EP0658651A1 - Rakel zum Beschichten von Bahnen aus Papier oder Karton - Google Patents

Rakel zum Beschichten von Bahnen aus Papier oder Karton Download PDF

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Publication number
EP0658651A1
EP0658651A1 EP94117721A EP94117721A EP0658651A1 EP 0658651 A1 EP0658651 A1 EP 0658651A1 EP 94117721 A EP94117721 A EP 94117721A EP 94117721 A EP94117721 A EP 94117721A EP 0658651 A1 EP0658651 A1 EP 0658651A1
Authority
EP
European Patent Office
Prior art keywords
lamellae
doctor blade
blade according
coated
curvature
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.)
Withdrawn
Application number
EP94117721A
Other languages
German (de)
English (en)
French (fr)
Inventor
Friedhelm Ruhl
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.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
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 JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0658651A1 publication Critical patent/EP0658651A1/de
Withdrawn legal-status Critical Current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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material

Definitions

  • the invention relates to a doctor blade according to the preamble of claim 1.
  • a doctor blade is known from DE 38 39 564. With this doctor blade, individual lamellae of different diameters are alternately fastened next to one another on a carrier rod. This construction gives a doctor rod which corresponds essentially to known doctor rods with circumferential grooves. The application takes place with a drive which drives the doctor rod in the opposite direction or in the same direction to the web running direction or running direction of the surface to be coated.
  • doctor blades are of course subject to considerable wear, so that the larger diameter fins are made from a harder material.
  • doctor blades in the form of coating blades (leaf springs) which can be adjusted by means of adjusting means in their contact pressure and the angle of attack against the web or the surface to be coated.
  • the object of the invention is to form a doctor blade that is variable in terms of setting, which can be exchanged relatively easily and which is also relatively inexpensive.
  • doctor rod constructed according to the invention Due to the doctor rod constructed according to the invention, the usual volumetric metering option is the same as for grooved ones Doctor rod still given. Another great advantage is that you can change the configuration during operation and thus vary the dosage, for example. Worn doctor blades can be replaced simply by changing the doctor blades.
  • FIG. 1 showing a cross section
  • FIG. 2 a partial view of the doctor carrier.
  • a squeegee holder 4 holds a carrier 2, which is essentially a long plate, the length being formed in the usual way according to the width of the paper web. It has individual slots 8, in which slats 1 are guided, which are relatively thin and easily deformable, which is done here by a pressure hose 6. This presses on the individual lamellae via a pressure piece 7, whereby it acts essentially centrally on the latter.
  • the slats 1 are convexly curved, protrude from the slots 8 in their central region and rest on the web W.
  • the surface of the carrier 2 facing the web W can also have a slight curvature, at least in the region where the lamellae 1 protrude from the slots 8.
  • the radius of curvature of the lamellas in operation namely their surface facing the web W, can be between a minimum of 12, generally 25 and 200 mm, in order to meet practical requirements.
  • the curvature of the carrier 2 on this side can be between 100 and 400 mm, the curvature meaning the radius R1 or R2.
  • the surface of the carrier 2 facing the web W can of course be be even in the area of the slats.
  • the pressure piece has a projection 9, by means of which it engages in a groove 5 of the doctor blades 1.
  • the slats can be made of highly wear-resistant material, e.g. made from a carbide or an oxide.
  • 2 shows the grooves or metering channels 12 formed between the lamellae 1, which are used for volumetric metering of the coating slip.
  • the groove thickness (of the spaces or metering channels 12) is approximately between 0.1 and 0.6 mm in terms of width and between 0.1 and 0.3 mm in terms of maximum height. However, these values can also be exceeded considerably - e.g. up to more than 1 mm wide - or even slightly less - e.g. up to 0.05 mm -. These values are to be measured according to practical requirements.
  • a pressure chamber could also be provided behind the slats 1 and the support 2.
  • the lamellae can be formed from thin sheet metal.
  • the fins can be straight and are deformed by the pressure hose 6 or by the internal pressure in the holder 4.

Landscapes

  • Coating Apparatus (AREA)
EP94117721A 1993-11-29 1994-11-10 Rakel zum Beschichten von Bahnen aus Papier oder Karton Withdrawn EP0658651A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4340578 1993-11-29
DE19934340578 DE4340578C2 (de) 1993-11-29 1993-11-29 Rakel zum Beschichten von Bahnen aus Papier oder Karton

Publications (1)

Publication Number Publication Date
EP0658651A1 true EP0658651A1 (de) 1995-06-21

Family

ID=6503680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94117721A Withdrawn EP0658651A1 (de) 1993-11-29 1994-11-10 Rakel zum Beschichten von Bahnen aus Papier oder Karton

Country Status (5)

Country Link
EP (1) EP0658651A1 (sv)
JP (1) JPH07195021A (sv)
CA (1) CA2136806A1 (sv)
DE (1) DE4340578C2 (sv)
FI (1) FI945577A (sv)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4402226C2 (de) * 1994-01-27 1997-11-06 Voith Gmbh J M Rakelvorrichtung
DE29621876U1 (de) * 1996-12-17 1997-02-13 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Rakelvorrichtung
DE19711728A1 (de) * 1997-03-20 1998-09-24 Voith Sulzer Papiermasch Gmbh Einrichtung zum Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn, insbesondere aus Papier oder Karton
US6192597B1 (en) 1997-04-17 2001-02-27 Voith Sulzer Papiermaschinen Gmbh Device for treating a fibrous pulp web as well as a sealing device for a device of this kind
DE19729663A1 (de) * 1997-07-11 1999-01-14 Voith Sulzer Papiermasch Gmbh Rakelvorrichtung
DE19817202A1 (de) * 1998-04-17 1999-10-21 Voith Sulzer Papiertech Patent Dichtungseinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB697512A (en) * 1950-11-09 1953-09-23 Asea Ab Apparatus for coating smooth surfaces with liquids
DE3438643A1 (de) * 1983-10-22 1985-05-02 Konishiroku Photo Industry Co., Ltd., Tokio/Tokyo Verfahren zum glaetten einer beschichtung und vorrichtung zum durchfuehren dieses verfahrens
DE3931793A1 (de) * 1988-09-27 1990-03-29 Btg Kaelle Inventing Ab Ein geraet zur beschichtung einer fahrenden bahn
DE3839564A1 (de) * 1988-11-24 1990-05-31 Jagenberg Ag Rakelwelle zum volumetrischen dosieren von beschichtungsmaterial

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8232839U1 (de) * 1982-11-23 1984-06-14 Jagenberg AG, 4000 Düsseldorf Vorrichtung zum beschichten laufender materialbahnen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB697512A (en) * 1950-11-09 1953-09-23 Asea Ab Apparatus for coating smooth surfaces with liquids
DE3438643A1 (de) * 1983-10-22 1985-05-02 Konishiroku Photo Industry Co., Ltd., Tokio/Tokyo Verfahren zum glaetten einer beschichtung und vorrichtung zum durchfuehren dieses verfahrens
DE3931793A1 (de) * 1988-09-27 1990-03-29 Btg Kaelle Inventing Ab Ein geraet zur beschichtung einer fahrenden bahn
DE3839564A1 (de) * 1988-11-24 1990-05-31 Jagenberg Ag Rakelwelle zum volumetrischen dosieren von beschichtungsmaterial

Also Published As

Publication number Publication date
CA2136806A1 (en) 1995-05-30
JPH07195021A (ja) 1995-08-01
FI945577A0 (sv) 1994-11-28
DE4340578C2 (de) 1995-03-30
FI945577A (sv) 1995-05-30
DE4340578A1 (de) 1994-05-26

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