EP0403919B1 - Vorrichtung zum Beseitigen von quer zur Bahnlaufrichtung entstandenen Verdickungen der Beschichtung einer Bahn - Google Patents

Vorrichtung zum Beseitigen von quer zur Bahnlaufrichtung entstandenen Verdickungen der Beschichtung einer Bahn Download PDF

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Publication number
EP0403919B1
EP0403919B1 EP90111034A EP90111034A EP0403919B1 EP 0403919 B1 EP0403919 B1 EP 0403919B1 EP 90111034 A EP90111034 A EP 90111034A EP 90111034 A EP90111034 A EP 90111034A EP 0403919 B1 EP0403919 B1 EP 0403919B1
Authority
EP
European Patent Office
Prior art keywords
web
thickening
layer
coating
over
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
EP90111034A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0403919A3 (de
EP0403919A2 (de
Inventor
Reinhold Nentwich
Reinhard Dipl.-Ing. Krätschmer
Siegfried Rieger
Johann Dipl.-Ing. Baarfüsser
Lothar Langer
Joachim Mittmeyer
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.)
Basf Magnetics basf Magnetics (holding) GmbH GmbH
Original Assignee
BASF Magnetics 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 BASF Magnetics GmbH filed Critical BASF Magnetics GmbH
Publication of EP0403919A2 publication Critical patent/EP0403919A2/de
Publication of EP0403919A3 publication Critical patent/EP0403919A3/de
Application granted granted Critical
Publication of EP0403919B1 publication Critical patent/EP0403919B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a device for eliminating layer thickenings which have arisen transversely to the web running direction after the coating of continuously moving webs with liquids or dispersions.
  • thickening of the layers occurs when the coating devices are attached (immersed) and when the coating devices are removed (immersed) or at adhesive points and web thickenings through an accumulation of layer material. These thickenings usually extend across the entire width of the web transverse to the web running direction.
  • the dipping bead arises from an oversupply of coating solution which, depending on the coating device, for example cascade or extruder, degrades more or less quickly and changes into an equilibrium state of the application mechanism with a constant layer thickness.
  • the immersion bead is formed, which also initially extends as a thickening over the entire web width and then dissolves into "coating tears".
  • the web ends are joined together using adhesive tape.
  • the adhesive tape creates a thickening of the web, which interferes with the application mechanism of the layers, and leads to a thickening and thinning of the layer until equilibrium is restored. Coating defects caused by external influences or partial thickening in the web to be coated also lead to thickening of the layers during coating.
  • thickenings can reach two to four times the normal layer thickness.
  • the web must be completely dry at all locations, including the thickened locations. If the thickened areas are not completely dry, they glue the turns of the wound web to one another, so that unwinding of the web is impossible or the web tears during unwinding.
  • contamination of rollers in contact with the coating occurs, for example during inline calendering of magnetic tape webs, which results in a reduction in quality due to imprints, scratches and deformations.
  • Drying the thickened areas of the web requires a significantly greater drying capacity than the normal layer thickness. This capacity can only be created if the drying section is extended, which leads to high investments, or by reducing the coating speed, which leads to a loss of production and energy. When the layer thickenings are completely dried, there is still the disadvantage of a loss of quality in the normal layer, since this is over-dried and can be cracked, brittle or covered with photographic material.
  • DE-A-30 19 459 describes a corresponding device in which a pair of swiveling air knives directed against the web are arranged on both sides of a deflecting roller, which scrape off the layer thickening and blow into a vacuum trough through which the particles are washed away by means of water.
  • This arrangement has a relatively complicated structure and should cause problems at high throughput speeds.
  • DE-A-28 03 914 describes an arrangement for smoothing the surface of magnetic recording media, in which a grinding device smoothes the magnetic tape and then a nonwoven cleaning device with a rewindable nonwoven cleans the tape. This arrangement is not suitable for removing larger thickenings.
  • the invention is therefore based on the object of finding a device which makes it possible to completely eliminate the thickening of the layers transverse to the web running direction, even at high throughput speeds, without damaging the web and the normal coating of the web.
  • a web (1) provided with a layer (3) runs in the direction of the arrow coming from a casting machine and a subsequent drying device with the back of the web via a first deflecting roller (13) into the cleaning device (12).
  • This consists of a deflection roller (4) over which the web (1) runs with the layer side (3).
  • the layer runs over the roller (4) without soiling it. The traversed path leaves the device in position A.
  • the cleaning roller (2) which is in the rest position in the position 2 'and whose width corresponds to the web width, is pivoted onto the running web so that it moves from the deflection roller (4) is lifted off, so that the web now runs on the layer side exclusively over the preferably rotatable cleaning roller (2).
  • the pressure (surface pressure) that the cleaning roller exerts on the entire width of the web (1) can be regulated depending on the layer composition and can be up to 6 Kp / cm2.
  • the web leaves the device in the working position, that is, now in position B. After the layer thickening has passed, the cleaning roller is pivoted back into position 2 ', so that the web again runs over the deflection roller (4) on the layer side.
  • the cleaning roller contaminated with the liquid or dispersion can often function as described and is only cleaned when the coating system is at a standstill or is provided with a new fleece.
  • the nonwoven in the rest position (position 2 ') can also be cleaned by a device (not specified).
  • the device according to the invention can be switched on and off from the coating point, and the coating device can be used to control and control the device.
  • the immersion time is registered and the device is switched on via a path tracking program when the immersion point has reached the device.
  • a stabilization time for the coating device is added and the device is switched off via the path tracking program when the end of the thickening has passed the device.
  • Thickening of the layers can also be determined by measurements and used to switch the device on and off. For this purpose, either the layer thickness or the moisture of the layer is measured in front of the device. If the measured values exceed a nominal value, the device is moved with a distance of the measuring point from Delay corresponding to the device (path tracking program) switched on and switched off again after a delay after the setpoint was reached again.
  • the device is characterized by a simple and safe function. Damage to the web and its layers is avoided.
  • the device surprisingly succeeds in completely eliminating all of the layer thickening that occurs as a result of the dipping and dipping process, as a result of adhesive points or other web thickening.
  • the device By using the device, it is possible to reduce the drying times for coated webs by 20 to 40%, which, in relation to the web length, can save a considerable amount of energy. This makes it possible to produce more web material at a higher speed with an existing coating system or to dry it more slowly and thus to improve the quality.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP90111034A 1989-06-23 1990-06-12 Vorrichtung zum Beseitigen von quer zur Bahnlaufrichtung entstandenen Verdickungen der Beschichtung einer Bahn Expired - Lifetime EP0403919B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3920575A DE3920575A1 (de) 1989-06-23 1989-06-23 Vorrichtung und verfahren zum beseitigen von quer zur bahnlaufrichtung entstandenen verdickungen der beschichtung
DE3920575 1989-06-23

Publications (3)

Publication Number Publication Date
EP0403919A2 EP0403919A2 (de) 1990-12-27
EP0403919A3 EP0403919A3 (de) 1991-11-27
EP0403919B1 true EP0403919B1 (de) 1993-12-22

Family

ID=6383410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90111034A Expired - Lifetime EP0403919B1 (de) 1989-06-23 1990-06-12 Vorrichtung zum Beseitigen von quer zur Bahnlaufrichtung entstandenen Verdickungen der Beschichtung einer Bahn

Country Status (5)

Country Link
US (1) US5040481A (xx)
EP (1) EP0403919B1 (xx)
JP (1) JPH0330865A (xx)
DE (2) DE3920575A1 (xx)
TR (1) TR26375A (xx)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537779A1 (de) * 1995-10-11 1997-04-17 Leybold Ag Beschichtungsanlage für Folien
DE19537781A1 (de) * 1995-10-11 1997-04-17 Leybold Ag Beschichtungsanlage für Folien

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US465462A (en) * 1891-12-22 glaus
DE140349C (xx) *
US2642030A (en) * 1949-07-28 1953-06-16 Masonite Corp Roller coating machine for rigid sheet material
US3192893A (en) * 1962-08-16 1965-07-06 American Can Co Apparatus for producing highly glossy protective sheets
US3908588A (en) * 1972-09-11 1975-09-30 Masonite Corp Apparatus for making decorative panels
GB1476559A (en) * 1974-05-28 1977-06-16 Hoechst Ag Apparatus for developing electrophotographic materials
US4137866A (en) * 1976-04-09 1979-02-06 Heanley Charles P Apparatus for preparation of blood samples
US4111155A (en) * 1977-09-12 1978-09-05 P. R. Mallory & Co., Inc. Cathode coating apparatus
DE2803914A1 (de) * 1978-01-30 1979-08-02 Basf Ag Verfahren und anordnung zum glaetten der oberflaeche von schichtaufzeichnungstraegern
US4765270A (en) * 1987-09-16 1988-08-23 Deco Tools, Inc. Decorative coating machine

Also Published As

Publication number Publication date
JPH0330865A (ja) 1991-02-08
EP0403919A3 (de) 1991-11-27
DE59003938D1 (de) 1994-02-03
EP0403919A2 (de) 1990-12-27
DE3920575A1 (de) 1991-01-03
TR26375A (tr) 1995-03-15
US5040481A (en) 1991-08-20

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