de deux voies 6, 7 pour amener respectivement cette pâte et ce liquide à l'injecteur-mélangeur.This device here comprises a distribution box 1 for dough, provided with dough outlet nozzles 2 (and in any case at least one nozzle), the ejection nozzles 21 of which are kept fixed in the immediate vicinity of the interval between the two rollers 3 and the extension of the longitudinal axis of which passes through this interval, for example substantially at equal distance from these two rollers 3. In this distribution box 1, open one or more bundles of supply of pasty mixture, each consisting one or more circuits 4 for supplying a pasty mixture each provided with an injector-mixer 5 of concentrated paste and of dilution liquid and of two routes 6, 7 for bringing this paste and this liquid respectively to the injector- mixer.

Bien que le dispositif représenté sur les dessins montre une unique caisse de distribution 1 munie d'une unique buse 2 de sortie et alimentée par un faisceau d'alimentation à deux circuits 4, ce dispositif peut comporter plusieurs caisses de distribution disposées côte à côte et munies chacune de plusieurs buses alignées dans une direction s'étendant parallèlement aux axes longitudinaux respectifs des deux tambours 3. De même, dans la caisse de distribution 1 peuvent déboucher plusieurs faisceaux de circuits d'alimentation alignés également dans une direction s'étendant parallèlement aux mêmes axes longitudinaux.Although the device shown in the drawings shows a single distribution box 1 provided with a single outlet nozzle 2 and supplied by a two-circuit supply bundle 4, this device may include several distribution boxes arranged side by side and each provided with several nozzles aligned in a direction extending parallel to the respective longitudinal axes of the two drums 3. Similarly, in the distribution box 1 can open several bundles of supply circuits also aligned in a direction extending parallel to the same longitudinal axes.

La caisse de distribution 1 et la ou les sortie(s) 51 des injecteurs-mélangeurs 5 de chaque circuit 4 d'alimentation en mélange pâteux sont reliées par des conduites 40 débouchant en des entrées respectivement prévues à la partie supérieure et à la partie inférieure de la caisse de distribution 1, ces conduites 40 étant éventuellement en plusieurs segments raccordés par des brides 41 ; les injecteurs-mélangeurs 5 comportent, dans leur face opposée de celle de leur(s) sortie(s) 51 pour une ou plusieurs conduite(s) 40 d'alimentation en mélange pâteux, une entrée 52 dans laquelle débouche une conduite 60 d'alimentation en pâte concentrée appartenant à la voie 6 d'alimentation en pâte, tandis que la conduite 70 d'alimentation en liquide de dilution appartenant à la voie 7 d'alimentation en liquide débouche dans l'injecteur-­mélangeur, selon une direction orthogonale, par une entrée 53 pour le liquide.The distribution box 1 and the outlet (s) 51 of the injector-mixers 5 of each circuit 4 for supplying a pasty mixture are connected by conduits 40 opening into inputs respectively provided at the upper part and at the lower part. of the distribution box 1, these conduits 40 possibly being in several segments connected by flanges 41; the injector-mixers 5 comprise, in their face opposite to that of their outlet (s) 51 for one or more pipes (40) for supplying pasty mixture, an inlet 52 into which a pipe 60 of concentrated pulp supply belonging to the pulp supply path 6, while the pipe 70 for supplying dilution liquid belonging to the liquid supply path 7 opens into the injector-mixer, in an orthogonal direction, through an inlet 53 for the liquid.

En vue de permettre un réglage de débit et de concentration individuellement sur chaque circuit des faisceaux d'alimentation de la caisse de distribution, dans la voie 6 d'alimentation en pâte concentrée de chaque injecteur-mélangeur provenant d'un dispositif d'alimentation en pâte concentrée, est insérée une vanne 61 de réglage de pâte concentrée, et dans la voie 7 d'alimentation en liquide de dilution provenant d'un dispositif d'alimentation en liquide, est insérée une vanne 71 de réglage de débit de dilution.In order to allow an adjustment of flow and concentration individually on each circuit of the supply beams of the distribution box, in the channel 6 of supply of concentrated paste from each injector-mixer coming from a device for supplying concentrated paste, a valve 61 for adjusting concentrated paste is inserted, and into the way 7 for supplying dilution liquid coming from a liquid supply device, is inserted a valve 71 for adjusting dilution rate.

Les organes mobiles des vannes 61 de réglage de débit de pâte et des vannes 71 de réglage de débit de liquide de dilution peuvent être reliés à un moyen de commande manuelle, ou à un moyen de commande automatique tel qu'un ordinateur commandé lui-même manuellement ou automatiquement en fonction de consignes et d'informations envoyées depuis des dispositifs de mesure par tout moyen de transmission connu en soi (non représenté sur les dessins). Ces informations et ces consignes concernent, dans le cas présent, le contrôle de profil du poids et des caractéristiques de résistance de la feuille obtenues dans le sens de distribution et dans le sens travers de celle-ci.The movable members of the valves 61 for adjusting the dough flow rate and the valves 71 for adjusting the dilution liquid flow rate can be connected to a manual control means, or to an automatic control means such as a controlled computer itself. manually or automatically depending on instructions and information sent from measuring devices by any means of transmission known per se (not shown in the drawings). This information and these instructions relate, in the present case, to the profile control of the weight and resistance characteristics of the sheet obtained in the direction of distribution and in the cross direction thereof.

Il en résulte une possibilité de réglage indépendant en continu et par sections dans le sens travers de l'éjection, du débit de pâte concentrée et de liquide de dilution, et en conséquence, de la concentration du débit total, ce qui permet le contrôle permanent des caractéristiques de résistance sens de distribution/sens travers de la feuille formée, tandis que le réglage du débit de pâte permet le contrôle permanent de la masse surfacique de la feuille, dans la section concernée.This results in a possibility of independent adjustment continuously and in sections in the cross direction of the ejection, of the flow of concentrated paste and of dilution liquid, and consequently, of the concentration of the total flow, which allows permanent control. resistance direction distribution / cross direction characteristics of the sheet formed, while the adjustment of the dough flow rate allows permanent control of the surface mass of the sheet, in the section concerned.

Les injecteurs-mélangeurs 5 disposés en aval des vannes présentent une forme générale sensiblement tronconique (figure 2), par exemple constituée de deux troncs de cônes 54, 55 accolés de conicités différentes mais de même sens, dont le diamètre diminue depuis leur base où se trouve l'entrée 52 pour la pâte concentrée jusqu'à celle où se trouve la sortie 51 du mélange pâteux ; l'entrée 53 pour le liquide de dilution est située à proximité de l'entrée 52 pour la pâte, mais son axe central est orthogonal à celui de la première, c'est-à-dire à l'axe longitudinal de l'injecteur-­mélangeur ; l'entrée 52 pour la pâte est munie d'une buse 56 d'injection dont la position longitudinale de l'ajutage 561 est réglable dans l'injecteur-mélangeur sur une certaine plage autour de la région centrale de celui-ci ; cependant, l'ajutage 561 de la buse reste toujours en avant d'une grille perforée 57 s'étendant transversalement dans l'injecteur-mélangeur et déterminant, à l'arrière de celui-ci (c'est-à-dire du côte de plus grand diamètre), une chambre d'entrée pour le liquide de dilution, dans laquelle débouche la voie 7 d'alimentation en liquide ; une seconde grille perforée 58 s'étend en avant de la première et de l'ajutage 561 d'entrée de pâte concentrée, parallèlement à cette première grille perforée 57, c'est-à-dire transversalement à l'injecteur-mélangeur, déterminant vers l'avant une chambre de sortie de mélange pâteux dans laquelle débouche la conduite de sortie. Afin de faciliter la fixation des différentes conduites, les deux entrées 52, 53 et la sortie 51 sont munies d'une bride.The injector-mixers 5 arranged downstream of the valves have a generally substantially frustoconical shape (FIG. 2), for example made up of two truncated cones 54, 55 placed side by side with different conicities but of the same direction, the diameter of which decreases from their base where finds the inlet 52 for the concentrated dough up to that where the outlet 51 for the pasty mixture is located; the inlet 53 for the dilution liquid is located near the inlet 52 for the paste, but its central axis is orthogonal to that of the first, that is to say to the longitudinal axis of the injector -mixer; the inlet 52 for the dough is provided with an injection nozzle 56 whose longitudinal position of the nozzle 561 is adjustable in the injector-mixer over a certain range around the central region thereof; however, the nozzle 561 of the nozzle always remains in front of a perforated grid 57 extending transversely in the injector-mixer and determining, behind it (i.e. on the side larger diameter), an entry chamber for the dilution liquid, into which the liquid supply path 7 opens; a second perforated grid 58 extends in front of the first and of the nozzle 561 of concentrated dough inlet, parallel to this first perforated grid 57, that is to say transversely to the injector-mixer, determining forward a pasty mixture outlet chamber into which the outlet pipe opens. In order to facilitate the fixing of the various pipes, the two inlets 52, 53 and the outlet 51 are provided with a flange.

Dans la région de sortie de la caisse de distribution 1, à l'arrière des buses 2, s'étend longitudinalement une languette de formation 11 disposée horizontalement (figure 3), destinée à favoriser la bonne répartition du mélange pâteux, par turbulences ; cette languette 11 possède une face supérieure et une face inférieure symétriques, présentant en section longitudinale un profil en dents de scie dont les dents ont une arête arrière faiblement inclinée, une arête avant très inclinée, et un fond arrondi. Dans la région de cette languette de formation 11, la caisse de distribution est cloisonnée (figure 4) de telle sorte qu'à chaque circuit du faisceau d'alimentation corresponde un chenal d'éjection 12 créé par cloisonnement de la section transversale de la région de sortie ; les cloisons 13 s'étendent donc longitudinalement dans cette zone, c'est-à-dire également dans la direction de l'éjection, verticalement, jusqu'au bout de la languette de formation, ou au-delà vers l'avant si nécessaire, le calcul pouvant être effectué cas par cas ; ces cloisons 13 sont ondulées au moins dans leur zone d'extrémité, côté sortie du jet, afin d'empêcher tout marquage hydraulique dans la formation de la feuille.In the outlet region of the distribution box 1, behind the nozzles 2, extends longitudinally a forming tongue 11 arranged horizontally (FIG. 3), intended to promote the good distribution of the pasty mixture, by turbulence; this tongue 11 has a symmetrical upper face and lower face, having in longitudinal section a sawtooth profile whose teeth have a slightly inclined rear edge, a very inclined front edge, and a rounded bottom. In the region of this forming tab 11, the distribution box is partitioned (FIG. 4) so that each circuit of the supply beam corresponds to an ejection channel 12 created by partitioning the cross section of the region Release ; the partitions 13 therefore extend longitudinally in this zone, that is to say also in the direction of ejection, vertically, until the end of the forming tab, or beyond forwards if necessary , the calculation can be carried out case by case; these partitions 13 are corrugated at least in their end zone, on the outlet side of the jet, in order to prevent any hydraulic marking in the formation of the sheet.

Ainsi, la pâte concentrée et le liquide de dilution, avec des débits choisis en fonction notamment du grammage et de la résistance désirés pour la feuille déterminés par sections sur la largeur de celle-ci, sont introduits dans les injecteurs-mélangeurs 5 et, de là, le mélange est dirigé par les circuits d'alimentation 4, dans la caisse d'alimentation 1 ; puis, de cette caisse d'alimentation, le mélange pâteux est injecté par les buses 2 entre les deux rouleaux 3, sans qu'apparaisse de marquage hydraulique.Thus, the concentrated paste and the dilution liquid, with flow rates chosen as a function in particular of the grammage and of the resistance desired for the sheet determined by sections over the width of the latter, are introduced into the injector-mixers 5 and, from there, the mixture is directed by the supply circuits 4, in the supply box 1; then, from this feed box, the pasty mixture is injected through the nozzles 2 between the two rollers 3, without any hydraulic marking appearing.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation ci-dessus décrite et représentée, et on pourra en prévoir d'autres formes sans sortir de son cadre.Of course, the invention is not limited to the embodiment described above and shown, and other forms can be provided without departing from its scope.

Claims (8)

1) Dispositif d'alimentation en mélange pâteux, tel que de la pâte à papier, en vue de former une nappe de pâte au travers d'au moins une buse (2) montée en sortie d'une caisse de distribution (1), dispositif caractérisé en ce que, dans la caisse de distribution (1), débouchent des circuits (4) d'alimentation en mélange pâteux, et chaque circuit comporte une voie (7) d'alimentation en liquide et une voie (6) d'alimentation en pâte concentrée munies chacune d'une vanne (71, 61) de réglage de débit et raccordées en aval de ces vannes par un mélangeur (5) comportant une sortie (51) elle-même reliée à une entrée de la caisse de distribution, en ce que la caisse de distribution (1) comporte des chenaux (12) d'éjection délimités par des cloisons (13) longitudinales, et en ce que chaque circuit (4) est en correspondance d'un chenal (12) d'éjection.1) Device for supplying a pasty mixture, such as paper pulp, in order to form a sheet of pulp through at least one nozzle (2) mounted at the outlet of a distribution box (1), device characterized in that, in the distribution box (1), open circuits (4) for supplying pasty mixture, and each circuit comprises a channel (7) for supplying liquid and a channel (6) for supply of concentrated paste each provided with a valve (71, 61) for adjusting the flow rate and connected downstream of these valves by a mixer (5) comprising an outlet (51) itself connected to an inlet of the distribution box , in that the distribution box (1) comprises ejection channels (12) delimited by longitudinal partitions (13), and in that each circuit (4) is in correspondence with a channel (12) of ejection. 2) Dispositif selon la revendication 1, caractérisé en ce que les vannes (71, 61) de réglage comportent des organes mobiles reliés à un moyen de commande manuelle.2) Device according to claim 1, characterized in that the adjustment valves (71, 61) comprise movable members connected to a manual control means. 3) Dispositif selon l'une quelconque des revendications 1 et 2, caractérisé en ce que les vannes (71, 61) de réglage comportent des organes mobiles reliés à un moyen de commande automatique.3) Device according to any one of claims 1 and 2, characterized in that the adjustment valves (71, 61) comprise movable members connected to an automatic control means. 4) Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les mélangeurs (5) comportent deux faces opposées munies l'une d'une entrée (52), et l'autre d'une sortie (51), tandis qu'une autre entrée (53) débouche dans le mélangeur à proximité de la première, et en ce que la première entrée (52) est séparée de la sortie par une grille (58) perforée tandis que la seconde (53) est séparée de ladite sortie par deux grilles (57, 58) perforées.4) Device according to any one of claims 1 to 3, characterized in that the mixers (5) have two opposite faces provided one with an inlet (52), and the other with an outlet (51) , while another inlet (53) opens into the mixer near the first, and in that the first inlet (52) is separated from the outlet by a perforated grid (58) while the second (53) is separated from said outlet by two perforated grids (57, 58). 5) Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que les mélangeurs (5) ont une forme générale tronconique.5) Device according to any one of claims 1 to 4, characterized in that the mixers (5) have a generally frustoconical shape. 6) Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la caisse de distribution (1) comporte une languette de formation (11) horizontale, munie de deux faces respectivement supérieure et inférieure présentant en section longitudinale un profil en dents de scie.6) Device according to any one of claims 1 to 5, characterized in that the distribution box (1) comprises a horizontal forming tab (11), provided with two faces respectively upper and lower having in longitudinal section a profile in Sawtooth. 7) Dispositif selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les cloisons (13) sont ondulées au moins sur une partie de leur longueur.7) Device according to any one of claims 1 to 6, characterized in that the partitions (13) are corrugated at least over part of their length. 8) Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les mélangeurs (5) comportent au moins une buse (56) dont la position est réglable longitudinalement.8) Device according to any one of claims 1 to 7, characterized in that the mixers (5) comprise at least one nozzle (56) whose position is adjustable longitudinally.
EP89402582A 1988-05-13 1989-09-21 Apparatus for feeding a pasty mixture Withdrawn EP0418445A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR8806480A FR2631353A1 (en) 1988-05-13 1988-05-13 PASTA MIXED FEEDING DEVICE
EP89402582A EP0418445A1 (en) 1988-05-13 1989-09-21 Apparatus for feeding a pasty mixture
CA000614141A CA1327471C (en) 1988-05-13 1989-09-28 Pasty mix feed device
US07/422,050 US5030326A (en) 1988-05-13 1989-10-16 Paste-like mixture feed device

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8806480A FR2631353A1 (en) 1988-05-13 1988-05-13 PASTA MIXED FEEDING DEVICE
EP89402582A EP0418445A1 (en) 1988-05-13 1989-09-21 Apparatus for feeding a pasty mixture
CA000614141A CA1327471C (en) 1988-05-13 1989-09-28 Pasty mix feed device
US07/422,050 US5030326A (en) 1988-05-13 1989-10-16 Paste-like mixture feed device

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EP0418445A1 true EP0418445A1 (en) 1991-03-27

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EP89402582A Withdrawn EP0418445A1 (en) 1988-05-13 1989-09-21 Apparatus for feeding a pasty mixture

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US (1) US5030326A (en)
EP (1) EP0418445A1 (en)
CA (1) CA1327471C (en)
FR (1) FR2631353A1 (en)

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EP0634523A1 (en) * 1993-07-01 1995-01-18 Valmet Paper Machinery Inc. Method in the regulation of a multi-layer headbox and a multi-layer headbox

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US5707495A (en) * 1990-06-20 1998-01-13 J.M. Voith Gmbh Headbox for papermaking machine with more uniform flow
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US5938896A (en) * 1997-09-30 1999-08-17 Voith Sulzer Paper Technology North America, Inc. Hydraulic increaser for a wet end of a paper-making machine
FI104384B (en) * 1998-06-05 2000-01-14 Valmet Corp Apparatus and Method for Mixing Freshwater and Fresh Mass in a Post-Wastewater Canal
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Also Published As

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US5030326A (en) 1991-07-09
CA1327471C (en) 1994-03-08
FR2631353A1 (en) 1989-11-17

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