EP0188932B1 - Process and apparatus for removing a liquid from a material obtained, in particular by a paper-making process - Google Patents

Process and apparatus for removing a liquid from a material obtained, in particular by a paper-making process Download PDF

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Publication number
EP0188932B1
EP0188932B1 EP85402383A EP85402383A EP0188932B1 EP 0188932 B1 EP0188932 B1 EP 0188932B1 EP 85402383 A EP85402383 A EP 85402383A EP 85402383 A EP85402383 A EP 85402383A EP 0188932 B1 EP0188932 B1 EP 0188932B1
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EP
European Patent Office
Prior art keywords
liquid
layer
evaporation
cloth
fabric
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Expired
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EP85402383A
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German (de)
French (fr)
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EP0188932A1 (en
Inventor
André M. Faurie
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Cellulose du Pin SA
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Cellulose du Pin SA
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Priority to AT85402383T priority Critical patent/ATE44784T1/en
Publication of EP0188932A1 publication Critical patent/EP0188932A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00

Definitions

  • the present invention relates to the removal of at least part of the liquid from a layer obtained by deposition according to a papermaking process as described in the first part of claim 1.
  • the removal of the liquid portion of a layer having a low solids content is a problem encountered in various industries. This can be the elimination of water from the sludge, for example sludge obtained in treatment plants or sludge which one wishes to recover in particular as a fertilizer.
  • paper is meant according to the invention any material based on cellulosic fibers, in the form of a mattress or sheets.
  • the liquid is removed first by draining by gravity and / or by suction through the porous fabric, then by a spin by pressing between fabrics and / or rollers, this operation being able to take place on the first fabric, that is to say the fabric for forming the layer, or on one or more other fabrics succeeding it.
  • the fibrous mat leaves the last cloth on which it was placed so that it can be heated, for example by contact with hot cylinders, so that another part of the liquid which it contains is eliminated by evaporation.
  • Patent publication GB-A-2 047 396 thus describes a device for drying a Slurry by draining with suction followed by evaporation of the water.
  • the invention provides a new process for the continuous elimination of at least part of the liquid from a layer based on cellulosic fibers obtained by continuous deposition on a mobile, porous support, of a liquid composition having a low dry matter (solid) content, i.e. less than about 10% by weight.
  • the liquid is at least partially removed from the layer by draining by gravity and / or if necessary by suction, associated with wringing by pressing, and by evaporation, all of these operations then being carried out.
  • the layer is placed on the same fabric porous to the liquid which is the support for forming the layer, therefore without transfer from one support to another support, the evaporation of the liquid from the layer placed on its formation support, being obtained by passing a gas flow through the layer and said support.
  • the method according to the invention makes it possible to continuously and rapidly eliminate a quantity of liquid which can bring the cellulosic layer to solids concentrations of between 30 and 100% approximately, without said layer leaving the formation support, and this at starting from a liquid composition, with a dryness of less than approximately 10% and preferably less than 1%.
  • the gas flow can be a flow of air, nitrogen, or another gas, depending in particular on the nature of the liquid to be eliminated, as described in more detail below.
  • a second fabric or strip which takes the layer to be treated sandwiched between itself and the fabric used for the assembly. of treatment.
  • the layer to be treated is sandwiched between the two fabrics during only part of the milking liquid elimination.
  • the second fabric is used during essentially all of the liquid removal treatment.
  • the use or not of a second porous fabric at one or more locations, or over essentially the whole extent of the treatment is dictated by the nature of the layer to be treated, that is to say in particular its composition, its resistance mechanical in the running direction, and also the liquid to be eliminated.
  • spin is meant according to the invention all operations tending to exert pressure on the layer to extract liquid therefrom.
  • the spin can also be variable depending on the material of the layer to be treated. It can vary in intensity and / or by the means used to achieve it. It can vary according to its location and also according to the mechanical properties of the layer to be treated and this at a determined location. It can also be progressive in intensity.
  • the method according to the invention applies to the elimination of a liquid which may be water or any other diluent allowing the formation of the cellulosic layer on a porous formation support, for example an alcohol or a mixture of 'Alcohols chosen in particular from methyl, ethyl and isopropyl alcohols.
  • a liquid which may be water or any other diluent allowing the formation of the cellulosic layer on a porous formation support, for example an alcohol or a mixture of 'Alcohols chosen in particular from methyl, ethyl and isopropyl alcohols.
  • the invention applies in particular and with advantage to very fragile layers which have very little resistance mechanical in the running direction, and in particular those which are not self-supporting.
  • the invention applies in particular to the manufacture of paper of very low grammage which cannot be obtained without risk of rupture on a conventional paper manufacturing line requiring a high speed transfer of the fibrous layer of the forming fabric. to the cylinders for spinning.
  • the invention therefore advantageously applies to the manufacture of paper with a grammage of less than approximately 30 g.
  • the water-miscible liquid is generally an alcohol such as methyl, ethyl or isopropyl alcohol, so that the elimination of the liquid according to the invention consists in eliminating this alcohol.
  • the evaporation of the liquid from the layer supported by the porous fabric by passing a flow of gas through the layer can use a flow of hot air or, in a variant, a flow of nitrogen.
  • the treatment station for evaporation is advantageously placed in a closed enclosure in the case where the liquid to be removed from the layer is an organic liquid, in particular to avoid nuisances.
  • all the operations for removing the liquid can if necessary take place under a nitrogen atmosphere.
  • the invention also applies to the elimination of the liquid contained in superimposed layers obtained by several simultaneous or successive jets.
  • the invention also relates to a device for removing the liquid part of a layer obtained continuously by depositing a very diluted composition on a mobile support.
  • the device according to the invention comprises a mobile, continuous support canvas, porous to the liquid to be eliminated, extending over the entire extent of the device, means for depositing the liquid composition based on cellulosic fibers on the canvas. porous, these means being placed in the upstream part of the device, means for eliminating part of the liquid by spinning, means creating a gas flow through the support fabric to eliminate another part of the liquid by evaporation, all of these means being arranged above and / or below the porous fabric supporting the cast layer, the porous fabric having characteristics such that it allows drainage, spinning, heating, etc.
  • the device can also include, to accentuate the spin, very varied pressing means, known in particular in the paper industry, for example one or more pairs of cylinders between which the layer to be treated is pressed, one or more knee pads, etc. ..
  • the latter further comprises an upper strip or fabric which, associated with the lower casting fabric, takes the layer to be sandwiched at least at one of the locations for the elimination of the liquid.
  • this second strip maintains the layer to be sandwiched preferably from its formation or just after, until the end of the treatment.
  • the assembly When the device is used to remove an organic liquid, such as an alcohol, the assembly can be placed in an enclosure under an inert atmosphere with respect to the liquid to be removed from the layer.
  • an organic liquid such as an alcohol
  • the means for eliminating the liquid by evaporation are advantageously means creating a gas flow passing through the layer.
  • These means may include suction boxes and blowing boxes associated therewith, being arranged opposite the suction boxes on either side of the porous conveyor fabric.
  • the device shown in FIG. 1 comprises a continuous support fabric 1, kept taut, between rollers 101 and in particular its upper part between an upstream roller 2 and a downstream roller 3.
  • a box of head 4 extends transversely above the fabric 1.
  • the device comprises located further downstream a press consisting of two rollers 5 and 6 arranged on either side of the conveyor fabric. Under the upper part of the conveyor belt is placed a tank 7 for recovering the liquid eliminated by wringing and pressing.
  • the device Downstream of the press, the device comprises means 8 for removing the liquid by evaporation.
  • These means are here a succession of blower boxes 9 and suction 10 a gas flow, arranged above and below the conveyor fabric.
  • the operation of the device is described in relation to the manufacture of paper with a grammage of 10 g / m 2 .
  • the aqueous paper composition 102 having a concentration of approximately 0.2% in dry matter is brought to the headbox from where it is poured to form a liquid layer of uniform thickness on the conveyor fabric 1.
  • part of the water 12 is removed by drainage, passing by gravity through the porous fabric 1. Another part of the water is removed by wringing at the time of pressing between the two rollers 5 and 6
  • the water which passes through the porous fabric 1 is recovered in the tank 7.
  • an additional quantity of water is entrained in the form of vapor 13 by the flow of hot air.
  • the sheet of paper 14 is removed from the canvas to be wound in a reel 15 and stored.
  • the device shown in Figure 2 is used for the manufacture of a superabsorbent layer based on grafted cellulosic fibers.
  • This device comprises a continuous support fabric 21, the upper part of which is kept tensioned between rollers, in particular an upstream roller 22 and a downstream roller 23. Rollers 24, 25 some of which 25, with adjustable position, act on the lower part of the canvas and allow it to be stretched correctly.
  • a second porous fabric 26 is disposed above the first fabric, in parallel, being stretched between rollers, in particular an upstream roller 27 and a downstream roller 28. Rollers 29, 30 some of which 30, with adjustable position, correctly tension the fabric 26.
  • a headbox 31 extends transversely above the lower conveyor fabric, upstream of the roller 27.
  • the device also comprises a press 32, consisting of two rollers 33 and 34, arranged on either side of the two canvases. Between the roller 27 and the press 32, three rollers 35, 36 and 37 constitute a toggle for the two fabrics. Under the upper part of the lower conveyor fabric 21, a tank 38 is arranged for recovering the liquid eliminated by draining and spinning. Downstream of the press 32 the device comprises means 39 for removing the liquid by evaporation. These means are boxes blowing 40 and sucking 41 a gas flow, arranged above and below the two fabrics. On each other side of the two fabrics, there is a suction box facing each blowing fan. These boxes are supplied with nitrogen 42.
  • the entire device is described in connection with the manufacture of a sheet of superabsorbent cellulosic material.
  • a liquid composition 103 containing modified cellulose fibers to which a polymer is chemically bonded in the form of an alkali metal salt originating from a polymerizable olefinically unsaturated monomer, in a mixture of ethyl alcohol and ammonia, the concentration of dry matter being about 0.3%, is brought to the headbox from where it is sheeted on the conveyor fabric 21.
  • the liquid layer is entrained by said fabric and it is sandwiched between this fabric 21 and the upper fabric 26.
  • Part of the liquid 44 is removed by draining and wringing through the lower fabric 21 and is recovered in the tank 38, under the fabric 21 to then be recycled. Spinning is accentuated as the knee switch passes.
  • the layer still sandwiched between the two fabrics then passes between the two rollers of the press, which further completes the spin.
  • the layer then passes between the blower and suction boxes.
  • a stream of nitrogen 42 passing through the upper fabric eliminates an additional part of the liquid by evaporation in contact with the stream 42.
  • the nitrogen gas stream charged with the gaseous mixture 47 of alcohol and ammonia passes through the lower fabric , passes into the suction boxes and is sent to an annex device, not shown, for the recovery of vapors.
  • the layer still maintained between the two fabrics is dry. After the upper fabric is detached from the fibrous layer, the latter leaves the lower fabric to be wound up using a winding device 45 on a spool 46.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Paper (AREA)
  • External Artificial Organs (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Apparatus For Making Beverages (AREA)
  • Treatment Of Sludge (AREA)
  • Laminated Bodies (AREA)
  • Water Treatment By Sorption (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Materials For Medical Uses (AREA)

Abstract

Continuous elimination of at least part of the liquid contained in a layer formed by depositing a liquid compound having a low solid matter content on a mobile, continuous, liquid-porous support, is effected by dripping, pressing and evaporation while the layer is maintained on the formation support without transfer. Evaporation means include means for passing a heated, gaseous flux through the layers.

Description

La présente invention concerne l'élimination d'au moins une partie du liquide d'une couche obtenue par dépôt selon un procédé papetier comme décrit dans la première partie de la revendication 1.The present invention relates to the removal of at least part of the liquid from a layer obtained by deposition according to a papermaking process as described in the first part of claim 1.

L'élimination de la partie liquide d'une couche présentant une faible teneur en matières solides est un problème que l'on rencontre dans des industries diverses. Cela peut être l'élimination de l'eau des boues, par exemple des boues obtenues dans les stations d'épuration ou des boues que l'on veut valoriser notamment en tant qu'engrais.The removal of the liquid portion of a layer having a low solids content is a problem encountered in various industries. This can be the elimination of water from the sludge, for example sludge obtained in treatment plants or sludge which one wishes to recover in particular as a fertilizer.

Cela peut être aussi dans l'industrie papetière où l'on dépose sur une toile poreuse, mobile, une composition liquide de faible teneur en fibres papetières, pour former une couche de laquelle on élimine ensuite la partie liquide.This can also be in the paper industry where a liquid composition with a low content of paper fibers is deposited on a porous, mobile canvas, to form a layer from which the liquid part is then eliminated.

Bien que l'invention concerne des industries diverses, la suite de la description sera surtout orientée vers l'application de l'invention à l'industrie papetière. Par papier, on entend selon l'invention tout matériau à base de fibres cellulosiques, sous forme de matelas ou de feuilles.Although the invention relates to various industries, the rest of the description will be mainly directed towards the application of the invention to the paper industry. By paper is meant according to the invention any material based on cellulosic fibers, in the form of a mattress or sheets.

Dans la fabrication industrielle du papier, une composition liquide de faible teneur en fibres papetières, c'est-à-dire de faible siccité, est déversée sur une toile poreuse en déplacement continu.In industrial paper manufacture, a liquid composition with a low content of paper fibers, that is to say of low dryness, is poured onto a porous fabric in continuous movement.

Pour passer de la couche liquide déposée sur la toile de formation, au matelas fibreux solide, le liquide est éliminé d'abord par un égouttage par gravité et/ou par aspiration à travers la toile poreuse, puis par un essorage par pressage entre des toiles et/ou des rouleaux, cette opération pouvant se dérouler sur la première toile, c'est-à-dire la toile de formation de la couche, ou sur une ou plusieurs autres toiles lui succédant. Après quoi le matelas fibreux quitte la dernière toile sur laquelle il était disposé pour pouvoir être chauffé, par exemple par contact avec des cylindres chauds, afin qu'une autre partie du liquide qu'il contient soit éliminée par évaporation. L'élimination du liquide par égouttage, puis par essorage, puis par chauffage et évaporation est réalisée alors que la couche ou le matelas fibreux est disposé sur des supports différents, le passage de la couche du support de formation au support suivant étant réalisé généralement alors que la concentration en matière sèche est inférieure à 30 %. La publication de brevet GB-A- 1 389 992 décrit un tel procédé d'élimination du liquide avec passage d'un support à un autre.To pass from the liquid layer deposited on the forming fabric, to the solid fibrous mattress, the liquid is removed first by draining by gravity and / or by suction through the porous fabric, then by a spin by pressing between fabrics and / or rollers, this operation being able to take place on the first fabric, that is to say the fabric for forming the layer, or on one or more other fabrics succeeding it. After which the fibrous mat leaves the last cloth on which it was placed so that it can be heated, for example by contact with hot cylinders, so that another part of the liquid which it contains is eliminated by evaporation. The elimination of the liquid by draining, then by wringing, then by heating and evaporation is carried out while the layer or the fibrous mat is placed on different supports, the passage of the layer from the formation support to the following support generally being carried out. that the dry matter concentration is less than 30%. Patent publication GB-A-1 389 992 describes such a process for removing the liquid with passage from one support to another.

Dans le cas particulier des papiers de faible grammage, c'est à dire des grammages inférieurs à environ 30 g/m2, l'élimination de l'eau par évaporation est réalisée sur un cylindre sécheur unique et le transfert de la feuille de papier de la toile poreuse de formation au cylindre sécheur est effectué alors que la concentration en matières sèches est d'environ 20 à 30 % en poids. De sorte que la capacité de fabrication d'une ligne pour faibles grammages est limitée par le diamètre du cylindre sécheur.In the particular case of papers of low grammage, that is to say grammages lower than approximately 30 g / m 2 , the elimination of water by evaporation is carried out on a single drying cylinder and the transfer of the sheet of paper porous fabric forming the drying cylinder is carried out while the dry matter concentration is about 20 to 30% by weight. So that the manufacturing capacity of a line for low grammages is limited by the diameter of the drying cylinder.

D'autres procédés ou dispositifs d'élimination d'une partie de l'eau d'une composition liquide à faible teneur en matières sèches ou plus concentrée tel un Slurry sont connus. Ainsi la publication de brevet GB-A-2 047 396 décrit un dispositif de séchage d'un Slurry par égouttage avec aspiration suivi d'une évaporation de l'eau.Other methods or devices for removing part of the water from a liquid composition with a low dry matter content or more concentrated such as a Slurry are known. Patent publication GB-A-2 047 396 thus describes a device for drying a Slurry by draining with suction followed by evaporation of the water.

L'élimination de l'eau ne s'effectue pas dans ce cas de manière continue et efficace. Dans le document US-A-3 117 907, on forme une couche de mica par un procédé papetier en éliminant de l'eau par aspiration et par évaporation. Dans le document DE-A-1 511 186, on utilise une bande imperméable pour mieux maintenir la couche fibreuse durant le procédé d'élimination de l'eau, mais c'est au détriment de l'élimination du liquide qui ne peut passer à travers la bande support. Aucun de ces procédés décrits ne convient pour une élimination efficace du liquide lors de la formation de couches de fibres cellulosiques fragiles.In this case, the elimination of water is not carried out continuously and efficiently. In document US Pat. No. 3,117,907, a layer of mica is formed by a papermaking process by removing water by suction and by evaporation. In document DE-A-1 511 186, an impermeable band is used to better maintain the fibrous layer during the process of removing water, but it is at the expense of removing the liquid which cannot pass through. through the support strip. None of these described methods is suitable for effective removal of the liquid during the formation of layers of fragile cellulosic fibers.

L'invention propose un nouveau procédé pour l'élimination en continu d'au moins une partie du liquide d'une couche à base de fibres cellulosiques obtenue par dépôt en continu sur un support mobile, poreux, d'une composition liquide présentant une faible teneur en matières sèches (solides), c'est-à-dire inférieure à 10 % en poids environ. Selon l'invention, on élimine au moins partiellement le liquide de la couche par un égouttage par gravité et/ou le cas échéant par aspiration, associé à un essorage par pressage, et par une évaporation, l'ensemble de ces opérations étant effectuées alors que la couche est disposée sur une même toile poreuse au liquide qui est le support de formation de la couche, donc sans transfert d'un support à un autre support, l'évaporation du liquide de la couche disposée sur son support de formation, étant obtenue par passage d'un flux gazeux à travers la couche et ledit support.The invention provides a new process for the continuous elimination of at least part of the liquid from a layer based on cellulosic fibers obtained by continuous deposition on a mobile, porous support, of a liquid composition having a low dry matter (solid) content, i.e. less than about 10% by weight. According to the invention, the liquid is at least partially removed from the layer by draining by gravity and / or if necessary by suction, associated with wringing by pressing, and by evaporation, all of these operations then being carried out. that the layer is placed on the same fabric porous to the liquid which is the support for forming the layer, therefore without transfer from one support to another support, the evaporation of the liquid from the layer placed on its formation support, being obtained by passing a gas flow through the layer and said support.

Le procédé selon l'invention permet d'éliminer en continu et rapidement une quantité de liquide pouvant amener la couche cellulosique à des concentrations en matières solides comprises entre 30 et 100 % environ, sans que ladite couche quitte le support de formation, et ce à partir d'une composition liquide, de siccité inférieure à 10 % environ et de préférence inférieure à 1 %.The method according to the invention makes it possible to continuously and rapidly eliminate a quantity of liquid which can bring the cellulosic layer to solids concentrations of between 30 and 100% approximately, without said layer leaving the formation support, and this at starting from a liquid composition, with a dryness of less than approximately 10% and preferably less than 1%.

Selon une caractéristique avantageuse du procédé, le flux gazeux peut être un flux d'air, d'azote, ou d'un autre gaz, selon notamment la nature du liquide à éliminer, comme décrit plus en détail par la suite.According to an advantageous characteristic of the process, the gas flow can be a flow of air, nitrogen, or another gas, depending in particular on the nature of the liquid to be eliminated, as described in more detail below.

Selon une autre caractéristique avantageuse de l'invention, on utilise une deuxième toile ou bande qui prend la couche à traiter en sandwich entre elle-même et la toile utilisée pour l'ensemble. du traitement. Dans une forme du procédé, la couche à traiter est prise en sandwich entre les deux toiles durant une partie seulement du traitement d'élimination du liquide. Dans une variante, la deuxième toile est utilisée durant essentiellement tout le traitement d'élimination du liquide. L'utilisation ou non d'une deuxième toile poreuse a un ou plusieurs emplacements, ou sur essentiellement toute l'étendue du traitement est dictée par la nature de la couche à traiter, c'est-à-dire notamment sa composition, sa résistance mécanique dans le sens marche, et aussi le liquide à éliminer.According to another advantageous characteristic of the invention, a second fabric or strip is used which takes the layer to be treated sandwiched between itself and the fabric used for the assembly. of treatment. In one form of the process, the layer to be treated is sandwiched between the two fabrics during only part of the milking liquid elimination. Alternatively, the second fabric is used during essentially all of the liquid removal treatment. The use or not of a second porous fabric at one or more locations, or over essentially the whole extent of the treatment is dictated by the nature of the layer to be treated, that is to say in particular its composition, its resistance mechanical in the running direction, and also the liquid to be eliminated.

Par essorage on entend selon l'invention toutes les opérations tendant à exercer une pression sur la couche pour en extraire du liquide.By spin is meant according to the invention all operations tending to exert pressure on the layer to extract liquid therefrom.

L'essorage peut être variable également selon la matière de la couche à traiter. Il peut varier en intensité et/ou par les moyens mis en oeuvre pour le réaliser. Il peut varier selon son emplacement et aussi selon les propriétés mécaniques de la couche à traiter et ce à un emplacement déterminé. Il peut aussi être progressif en intensité.The spin can also be variable depending on the material of the layer to be treated. It can vary in intensity and / or by the means used to achieve it. It can vary according to its location and also according to the mechanical properties of the layer to be treated and this at a determined location. It can also be progressive in intensity.

Le procédé selon l'invention s'applique à l'élimination d'un liquide qui peut être de l'eau ou tout autre diluant permettant la formation de la couche cellulosique sur un support poreux de formation, par exemple un alcool ou un mélange d'alcools choisis notamment parmi les alcools méthylique, éthylique, isopropylique.The method according to the invention applies to the elimination of a liquid which may be water or any other diluent allowing the formation of the cellulosic layer on a porous formation support, for example an alcohol or a mixture of 'Alcohols chosen in particular from methyl, ethyl and isopropyl alcohols.

Du fait que la couche est maintenue, selon l'invention, sur un même support durant tout le traitement pour l'élimination du liquide, l'invention s'applique en particulier et avec avantage à des couches très fragiles qui ont très peu de résistance mécanique dans le sens marche, et notamment celles qui ne sont pas autoporteuses.Because the layer is maintained, according to the invention, on the same support throughout the treatment for the elimination of the liquid, the invention applies in particular and with advantage to very fragile layers which have very little resistance mechanical in the running direction, and in particular those which are not self-supporting.

Ainsi l'invention s'applique notamment à la fabrication d'un papier de très faible grammage ne pouvant être obtenu sans risque de rupture sur une ligne classique de fabrication du papier nécessitant un transfert à grande vitesse de la couche fibreuse de la toile de formation aux cylindres pour l'essorage. Par l'utilisation d'un support continu et unique pour l'ensemble du traitement d'élimination du liquide contenu dans la couche, il n'y a pas de risque de rupture de celle-ci au cours du traitement.Thus, the invention applies in particular to the manufacture of paper of very low grammage which cannot be obtained without risk of rupture on a conventional paper manufacturing line requiring a high speed transfer of the fibrous layer of the forming fabric. to the cylinders for spinning. By using a single, continuous support for the entire treatment for removing the liquid contained in the layer, there is no risk of the layer breaking during the treatment.

L'invention s'applique donc avantageusement à la fabrication d'un papier d'un grammage inférieur à 30 g environ.The invention therefore advantageously applies to the manufacture of paper with a grammage of less than approximately 30 g.

L'invention s'applique aussi avec avantage à l'élimination du liquide d'une couche contenant des fibres cellulosiques greffées et notamment à la fabrication de matériaux cellulosiques secs superabsorbants c'est à dire ayant une grande capacité de rétention d'eau et de liquide physiologique. Ainsi l'invention s'applique en particulier à l'élimination du liquide d'une couche fibreuse d'un matériau obtenu par exemple par la suite des opérations suivantes :

  • on active la cellulose contenue dans la pâte cellulosique,
  • on greffe un monomère polymérisable à insaturation oléfinique ayant des groupements fonctionnels hydrolysables sur la cellulose,
  • on hydrolyse la pâte cellulosique greffée avec un alcali,
  • on lave le produit à l'eau jusqu'à obtention d'un état de gonflement maximum,
  • on acidifie le produit à un pH tel qu'après élimination d'eau, il se trouve dans un état de gonflement minimum,
  • on transforme le produit en sa forme sel, en présence d'un liquide miscible à l'eau, et
  • on élimine le liquide après formation d'une couche conformément à l'invention.
The invention also applies with advantage to the elimination of the liquid from a layer containing grafted cellulosic fibers and in particular to the manufacture of superabsorbent dry cellulosic materials, that is to say having a high capacity for retaining water and physiological fluid. Thus the invention applies in particular to the removal of the liquid from a fibrous layer of a material obtained for example by the following operations:
  • the cellulose contained in the cellulose pulp is activated,
  • an olefinically unsaturated polymerizable monomer is grafted having hydrolysable functional groups on the cellulose,
  • the grafted cellulose pulp is hydrolyzed with an alkali,
  • the product is washed with water until a state of maximum swelling is obtained,
  • the product is acidified to a pH such that after elimination of water, it is in a state of minimum swelling,
  • the product is transformed into its salt form, in the presence of a water-miscible liquid, and
  • the liquid is removed after forming a layer according to the invention.

Le liquide miscible à l'eau est généralement un alcool comme l'alcool méthylique, éthylique ou isopropylique, de sorte que l'élimination du liquide selon l'invention consiste à éliminer cet alcool.The water-miscible liquid is generally an alcohol such as methyl, ethyl or isopropyl alcohol, so that the elimination of the liquid according to the invention consists in eliminating this alcohol.

L'évaporation du liquide de la couche soutenue par la toile poreuse par passage d'un flux de gaz à travers la couche peut utiliser un flux d'air chaud ou dans une variante, un flux d'azote.The evaporation of the liquid from the layer supported by the porous fabric by passing a flow of gas through the layer can use a flow of hot air or, in a variant, a flow of nitrogen.

Le poste de traitement pour l'évaporation est avantageusement placé dans une enceinte fermée dans le cas où le liquide à éliminer de la couche est un liquide organique, notamment pour éviter des nuisances. En outre, toutes les opérations d'élimination du liquide peuvent le cas échéant se dérouler sous atmosphère d'azote.The treatment station for evaporation is advantageously placed in a closed enclosure in the case where the liquid to be removed from the layer is an organic liquid, in particular to avoid nuisances. In addition, all the operations for removing the liquid can if necessary take place under a nitrogen atmosphere.

L'invention s'applique également à l'élimination du liquide contenu dans des couches superposées obtenues par plusieurs jets simultanés ou successifs.The invention also applies to the elimination of the liquid contained in superimposed layers obtained by several simultaneous or successive jets.

L'invention concerne également un dispositif pour l'élimination de la partie liquide d'une couche obtenue en continu par dépôt d'une composition très diluée sur un support mobile.The invention also relates to a device for removing the liquid part of a layer obtained continuously by depositing a very diluted composition on a mobile support.

Le dispositif selon l'invention comprend une toile-support mobile, continue, 'poreuse au liquide à éliminer, s'étendant sur toute l'étendue du dispositif, des moyens pour le dépôt de la composition liquide à base de fibres cellulosiques sur la toile poreuse, ces moyens étant placés dans la partie amont du dispositif, des moyens pour éliminer une partie du liquide par essorage, des moyens créant un flux gazeux à travers la toile support pour éliminer une autre partie du liquide par évaporation, l'ensemble de ces moyens étant disposés au dessus et/ou en dessous de la toile poreuse supportant la couche coulée, la toile poreuse présentant des caractéristiques telles qu'elle permet l'égouttage, l'essorage, le chauffage etc...The device according to the invention comprises a mobile, continuous support canvas, porous to the liquid to be eliminated, extending over the entire extent of the device, means for depositing the liquid composition based on cellulosic fibers on the canvas. porous, these means being placed in the upstream part of the device, means for eliminating part of the liquid by spinning, means creating a gas flow through the support fabric to eliminate another part of the liquid by evaporation, all of these means being arranged above and / or below the porous fabric supporting the cast layer, the porous fabric having characteristics such that it allows drainage, spinning, heating, etc.

Le dispositif peut encore comprendre pour accentuer l'essorage, des moyens de pressage très variés, connus notamment dans l'industrie papetière, par exemple une ou plusieurs paires de cylindres entre lesquels est pressée la couche à traiter, une ou plusieurs genouillères, etc...The device can also include, to accentuate the spin, very varied pressing means, known in particular in the paper industry, for example one or more pairs of cylinders between which the layer to be treated is pressed, one or more knee pads, etc. ..

Dans une réalisation du dispositif, celui-ci comprend en outre une bande ou toile supérieure qui, associée à la toile inférieure de coulée, prend la couche à traiter en sandwich au moins à un des emplacements pour l'élimination du liquide. Lorsque le dispositif est utilisé pour traiter des couches particulièrement fragiles, cette deuxième bande maintient la couche à traiter en sandwich de préférence depuis sa formation ou juste après, jusqu'à la fin du traitement.In one embodiment of the device, the latter further comprises an upper strip or fabric which, associated with the lower casting fabric, takes the layer to be sandwiched at least at one of the locations for the elimination of the liquid. When the device is used to treat particularly fragile layers, this second strip maintains the layer to be sandwiched preferably from its formation or just after, until the end of the treatment.

Lorsque le dispositif est utilisé pour éliminer un liquide organique, tel un alcool, l'ensemble peut être disposé dans une enceinte sous atmosphère inerte par rapport au liquide à éliminer de la couche.When the device is used to remove an organic liquid, such as an alcohol, the assembly can be placed in an enclosure under an inert atmosphere with respect to the liquid to be removed from the layer.

Les moyens pour éliminer le liquide par évaporation sont avantageusement des moyens créant un flux gazeux traversant la couche. Ces moyens peuvent comprendre des caissons aspirants et des caissons soufflants qui leur sont associés, en étant disposés en face des caissons aspirants de part et d'autre de la toile transporteuse poreuse.The means for eliminating the liquid by evaporation are advantageously means creating a gas flow passing through the layer. These means may include suction boxes and blowing boxes associated therewith, being arranged opposite the suction boxes on either side of the porous conveyor fabric.

D'autres caractéristiques et avantages de l'invention apparaîtront dans des exemples de réalisation du dispositif selon l'invention.

  • La figure 1 représente un dispositif utilisé pour la fabrication d'un papier de très faible grammage.
  • La figure 2 représente un dispositif utilisé pour la fabrication d'une couche superabsorbante à base de fibres cellulosiques greffées.
Other characteristics and advantages of the invention will appear in embodiments of the device according to the invention.
  • FIG. 1 represents a device used for the production of very light grammage paper.
  • FIG. 2 represents a device used for the manufacture of a superabsorbent layer based on grafted cellulosic fibers.

Le dispositif représenté sur la figure 1 comprend une toile-support, continue 1, maintenue tendue, entre des rouleaux 101 et notamment sa partie supérieure entre un rouleau amont 2 et un rouleau aval 3. Disposée dans la partie amont du dispositif, une caisse de tête 4 s'étend transversalement au dessus de la toile 1. Le dispositif comprend située plus en aval une presse constituée de deux rouleaux 5 et 6 disposés de part et d'autre de la toile transporteuse. Sous la partie supérieure de la toile transporteuse est disposé un bac 7 pour la récupération du liquide éliminé par essorage et pressage.The device shown in FIG. 1 comprises a continuous support fabric 1, kept taut, between rollers 101 and in particular its upper part between an upstream roller 2 and a downstream roller 3. Arranged in the upstream part of the device, a box of head 4 extends transversely above the fabric 1. The device comprises located further downstream a press consisting of two rollers 5 and 6 arranged on either side of the conveyor fabric. Under the upper part of the conveyor belt is placed a tank 7 for recovering the liquid eliminated by wringing and pressing.

En aval de la presse, le dispositif comporte des moyens 8 pour l'élimination du liquide par évaporation. Ces moyens sont ici une succession de caissons soufflants 9 et aspirants 10 un flux gazeux, disposés au dessus et en dessous de la toile transporteuse.Downstream of the press, the device comprises means 8 for removing the liquid by evaporation. These means are here a succession of blower boxes 9 and suction 10 a gas flow, arranged above and below the conveyor fabric.

. A chaque caisson soufflant fait face de l'autre côté de la toile un caisson aspirant. Ces caissons sont alimentés par de l'air chaud 11.. To each blowing box faces on the other side of the fabric a suction box. These boxes are supplied with hot air 11.

Le fonctionnement du dispositif est décrit en relation avec la fabrication d'un papier d'un grammage de 10 g/m2. La composition papetière aqueuse 102 présentant une concentration d'environ 0,2 % en matières sèches est apportée à la caisse de tête d'où elle est déversée pour former une couche liquide d'épaisseur homogène sur la toile transporteuse 1.The operation of the device is described in relation to the manufacture of paper with a grammage of 10 g / m 2 . The aqueous paper composition 102 having a concentration of approximately 0.2% in dry matter is brought to the headbox from where it is poured to form a liquid layer of uniform thickness on the conveyor fabric 1.

Au cours de son transport, une partie de l'eau 12 est éliminée par égouttage en passant par gravité à travers la toile poreuse 1. Une autre partie de l'eau est éliminée par essorage au moment du pressage entre les deux rouleaux 5 et 6. L'eau qui passe à travers la toile poreuse 1 est récupérée dans le bac 7. Par passage entre les caissons soufflants 9 et aspirants 10, une quantité supplémentaire d'eau est entraînée sous forme de vapeur 13 par le flux d'air chaud. Au bout du dispositif, la feuille de papier 14 est retirée de la toile pour être enroulée en bobine 15 et stockée.During its transport, part of the water 12 is removed by drainage, passing by gravity through the porous fabric 1. Another part of the water is removed by wringing at the time of pressing between the two rollers 5 and 6 The water which passes through the porous fabric 1 is recovered in the tank 7. By passing between the blowing boxes 9 and suction boxes 10, an additional quantity of water is entrained in the form of vapor 13 by the flow of hot air. . At the end of the device, the sheet of paper 14 is removed from the canvas to be wound in a reel 15 and stored.

Le dispositif représenté sur la figure 2 est utilisé pour la fabrication d'une couche superabsorbante à base de fibres cellulosiques greffées. Ce dispositif comprend une toile-support continue 21 dont la partie supérieure est maintenue tendue entre des rouleaux, notamment un rouleau amont 22 et un rouleau aval 23. Des rouleaux 24, 25 dont certains 25, à position réglable, agissent sur la partie inférieure de la toile et permettent de la tendre correctement. Une deuxième toile poreuse 26 est disposée au dessus de la première toile, parallèlement, en étant tendue entre des rouleaux notamment un rouleau amont 27 et un rouleau aval 28. Des rouleaux 29, 30 dont certains 30, à position réglable, tendent correctement la toile 26. Une caisse de tête 31 s'étend transversalement au dessus de la toile transporteuse inférieure, en amont du rouleau 27. Le dispositif comprend également une presse 32, constituée de deux rouleaux 33 et 34, disposés de part et d'autre des deux toiles. Entre le rouleau 27 et la presse 32, trois rouleaux 35, 36 et 37, constituent une genouillère pour les deux toiles. Sous la partie supérieure de la toile transporteuse inférieure 21, est disposé un bac 38 pour la récupération du liquide éliminé par égouttage et essorage. En aval de la presse 32 le dispositif comporte des moyens 39 pour l'élimination du liquide par évaporation. Ces moyens sont des caissons soufflant 40 et aspirant 41 un flux gazeux, disposés au dessus et en dessous des deux toiles. A chaque caisson soufflant fait face de l'autre côté des deux toiles un caisson aspirant. Ces caissons sont alimentés par de l'azote 42.The device shown in Figure 2 is used for the manufacture of a superabsorbent layer based on grafted cellulosic fibers. This device comprises a continuous support fabric 21, the upper part of which is kept tensioned between rollers, in particular an upstream roller 22 and a downstream roller 23. Rollers 24, 25 some of which 25, with adjustable position, act on the lower part of the canvas and allow it to be stretched correctly. A second porous fabric 26 is disposed above the first fabric, in parallel, being stretched between rollers, in particular an upstream roller 27 and a downstream roller 28. Rollers 29, 30 some of which 30, with adjustable position, correctly tension the fabric 26. A headbox 31 extends transversely above the lower conveyor fabric, upstream of the roller 27. The device also comprises a press 32, consisting of two rollers 33 and 34, arranged on either side of the two canvases. Between the roller 27 and the press 32, three rollers 35, 36 and 37 constitute a toggle for the two fabrics. Under the upper part of the lower conveyor fabric 21, a tank 38 is arranged for recovering the liquid eliminated by draining and spinning. Downstream of the press 32 the device comprises means 39 for removing the liquid by evaporation. These means are boxes blowing 40 and sucking 41 a gas flow, arranged above and below the two fabrics. On each other side of the two fabrics, there is a suction box facing each blowing fan. These boxes are supplied with nitrogen 42.

L'ensemble du dispositif est décrit en relation avec la fabrication d'une feuille de matériau cellulosique superabsorbant.The entire device is described in connection with the manufacture of a sheet of superabsorbent cellulosic material.

Une composition liquide 103 contenant des fibres cellulosiques modifiées sur lesquelles est chimiquement lié un polymère sous forme d'un sel de métal alcalin provenant d'un monomère polymérisable à insaturation oléfinique, dans un mélange d'alcool éthylique et d'ammoniaque, la concentration en matière sèche étant de 0,3 % environ, est amenée à la caisse de tête d'où elle est mise en feuille sur la toile transporteuse 21. La couche liquide est entraînée par ladite toile et elle est prise en sandwich entre cette toile 21 et la toile supérieure 26. Une partie du liquide 44 est éliminée par égouttage et essorage à travers la toile inférieure 21 et est récupérée dans le bac 38, sous la toile 21 pour être ensuite recyclée. L'essorage est accentué au passage de la genouillère. La couche toujours prise en sandwich entre les deux toiles passe ensuite entre les deux rouleaux de la presse, ce qui complète encore l'essorage. La couche passe ensuite entre les caissons soufflants et aspirants. A ce moment, un flux d'azote 42 traversant la toile supérieure élimine une partie supplémentaire du liquide par évaporation au contact du flux 42. Le courant gazeux d'azote chargé du mélange gazeux 47 d'alcool et d'ammoniaque traverse la toile inférieure, passe dans les caissons aspirants et est envoyé dans un dispositif annexe non représenté pour la récupération des vapeurs. A la sortie de la zone des caissons, la couche toujours maintenue entre les deux toiles est sèche. Après que la toile supérieure se soit détachée de la couche fibreuse, celle-ci quitte la toile inférieure pour venir s'enrouler à l'aide d'un dispositif enrouleur 45 sur une bobine 46.A liquid composition 103 containing modified cellulose fibers to which a polymer is chemically bonded in the form of an alkali metal salt originating from a polymerizable olefinically unsaturated monomer, in a mixture of ethyl alcohol and ammonia, the concentration of dry matter being about 0.3%, is brought to the headbox from where it is sheeted on the conveyor fabric 21. The liquid layer is entrained by said fabric and it is sandwiched between this fabric 21 and the upper fabric 26. Part of the liquid 44 is removed by draining and wringing through the lower fabric 21 and is recovered in the tank 38, under the fabric 21 to then be recycled. Spinning is accentuated as the knee switch passes. The layer still sandwiched between the two fabrics then passes between the two rollers of the press, which further completes the spin. The layer then passes between the blower and suction boxes. At this time, a stream of nitrogen 42 passing through the upper fabric eliminates an additional part of the liquid by evaporation in contact with the stream 42. The nitrogen gas stream charged with the gaseous mixture 47 of alcohol and ammonia passes through the lower fabric , passes into the suction boxes and is sent to an annex device, not shown, for the recovery of vapors. At the exit of the caissons area, the layer still maintained between the two fabrics is dry. After the upper fabric is detached from the fibrous layer, the latter leaves the lower fabric to be wound up using a winding device 45 on a spool 46.

Claims (11)

1. A method for the continuous production of a layer based upon cellulose fibres by a papermaking process, by casting of a liquid composition having a cellulose fibres content of less than approximately 10 % by weight onto a continuous, movable support (1, 21) which is porous to the liquid, followed by removal of the liquid from the layer formed by draining, wringing by pressing and evaporation, characterized in that all these operations of shaping and of removal of the liquid by draining, wringing and by evaporation, are carried out on the shaping support (1, 21) until a layer is obtained having a solids concentration exceeding approximately 30 %, ' having mechanical resistance properties sufficient to enable it to be reeled up, and in that the removal of the liquid by evaporation is achieved by passing a gaseous flow through the layer and said support (1, 21).
2. A method according to Claim 1, characterized in that the layer of cellulose fibres is sandwiched between the casting support (21) and a continuous, porous upper cloth (26), during at least a portion of the treatment for removal of the liquid.
3. A method according to Claim 2, characterized in that the layer is sandwiched throughout the entire treatment for removal of the liquid.
4. A method according to one of Claims 1 to 3, characterized in that it is applied to the production of a sheet based upon cellulose fibres having a unit weight less than 30 g/m2.
5. A method according to one of Claims 1 to 4, characterized in that it is applied to the production of a superabsorbent material based upon cellulose fibres grafted by means of an olefinically unsaturated polymerisable monomer having hydrolysable functional groups, the liquid to be eliminated comprising an alcohol chosen from ethyl alcohol, methyl alcohol and isopropyl alcohol.
6. A method according to Claim 5, characterized in that the evaporation of the liquid is carried out by passing a flow of nitrogen through the layer.
7. A method according to one of Claims 5 or 6, characterized in that the totality of the operations are carried out in an enclosure.
8. A method according to Claim 7, characterized in that a nitrogen atmosphere is maintained in the enclosure.
9. Apparatus for carrying out the method according to one of Claims 1 to 8, comprising a continuous shaping cloth (1, 21) porous to the liquid and movable, extending over the entire extent of the apparatus, means (4, 31) for depositing the liquid composition based upon cellulose fibres on the cloth, these means being situated above the upstream part of the shaping cloth means for removing a part of the liquid by draining, means (5, 6, 32) for removing another part of the liquid by wringing by means of pressing, means (8, 39) for removing another part of the liquid by evaporation by passage of a gaseous flow through the layer.
10. Apparatus according to Claim 9, characterized in that it comprises in addition a second cloth (26) which, associated with the shaping cloth (21), holds the layer to be treated as a sandwich over at least a part of the treatment apparatus.
11. Apparatus according to one of Claims 9 or 10, characterized in that the shaping cloth (21), the means (31) for depositing the liquid composition and the means (32, 39) for removing the liquid are situated in an enclosure (43).
EP85402383A 1984-12-17 1985-12-03 Process and apparatus for removing a liquid from a material obtained, in particular by a paper-making process Expired EP0188932B1 (en)

Priority Applications (1)

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AT85402383T ATE44784T1 (en) 1984-12-17 1985-12-03 METHOD AND APPARATUS FOR ELIMINATING A LIQUID FROM A MATERIAL ESPECIALLY OBTAINED BY A PAPER MAKING PROCESS.

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FR8419245 1984-12-17
FR8419245A FR2574829B1 (en) 1984-12-17 1984-12-17 PROCESS AND DEVICE FOR REMOVING LIQUID FROM A LAYER OBTAINED IN PARTICULAR BY A PAPER PROCESS

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EP0188932B1 true EP0188932B1 (en) 1989-07-19

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EP (1) EP0188932B1 (en)
JP (1) JPS61146400A (en)
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DE (1) DE3571663D1 (en)
DK (1) DK583185A (en)
ES (1) ES8606558A1 (en)
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FR (1) FR2574829B1 (en)
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ATE44784T1 (en) 1989-08-15
EP0188932A1 (en) 1986-07-30
DK583185A (en) 1986-06-18
FI854983A0 (en) 1985-12-16
PT81678B (en) 1987-10-20
ES8606558A1 (en) 1986-04-16
JPS61146400A (en) 1986-07-04
DE3571663D1 (en) 1989-08-24
FR2574829A1 (en) 1986-06-20
NO167163C (en) 1991-10-09
FI854983A (en) 1986-06-18
PT81678A (en) 1986-01-01
NO167163B (en) 1991-07-01
US4808266A (en) 1989-02-28
DK583185D0 (en) 1985-12-16
BR8506319A (en) 1986-08-26
ES549663A0 (en) 1986-04-16
FR2574829B1 (en) 1987-01-09
NO855054L (en) 1986-06-18

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