EP1095187B1 - Procede et dispositif pour ameliorer la surface de couchage de bandes de papier - Google Patents

Procede et dispositif pour ameliorer la surface de couchage de bandes de papier Download PDF

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Publication number
EP1095187B1
EP1095187B1 EP99932773A EP99932773A EP1095187B1 EP 1095187 B1 EP1095187 B1 EP 1095187B1 EP 99932773 A EP99932773 A EP 99932773A EP 99932773 A EP99932773 A EP 99932773A EP 1095187 B1 EP1095187 B1 EP 1095187B1
Authority
EP
European Patent Office
Prior art keywords
paper
web
coating
film press
coating material
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 - Lifetime
Application number
EP99932773A
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German (de)
English (en)
Other versions
EP1095187A1 (fr
Inventor
Guido Dessauer
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.)
DESSAUER, GUIDO PROF. DR.
Original Assignee
BTG Eclepens 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 BTG Eclepens SA filed Critical BTG Eclepens SA
Publication of EP1095187A1 publication Critical patent/EP1095187A1/fr
Application granted granted Critical
Publication of EP1095187B1 publication Critical patent/EP1095187B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H23/30—Pretreatment of the paper

Definitions

  • the paper webs are marked with a watery coating slip, also called coating color, spread.
  • the coating colors consist of one or a mixture of different ones inorganic pigments and are made with one or a mixture of organic binders. It is known, these coating colors with so-called film presses on the Transfer paper webs. The coating color is on or applied to a rubber roller on both sides and then transferred from this roller or these rollers to the paper web. At the end of the contact with the coating slip Paper web cleavage occurs in the coating slip film. With this separation of a more or less viscous coating slip in itself, known rheological problems occur on the so-called flow lines or the orange peel effect to lead.
  • FR-A-1 447 984 describes a method for improving the Adhesion of a polyolefin film on a paper web known to to improve adhesion, the paper web with a high-frequency corona discharge is treated.
  • Such Corona discharge device is not suitable for the orange peel effect and the spray when coating base paper to improve with an aqueous coating slip in film presses.
  • From US-A-4,576,831 is also a method for treatment a paper web with a high-frequency corona discharge known with which the adhesion of the coating slip improved shall be.
  • a film press there is no need to improve the adhesion, since this is already done by the pressure effect of the film press rollers.
  • US Pat. No. 3,498,865 describes the application of a polyfin layer known on a raw paper web, in which in a contact zone the melted polyfin in a limited electrical field is applied. Such a device is not suitable an aqueous coating slip with high throughput speeds apply evenly to a raw paper web.
  • the invention is therefore based on the object, the coating surface to improve the paper webs produced and to minimize the spray.
  • the invention has the advantage that with this method aqueous coating slip a more closed surface of the Dashes and therefore improved printability of the paper is achievable. Furthermore, one achieves with the inventive Process a printability that was previously only possible with thicker ones Stroke orders were possible, so that printed products can be produced with a lower mass per unit area are. Because these watery applied to film presses Coating compounds allow thinner strokes to be made with them Printed matter advantageously also more environmentally friendly dispose.
  • FIG. 1 of the drawing shows a schematic film press, through which the paper web 8 runs and on one side with an aqueous coating slip is provided, the counter roller 1 positive by an electric charging device ionized and therefore attractive for the anionic coating slip becomes.
  • the film press consists of two film press rollers, the the lower one represents the application roller 3 and the upper one the counter roller 1, which are both provided with a rubber covering.
  • the rollers 1, 3 are driven in opposite directions and transported between its contact surfaces, the paper web 8 in a predetermined Direction.
  • the application roller 3 of the film press is with a Pre-coating device 4, through which the coating slip is applied to the application roller 3.
  • the coating slip becomes even, for example, with a known squeegee applied to the surface of the application roller 3 and taken in the direction of rotation as film 6 on the roller 3 and on the lower side 2 of the paper web 8 passing through it. Since the two rollers 1, 3 against each other under a predetermined pressure run, the aqueous coating slip is partially dewatered, so that a certain layer of the coating slip on the lower paper web side 2 is applied.
  • the pre-coating device 4 which optimally distributes the coating slip an electrode (cathode) 5 and is with the dispersed coating slip, which as electrokinetic System can be considered in electrical contact.
  • the negative pole is a voltage source 9 with this Electrode 5 connected.
  • On the counter roller 1 is a co-rotating Metal roller 7 arranged as a second electrode (anode) acts and connected to the positive pole of the DC voltage source 9 is.
  • the rubber covering of the upper film press roller 1 is made made of an electrically conductive rubber mixture, so that the Paper 8 is charged with a positive electrical charge becomes.
  • the electrodes 5, 7 and the voltage source 9, as well as an electrically conductive roller coverings Charging device electrical charging, a DC voltage source 9 is selected, which provides a voltage of approximately 150 to 2,000 V. With others Embodiments can also handle higher voltages 10,000 V can be used.
  • Fig. 2 of the drawing shows schematically a film press for coating a paper web on both sides. This is what it is about essentially a film press as shown in FIG Drawing described with various additional devices is provided in order to enable a double-sided coating. The same parts are therefore also with the provided with the same reference numerals as in Fig. 1 of the drawing.
  • two film press rolls 1, 3 are shown, which are both designed as application rollers and through their contact surfaces, the paper web 8 continuously passes.
  • the Paper web 8 wetted on both sides with coating slip.
  • This is on a pre-coating device 4, 4a is provided for each application roller 1, 3, by the help of a known, not shown Doctor device on the surface of the application rollers 3, 1 evenly spread the coating slip.
  • This creates a film 6, 6a of coating slip on the roller surfaces, the partially on both sides 2, 2a of the passing Paper web 8 is applied.
  • the two pre-coating devices 4, 4a connected to a DC voltage source 9.
  • the pre-coating devices 4, 4a electrodes (cathodes) represents that with the disperse coating slip that acts as an electrokinetic System can be viewed in electrical Are in contact.
  • two guide rollers 7a, 7b are provided whose contact surfaces the paper web 8 runs and the application rollers 1, 3 is supplied.
  • These guide rollers exist made of electrically conductive material or are with an electrical conductive surface material coated. Stand there at least these conductive roller surfaces with the DC voltage source 9 and represent the opposite Electrode (anode). In this way, the continuous Paper web 8 with a positive electrical charge charged.
  • a film press is shown schematically, through which a two-sided order on the paper web 23 is reached. They are used as an electrical charging device two spray electrodes (corona generators) 13, 17 are provided, the opposite charge of the paper web 23 opposite of the coating slip.
  • the paper web 23 is one Deflection roller 16 transported to a first guide roller 15. This guide roller 15 is connected to a compression spring 14 which the paper web 23 close to the right-hand corona generator 17 passes. This will make the right paper web surface provided with an electrical charge. This will make the paper contrary to the coating mass ionized by the upper Atomic position of the paper web 23 is oxidized. This corona oxidation leads to hydrophilization and thus to faster water absorption. With sufficient voltage can also be reactive on the cellulose fiber wall Groups are formed that improve the line character.
  • corona generator 17 Above the right-hand corona generator 17 is a left-hand one Corona generator 13 with compression spring provided 19 guide roller 18 provided the oxidation of the left paper web surface causes.
  • the paper web 23 runs through two oppositely driven Film press rollers 20, 12. Horizontal next to these Film press rollers 20, 12 is still another metering roller 11, 21 arranged, which are also counter to the respective Film press roller 12, 20 is driven.
  • the metering roller 11, 21 has a textured surface that uniform wetting of the film press roller 12, 20 with the Spreadable serves.
  • the coating slip is entered and over the surface of the Film press roller 11, 21 on the two paper side surfaces of the continuous paper web 23 applied.
  • the aqueous coating slips provide an electrokinetic System, with each pigment having a zeta potential in it owns aqueous system.
  • the coating slips are dispersed, because these pigments have electrokinetic repulsive forces feature.
  • the invention was therefore based on the knowledge of this electrokinetic Forces in splitting the coating slip film to use and thus improve the transfer to paper 8, 23. Since all common coating colors are anionic and should also be transferred to anionic paper, the electrokinetic repulsive forces had to be overcome for this to achieve a more homogeneous stroke application. Therefore, the method according to the invention is a transfer device, by which the ionogenicity is influenced in such a way that the electrokinetic repulsive forces between the paper 8, 23 and the pigments of the coating slip and thus the coating slip be picked up yourself.
  • the coating slip can both cationic and the paper anionic or vice versa.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)

Claims (8)

  1. Procédé pour améliorer la surface de couchage de la pâte de couchage aqueuse appliquée sur une bande de papier brut (8, 23) à l'aide d'un appareil à enduire le papier, laquelle pâte contient en supplément un dispositif de chargement, qui a une influence sur la bande de papier brut, caractérisé en ce que la bande de papier brut (8, 23) passe à travers deux cylindres de compression de film (1, 3 ; 12, 20), tournant en sens contraire, d'un appareil à enduire le papier, la pâte de couchage aqueuse étant transmise au moyen d'au moins un cylindre de compression de film (1, 3 ; 12, 20) à la bande de papier brut (8, 23), le dispositif de chargement ionisant la pâte de couchage et le papier dans le sens opposé.
  2. Procédé selon la revendication 1, caractérisé en ce que la bande de papier (8) est ionisée à l'aide d'une électrode (7, 7a, 7b), qui est reliée à un pôle d'une source de tension continue (9), l'autre pôle de la source de tension continue (9) étant en liaison avec la pâte de couchage.
  3. Procédé selon la revendication 1, caractérisé en ce que la bande de papier (23) est ionisée au moyen d'au moins une électrode de dispersion (13, 17) (générateur Corona).
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bande de papier brute (8, 23) est couchée avec une vitesse de 800 à 2 000 m/min par la presse de film (1, 23 ; 12, 20).
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la pâte de couchage aqueuse est partiellement déshydratée par les deux cylindres de compression de film (1, 3 ; 12, 20) qui tournent en sens inverse, ce qui fait qu'une couche de la pâte de couchage, mince, prédéfinie et uniforme, est appliquée sur la bande de papier brut (8, 23).
  6. Dispositif pour l'application du procédé selon l'une quelconque des revendications précédentes 1 à 5, caractérisé en ce que, pour l'enduction de la bande de papier brut (8, 23) avec la pâte de couchage aqueuse, il est prévu une presse de film qui contient au moins deux cylindres de compression de film (1, 3 ; 12, 20) et il est prévu un dispositif de chargement électrique pour l'ionisation du papier brut (8, 23).
  7. Dispositif selon la revendication 6, caractérisé en ce que le dispositif de chargement comprend une anode (7, 7a, 7b) et une cathode (5, 5a), qui sont reliées à une source de tension continue (9), une électrode (5, 7, 7a, 7b) étant reliée électriquement respectivement à la bande de papier brut (8) et à la pâte de couchage.
  8. Dispositif selon la revendication 6, caractérisé en ce que le dispositif de chargement contient au moins une électrode de dispersion (générateur Corona) (13, 17), qui est disposée à proximité de la bande de papier (23) et sert à l'ionisation d'au moins une surface de papier.
EP99932773A 1998-07-01 1999-07-01 Procede et dispositif pour ameliorer la surface de couchage de bandes de papier Expired - Lifetime EP1095187B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19829490A DE19829490A1 (de) 1998-07-01 1998-07-01 Verfahren und Vorrichtung zur Verbesserung einer Strichoberfläche von Papierbahnen
DE19829490 1998-07-01
PCT/EP1999/004544 WO2000001887A1 (fr) 1998-07-01 1999-07-01 Procede et dispositif pour ameliorer la surface de couchage de bandes de papier

Publications (2)

Publication Number Publication Date
EP1095187A1 EP1095187A1 (fr) 2001-05-02
EP1095187B1 true EP1095187B1 (fr) 2003-09-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99932773A Expired - Lifetime EP1095187B1 (fr) 1998-07-01 1999-07-01 Procede et dispositif pour ameliorer la surface de couchage de bandes de papier

Country Status (7)

Country Link
US (1) US6521299B1 (fr)
EP (1) EP1095187B1 (fr)
JP (1) JP2002519540A (fr)
AT (1) ATE250164T1 (fr)
DE (2) DE19829490A1 (fr)
ES (1) ES2207250T3 (fr)
WO (1) WO2000001887A1 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE40722E1 (en) * 2002-09-27 2009-06-09 Surmodics, Inc. Method and apparatus for coating of substrates
US7125577B2 (en) * 2002-09-27 2006-10-24 Surmodics, Inc Method and apparatus for coating of substrates
DE10342313A1 (de) * 2003-09-12 2005-04-07 Voith Paper Patent Gmbh Auftragsvorrichtung
WO2008108391A1 (fr) * 2007-03-05 2008-09-12 Nippon Paper Industries Co., Ltd. Papier couché pour l'impression
DE102007036420A1 (de) * 2007-08-02 2009-02-05 Voith Patent Gmbh Vorrichtung zur Herstellung und/oder Behandlung einer Materialbahn
US9364349B2 (en) 2008-04-24 2016-06-14 Surmodics, Inc. Coating application system with shaped mandrel
JP2010236164A (ja) * 2009-03-31 2010-10-21 Nippon Paper Industries Co Ltd グラビア印刷用塗工紙
US9827401B2 (en) 2012-06-01 2017-11-28 Surmodics, Inc. Apparatus and methods for coating medical devices
MX351261B (es) 2012-06-01 2017-10-06 Surmodics Inc Aparato y método para recubrir catéteres con globo.
US11090468B2 (en) 2012-10-25 2021-08-17 Surmodics, Inc. Apparatus and methods for coating medical devices
US9283350B2 (en) 2012-12-07 2016-03-15 Surmodics, Inc. Coating apparatus and methods
WO2020112816A1 (fr) 2018-11-29 2020-06-04 Surmodics, Inc. Appareil et méthodes de revêtement de dispositifs médicaux
US11819590B2 (en) 2019-05-13 2023-11-21 Surmodics, Inc. Apparatus and methods for coating medical devices
US12496612B2 (en) 2021-01-08 2025-12-16 Surmodics, Inc. Coating application system and methods for coating rotatable medical devices

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FR1447984A (fr) * 1964-11-20 1966-08-05 Nat Distillers Chem Corp Procédé pour accroître l'adhérence de revêtements en polyoléfines sur les substrats
US3498865A (en) * 1967-03-27 1970-03-03 Int Paper Co Method of coating paper
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DE2715766B2 (de) * 1977-04-07 1980-01-03 Eichler, Helmut, 7601 Durbach Verfahren und Vorrichtung zur elektrostatischen Unterstützung des Druckvorgangs
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DE3235368A1 (de) * 1982-09-24 1984-03-29 Basf Ag, 6700 Ludwigshafen Verfahren zum streichen von papier und karton
AT383380B (de) * 1985-10-31 1987-06-25 Heinz Mag Bartelmuss Einrichtung zum abfuehren von elektrischen ladungen aus einem vlies aus breiigem material
DE3623738A1 (de) * 1986-07-14 1988-01-21 Ralf Knobel Verfahren und einrichtung zum stellenweisen, vorzugsweise punktuellen beschichten bzw. bedrucken von textilen warenbahnen
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Also Published As

Publication number Publication date
JP2002519540A (ja) 2002-07-02
WO2000001887A1 (fr) 2000-01-13
DE59907029D1 (de) 2003-10-23
EP1095187A1 (fr) 2001-05-02
DE19829490A1 (de) 2000-01-05
ES2207250T3 (es) 2004-05-16
US6521299B1 (en) 2003-02-18
ATE250164T1 (de) 2003-10-15

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