WO2001091917A1 - Verfahren und vorrichtung zur vorhangbeschichtung - Google Patents
Verfahren und vorrichtung zur vorhangbeschichtung Download PDFInfo
- Publication number
- WO2001091917A1 WO2001091917A1 PCT/EP2001/005639 EP0105639W WO0191917A1 WO 2001091917 A1 WO2001091917 A1 WO 2001091917A1 EP 0105639 W EP0105639 W EP 0105639W WO 0191917 A1 WO0191917 A1 WO 0191917A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- carrier material
- brushes
- web
- rows
- bristle
- Prior art date
Links
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
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/005—Curtain coaters
Definitions
- the present invention relates to a method and a device for curtain coating used therefor, in which a free-falling liquid curtain is applied from at least one layer to a continuously moving web-shaped carrier material.
- curtain coating processes are becoming increasingly important due to their numerous advantages, which include not only the ability to apply several layers of different coating liquids at the same time, but also appealing surface properties of the applied coatings.
- the curtain coating processes are frequently used for the production of photographic paper and magnetic recording papers, but there are also increasing reports of other possible fields of application of the curtain coating processes, for example for the production of heat and pressure-sensitive recording materials, ink jet receiving media and pigment-coated recording materials.
- the so-called slot casters in which the coating liquid exits through a downward outlet gap arranged transversely across the web-shaped carrier material to be coated and forms the free-falling liquid curtain there directly
- the so-called sliding surface caster in which the coating liquid exits through a downward outlet gap arranged transversely across the web-shaped carrier material to be coated and forms the free-falling liquid curtain there directly
- the so-called sliding surface caster In this, the coating liquid is first applied to a downwardly sloping sliding surface, where the liquid flows down the sliding surface in a thin film under the influence of gravity and forms the free-falling liquid curtain at its end.
- the material web to be coated by means of the curtain coating method is directed slightly downwards between two guide rollers located in front of and behind the wetting line by a knife arranged some distance in front of the wetting line.
- the knife forms an airtight shield for the air entrained from the material web to the liquid curtain and is intended to permanently prevent the disruptive influences of the air movements oriented in the direction of the liquid curtain.
- Another embodiment provides a hollow knife which is open at the bottom and with which air can additionally be extracted.
- a disadvantage of this proposal with all its embodiments are the dust particles generated by the friction-intensive contact of the web surface with the knife, which collect on the front of the knife, are carried away from the material web to the wetting line and thus cause coating defects.
- This proposal cannot be used for heat- and pressure-sensitive recording materials, on the recording layer of which a further coating is to be applied with the liquid curtain, for example to form a protective layer, since streaking in the recording layer can be observed due to the friction between the web surface and the knife.
- EP-A-0440279 a device for carrying out the curtain coating method is known in which an impairment of the liquid curtain formed by the use of a combination of an air shield without an air supply and extraction device with a downstream brush is to be avoided.
- the brush is much more effective than the air shield in reducing the air flow oriented towards the wetting line.
- Other embodiments provide the arrangement of several rows of brushes, if necessary in combination with plastic strips attached in front of the brushes and running across the material web, as air flow breakers.
- a known coating thickness can be achieved with the known device, but with an obviously necessary strong limitation to much too low production speeds of 200-230 m / min. The document discussed does not give any indication of air guidance systems to be used in the device.
- the object is achieved according to the invention by a curtain coating method, in which a free-falling liquid curtain is applied from at least one layer to a continuously moving web-shaped carrier material, wherein, seen in the direction of movement of the web-shaped carrier material, the air entrained by the carrier material before the wetting line by at least two Construction comprising brush rows with bristle hair resting on the carrier material being stripped from the web-shaped carrier material and being sucked off by an air suction device, and wherein the air suction device is integrated between the at least two brush rows.
- the method causes the air entrained by the carrier material to be removed in front of the wetting line, which is why continuous air removal is preferred. It also proves to be an advantage if the brush construction extends at least over the full width of the web-shaped carrier material, since this allows air to be discharged over the full width of the carrier material.
- the method according to the invention is particularly well suited if the carrier material contains a heat-sensitive or a pressure-sensitive recording layer.
- the method according to the invention enables further processing to be carried out. Layering, for example, to form a protective layer on the heat- or pressure-sensitive recording materials, even at higher production speeds, with over 500 m / min and preferably with over 800 m / min, without the liquid curtain being significantly distorted by the air entrained by the carrier material.
- the new device on which the invention is based is characterized in that, seen in the direction of movement of the web-shaped carrier material, a structure comprising at least two rows of brushes is arranged in front of the wetting line, the rows of brushes of which have bristle hairs which are intended to rest on the web-shaped carrier material, and the construction an air suction device, which is integrated between the rows of brushes.
- the device according to the invention is very helpful for cleaning the carrier material before it is coated.
- the first row of brushes seen in the direction of movement of the carrier material, whirls up the loose dust, which, for example, has unbound pigments and fine fiber material on the top of the carrier material.
- the air suction device detects this dust and removes it, which is why a dust filter integrated in the suction device is advantageous.
- the second row of brushes as seen in the direction of movement of the carrier material, prevents the dust whirled up by the first row of brushes from penetrating as far as the wetting line and also allows a second surface cleaning of the carrier material.
- the bristle hair of the last row of brushes should be arranged at a distance from the wetting line of at most 80 mm and preferably of at most 30 mm in order to safely control higher production speeds. If the distance between the last row of brushes and the wetting line is too great, ambient air near the surface of the web is entrained in such a large amount from the area between the brush construction and the liquid curtain in the direction of the wetting line that despite the use of the device according to the invention there is a distortion of the wetting line and thus that satisfactory task solution is no longer possible.
- the bristle hairs of the rows of brushes under which the carrier material is continuously moved past must, on the one hand, be soft enough, for example to cause no scratches or stripes on the surface of the heat-sensitive or pressure-sensitive recording material, for example, and on the other hand stiff enough to keep the air entrained by the carrier material away from the wetting line.
- the latter must also be ensured if the rows of brushes rest with only slight pressure on the surface of the web-shaped carrier material and the bristles of the rows of brushes are deflected only slightly from the carrier material.
- the respective thickness of the rows of brushes is in a range between 1 and 15 mm and preferably between 3 and 8 mm.
- the thickness of the rows of brushes is measured in the direction of movement of the carrier material on the lower edge of the bristle holder.
- the free length of the bristle hair, measured from the lower edge of the bristle holder to the surface of the web-shaped carrier material, is a maximum of 80 mm and preferably a maximum of 30 mm and in both cases not less than 10 mm.
- the bristle hairs can preferably be arranged in bundles which have a circular cross-section on the lower edge of the bristle holder, the diameter of which widens in the direction of the surface of the carrier material to be coated, so that the bundles have a frustoconical configuration, without the invention being based on such an embodiment the brushes or row of brushes would be limited.
- the most varied of bristle materials are possible.
- the rows of brushes comprise bristle hairs which are made of synthetic material such as polyester or polypropylene, bristle hairs made of polyamide in particular are preferred.
- the object on which the invention is based can be achieved particularly well if the bristle hairs of the rows of brushes have a maximum thickness of 0.2 mm and preferably 0.1 mm.
- the method according to the invention and the device enabling this method show very good results when the bristle hairs of the at least two rows of brushes have a maximum distance of 100 mm from one another, with a distance that makes up a maximum of 30 mm being a preferred embodiment. This distance is measured at the level of the surface of the carrier material.
- This dirt-trapping lip as seen in the direction of movement of the carrier material, is arranged behind the last row of brushes and extends at least over the full width of the web-shaped carrier material.
- Metal or plastic is particularly suitable as the material for the dirt trap lip, but is not limited to this.
- the distance of the dirt trap lip from the web-shaped carrier material is in a range between 0.5 and 2 mm. However, such a small distance is only possible if the web tends to flutter particularly little in the area of the dirt trap lip, which is particularly the case with a carrier material web that is guided in a circle or supported by guide rollers.
- a further embodiment provides for the use of an air flow refraction lip which is constructed in a constructionally comparable manner to the dirt trap lip and, viewed in the direction of movement of the carrier material, is arranged in front of the first row of brushes.
- metal or plastic can be mentioned as possible materials for the construction of the air flow refraction lip.
- a range between 0.5 and 2 mm was found to be particularly effective as the distance between the air flow-refraction lip and the web-shaped carrier material.
- the bristle holders sit on guide rails and together form brush heads.
- the guide rails of the brush heads fit snugly in the associated brush head holders. To replace dirty or damaged brush heads, they are removed from the side of the brush head holders pulled out, then the new brush heads are inserted by pushing them in from the side.
- Another embodiment provides that at least two brush constructions sit in a star shape around the central axis of a type of revolver magazine.
- the corresponding first brush construction is rotated from a working position about the turret central axis into the at least one maintenance position, while the at least second brush construction is rotated into the working position. If a brush construction is in the working position, the brushes, as described in the previous paragraphs, rest on the web-shaped carrier material and, in accordance with the task, cause the air entrained by the carrier material to be removed from the wetting line.
- the brush heads preferred in this embodiment according to the preceding paragraph which consist of guide rails with bristle holders sitting on them, can be exchanged if necessary, in particular in the maintenance position of the brush constructions.
- the rows of brushes should preferably be aligned so that they enclose an angle ⁇ of -30 ° to + 10 ° with an imaginary line that runs perpendicular to the carrier material to the center of the lower edge of the bristle holder.
- the bristle hairs point in the direction of the wetting line, while a positive setting means an orientation opposite to the direction of movement of the carrier material.
- the device according to the invention is optionally designed in the form of a curved air shield adapted to the radius of a counter-roller guiding the web-shaped carrier material or in the form of a straight-line construction seated on the linearly guided web-shaped carrier material, optionally supported by rollers or comparable construction means, without being limited thereto.
- the device according to the invention can also be combined with other systems which are used for the curtain coating process for stabilizing the free-falling liquid curtain.
- the invention is illustrated by a figure which describes the method according to the invention using the device according to the invention:
- a device (3) which comprises two rows of brushes (6a, 6b) with an integrated air suction device (5), arranged one behind the other, as seen in the direction of movement (7) of the carrier material (2).
- the air suction device (5) of which only the suction hose is shown for the sake of simplicity, has a dust filter (not shown).
- the bristle hairs of the second row of brushes (6b) closer to the wetting line (4) are at a distance (8) of 30 mm from the wetting line (4), measured at the level of the surface of the carrier material (2).
- the two rows of brushes (6a, 6b) are each formed from brush heads and from brush head holders (17a, 17b) carrying the brush heads.
- the brush heads are composed of the bristle holders (10a, 10b) having the bristle hairs (11) and guide rails (16a, 16b), to which the bristle holders (10a, 10b) are attached.
- the guide rails (16a, 16b) of the brush heads fit snugly in the brush head holders (17a, 17b) and can be pulled laterally out of the brush head holders (17a, 17b) if the brush heads are intended to be replaced.
- the respective thickness (9a, 9b) of the rows of brushes (6a, 6b), measured at the lower edge of the bristle holder (10a, 10b), is 5 mm.
- the free length (12) of the bristle hair (11) between the lower edge of the bristle holder and the surface of the web-shaped carrier material (2) is 30 mm.
- the bristle hair (11) made of polyamide has a thickness of 0.1 mm.
- the distance (13) between the bristle hairs (11) of the rows of brushes (6a, 6b) is 30 mm, measured at the level of the surface of the carrier material (2).
- a dirt trap lip (14) made of plastic is located behind the second row of brushes (6b) and is attached to the corresponding brush head holder (17b), as seen in the direction of movement (7) of the carrier material (2).
- the distance (15) between the dirt trap lip (14) and the surface of the web-shaped carrier material (2) is 1 mm, the carrier material (2) being supported in the area of the dirt trap lip (14) by a guide roller (not shown).
- the two rows of brushes (6a, 6b) are aligned at right angles to the web-shaped carrier material (2).
- the rows of brushes (6a, 6b) show a trapezoidal design in the side view.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT01945149T ATE289876T1 (de) | 2000-06-02 | 2001-05-17 | Verfahren und vorrichtung zur vorhangbeschichtung |
DE50105472T DE50105472D1 (de) | 2000-06-02 | 2001-05-17 | Verfahren und vorrichtung zur vorhangbeschichtung |
EP01945149A EP1289675B1 (de) | 2000-06-02 | 2001-05-17 | Verfahren und vorrichtung zur vorhangbeschichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10027034A DE10027034A1 (de) | 2000-06-02 | 2000-06-02 | Verfahren und Vorrichtung zur Vorhangbeschichtung |
DE10027034.4 | 2000-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001091917A1 true WO2001091917A1 (de) | 2001-12-06 |
Family
ID=7644258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/005639 WO2001091917A1 (de) | 2000-06-02 | 2001-05-17 | Verfahren und vorrichtung zur vorhangbeschichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1289675B1 (de) |
AT (1) | ATE289876T1 (de) |
DE (2) | DE10027034A1 (de) |
WO (1) | WO2001091917A1 (de) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1463674A (fr) | 1965-01-18 | 1966-06-03 | Continental Oil Co | Appareil d'enduisage à rideau |
DE1269546B (de) * | 1963-09-20 | 1974-11-14 | 4100 Duisburg Dipl Ing Jürgen Schol ten | Maschine zum Aufbringen eines Lack , Leim- oder ähnlichen Flussigkeitsfilmes |
US3867901A (en) | 1968-06-03 | 1975-02-25 | Eastman Kodak Co | Apparatus for production of photographic elements |
US4842900A (en) * | 1986-02-12 | 1989-06-27 | Fuji Photo Film Co., Ltd. | Method and apparatus for coating |
EP0440279A1 (de) | 1990-01-29 | 1991-08-07 | Agfa-Gevaert N.V. | Vorhangbeschichtungsvorrichtung für photographische Elemente |
EP0489978A1 (de) * | 1990-12-12 | 1992-06-17 | Agfa-Gevaert N.V. | Vorhangbeschichter |
EP0704752A1 (de) | 1994-09-27 | 1996-04-03 | Ilford Ag | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
EP0906789A1 (de) | 1997-10-03 | 1999-04-07 | Troller Schweizer Engineering AG | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
DE19808159A1 (de) | 1998-02-27 | 1999-09-02 | Agfa Gevaert Ag | Vorrichtung zum Vorhangbeschichten |
-
2000
- 2000-06-02 DE DE10027034A patent/DE10027034A1/de not_active Ceased
-
2001
- 2001-05-17 AT AT01945149T patent/ATE289876T1/de not_active IP Right Cessation
- 2001-05-17 WO PCT/EP2001/005639 patent/WO2001091917A1/de active IP Right Grant
- 2001-05-17 EP EP01945149A patent/EP1289675B1/de not_active Expired - Lifetime
- 2001-05-17 DE DE50105472T patent/DE50105472D1/de not_active Expired - Lifetime
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1269546B (de) * | 1963-09-20 | 1974-11-14 | 4100 Duisburg Dipl Ing Jürgen Schol ten | Maschine zum Aufbringen eines Lack , Leim- oder ähnlichen Flussigkeitsfilmes |
FR1463674A (fr) | 1965-01-18 | 1966-06-03 | Continental Oil Co | Appareil d'enduisage à rideau |
US3867901A (en) | 1968-06-03 | 1975-02-25 | Eastman Kodak Co | Apparatus for production of photographic elements |
US4842900A (en) * | 1986-02-12 | 1989-06-27 | Fuji Photo Film Co., Ltd. | Method and apparatus for coating |
EP0440279A1 (de) | 1990-01-29 | 1991-08-07 | Agfa-Gevaert N.V. | Vorhangbeschichtungsvorrichtung für photographische Elemente |
EP0489978A1 (de) * | 1990-12-12 | 1992-06-17 | Agfa-Gevaert N.V. | Vorhangbeschichter |
US5224996A (en) | 1990-12-12 | 1993-07-06 | Agfa-Gevaert N.V. | Curtain coater |
EP0489978B1 (de) | 1990-12-12 | 1996-03-20 | Agfa-Gevaert N.V. | Vorhangbeschichter |
EP0704752A1 (de) | 1994-09-27 | 1996-04-03 | Ilford Ag | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
EP0906789A1 (de) | 1997-10-03 | 1999-04-07 | Troller Schweizer Engineering AG | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
DE19808159A1 (de) | 1998-02-27 | 1999-09-02 | Agfa Gevaert Ag | Vorrichtung zum Vorhangbeschichten |
Also Published As
Publication number | Publication date |
---|---|
EP1289675A1 (de) | 2003-03-12 |
DE50105472D1 (de) | 2005-04-07 |
DE10027034A1 (de) | 2001-12-13 |
EP1289675B1 (de) | 2005-03-02 |
ATE289876T1 (de) | 2005-03-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE60105477T2 (de) | Beschichtungs-Vorrichtung und Verfahren | |
EP0667414B1 (de) | Rakelvorrichtung | |
DE3024113A1 (de) | Reinigungskopf zur reinigung von planen flaechen | |
EP0609693B1 (de) | Einrichtung zum einfangen eines vagabundierenden aerosol in einer rotationsdruckmaschine | |
DE202017100655U1 (de) | Vorrichtung zur Behandlung von Faserbahnen | |
EP0918579B1 (de) | Vorrichtung zum entfernen von flüssigkeit von der oberfläche eines bandes | |
DE68919699T2 (de) | Vorhangsbeschichtung, verfahren und apparat. | |
DE3241831A1 (de) | Verfahren und vorrichtung zur erzeugung der breite oder der streifenbreite von beschichtungen auf bahnen | |
DE1786108B2 (de) | Vorrichtung zum kontinuerhchen Entstauben von Materialbahnen | |
DE102008040403A1 (de) | Vorhang-Auftragswerk | |
DE10012345A1 (de) | Vorhang-Auftragsvorrichtung | |
EP1289675B1 (de) | Verfahren und vorrichtung zur vorhangbeschichtung | |
DE69309572T2 (de) | Auftragsverfahren und -vorrichtung | |
DE3040503A1 (de) | Verfahren und vorrichtung zum fortlaufenden beschichten eines metallbandes | |
DE102005036667A1 (de) | Auftragsverfahren | |
EP0278373B1 (de) | Düse zum Abblasen kontinuierlich bewegter Oberflächen | |
DE10117667A1 (de) | Vorrichtung zum Absaugen einer Luftgrenzschicht von einer laufenden Materialbahn | |
DE102005059966B4 (de) | Vorhangbeschichter mit seitlich verstellbarer Abkantung | |
DE102004063696A1 (de) | Auftragsvorrichtung | |
DE629418C (de) | Abstaubvorrichtung | |
DE19633741A1 (de) | Vorrichtung zum Benetzen einer Seite einer laufenden Materialbahn | |
DE3309173C2 (de) | Vorrichtung zum Entfernen von Kühlwasser von Band- und Blechoberflächen | |
DE4336271A1 (de) | Blaseinrichtung zum Reinigen einer Trägerbahn eines Siebes in einer Papiermaschine | |
EP1538263A1 (de) | Beschichtungsvorrichtung | |
DE102007000779A1 (de) | Auftragsvorrichtung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): CN JP KR US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2001945149 Country of ref document: EP |
|
WWP | Wipo information: published in national office |
Ref document number: 2001945149 Country of ref document: EP |
|
WWG | Wipo information: grant in national office |
Ref document number: 2001945149 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP |