EP0438743B1 - Coating process and apparatus for coating a moving web of paper or paperboard - Google Patents
Coating process and apparatus for coating a moving web of paper or paperboard Download PDFInfo
- Publication number
- EP0438743B1 EP0438743B1 EP90124884A EP90124884A EP0438743B1 EP 0438743 B1 EP0438743 B1 EP 0438743B1 EP 90124884 A EP90124884 A EP 90124884A EP 90124884 A EP90124884 A EP 90124884A EP 0438743 B1 EP0438743 B1 EP 0438743B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- roller
- layer
- application
- process according
- 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.)
- Revoked
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 42
- 239000011248 coating agent Substances 0.000 title claims abstract description 36
- 239000011087 paperboard Substances 0.000 title abstract 2
- 239000000123 paper Substances 0.000 title description 5
- 239000007787 solid Substances 0.000 claims abstract description 14
- 239000011111 cardboard Substances 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract 4
- 239000000049 pigment Substances 0.000 claims abstract 2
- 238000000034 method Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims 6
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000009499 grossing Methods 0.000 description 4
- 239000005995 Aluminium silicate Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229940086721 perfect coat Drugs 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Classifications
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- 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
- D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
-
- 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
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
- B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
-
- 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
- B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
- B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
-
- 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
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
-
- 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
Definitions
- the invention relates to a coating method according to the preamble of claim 1 and corresponding application devices.
- a method for coating running material webs with two successive coating processes, the layer applied first being still moist when the second layer is applied, is known from US Pat. No. 3,202,536.
- the two coating stations are arranged here on a single roller guiding the web as well as on two successive rollers.
- a so-called air brush is used as the final smoothing element.
- a corresponding application device with a roller guiding the web on a coating device is also known from CA-PS 882 640.
- the layer is applied by an application roller and scraped off by a doctor blade. It is envisaged that a mixture for the coating mass of kaolin-containing mass as well as mass consisting of starch, protein or thermoplastic synthetic resin is used.
- the first application layer has a relatively high consistency, i.e. with a solids content of more than 55% and the second layer has a much lower consistency with a lower solids content of at most 45%, the main proportion being kaolin.
- the first layer is applied very thickly, so that it can first be smoothed using a doctor blade.
- the object of the invention is to provide a device and a method with which a perfect coat application can also be achieved even at high solids contents, which are common today also in mass products. This applies in particular to the use in cardboard, where the roughness of the surface of the raw cardboard is relatively large, so that with other coating processes, e.g. use a doctor blade as a leveling element, uncovered areas can appear on the protruding "mountains".
- the application mass is imprinted on the web from the surface of the first web guide roller, and there is certainly a brief deformation of the paper web.
- the amount applied or transferred is relatively small, in such a way that solid particles of the coating slip remain on the "mountains" of micro-roughness.
- the pressing pressure and the hydraulic pressure in the press nip result in a certain dewatering of the coating slip of the first layer, but a moisture content of the coating slip remains.
- the "pre-dewatering" in the press nip ensures that the coating compound adheres to the "mountains" of the web everywhere. A certain intermediate drying before the second layer application is possible.
- the second application layer is only metered by means of the grooves of a roller doctor provided with circumferential grooves, without acting on the layer with a further smoothing element.
- a bleeding is achieved to a sufficient extent so that further smoothing, combined with possible disadvantages of scraping, is unnecessary.
- the web is passed through a press nip formed between two rollers 1 and 2.
- the one roller which is provided with a rubberized surface, is assigned an application unit which has a nozzle chamber 6 and, at its outlet end, a roller doctor blade 7 provided with circumferential grooves and a holder 8 for the same.
- the hardness of the rubber coating of the roller 1 can be between 0 and 200, preferably 10 and 70 P and J.
- the application quantity for the case of cardboard is 6 to 40 ml / m2, preferably 12 to 22 ml / m2.
- the second layer is applied in a comparable arrangement with a doctor blade 11 and its holder 12 and nozzle chamber 9, but a leveling blade or a smooth doctor blade at point 10 can also be used as a leveling element.
- the consistencies in question are between 50 and 70%, preferably 50 and 60% maximum for the first application layer and between 60 and 70% maximum for the second application layer. It is to be regarded as favorable if a nozzle chamber 6, 9 is provided as the application unit, at the outlet end of which a roller doctor blade 7, 11 with its holder is located in the vicinity of the surface to be coated 8, 12 is arranged. So you have the advantage over the air brush method that you can work with a relatively high consistency overall, but especially with the second application layer.
- the line pressures in the press nip between the first two rolls 1 and 2 are between 5 and 60 kN / m, preferably 20 to 40 kN / m.
- the arrangement according to FIG. 2 has only a total of two web guide rollers 21 and 22, each being assigned an application device of the type described. This arrangement is possible in the case of cardboard because it expands less than paper due to the moistening in the coating unit.
- FIG. 4 also shows that a transfer roller 17 for the coating slip can also be used for the second coating device. It is then to be doctored by one of the known metering elements.
- the first application layer can be dosed with a doctor blade instead of with the grooves of a roller squeegee, but here the work of the doctor blade must be monitored very closely.
Landscapes
- Paper (AREA)
- Coating Apparatus (AREA)
- Fats And Perfumes (AREA)
- Saccharide Compounds (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein Beschichtungsverfahren entsprechend dem Oberbegriff des Patentanspruchs 1 sowie entsprechende Auftragseinrichtungen.The invention relates to a coating method according to the preamble of claim 1 and corresponding application devices.
Ein Verfahren zur Beschichtung laufender Warenbahnen mit zwei aufeinanderfolgenden Beschichtungsvorgängen, wobei die zuerst aufgetragene Schicht noch feucht ist, wenn die zweite Schicht aufgetragen wird, ist bekannt aus US-A- 3,202,536. Die beiden Beschichtungsstationen sind hier sowohl an einer einzigen, die Bahn führenden Walze angeordnet als auch an zwei aufeinanderfolgenden Walzen. Als abschließendes Glättungselement wird eine sogenannte Luftbürste verwendet. Eine Auftragseinrichtung entsprechender Art mit jeweils die Bahn an einer Beschichtungseinrichtung führenden Walze ist auch bekannt aus CA-PS 882 640. In diesem Fall wird die Schicht jeweils durch eine Auftragswalze aufgetragen und durch eine Streichklinge abgeschabt. Es ist vorgesehen, daß eine Mischung für die Beschichtungsmasse aus kaolinhaltiger Masse sowie aus Stärke, Protein oder thermoplastischem Kunstharz bestehender Masse benutzt wird.A method for coating running material webs with two successive coating processes, the layer applied first being still moist when the second layer is applied, is known from US Pat. No. 3,202,536. The two coating stations are arranged here on a single roller guiding the web as well as on two successive rollers. A so-called air brush is used as the final smoothing element. A corresponding application device with a roller guiding the web on a coating device is also known from CA-PS 882 640. In this case the layer is applied by an application roller and scraped off by a doctor blade. It is envisaged that a mixture for the coating mass of kaolin-containing mass as well as mass consisting of starch, protein or thermoplastic synthetic resin is used.
In der nicht vorveröffentlichten EP-A 352582 ist eine Streicheinrichtung beschrieben, bei welcher zwei Schichten nass in nass aufeinanderfolgend aufgetragen werden, wobei die erste Schicht in einem zwischen zwei Preßwalzen gebildeten Preßspalt in die Bahn eingepreßt wird, so daß eine Imprägnierung erzielt wird. Dabei soll der Flüssigkeitsanteil nur dem Aufnahmevermögen (Aufsaugkapazität) der Bahn entsprechen. Diese Einrichtung ist hauptsächlich für Papier und nicht für Karton gedacht bzw. verwendbar.In the unpublished EP-A 352582 a coating device is described in which two layers are applied successively wet-on-wet, the first layer being pressed into the web in a press nip formed between two press rolls, so that impregnation is achieved. The liquid content should only correspond to the absorption capacity (suction capacity) of the web. This device is mainly intended for paper and not for cardboard.
Im Falle der US-A- 3,202,536 ist vorgesehen, daß die erste Auftragsschicht eine relativ hohe Konsistenz, d.h. mit einem Feststoffgehalt von mehr als 55 % und die zweite Schicht eine wesentlich niedrigere Konsistenz mit einem niedrigeren Feststoffgehalt von höchstens 45 % aufweist, wobei der Hauptanteil jeweils Kaolin ist.In the case of US-A-3,202,536 it is provided that the first application layer has a relatively high consistency, i.e. with a solids content of more than 55% and the second layer has a much lower consistency with a lower solids content of at most 45%, the main proportion being kaolin.
Entscheidend ist jedoch dabei, daß die erste Schicht sehr dick aufgetragen wird, so daß sie zunächst mittels Streichklinge geglättet werden kann.It is crucial, however, that the first layer is applied very thickly, so that it can first be smoothed using a doctor blade.
Die Anwendung einer Luftbürste ist heute jedoch wegen der großen Bahngeschwindigkeiten beim Auftragen sehr problematisch, praktisch kann die Luftbürste nur bis zu Geschwindigkeiten von 500 m/min. benutzt werden. Dies ist bei dem heutigen Konkurrenzdruck ein ganz schwerer Nachteil, obwohl die Luftbürste den großen Vorteil hat, daß mit ihr trotz relativ sparsamem Auftrag ein einwandfreier Strichauftrag erzielt werden kann.However, the use of an air brush is very problematic today because of the high web speeds when applying it. In practice, the air brush can only operate at speeds of up to 500 m / min. to be used. With today's competitive pressure, this is a very serious disadvantage, although the air brush has the great advantage that it can be used to achieve a perfect stroke despite the relatively economical application.
Die Aufgabe der Erfindung ist es, eine Einrichtung sowie ein Verfahren anzugeben, mit welchem ebenfalls ein einwandfreier Strichauftrag auch bei hohen Feststoffgehalten, die heute allgemein auch bei Massenprodukten gängig sind, erzielbar ist. Dies gilt insbesondere für die Anwendung bei Karton, wo ja die Rauhigkeit der Oberfläche des Rohkartons relativ groß ist, so daß bei anderen Streichverfahren, die z.B. eine Streichklinge als Egalisierelement benutzen, es an den hervorstehenden "Bergen" zu unbedeckten Stellen kommen kann.The object of the invention is to provide a device and a method with which a perfect coat application can also be achieved even at high solids contents, which are common today also in mass products. This applies in particular to the use in cardboard, where the roughness of the surface of the raw cardboard is relatively large, so that with other coating processes, e.g. use a doctor blade as a leveling element, uncovered areas can appear on the protruding "mountains".
Erfindungsgemäß wird praktisch beim ersten Schichtauftrag mittels des Preßdruckes in dem zwischen den beiden zusammenwirkenden Walzen gebildeten Preßspalt die Auftragsmasse von der Oberfläche der ersten Bahnführungswalze auf die Warenbahn abgedruckt, wobei es sicher zu einer kurzzeitigen Verformung der Papierbahn kommt. Die aufgetragene bzw. übertragene Menge ist dabei relativ gering, und zwar derart, daß ein Verbleiben von Feststoffpartikeln der Streichmasse auch auf den "Bergen" der Mikrorauhigkeit gewährleistet ist. Durch den Preßdruck und den hydraulischen Druck in dem Preßspalt erfolgt eine gewisse Entwässerung der Streichmasse der ersten Schicht, es bleibt aber ein Feuchtigkeitsgehalt der Streichmasse erhalten. Durch die "Vorentwässerung" im Preßspalt wird ein Anhaften der Streichmasse auch an den "Bergen" der Bahn überall sichergestellt. Eine gewisse Zwischentrocknung vor dem zweiten Schichtauftrag ist möglich.According to the invention, in the first layer application, by means of the pressure in the press nip formed between the two interacting rollers, the application mass is imprinted on the web from the surface of the first web guide roller, and there is certainly a brief deformation of the paper web. The amount applied or transferred is relatively small, in such a way that solid particles of the coating slip remain on the "mountains" of micro-roughness. The pressing pressure and the hydraulic pressure in the press nip result in a certain dewatering of the coating slip of the first layer, but a moisture content of the coating slip remains. The "pre-dewatering" in the press nip ensures that the coating compound adheres to the "mountains" of the web everywhere. A certain intermediate drying before the second layer application is possible.
Für die Beschichtung von Karton hat es sich als günstig herausgestellt, wenn die zweite Auftragsschicht mittels der Rillen einer mit Umfangsrillen versehenen Rollrakel nur dosiert wird, ohne daß auf die Schicht mit einem weiteren Glättungselement eingewirkt wird. Bei einer entsprechenden Einstellung der Konsistenz der Streichmasse wird ein Verlaufen in ausreichendem Maße erreicht, so daß ein weiteres Glätten, verbunden mit eventuellen Nachteilen des Abschabens überflüssig ist.For the coating of cardboard, it has proven to be advantageous if the second application layer is only metered by means of the grooves of a roller doctor provided with circumferential grooves, without acting on the layer with a further smoothing element. With a corresponding adjustment of the consistency of the coating slip, a bleeding is achieved to a sufficient extent so that further smoothing, combined with possible disadvantages of scraping, is unnecessary.
Nachfolgend wird die Erfindung anhand der in den Figuren der Zeichnung dargestellten Ausführungsbeispiele erläutert, die jeweils prinzipmäßig das Auftragsverfahren darstellen.The invention is explained below on the basis of the exemplary embodiments illustrated in the figures of the drawing, each of which in principle represents the application method.
In Figur 1 ist vorgesehen, daß die Warenbahn durch einen zwischen zwei Walzen 1 und 2 gebildeten Preßspalt geführt wird. Dabei ist der einen Walze, die mit einer gummierten Oberfläche versehen ist, ein Auftragswerk zugeordnet, das eine Düsenkammer 6 und an ihrem austrittsseitigen Ende eine mit Umfangsrillen versehene Rollrakel 7 und einen Halter 8 für dieselbe aufweist. Die Härte des Gummiüberzugs der Walze 1 kann zwischen 0 und 200, vorzugsweise 10 und 70 P u.J, betragen. Die Auftragsmenge für den Fall von Karton ist mit 6 bis 40 ml/m², vorzugsweise 12 bis 22 ml/m², zu bemessen. Die zweite Schicht wird in einer vergleichbaren Anordnung mit Rollrakel 11 und deren Halter 12 sowie Düsenkammer 9 aufgetragen, wobei jedoch als Egalisierelement auch eine Streichklinge oder eine glatte Rollrakel an der Stelle 10 in Frage kommt.In Figure 1 it is provided that the web is passed through a press nip formed between two
Die in Frage kommenden Konsistenzen, d.h. Feststoffgehalte, liegen für die erste Auftragsschicht zwischen 50 und 70 %, vorzugsweise 50 und 60 % maximal und für die zweite Auftragsschicht zwischen 60 und 70 % maximal. Es ist als günstig anzusehen, wenn als Auftragswerk jeweils eine Düsenkammer 6, 9 vorgesehen ist, an deren austrittsseitigem Ende in der Nähe der zu beschichtenden Oberfläche eine Rollrakel 7, 11 mit deren Halter 8, 12 angeordnet ist. Man hat also hier den Vorteil gegenüber dem Luftbürstenverfahren, daß man mit relativ hoher Konsistenz insgesamt, insbesondere aber bei der zweiten Auftragsschicht arbeiten kann. Die Liniendrücke im Preßspalt zwischen den beiden ersten Walzen 1 und 2 betragen zwischen 5 und 60 kN/m, vorzugsweise 20 bis 40 kN/m.The consistencies in question, ie solids contents, are between 50 and 70%, preferably 50 and 60% maximum for the first application layer and between 60 and 70% maximum for the second application layer. It is to be regarded as favorable if a nozzle chamber 6, 9 is provided as the application unit, at the outlet end of which a
Die Anordnung nach Figur 2 hat nur insgesamt zwei Bahnführungswalzen 21 und 22, wobei jeder eine Auftragseinrichtung der beschriebenen Art zugeordnet ist. Diese Anordnung ist im Falle von Karton möglich, weil dieser sich durch die Befeuchtung im Streichwerk weniger dehnt als Papier.The arrangement according to FIG. 2 has only a total of two
Bei Karton ist eine günstige Möglichkeit, als Dosierelement eine mit Umfangsrillen versehene Rollrakel 11 mit Halter 12 am auslaufenden Ende der Düsenkammer 9 für die zweite Beschichtung (Enddosierung) vorzusehen und danach kein weiteres Glättelement anzuwenden. Dies ist in Figur 3 dargestellt. Damit kann ein sehr guter Strichauftrag bei relativ sparsamem Einsatz von Streichmasse erreicht werden.In the case of cardboard, an inexpensive possibility is to provide a
In Figur 4 ist noch dargestellt, daß für die zweite Beschichtungseinrichtung auch eine Übertragungswalze 17 für die Streichmasse Verwendung finden kann. Es ist danach ein Abrakeln durch eines der bekannten Dosierelemente vorzusehen.FIG. 4 also shows that a
Man kann in einem bestimmten Anwendungsbereich, im Fall von Leimauftrag für Papier, die erste Auftragsschicht statt mit den Rillen einer Rollrakel auch mit einer Streichklinge dosieren, muß hier aber sehr genau das Arbeiten der Streichklinge überwachen.In a certain area of application, in the case of glue application for paper, the first application layer can be dosed with a doctor blade instead of with the grooves of a roller squeegee, but here the work of the doctor blade must be monitored very closely.
Claims (9)
- Process for coating linear webs of material, wherein two layers are placed directly one after the other on top of each other whilst the first layer is still wet, and therein for both the first and the second coating process is provided at least one rotating roller to guide the length of material, and wherein at least the second layer is applied directly to the length and apportioned, wherein in the first coating process the application layer is apportionately applied, by means of a spreading blaoe or a suitable ledge or a doctor knife which is provided with fine peripheral grooves or helical ridges of close proximity, to the coating surface of the first roller (1) which guides the lengtn of material in such small quantity, that in a downstream pressure gap, which has been established between a counter-roller (2) and the first roller (1), the spreading substance is imprinted on the length of material which is guided through the pressure gap in such a manner that overall at least a thin layer of coating substance remains, in particular with regard to the proportion of solids or pigments, and that the solids content of the coating substance for the first application layer is maximum 70̸%, and the solids proportion of the second coating substance is between 60̸ and 70̸%.
- Process according to claim 1, characterised in that the solids content of the coating substance for the first application layer is between 50̸ and 60̸%.
- Process according to claim 1 or 2, characterised in that the application quantity for coating cardboard is between 6 and 40̸ ml/m² for the first application layer, in particular between 12 and 22 ml/m².
- Process according to one of claims 1 to 3, characterised in that the second coating is apportioned on the second guide roller by a doctor knife with peripheral grooves, whereafter the length of material is diverted by the second guide roller (3), and that the solios proportion of the second coating substance is maximum 70̸%.
- Process according to one of claims 1 to 4, characterised in that the solids content of the second application layer is at least 10̸% absolute above that of the first application layer.
- Process according to one of claims 1 to 5, characterised by its use in the manufacture of coated cardboard.
- Device for carrying out the process according to one of claims 1 to 6, characterised in that a respective nozzle chamber (6, 9) is provided to serve as an application mechanism, having at its outlet near the surface to be coated a doctor knife (7, 11) with its holder (8, 12).
- Device according to claim 8, characterised in that at least the first guide roller (1) is coated with a layer of rubber or similar material of a hardness between 0̸ and 20̸0̸ P u.J. preferably between 10̸ and 70̸ P u.J.
- Device according to claim 8 or 9, characterised in that the second application mechanism for application of the second layer is positioned on the second guide roller (pressure roller 22) which is associated with the first guide roller (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT90124884T ATE95585T1 (en) | 1990-01-26 | 1990-12-20 | COATING PROCESS AND APPLICATION EQUIPMENT FOR COATING RUNNING WEBS OF PAPER OR CARDBOARD. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4002256 | 1990-01-26 | ||
| DE4002256A DE4002256A1 (en) | 1990-01-26 | 1990-01-26 | Cardboard web coating - has grooved roller spreader and web guide roller to give thin in layer of coating mass |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0438743A1 EP0438743A1 (en) | 1991-07-31 |
| EP0438743B1 true EP0438743B1 (en) | 1993-10-06 |
Family
ID=6398818
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90124884A Revoked EP0438743B1 (en) | 1990-01-26 | 1990-12-20 | Coating process and apparatus for coating a moving web of paper or paperboard |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0438743B1 (en) |
| JP (1) | JPH04313360A (en) |
| AT (1) | ATE95585T1 (en) |
| BR (1) | BR9006678A (en) |
| CA (1) | CA2035061A1 (en) |
| DE (2) | DE4002256A1 (en) |
| ES (1) | ES2044390T3 (en) |
| FI (1) | FI905757A (en) |
| NO (1) | NO176676C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL422374A1 (en) * | 2017-07-27 | 2019-01-28 | Kartonex Spółka Z Ograniczoną Odpowiedzialnością | Method for impregnation of corrugated board and the set of devices for impregnation of corrugated board |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4211401A1 (en) * | 1992-04-04 | 1993-10-07 | Voith Gmbh J M | Coating device for webs of paper or cardboard |
| FI93885C (en) * | 1992-05-21 | 1995-06-12 | Valmet Paper Machinery Inc | Coating device for coating a roll of glue press, paper or board |
| DE4224717B9 (en) * | 1992-07-27 | 2004-08-19 | Mitsubishi Hitec Paper Bielefeld Gmbh | Process for producing a pressure sensitive recording sheet |
| FI93665C (en) * | 1992-11-13 | 1995-05-10 | Valmet Paper Machinery Inc | Method and apparatus for coating a paper web |
| FI95946C (en) * | 1993-04-06 | 1996-04-10 | Veitsiluoto Oy | The apparatus and method for coating paper |
| DE4414949A1 (en) * | 1994-04-28 | 1995-11-02 | Voith Gmbh J M | Device for applying at least one liquid medium to a running web of material |
| DE19508178A1 (en) * | 1995-03-09 | 1996-09-12 | Draiswerke Gmbh | Process and plant for treating coating color when applied to a paper web |
| DE19606459A1 (en) * | 1996-02-21 | 1997-08-28 | Voith Sulzer Papiermasch Gmbh | Methods and devices for applying a liquid or pasty medium to a running web of material |
| DE19623622A1 (en) * | 1996-06-13 | 1997-12-18 | Voith Sulzer Papiermasch Gmbh | Method and device for coating a running material web |
| DE29610395U1 (en) * | 1996-06-13 | 1996-08-22 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Device for the sequential application of two layers of liquid or pasty media on one side of a running material web |
| FI110274B (en) * | 1996-11-04 | 2002-12-31 | Metso Paper Inc | Method and apparatus for coating a moving cardboard web |
| DE19827030A1 (en) * | 1998-06-17 | 1999-12-23 | Voith Sulzer Papiertech Patent | Application device |
| DE19958109A1 (en) * | 1999-12-02 | 2001-06-07 | Voith Paper Patent Gmbh | Assembly for the indirect coating of a moving paper/cardboard web has structured peripheral positions and peripheral angles around the transfer roller for an effective and consistent surface coating action |
| DE10126365A1 (en) * | 2001-05-30 | 2002-12-05 | Voith Paper Patent Gmbh | To coat a moving paper/cardboard web on both sides, a coating is applied indirectly to one side to give a shallow penetration depth, and coated indirectly on the other side with a greater penetration depth |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352582A2 (en) * | 1988-07-27 | 1990-01-31 | J.M. Voith GmbH | Application device for coating moving webs, and coating process |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2870738A (en) * | 1957-02-28 | 1959-01-27 | Black Clawson Co | Paper coating machine |
| US3202536A (en) * | 1961-11-08 | 1965-08-24 | Beloit Corp | Method and apparatus for coating paper |
-
1990
- 1990-01-26 DE DE4002256A patent/DE4002256A1/en not_active Withdrawn
- 1990-11-06 NO NO904827A patent/NO176676C/en unknown
- 1990-11-21 FI FI905757A patent/FI905757A/en not_active IP Right Cessation
- 1990-12-20 DE DE90124884T patent/DE59003011D1/en not_active Revoked
- 1990-12-20 ES ES90124884T patent/ES2044390T3/en not_active Expired - Lifetime
- 1990-12-20 AT AT90124884T patent/ATE95585T1/en active
- 1990-12-20 EP EP90124884A patent/EP0438743B1/en not_active Revoked
- 1990-12-21 BR BR909006678A patent/BR9006678A/en not_active Application Discontinuation
-
1991
- 1991-01-17 JP JP3017055A patent/JPH04313360A/en active Pending
- 1991-01-28 CA CA002035061A patent/CA2035061A1/en not_active Abandoned
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352582A2 (en) * | 1988-07-27 | 1990-01-31 | J.M. Voith GmbH | Application device for coating moving webs, and coating process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL422374A1 (en) * | 2017-07-27 | 2019-01-28 | Kartonex Spółka Z Ograniczoną Odpowiedzialnością | Method for impregnation of corrugated board and the set of devices for impregnation of corrugated board |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04313360A (en) | 1992-11-05 |
| NO904827D0 (en) | 1990-11-06 |
| BR9006678A (en) | 1991-10-01 |
| FI905757A (en) | 1991-07-27 |
| DE4002256A1 (en) | 1991-08-01 |
| ES2044390T3 (en) | 1994-01-01 |
| NO176676C (en) | 1995-05-10 |
| NO176676B (en) | 1995-01-30 |
| NO904827L (en) | 1991-07-29 |
| EP0438743A1 (en) | 1991-07-31 |
| FI905757A0 (en) | 1990-11-21 |
| ATE95585T1 (en) | 1993-10-15 |
| CA2035061A1 (en) | 1991-07-27 |
| DE59003011D1 (en) | 1993-11-11 |
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