EP0117212B1 - Vorrichtung zur Beschichtung einer Folie oder eines Bandes in kontinuierlicher Bewegung - Google Patents

Vorrichtung zur Beschichtung einer Folie oder eines Bandes in kontinuierlicher Bewegung Download PDF

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Publication number
EP0117212B1
EP0117212B1 EP84420010A EP84420010A EP0117212B1 EP 0117212 B1 EP0117212 B1 EP 0117212B1 EP 84420010 A EP84420010 A EP 84420010A EP 84420010 A EP84420010 A EP 84420010A EP 0117212 B1 EP0117212 B1 EP 0117212B1
Authority
EP
European Patent Office
Prior art keywords
sheet
tank
slot
composition
coating
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
EP84420010A
Other languages
English (en)
French (fr)
Other versions
EP0117212A1 (de
Inventor
Michel Richard
Alain Angogna
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.)
Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
Original Assignee
Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
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 Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES" filed Critical Centre Technique Industriel dit "CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSES"
Priority to AT84420010T priority Critical patent/ATE21053T1/de
Publication of EP0117212A1 publication Critical patent/EP0117212A1/de
Application granted granted Critical
Publication of EP0117212B1 publication Critical patent/EP0117212B1/de
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/0042—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by pouring or allowing to flow in a continuous stream onto the surface, the entire stream being carried away by the paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades

Definitions

  • the invention relates to a device for coating a continuously moving sheet or strip, such as for example a sheet of paper, cardboard, a film or a fabric, using a composition. liquid or in the form of foam.
  • coating is a treatment operation which consists in coating at least one of the faces of a sheet in continuous movement with an appropriate layer, in order to modify its properties, in particular of surface and / or its properties. mechanical.
  • coating is a treatment operation which consists in coating at least one of the faces of a sheet in continuous movement with an appropriate layer, in order to modify its properties, in particular of surface and / or its properties. mechanical.
  • the device according to the invention can also find applications for other uses, such as for example the coating of films or 'fabrics.
  • the regularity of the deposit is not always constant due to the friction of the sheet on an appreciable surface of the reservoir, which results in a defect in spreading of the coating layer, a defect known under the name of “Orange peel.
  • this device is limited to very fluid compositions, since it does not include any means for equalizing the deposited layer.
  • the "dosage is the operation which consists in depositing a determined quantity of composition on a sheet
  • equalization is the operation which consists in uniformly distributing this quantity deposited on the surface of the sheet.
  • the coating device characteristic of the invention, and for example in the case where a foam is applied, essentially consists of a supply tank (10) in which the coating composition is placed with a foaming agent. This composition is then brought to a foam generator (11), of a type known per se. Using a pipe (13), the foamed composition is brought to a stainless steel tube (14) forming a supply reservoir for the composition.
  • This tube (14) limited at its two ends by size limiters (15) and (16) or the like, such as end drawers, is arranged transversely relative to the direction of advance F of a sheet of paper (17).
  • This reservoir (14) has an opening in the form of a rectilinear slot (18) disposed longitudinally relative to the reservoir and in the vicinity of the place where the moving sheet (17) is applied to this reservoir (14).
  • the foamed composition is pulsed by a pump, not shown, first in a box (12), then from there to the tank (14), more precisely in the supply chamber which will be detailed later. From there, it leaves regularly through the slot (18) to deposit on the moving sheet (17).
  • the coating device consists essentially of an elongated body (20) which, in cross section, takes the form of an arc formed in a material having an excellent coefficient of friction opposite the sheet to be coated (17), excellent resistance to wear and does not deform under the effect of heat.
  • This body or sector (20) may for example be made of plastic, of the polyamide or polycarbonate type, or even of metal.
  • the latter In the area (21) where the sheet (17) comes into contact with this sector (20), the latter has grooves (22, 23, 24) relatively close to each other, not very wide and not very deep. It has been found that for example, for a tank of one hundred millimeters in diameter, three grooves spaced from each other by about fifteen millimeters, two millimeters wide and two millimeters deep gave satisfactory results.
  • Their length is greater than the width of the sheet to be treated and they can be interconnected by other grooves (25) shown in Figure 2. It is necessary that, as already said, the length of these grooves is greater than the width of the sheet to be treated, so that the boundary air layer formed on the moving sheet (17) is eliminated in contact with these grooves (22, 23, 24, 25), then evacuated by the ends of these grooves.
  • the angle of attack formed by the sheet relative to the sector (20) is variable depending on the configuration of the machine. It is desirable that this angle is as open as possible, in order to have minimum friction. However, this angle must be compatible with the fact that the sheet of paper (17) must pass in contact with the grooves (22, 23, 24) intended to evacuate the boundary air layer. To do this, in practice, excellent results are obtained with an angle of between 15 and 30 °, preferably close to 20 °.
  • the body or sector (20) rests by means of fixing screws on a base (26), for example made of stainless steel, which is fixed to the frame by a nut (27) and a threaded rod (28).
  • the supply tube (13) opens onto the side wall of the tube (14). From there, the composition, in particular in the form of foam, enters a generally L-shaped supply chamber (30) whose walls gradually converge towards the slit, so as to bring the coating composition in a regular and homogeneous manner. slot.
  • This slot (18) is arranged just downstream of the axis of symmetry AB.
  • the width of the slot (18), that is to say the distance between the inlet wall (31) and the bevelled blade (33) is most reduced. Excellent results are obtained with widths between five and twenty millimeters, preferably close to ten. In this way, during this journey, which lasts approximately 10- 3 seconds, the sheet (17) has practically no time to impregnate, therefore to become brittle, which allows in combination with the angle ⁇ d ' obtain an optimum dosing effect.
  • this cap (20) with the slot (18) and the blade (33) is interchangeable, which thus makes it possible to have assemblies with blades (33) of different inclination, than the it can conveniently be placed on the coating device by a quick attachment system.
  • the inclined equalizing-dosing blade (33) is applied by a movable wedge (34) to a blade-holder angle (35) integral with the part (36) downstream of the body (20).
  • a screw (37) which is rotated, the corner (34) is made to slide thanks to the space provided in (38).
  • the exit angle ⁇ of the coated sheet (40) relative to the direction of the bevel (42) must be sufficiently open to ensure good tension of the sheet which presses it on the bevel, It must not however be too open , in order to avoid contact of the coated layer on the body of the tube (14).
  • this angle is that formed by the sheet (17) and the bearing surface of the bevel (42) of the blade (33). In practice, this angle should be between approximately 5 and approximately 50 °. If this angle is too closed, we will no longer control the regularity of the deposition of the composition. On the other hand, if this angle is too open, the sheet (17) will be scraped, which will cause significant risks of breakage. In practice, this angle ⁇ may advantageously be close to 30 °.
  • the slot (18) is located just downstream of the axis of symmetry AB, so that when the coated sheet (40) leaves the device, there is no more contact between this device and sheet (40).
  • the walls of the chamber (30) are convergent so that the liquid composition or the pressure coating foam advances in a regular and homogeneous manner to the slot (18). .
  • this convergence must be progressive so as to avoid any stagnation in the composition.
  • the tube (14) includes pressure sensors which are connected to a central member connected to the foam generator (11), so as to ensure a regular flow of the composition.
  • these sensors then immediately transmit information to the central control unit which then corrects the flow rate of the generator (11).
  • membrane sensors or piezo sensors are used for this.
  • the active surface of these sensors can be arranged on the vertical portion shim of the supply chamber (30).
  • a box (12) is placed on the conduit (13), possibly connected to a pressure sensor.
  • the periphery (50) of the tube (14) forms a stator. Inside the tube (14) is a cylinder (51) forming a rotor and driven in movement by a suitable motor, not shown.
  • the gap between the stator (50) and the rotor (51) forms a chamber (52) into which the treatment composition is supplied by suitable means. Advancing in this chamber (52), due to the rotation of the rotor (51), the composition is sheared and, in the case of pseudoplastic or thirotropic compositions, its viscosity decreases.
  • the outer wall of the stator has longitudinal grooves (22, 23) intended to eliminate the layer of boundary air which forms upstream of the axis of symmetry AB and comprises downstream a straight longitudinal slot ( 18) associated with an inclined, bevelled blade (33), fixed by any means to the stator (50).
  • the excess of sheared composition is then evacuated by a channel (54) provided with a non-return blade (55) which prevents the sheared composition from returning to the point of supply of the composition with high viscosity.
  • the channel (54) is provided with a valve (56) which keeps the supply chamber (52) under pressure.
  • This device is particularly advantageous for coating by means of compositions with high viscosity.
  • the rotor (51) can be heated, to further promote the decrease in viscosity.
  • the arrival of the composition in the chamber (52) can be carried out by any suitable means, for example means of the manifold type.
  • compositions which can be used are liquid or are in the form of a foam. These compositions contain mineral and / or organic pigments in dispersion, mixed with binders, such as CMC, starch, latex and the most diverse additives. It is also possible according to the invention to coatings by means of hot-melts.
  • the slot (18) has a length of fifty centimeters and a width (distance: 31, 33) of ten millimeters.
  • a fluid composition containing 10% by weight of starch in water (viscosity: 100 mPa - s), is deposited on a sheet of paper using a device according to Figure 3 about four grams per square meter in dry products. This improves the surface properties.
  • a composition is deposited, this time no longer 10, but 20% by weight of starch. Thanks to the shearing effected in the chamber (52), a reduction in the viscosity is caused and a layer weight comparable to that obtained in Example 1 is deposited on the paper, while having less energy to provide for the subsequent drying of the coated sheet.
  • Example 1 is repeated, but this time no longer using a fluid composition, but a foam composition using the apparatus (11). A similar quantity of material is deposited and the surface properties of the paper are improved in a greater proportion. In addition, a substantial gain in drying energy is achieved.
  • the use of the device with a foamed composition has the advantage of consuming all that is provided by the slit and the air included in the bubbles is entrained by the sheet and / or through this sheet.
  • a sheet of paper is pre-coated using a conventional composition based on latex and calcium carbonate at a concentration of 70% in dry matter.
  • the coating can be carried out at speeds of at least 800 m / min in order to deposit layer weights of 7 to 12 g / m 2 surface.
  • the paper thus treated has a very regular surface.
  • the coating of a paper with poor appearance is carried out in the same way as in Example 4, but by increasing the quantity deposited.
  • the composition spreads excellently.
  • the treated paper does not exhibit any defect in surface appearance. This is due in particular to the fact that the device according to the invention does not include a back-pressure roller.
  • the invention can be used advantageously for all coating treatments such as surfacing, pre-coating, coating, bonding, treatment with hot-melts.
  • the composition can be either liquid or in the form of a foam.
  • the invention can also be used in an aqueous medium or in a solvent medium, in particular for the treatment of tissues.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Meat, Egg Or Seafood Products (AREA)

Claims (4)

1. Vorrichtung zur Beschichtung einer Papierbahn oder einer Folie (17) in kontinuierlicher Bewegung mit einer unter Druck stehenden, flüssigen oder schaumförmigen Masse, bestehend aus
einem Behälter (14) zum Zuführen der unter Druck stehenden Beschichtungsmasse, der quer zur Bewegungsrichtung der Folie (17) angeordnet ist und teilweise von der Folie umschlungen wird, der eine Öffnung in Form eines geradlinigen Schlitzes (18) nahe der Stelle aufweist, an der die sich bewegende Folie (17) den Behälter (14) berührt, und durch den hindurch die Beschichtungsmasse austritt,
einer Einrichtung zum Absaugen der LuftGrenzschicht, die von der bewegten, unbeschichteten Folie (17) mitgeführt wird, welche Einrichtung in Bewegungsrichtung der Folie dicht vor der Zone angeordnet ist, in der die Folie (17) mit dem Behälter (14) in Berührung kommt, und
einer Einrichtung (33) zum gleichzeitigen Dosieren und Egalisieren der durch den Schlitz (18) ausgegebenen Beschichtungsmasse, welche Einrichtung unmittelbar hinter dem Schlitz und parallel zu diesem angeordnet ist und an der sich die beschichtete Folie abstützt,
dadurch gekennzeichnet,
daß der Oberflächenabschnitt des Behälters (14), der der sich bewegenden Folie (17) zugewandt ist, im Querschnitt gesehen die Form eines Kreisbogens hat, dessen konvexe Seite der Folie (17) zugewandt ist, und der geradlinige Schlitz (18) in diesem, einen kreisbogenförmigen Querschnitt aufweisenden Abschnitt des Behälters angeordnet ist, und
daß die Einrichtung zum Absaugen der LuftGrenzschicht von der sich bewegenden Folie aus Längsnuten (22, 23, 24) besteht, die in den Oberflächenabschnitt (20) des Behälters (14) mit kreisbogenförmigem Querschnitt unmittelbar vor der die Form eines geradlinien Schlitzes (18) aufweisenden Öffnung angebracht sind, deren Länge größer ist als die Breite der Folie (17) und die miteinander verbunden sind.
2. Vorrichtung zur Beschichtung einer Bahn oder einer Folie (17) in kontinuierlicher Bewegung nach Anspruch 1, dadurch gekennzeichnet, daß der von der sich bewegenden Folie (17) umschlungene, einen kreisbogenförmigen Querschnitt aufweisende Abschnitt (20) des Behälters (14) aus einem Material besteht, das gegenüber der Folie einen geringen Reibungskoeffizienten aufweist.
3. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die Wände der im Behälter (14) angeordneten Kammer (30) zum Zuführen der Beschichtungsmasse, die in die schlitzförmige Öffnung (18) münden, sich in Richtung auf den Schlitz aneinander annähern.
4. Vorrichtung nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß die im Behälter (14) angeordnete und an den Schlitz (18) angeschlossene Kammer (52) zum Zuführen der Beschichtungsmasse eine Einrichtung enthält, durch die die Beschichtungsmasse einer Scherung unterworfen wird, um die Viskosität der Beschichtungsmasse zu vermindern, welche Einrichtung aus einem Stator in Form eines hohlen Zylinders (50), in den die Beschichtungsmasse mit hoher Viskosität einläuft, und einem Rotor in Form eines umlaufenden, zum Stator (50) konzentrischen inneren Zylinders (51) besteht, bei der die Scherung das Ergebnis der Rotation des Rotors (51) im Stator (50) ist.
EP84420010A 1983-02-04 1984-01-26 Vorrichtung zur Beschichtung einer Folie oder eines Bandes in kontinuierlicher Bewegung Expired EP0117212B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84420010T ATE21053T1 (de) 1983-02-04 1984-01-26 Vorrichtung zur beschichtung einer folie oder eines bandes in kontinuierlicher bewegung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8301991A FR2540406B1 (fr) 1983-02-04 1983-02-04 Dispositif d'enduction d'une feuille ou d'une bande en deplacement continu
FR8301991 1983-02-04

Publications (2)

Publication Number Publication Date
EP0117212A1 EP0117212A1 (de) 1984-08-29
EP0117212B1 true EP0117212B1 (de) 1986-07-30

Family

ID=9285721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84420010A Expired EP0117212B1 (de) 1983-02-04 1984-01-26 Vorrichtung zur Beschichtung einer Folie oder eines Bandes in kontinuierlicher Bewegung

Country Status (5)

Country Link
EP (1) EP0117212B1 (de)
AT (1) ATE21053T1 (de)
DE (1) DE3460364D1 (de)
FI (1) FI840452A (de)
FR (1) FR2540406B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446757A1 (de) * 1984-11-17 1986-05-22 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8412292D0 (en) * 1984-05-14 1984-06-20 Dynamelt Ltd Coating applicator head
AT394668B (de) * 1984-11-17 1992-05-25 Voith Gmbh J M Einrichtung zum beschichten laufender warenbahnen mit einer streichmasse
US4912948A (en) * 1985-03-22 1990-04-03 Union Carbide Chemicals And Plastics Company Inc. Vacuum guide used in flexible sheet material treatment
US4581254A (en) * 1985-03-22 1986-04-08 Union Carbide Corporation Foam applicator used in paper treatment
DE3525805A1 (de) * 1985-07-19 1987-01-29 Hesselmann Planatolwerk H Vorrichtung zum auftragen eines klebstoffes in form einer queranleimung
JPH0677711B2 (ja) * 1986-07-15 1994-10-05 富士写真フイルム株式会社 塗布装置
DE3839100A1 (de) * 1988-11-18 1990-05-23 Bematec S A Beschichtungsvorrichtung fuer materialbahnen
FI90634C (fi) * 1989-01-17 1994-03-10 Valmet Paper Machinery Inc Sivelylaite ja menetelmä materiaalirainan sivelemiseksi
US6406752B1 (en) 2000-02-14 2002-06-18 The Procter & Gamble Company Extrusion die having dynamic flow inducer
WO2003040473A2 (en) * 2001-11-05 2003-05-15 Kimberly-Clark Worldwide, Inc. Foam treatment of tissue webs
US6730171B2 (en) 2001-11-05 2004-05-04 Kimberly-Clark Worldwide, Inc. Nozzle apparatus having a scraper for the application of the foam treatment of tissue webs
DE102022101266A1 (de) 2022-01-20 2023-07-20 Voith Patent Gmbh Verfahren und Auftragsvorrichtung zum Auftrag von aufgeschäumten, flüssigen und pastösen Auftragsmedien auf eine bewegende Auftragsfläche

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US3227136A (en) * 1961-10-26 1966-01-04 Eastman Kodak Co Extrusion coating apparatus
FR2000001A1 (de) * 1968-07-31 1969-08-29 Eastman Kodak Co
DE2055405B2 (de) * 1970-11-11 1973-10-04 Joseph Eck & Soehne, 4000 Duesseldorf Vorrichtung zum Auftragen von Beschi chtungsmassen auf bahnförmige Trager
SE383007B (sv) * 1973-03-02 1976-02-23 Svenska Cellulosa Ab Sett att framstella ytbehandlat papper i form av en kontinuerlig bana
SE416970C (sv) * 1977-01-03 1985-03-18 Inventing Ab Sett for att behandla eller bestryka ytor, exempelvis lopande materialbanor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3446757A1 (de) * 1984-11-17 1986-05-22 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung
DE3446757C2 (de) * 1984-11-17 1995-05-24 Voith Gmbh J M Streicheinrichtung

Also Published As

Publication number Publication date
FI840452A (fi) 1984-08-05
FI840452A0 (fi) 1984-02-03
DE3460364D1 (en) 1986-09-04
FR2540406B1 (fr) 1986-10-31
ATE21053T1 (de) 1986-08-15
FR2540406A1 (fr) 1984-08-10
EP0117212A1 (de) 1984-08-29

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