EP0188932B1 - Verfahren und Vorrichtung zum Eliminieren einer Flüssigkeit aus einem Material insbesondere erhalten durch ein Papiermacherverfahren - Google Patents

Verfahren und Vorrichtung zum Eliminieren einer Flüssigkeit aus einem Material insbesondere erhalten durch ein Papiermacherverfahren 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
Authority
EP
European Patent Office
Prior art keywords
liquid
layer
evaporation
cloth
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85402383A
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English (en)
French (fr)
Other versions
EP0188932A1 (de
Inventor
André M. Faurie
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.)
Cellulose du Pin SA
Original Assignee
Cellulose du Pin SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cellulose du Pin SA filed Critical Cellulose du Pin SA
Priority to AT85402383T priority Critical patent/ATE44784T1/de
Publication of EP0188932A1 publication Critical patent/EP0188932A1/de
Application granted granted Critical
Publication of EP0188932B1 publication Critical patent/EP0188932B1/de
Expired legal-status Critical Current

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Classifications

    • 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)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Investigating Or Analysing Biological Materials (AREA)
  • Materials For Medical Uses (AREA)
  • Treatment Of Sludge (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Apparatus For Making Beverages (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Water Treatment By Sorption (AREA)
  • Laminated Bodies (AREA)

Claims (11)

1. Verfahren zur kontinuierlichen Herstellung einer Schicht auf Zellulosefaserbasis entsprechend einem Verfahren zur Papierherstellung, wobei eine flüssige Zusammensetzung mit einem Zellulosefasergehalt von weniger als etwa 10 Gew.-% auf einen flüssigkeitsdurchlässigen, beweglichen und kontinuierlichen Träger (1, 21) gegossen und danach die Flüssigkeit von der gebildeten Schicht durch Abtropfen, Preßentwässerung und Verdampfung entzogen wird, dadurch gekennzeichnet, daß all diese Arbeitsschritte, die die Fertigung der Schicht und das Entziehen der Flüssigkeit durch Abtropfen, Entwässerung und Verdampfung umfassen, auf dem Fertigungsträger (1, 21) ausgeführt werden, bis eine Schicht mit einer Konzentration von mehr als etwa 30 % an Feststoffen erreicht ist, die eine zum Aufrollen ausreichende mechanische Festigkeit aufweist, und daß das Entziehen der Flüssigkeit durch Verdampfen in der Art und Weise erfolgt, daß ein gashaltiger Strom durch die Schicht und den Träger (1, 21) geleitet wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Zellulosefaserschicht sandwichartig zwischen dem Träger (21) und einem darüber angeordneten porösen Endlosband (26) während wenigstens eines Teils der Prozedur zur Flüssigkeitsentziehung aufgenommen wird.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Schicht während der gesamten Prozedur zur Flüssigkeitsentziehung sandwichartig aufgenommen wird.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß es für die Herstellung eines Bogens auf Zellulosefaserbasis mit einer Flächenmasse von weniger als 30 g/m2 angewendet wird.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß es für die Herstellung eines hochabsorptionsfähigen Materials auf der Basis von Zellulosefasern verwendet wird, die mit Hilfe eines olefinisch ungesättigten, polymerisierbaren, hydrolisierfähige funktionelle Gruppen aufweisenden Monomers behandelt wurden, wobei die zu entfernende Flüssigkeit einen Alkohol aus der Gruppe Ethylalkohol, Methylalkohol oder Isopropylalkohol enthält.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß die Verdampfung der Flüssigkeit in der Art und Weise erzielt wird, daß ein Stickstoffstrom durch die Schicht hindurchgeleitet wird.
7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß alle Arbeitsschritte in einem abgeschlossenen Raum ausgeführt werden.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß der abgeschlossene Raum in eine Stickstoffatmosphäre getaucht ist.
9. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 8, umfas-. send ein flüssigkeitsdurchlässiges, umlaufendes endloses Fertigungsband (1, 21), das sich über die gesamte Länge der Vorrichtung erstreckt, ferner Einrichtungen (4, 31) für das Aufbringen der flüssigen Zusammensetzung auf Zellulosefaserbasis auf das Band, wobei diese Einrichtungen oberhalb des Laufbeginnes des Fertigungsbandes angeordnet sind, Einrichtungen zum Entziehen eines Teils der Flüssigkeit durch Abtropfen, Einrichtungen (5, 6, 32) zum Entziehen eines weiteren Teils der Flüssigkeit durch Preßentwässerung, und Einrichtungen (8, 39) zum Entziehen eines weiteren Teils der Flüssigkeit durch Verdampfung mit Hilfe eines gashaitigen Stromes, der durch die Schicht hindurchgeleitet wird.
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß sie ferner ein zweites Band (26) aufweist, das in Verhindung mit dem Fertigungsband (21) die zu bearbeitende Schicht sandwichartig auf wenigstens einem Teil der Bearbeitungsvorrichtung aufnimmt.
11. Vorrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß das Fertigungsband (21), die Einrichtungen (31) zum Aufbringen der flüssigen Zusammensetzung und die Einrichtungen (32, 39) zum Entziehen der Flüssigkeit in einem abgeschlossenen Raum (43) angeordnet sind.
EP85402383A 1984-12-17 1985-12-03 Verfahren und Vorrichtung zum Eliminieren einer Flüssigkeit aus einem Material insbesondere erhalten durch ein Papiermacherverfahren Expired EP0188932B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85402383T ATE44784T1 (de) 1984-12-17 1985-12-03 Verfahren und vorrichtung zum eliminieren einer fluessigkeit aus einem material insbesondere erhalten durch ein papiermacherverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8419245A FR2574829B1 (fr) 1984-12-17 1984-12-17 Procede et dispositif pour l'elimination du liquide d'une couche obtenue notamment par un procede papetier
FR8419245 1984-12-17

Publications (2)

Publication Number Publication Date
EP0188932A1 EP0188932A1 (de) 1986-07-30
EP0188932B1 true EP0188932B1 (de) 1989-07-19

Family

ID=9310659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85402383A Expired EP0188932B1 (de) 1984-12-17 1985-12-03 Verfahren und Vorrichtung zum Eliminieren einer Flüssigkeit aus einem Material insbesondere erhalten durch ein Papiermacherverfahren

Country Status (12)

Country Link
US (1) US4808266A (de)
EP (1) EP0188932B1 (de)
JP (1) JPS61146400A (de)
AT (1) ATE44784T1 (de)
BR (1) BR8506319A (de)
DE (1) DE3571663D1 (de)
DK (1) DK583185A (de)
ES (1) ES8606558A1 (de)
FI (1) FI854983A (de)
FR (1) FR2574829B1 (de)
NO (1) NO167163C (de)
PT (1) PT81678B (de)

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AT394739B (de) * 1989-06-09 1992-06-10 Andritz Ag Maschf Vorrichtung zur entwaesserung einer zellstoffbahn bzw. einer materialbahn fuer eine pappenerzeugung
JPH0445898A (ja) * 1990-06-14 1992-02-14 Yukimasa Sato 汚泥やスラッジ等の脱水装置及びその脱水方法
US5225042A (en) * 1991-12-02 1993-07-06 Beloit Technologies, Inc. Twin wire paper forming section with heated air pressure domes
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US5667636A (en) * 1993-03-24 1997-09-16 Kimberly-Clark Worldwide, Inc. Method for making smooth uncreped throughdried sheets
US5399412A (en) * 1993-05-21 1995-03-21 Kimberly-Clark Corporation Uncreped throughdried towels and wipers having high strength and absorbency
US5607551A (en) * 1993-06-24 1997-03-04 Kimberly-Clark Corporation Soft tissue
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US6423183B1 (en) 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
DE19820585A1 (de) * 1998-05-08 1999-11-11 Voith Sulzer Papiertech Patent Auftragsverfahren und -vorrichtung
US6375799B1 (en) * 1999-01-28 2002-04-23 Voith Sulzer Papiertechnik Patent Gmbh Process and apparatus for producing a fibrous material web
US6379498B1 (en) * 2000-02-28 2002-04-30 Kimberly-Clark Worldwide, Inc. Method for adding an adsorbable chemical additive to pulp during the pulp processing and products made by said method
US6749721B2 (en) 2000-12-22 2004-06-15 Kimberly-Clark Worldwide, Inc. Process for incorporating poorly substantive paper modifying agents into a paper sheet via wet end addition
US6582560B2 (en) 2001-03-07 2003-06-24 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
US7749356B2 (en) * 2001-03-07 2010-07-06 Kimberly-Clark Worldwide, Inc. Method for using water insoluble chemical additives with pulp and products made by said method
US6736935B2 (en) * 2002-06-27 2004-05-18 Kimberly-Clark Worldwide, Inc. Drying process having a profile leveling intermediate and final drying stages
US6916402B2 (en) * 2002-12-23 2005-07-12 Kimberly-Clark Worldwide, Inc. Process for bonding chemical additives on to substrates containing cellulosic materials and products thereof
US7670459B2 (en) * 2004-12-29 2010-03-02 Kimberly-Clark Worldwide, Inc. Soft and durable tissue products containing a softening agent
US7749355B2 (en) * 2005-09-16 2010-07-06 The Procter & Gamble Company Tissue paper
US20070256802A1 (en) * 2006-05-03 2007-11-08 Jeffrey Glen Sheehan Fibrous structure product with high bulk
US7744723B2 (en) * 2006-05-03 2010-06-29 The Procter & Gamble Company Fibrous structure product with high softness
BR112013024195A2 (pt) * 2011-03-25 2016-12-13 Nanopaper Llc formulações solventes para fabricação de papel

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Also Published As

Publication number Publication date
NO167163C (no) 1991-10-09
FR2574829B1 (fr) 1987-01-09
FI854983A (fi) 1986-06-18
DE3571663D1 (en) 1989-08-24
ES549663A0 (es) 1986-04-16
DK583185D0 (da) 1985-12-16
US4808266A (en) 1989-02-28
PT81678A (fr) 1986-01-01
ATE44784T1 (de) 1989-08-15
NO855054L (no) 1986-06-18
PT81678B (pt) 1987-10-20
JPS61146400A (ja) 1986-07-04
ES8606558A1 (es) 1986-04-16
DK583185A (da) 1986-06-18
EP0188932A1 (de) 1986-07-30
FR2574829A1 (fr) 1986-06-20
NO167163B (no) 1991-07-01
BR8506319A (pt) 1986-08-26
FI854983A0 (fi) 1985-12-16

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