WO1987000091A1 - Application a arret de courte duree avec une grande quantite de pate excedentaire - Google Patents

Application a arret de courte duree avec une grande quantite de pate excedentaire Download PDF

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Publication number
WO1987000091A1
WO1987000091A1 PCT/FI1986/000076 FI8600076W WO8700091A1 WO 1987000091 A1 WO1987000091 A1 WO 1987000091A1 FI 8600076 W FI8600076 W FI 8600076W WO 8700091 A1 WO8700091 A1 WO 8700091A1
Authority
WO
WIPO (PCT)
Prior art keywords
paste
web
arrangement
amount
supplied
Prior art date
Application number
PCT/FI1986/000076
Other languages
English (en)
Inventor
Yngve Fundell
Original Assignee
Oy Wärtsilä Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from SE8503652A external-priority patent/SE8503652D0/xx
Application filed by Oy Wärtsilä Ab filed Critical Oy Wärtsilä Ab
Priority to PCT/FI1986/000076 priority Critical patent/WO1987000091A1/fr
Publication of WO1987000091A1 publication Critical patent/WO1987000091A1/fr
Priority to FI870948A priority patent/FI870948A/fi

Links

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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/40—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper only one side of the paper being in contact with the 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
    • D21H5/0012—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours
    • D21H5/0015—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating by bringing paper into contact with an excess of fluids, the paper carrying away only a part of the fluid material, e.g. by passing through liquids, gases or vapours only one side of the paper being in contact with the treating medium, e.g. paper carried by support

Definitions

  • the invention relates to an arrangement for the coating of a running material web quoted in the preamble of claim 1.
  • Paper, cardboard etc. are normally produced from natural cellulose fiber.
  • the paper production is a complicated process, which is started by the defibration of natural logs or other plant parts, fibre preparation and finally sheet formation.
  • the sheet formation one strives to distribute the fibers so evenly as possible.
  • the fibers are guided more near to each other and are linked, mainly through fluidum bonds.
  • the paper comprises fibres located in several layers, arbitrarily distributed. If one examines the paper through a magnifying glass, cavities are found between the fibers and the surface is found uneven - everything depending on the micro structure quoted above.
  • a common method for the surface levelling and the porocity reducing is the application of a layer on the top of the completed paper surface.
  • a normal method is to mix finely divided pigment, for instance clay, with water along with some binding substance, for instance latex, and thereafter to supply this paste on the paper web.
  • the surface smoothness is realized in that one doctors the paste by a trowel blade, a so called scraper knife. The doctored paper is hereafter dried, whereby the supplied paste is attached at the paper web through a certain penetration.
  • a normal coating method is the guiding of the paper web through a nip located between two drums, in which the paste is supplied by the partial immersion of the other drum in a machine bin filled with paste.
  • the paste excess is doctored off hereafter at a certain distance from the nip and the paste is levelled by a scraper knife.
  • the drum nip can also be replaced by a fountain or a so-called applicator.
  • Normal web speeds are 600-1000 m/min. but even higher speeds, up towards 2000 m/min are applied.
  • the paste excess during the doctoring is hereby often 10-20 ggr. This excess amount is resupplied in to a trough for the return to the machine bin.
  • a nip method has been developed during the past years, which combines the fountain application and the doctoring in to one member the so-called short " dwell technique.
  • a benefit hereby is the short distance between the paste application and the doctoring.
  • the so far constructed short dwell appliances comprise a defect, which is the minor paste excess amount realized. This is a result of the applied -technique, in which the eventual paste excess amount must be compressed out at the rear wall against the running direction of the paper web. This results even in a prolonged penetration extent than was intended for.
  • the object of the invention is to realize a development of the familiar short dwell appliances so, that the amount of the paste excess, which is supplied on the web, can be increased.
  • An object is also to realize an application with a favourably short penetration extent.
  • a further object is to create an arrang ⁇ ement in which the application paste flow is smoothly arranged in the application arrangement and air bubbles in the paste can be separated before the paste reaches the running web.
  • a big amount, in comparison to that paste amount attached at the web, of application paste is supplied on the web in the application chamber.
  • the application chamber is divided by a distributor in an inlet and an exit channel.
  • the paste is supplied on the web thereat, where the latter arrives in the application chamber, after which the paste follows along 'with the web to a doctor, which orms the front wail of the chamber, at which the excess paste is removed and guided in to the exit channel of the application chamber, for a resupply in the process.
  • the appli ⁇ cation of the paste with a normal paste excess amount can be done in an arrangement according to the invention. By this means a so-called skip-coating, among other things, is avoided, that is, uncoated surfaces on the paper web.
  • the doctor at the front edge of the application chamber is, according to a preferred embodiment, a so-called downstreams inclined scraper knife, which forms a sharp angle relative to the running web, in the web running direction.
  • An alternative embodiment comprises an upstreams inclined scraper knife of that type which is described in the Swedish Patent Application Nr. 85033 ⁇ 5- .
  • a benefit within this embodiment lies in that one avoids those rheoiogy phenomena, which are generated with a "downstreams" scraper knife. Furthermore, a free exit is realized for the recycle paste.
  • That gap which unavoidably must be found at the rear edge of the application chamber can be made quite small, that is, a gap so big only is left which is necessary for a free passage of the paper. Furthermore, this gap can be provided with, for instance, a small roil, in order to prevent a reverse paste flow. Other appliances can even be imagined for the prevention of the paste reverse flow. By such means an increased pressure can be available in the space, in which the application of the paste is carried out.
  • Figure 1 illustrates an embodiment of the invention in a side view
  • Figure 2 illustrates another embodiment of the invention in a side view
  • Figure 3 illustrates a third embodiment of the invention in a side view
  • Figure illustrates a fourth embodiment of the invention in a side view.
  • the reference A in the drawing refers to a guide or support drum rotating in the rotation direction 22, which carries a running material web 2.
  • Reference 1 refers to a ⁇ owing paste amount wnicn enters tne application arrangement through an inlet channel thereof.
  • Reference 9 refers to a rear edge seal of the application chamber, which in the embodiment according to Figure 1 comprises a knife.
  • Reference 6 refers to a distributor in the application chamber which divides the interior extent of the chamber in an inlet channel and an exit channel 7. Between the front edge of the distributor 6 and the running web is located a gap 13, through which the application paste flows.
  • Reference 3 refers to a doctor, for instance a scraper knife, which by means of an appliance 17 is compressed - against material web 2.
  • Application paste 1 is supplied on web 2, in the described arrangement, in the application chamber at that location, at which web 2 enters the application chamber at rear edge seal 9.
  • a big amount of paste 16 is supplied hereat on web 2, and follows along with it ail the way to doctor 3, whereat the excess amount is removed and the sur ace is levelled for the realization of the desired coating layer 5 on the web.
  • the removed excess amount streams hereafter through channel 7 in to a collector container 8 for a resuppiy in the • process.
  • distributor 6 is replaced by a distributor 15, which is movable in a direction 21 for the adjustment of gap 13 through an appliance 14.
  • the minor amount of excess paste amount 10 in the reverse flow direction, which penetrates through rear edge seal 9, is collected in a container 11.
  • the entire arrangment 18 is turnabie in a direction-of arrow 20, and hoistable and descendable in a direction of arrow 19, also.
  • rear edge seal 9 is repiaced ' Tay a roil 12 arranged rotatably, for a further reduction of the paste amount 10 in the reverse flow direction.
  • openings 23 are arranged in the inlet channel of the flowing paste for the separation of air bubbles from the paste. That amount of paste 2k, which hereby follows along with the air bubbles, is collected in the container 11.

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  • Paper (AREA)

Abstract

Agencement de revêtement d'une bande en défilement (2), par exemple d'un papier, d'un carton ou d'une bande analogue, à l'aide de ce que l'on appelle un applicateur à arrêt de courte durée (18), où l'application de la pâte, le raclage de la pâte et le nivelage de la couche de revêtement appliquée sont exécutés dans le même agencement et la quantité excédentaire de pâte appliquée est collectée de manière à la recycler. L'agencement comprend un joint étanche de bord arrière (9, 12) et un distributeur antérieur (6, 15), disposés de sorte que la pâte de revêtement est appliquée sur la bande là où cette dernière arrive dans l'agencement, et que par la suite la pâte s'écoule principalement dans le sens (22) de la bande de matériau (2) jusqu'à ce qu'elle rencontre une racle (3). La quantité de pâte appliquée (1) est, par conséquent, importante par rapport à la quantité (5) de pâte qui, collée et nivelée, se déplace avec la bande de matériau en défilement (2).
PCT/FI1986/000076 1985-07-05 1986-07-07 Application a arret de courte duree avec une grande quantite de pate excedentaire WO1987000091A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/FI1986/000076 WO1987000091A1 (fr) 1985-07-05 1986-07-07 Application a arret de courte duree avec une grande quantite de pate excedentaire
FI870948A FI870948A (fi) 1985-07-05 1987-03-04 Short-dwell-applicering med stort smetoeverskott.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE8503652-3 1985-07-05
SE8503652A SE8503652D0 (sv) 1985-07-05 1985-07-05 Short-dwell-applicering med stort smetoverskott
PCT/FI1986/000076 WO1987000091A1 (fr) 1985-07-05 1986-07-07 Application a arret de courte duree avec une grande quantite de pate excedentaire

Publications (1)

Publication Number Publication Date
WO1987000091A1 true WO1987000091A1 (fr) 1987-01-15

Family

ID=26160852

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1986/000076 WO1987000091A1 (fr) 1985-07-05 1986-07-07 Application a arret de courte duree avec une grande quantite de pate excedentaire

Country Status (1)

Country Link
WO (1) WO1987000091A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734900A1 (de) * 1987-05-07 1988-12-01 Voith Gmbh J M Einrichtung zum beschichten einer laufenden papier- oder kartonbahn
WO1988009700A1 (fr) * 1987-06-12 1988-12-15 A. Ahlstrom Corporation Procede et appareil d'enduction d'une bande de papier
EP0319503A2 (fr) * 1987-12-03 1989-06-07 Valmet Paper Machinery Inc. Procédé et dispositif pour l'application et le dosage d'une matière à étaler sur un substrat en mouvement
FR2627785A1 (fr) * 1988-01-29 1989-09-01 Valmet Paper Machinery Inc Dispositif pour le revetement d'une bande avec une composition de revetement
GB2227959A (en) * 1989-01-17 1990-08-15 Valmet Paper Machinery Inc Blade coating a material web
WO1990011136A1 (fr) * 1989-03-28 1990-10-04 Beloit Corporation Appareil d'enduction
EP0514735A1 (fr) * 1991-05-23 1992-11-25 J.M. Voith GmbH Dispositif de couchage du type à buse pour appliquer une masse de couchage sur une bande de papier
EP0761878A2 (fr) * 1995-09-01 1997-03-12 Voith Sulzer Papiermaschinen Gesellschaft mbH Dispositif d'application de matériau fluide ou pâteux sur une bande en mouvement, en particulier de papier ou carton
US5653401A (en) * 1993-05-14 1997-08-05 Fabio Perini S.P.A. Apparatus and method for applying a glue on a core for the winding of web material

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2545902A1 (de) * 1974-10-16 1976-04-29 Inventing Ab Verfahren und vorrichtung zum aufbringen einer streichmasse auf eine papierbahn
SE419946B (sv) * 1974-10-16 1981-09-07 Inventing Ab Sett och anordning for bestrykning av en lopande bana
US4357370A (en) * 1981-03-27 1982-11-02 Beloit Corporation Twin short dwell coater arrangement
US4452833A (en) * 1982-02-08 1984-06-05 Consolidated Papers, Inc. Paper coating method
DE3338095A1 (de) * 1983-10-20 1985-05-09 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung
DE3446525A1 (de) * 1984-01-07 1985-08-01 Jagenberg AG, 4000 Düsseldorf Vorrichtung zum beschichten von ueber eine stuetzwalze laufenden materialbahnen mit regelbarer auftragsstaerke
DE3420412A1 (de) * 1984-06-01 1985-12-05 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung zur beschichtung laufender warenbahnen

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2545902A1 (de) * 1974-10-16 1976-04-29 Inventing Ab Verfahren und vorrichtung zum aufbringen einer streichmasse auf eine papierbahn
SE419946B (sv) * 1974-10-16 1981-09-07 Inventing Ab Sett och anordning for bestrykning av en lopande bana
US4357370A (en) * 1981-03-27 1982-11-02 Beloit Corporation Twin short dwell coater arrangement
US4452833A (en) * 1982-02-08 1984-06-05 Consolidated Papers, Inc. Paper coating method
SE444895B (sv) * 1982-02-08 1986-05-20 Cons Paper Inc Bestrykningsanordning for beleggning av lopande materialbanor bestaende av en bestrykningskammare med en inre strypspalt
DE3338095A1 (de) * 1983-10-20 1985-05-09 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung
DE3446525A1 (de) * 1984-01-07 1985-08-01 Jagenberg AG, 4000 Düsseldorf Vorrichtung zum beschichten von ueber eine stuetzwalze laufenden materialbahnen mit regelbarer auftragsstaerke
DE3420412A1 (de) * 1984-06-01 1985-12-05 J.M. Voith Gmbh, 7920 Heidenheim Streicheinrichtung zur beschichtung laufender warenbahnen

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3734900A1 (de) * 1987-05-07 1988-12-01 Voith Gmbh J M Einrichtung zum beschichten einer laufenden papier- oder kartonbahn
US5018478A (en) * 1987-06-12 1991-05-28 A. Ahlstrom Corporation Method and apparatus for coating a paper web
WO1988009700A1 (fr) * 1987-06-12 1988-12-15 A. Ahlstrom Corporation Procede et appareil d'enduction d'une bande de papier
EP0319503A2 (fr) * 1987-12-03 1989-06-07 Valmet Paper Machinery Inc. Procédé et dispositif pour l'application et le dosage d'une matière à étaler sur un substrat en mouvement
EP0319503A3 (en) * 1987-12-03 1989-10-11 Valmet Paper Machinery Inc. Method and device for application and dosage of coating material onto a moving base
FR2627785A1 (fr) * 1988-01-29 1989-09-01 Valmet Paper Machinery Inc Dispositif pour le revetement d'une bande avec une composition de revetement
GB2227959B (en) * 1989-01-17 1992-10-14 Valmet Paper Machinery Inc Inverted blade metering unit and method for blade-coating a material web
GB2227959A (en) * 1989-01-17 1990-08-15 Valmet Paper Machinery Inc Blade coating a material web
US4961968A (en) * 1989-03-28 1990-10-09 Beloit Corporation Short dwell coater apparatus with backing blanket disposed between blade and guide roll
WO1990011136A1 (fr) * 1989-03-28 1990-10-04 Beloit Corporation Appareil d'enduction
EP0514735A1 (fr) * 1991-05-23 1992-11-25 J.M. Voith GmbH Dispositif de couchage du type à buse pour appliquer une masse de couchage sur une bande de papier
US5653401A (en) * 1993-05-14 1997-08-05 Fabio Perini S.P.A. Apparatus and method for applying a glue on a core for the winding of web material
EP0761878A2 (fr) * 1995-09-01 1997-03-12 Voith Sulzer Papiermaschinen Gesellschaft mbH Dispositif d'application de matériau fluide ou pâteux sur une bande en mouvement, en particulier de papier ou carton
EP0761878A3 (fr) * 1995-09-01 1997-06-25 Voith Sulzer Papiermasch Gmbh Dispositif d'application de matériau fluide ou pâteux sur une bande en mouvement, en particulier de papier ou carton
US5788771A (en) * 1995-09-01 1998-08-04 Voith Sulzer Papiermaschinen Gmbh Apparatus for applying a fluid or pastry medium to a continuous material web, particularly one made of paper or cardboard

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