WO2006056386A1 - Anordnung und verfahren zur vorhangbeschichtung bewegter substrate - Google Patents
Anordnung und verfahren zur vorhangbeschichtung bewegter substrate Download PDFInfo
- Publication number
- WO2006056386A1 WO2006056386A1 PCT/EP2005/012440 EP2005012440W WO2006056386A1 WO 2006056386 A1 WO2006056386 A1 WO 2006056386A1 EP 2005012440 W EP2005012440 W EP 2005012440W WO 2006056386 A1 WO2006056386 A1 WO 2006056386A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- curtain
- coating
- substrate
- line
- liquid coating
- 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 an arrangement and a method for curtain coating (Curtain Coating) for applying thin films on beweg ⁇ te substrates. More particularly, the present invention relates to a curtain coater having a vacuum device movably disposed relative to a line of impact of a liquid coating curtain on a substrate surface. Such devices are used, for example, in the coating of paper, adhesive tapes or even in the coating of photographic films.
- a corresponding coating liquid for example a solvent or else a dispersion or solution
- a corresponding coating head By means of a correspondingly shaped casting gap, a pouring lip or a cascade, the coating liquid is formed into a free-falling curtain, which impinges on a substrate moving transversely to the direction of fall of the curtain.
- Typical speeds for the movement of the substrate are, for example, in the case of paper coating in the range of a few 100 m / min.
- EP 0 440 279 A1 discloses a curtain coater for coating photographic elements, in which an "air shield" and a brush construction are arranged in the substrate movement direction in front of the impingement line of the liquid coating curtain on the substrate surface. Both of these elements are believed to help cause peeling of the air boundary layer from the substrate surface immediately prior to the liquid coating curtain impacting, however, the design shown has the disadvantage of air swirling on the substrate surface immediately before the impact line due to the air shield and brush construction In addition, brushes themselves can contribute to impurities on the substrate surface, since brushes are easily contaminated can accumulate gene, which then z. T. again detached from the brush and can get between the substrate and film.
- EP 0 489 978 A1 discloses an "air shield", which additionally comprises means for reducing the air pressure between the air shield and the substrate surface, thereby removing the air boundary layer from the substrate surface, also from EP 0 704 752 A1, EP 0 906 789 B1 and US Pat. No. 4,842,900, corresponding devices are known in which the air boundary layer on the surface of the substrate can be influenced by appropriate suction immediately before the coating curtain impinges.
- EP 0 704 752 A1 has, for this purpose, a suction device fixedly connected to a curtain generator and having an edge which uses the air boundary layer by means of a vacuum pump immediately before the impact of the coating curtain from the substrate surface.
- a device is proposed in which the air entrained by the moving carrier is influenced in such a way via two layers of porous material and a supply and a suction device that a parabolic Ge above the substrate surface speed profile of entrained air layer forms.
- US Pat. No. 4,842,900 moreover has a device fixedly connected to a curtain generator, which exchanges the air boundary layer on the substrate surface directly against the impingement line of the coating curtain on the substrate surface against a gas which has a higher solubility in comparison to air having the coating liquid.
- this heel or liquid bead opposite to the direction of movement depends on numerous factors, such as the falling speed of the liquid curtain in the impact line, the surface tension of the liquid or the direction of movement of the substrate to be coated in the line of incidence of the liquid coating curtain.
- the formation of this liquid bead or heel which in particular can also vary in its strength along the impact line, considerably influences the coating quality of the curtain coating.
- the processes known from the state of the art, which have been described above and serve predominantly to influence or reduce the air boundary layer on the substrate surface do not take this phenomenon of heel formation into account.
- there may be a correlation between the influence of the air boundary layer and the influence of the heel formation on the coating quality so that a Separate solution of both problems is associated with considerable difficulties, which in turn have a negative effect on the coating quality.
- the possibility should be given to jointly minimize both the problem of air boundary layer formation and the problem of heel formation, thereby optimizing the coating quality.
- a curtain coater is proposed for coating a substrate surface of a moved substrate by means of a liquid coating curtain.
- the curtain coater has a curtain generator for producing the liquid coating curtain.
- this curtain generator can be, for example, a single-layered curtain generator or else a multi-layered curtain generator, for example by means of a cascade coating.
- Other embodiments are possible and do not affect the gist of the invention.
- a liquid material is a great flexibility.
- dispersions or even different solutions or other liquids can be used for curtain coating.
- curtain coaters which have a plurality of curtain producers which, for example, are connected in series.
- the substrates may be, for example, flexible substrates, such as eg moving film webs, or even rigid substrates.
- the coating of several substrates at the same time is also conceivable.
- substrates of relatively small size for example rectangular plates, or also "large” substrates, for example “endless substrates” (eg film webs)
- the liquid coating curtain should impinge on the substrate surface of the moving substrate along a line of impact.
- the curtain coater has a substrate conveying device which can set the substrate in motion relative to the curtain generator or relative to the impact line.
- the substrate conveying device itself is advantageously arranged in a fixed space during the coating process to the curtain generator or to the impingement line.
- the substrate conveying device can be, for example, a conveyor belt, a roller system or other systems, which in particular can advantageously be adapted to the type of substrate.
- the curtain coater for coating the substrate surface has a vacuum device for locally influencing a gas boundary layer over the substrate surface.
- This influencing should take place within an area of influence (which, mutatis mutandis, can also be several contiguous or separated influence areas).
- the vacuum device is arranged in the direction of movement of the substrate in front of the impact line of the liquid coating curtain.
- the vacuum device may, for example, be one of the devices mentioned in the prior art, whereby analogously not only a simple negative pressure may be applied, but also, for example, a targeted exchange of air for another gaseous medium or a targeted one Adjustment of a flow profile of a gaseous medium over the surface of the substrate. In principle, all of the devices described above can be used.
- the vacuum device is arranged movably relative to the line of impact of the liquid coating curtain on the substrate surface.
- This movable arrangement can take place, for example, in that the vacuum device is held stationary relative to the substrate conveying device by means of a holding device, wherein the holding can take place in at least two different positions.
- This can take place, for example, in that the holding device has at least one guide groove, along which the vacuum device is movable.
- the curtain generator is movable relative to the substrate conveying device such that the position of the line of incidence of the liquid coating curtain on the substrate surface relative to the Substratschivorrich ⁇ device is adjustable.
- the problem initially arises by adjusting the position of the contact line of the liquid coating curtain on the substrate surface minimize heel formation.
- the speed of the substrate and the properties of the coating liquid play a role.
- an optimum position of the impingement line can be determined in which the influence of the heel formation on the coating quality is minimized.
- the substrate conveying device has at least one coating roller, for example in the form of a circular cylinder, wherein a flexible Substart is guided over this at least one coating roller ,
- at least one coating roller for example in the form of a circular cylinder, wherein a flexible Substart is guided over this at least one coating roller .
- the vacuum device is tracked in position, so that the second above-mentioned interference, namely the influence of a Gasgrenz ⁇ layer over the substrate surface, can be minimized.
- This can be done, for example, by minimizing the distance between the vacuum device and the contact line of the liquid coating curtain or setting it to an optimum value.
- the vacuum device is arranged to be movable such that the distance along the substrate surface is between the range of influence of the vacuum device and the impingement line of the liquid coating curtain to a value in the range of 3 mm to 50 mm, vor ⁇ preferably a range of 3 to 30 mm and more preferably a range of 5 to 15 mm is adjustable.
- the vacuum device has a plurality of influence regions, the distance between an influence region of the vacuum device closest to the contact line and the impact line can be understood analogously, for example.
- the distance can under the "Distance” is understood analogously to a curve length, for example along the curved surface of the substrate. This optimization of the distances has shown in practice a particularly high coating quality.
- the position of the impact line in such a way that the angle between the liquid coating curtain and the substrate surface in the impact line is optimized.
- This can be done, in particular, by the fact that the liquid coating curtain has an impact velocity v c in the impact line and the substrate has a substrate velocity v s .
- This development of the invention has the particular advantage that it is possible to achieve particularly high substrate speeds, for example up to 1,200 m / min or even up to 1,500 m / min.
- Typical devices known in the art allow only substrate speeds up to about 300 to 400 meters per minute.
- the described arrangement, in which a joint optimization of the influences of the air boundary layers and the heel formation is possible, permits an excellent coating quality.
- Figure 1 is a sectional view of a coating of a guided on a cylindrical coating rollers flexible substrate in the "12 o'clock position";
- FIG. 2 shows a coating according to the invention of a substrate according to FIG. 1 in a position different from the "12 o'clock position" for minimizing the
- Figure 3 is a schematic representation of the auf ⁇ in an arrangement according to Figure 2 auf ⁇ passing distances, angles and speeds;
- FIG. 4 shows an arrangement according to the invention for curtain coating
- FIG. 5 shows a schematic flow chart of a method according to the invention for curtain coating.
- FIG. 1 illustrates by way of example the problem of heel formation in the curtain coating of a flexible substrate with a liquid coating curtain.
- a flexible substrate 110 for example a plastic film
- the coating roller 112 essentially has the shape of a circular cylinder with a radius R of 175 mm.
- the coating roller 112 rotates in the direction of rotation 114 in such a way that the substrate 110 has a speed of approximately 1,500 m per minute on its substrate surface 111 facing away from the coating roller 112. Even higher speeds are possible.
- a liquid coating curtain 116 strikes the substrate surface 111 along a line of incidence 118 (which also has a finite thickness due to a finite thickness of the coating curtain 116) perpendicular to the plane of the drawing in FIG.
- the coating liquid is carried along by the moving substrate 110 in such a way that a film 120 forms on the substrate surface 111.
- the coating liquid for the liquid coating curtain 116 in this embodiment is a commercial dispersion having a viscosity of 100-3000 mPa * s, advantageously in the range of about 400-600 mPa * s, with a surface tension of about 25%. 40 mN / m used.
- the liquid coating curtain 116 lays down to hitting the impact line 118 a distance .DELTA.s of about 100 mm (but other settings are possible) in free fall, so that he in the impact line 118 a fall rate of about 1, 4 m / s.
- the impact line 118 lies perpendicularly above an axis 122 of the coating roller 112.
- This position is also referred to as the "12 o'clock position.”
- a particularly embossed heel 124 is formed, which can disturb the film quality of the film 120 with high probability. This shows a strong dependence of the coating quality on the substrate speed, the probability that a pronounced Heel 124 the coating quality adversely affected, increases sharply with increasing Substratge ⁇ speed.
- a curtain coating is shown in which the coating does not take place in the "12 o'clock position.”
- the coating curtain 116 is adjusted such that the coating curtain 116 impinges on the substrate surface 111 in an impingement line 118, wherein any vertical connection between the axis 122 and the impingement line 118 originating from the axis 122 of the coating roller 112 is inclined by an angle ⁇
- the angles in a range between 4.9 ° and 16.6 °, advantageously at approximately 8.2 ° have proven to be particularly advantageous for the combination of Coating liquid, substrate speed and arrangement geometry.
- FIG. 3 shows diagrammatically the dimensions, angles and speeds which occur in the coating according to the preferred exemplary embodiment according to FIG. It is neglected that the substrate 110 has a finite thickness, so that in the simplified representation according to FIG. 3 an impact of the coating curtain 116 is taken directly onto the coating roller 112 in the impact line 118.
- the simplifications assumed in this case are regularly negligible in practice, since typical substrates 110 have a negligible thickness compared to the radius R of the coating roller 112.
- this distance ⁇ x is advantageously in a range between 15 mm and 50 mm, particularly advantageously around 25 mm above-mentioned range of particularly advantageous Winkelein ⁇ settings for the angle ⁇ .
- this angle ⁇ is smaller than 90 ° and is advantageously set to a range of 85.1 ° to 73.4 °, but particularly advantageously to a range of approximately 81.7 ° to 81.8 °. It has been shown that the influence of the heel formation on the quality of the film 120 is minimized in particular for the combination of coating liquid, arrangement geometry and substrate speed given above with this angle adjustment, and thus the quality of the film 120 is optimized.
- the scalar product of the vectors v s 312 and v c 314 is positive in this arrangement.
- the scalar product is obtained a wide range between about 0.4 and about 3000 m 2 / s 2 .
- the scalar product is between 1 and 2000 m 2 / s 2 and very particularly preferably in the range between 100 and 1000 m 2 / s 2 and ideally, as already mentioned, in the range of about 300 m 2 / s 2 .
- FIG. 4 shows a preferred exemplary embodiment of a curtain coater 410 with which, for example, a coating according to the exemplary embodiments according to FIG. 2 (or FIG. 3) can be converted.
- the curtain coater 410 in turn has a coating roller 112, via which a flexible substrate 110, for example a plastic film, is guided.
- the curtain coater 410 includes a curtain generator 412 having a nozzle tip 414 that creates a free flowing liquid coating curtain 116.
- the liquid coating curtain 116 strikes the substrate 110 along the impingement line 118.
- the position of the curtain generator 412 relative to the coating roller 112 can be adjusted in this embodiment in a wide range, which is shown symbolically in Figure 4 by the double arrow 416.
- This can be a setting 4 along a linear axis 416 as shown in FIG. 4 or, alternatively, adjustment along a curved axis.
- the latter offers, for example, the possibility that the position of the curtain generator 412 is set in the horizontal direction, whereby at the same time the distance ⁇ s between the nozzle tip 414 and the impact line 118 is kept constant.
- the arrangement shown in FIG. 4 permits, in particular, an adjustment of the abovementioned preferred coating position in one of the aforementioned angles ⁇ relative to the vertical.
- the curtain generator 410 shown in FIG. 4 has a vacuum device 418.
- this is a commercial vacuum device 418, as is known, for example, from EP 0 906 789 B1.
- this commercial vacuum device 418 has been modified so that the vacuum device 418 is adjustable in position relative to the platen roller 12.
- the device shown in FIG. 4 has a holding device 420, which has a guide groove 422 in the form of a curved elongated hole concentric with the axis 122 of the coating roller 112.
- the vacuum device 418 can be fixed via screw pairs 424 in this guide groove 422 and thus adjustable in position.
- the adjustment can be made such that the vacuum device 418 can be rotated concentrically about the axis 122 of the coating roller 112, wherein the distance between the vacuum device 418 and the substrate surface 111 is kept constant.
- the position of an influence region 426, within which the underpressure device 418 influences an air boundary layer above the substrate 110 is displaced along the substrate surface 111.
- a distance d between the influence region 426 of the vacuum device 418 and the impact line 118 of the liquid coating curtain 116 can also be adjusted by appropriate positioning of the vacuum device 418.
- This configuration makes it possible, after optimizing the impingement line 118, to optimize the position of the vacuum device 418 in order to minimize a negative influence of the air boundary layer on the coating quality.
- FIG. 5 schematically shows a flow chart of a method according to the invention, in which an arrangement according to the invention, for example the arrangement 410 shown in FIG. 4, is used.
- the illustrated method steps do not necessarily have to be carried out in the stated order, and additional method steps not shown in FIG. 5 could also be carried out.
- the liquid coating curtain 116 is first produced by means of the curtain generator 412. This strikes the moving substrate 110 along the line of incidence 118.
- the position of the curtain generator 412 relative to the substrate conveyor 112, such as the coating roller 112 is adjusted so that the coating quality of the curtain coating is optimal. In particular, the influence of the above-described heel formation is minimized.
- the position of the vacuum device 418 is adjusted such that air inclusions during the coating are minimized.
- the distance d between the influence region 426 of the vacuum device 418 and the impact line 118 of the liquid coating curtain 116 can be set to one of the abovementioned values.
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE502005004310T DE502005004310D1 (de) | 2004-11-22 | 2005-11-21 | Anordnung und verfahren zur vorhangbeschichtung bewegter substrate |
EP05814358A EP1817116B1 (de) | 2004-11-22 | 2005-11-21 | Anordnung und verfahren zur vorhangbeschichtung bewegter substrate |
ES05814358T ES2304735T3 (es) | 2004-11-22 | 2005-11-21 | Disposicion y metodo para el recubrimiento de cortina de sustratos en movimiento. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004056271A DE102004056271A1 (de) | 2004-11-22 | 2004-11-22 | Anordnung und Verfahren zur Vorhangbeschichtung bewegter Substrate |
DE102004056271.7 | 2004-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006056386A1 true WO2006056386A1 (de) | 2006-06-01 |
Family
ID=35759087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/012440 WO2006056386A1 (de) | 2004-11-22 | 2005-11-21 | Anordnung und verfahren zur vorhangbeschichtung bewegter substrate |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1817116B1 (de) |
AT (1) | ATE396789T1 (de) |
DE (2) | DE102004056271A1 (de) |
ES (1) | ES2304735T3 (de) |
WO (1) | WO2006056386A1 (de) |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3369522A (en) * | 1965-01-18 | 1968-02-20 | Continental Oil Co | Curtain coating apparatus |
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 |
US6146690A (en) * | 1998-07-01 | 2000-11-14 | Voith Sulzer Papiertechnik Patent Gmbh | Coating device and coating method |
US20030145785A1 (en) * | 2000-03-14 | 2003-08-07 | Richard Bernert | Application device |
US20040107899A1 (en) * | 2001-05-23 | 2004-06-10 | Richard Bernert | Application device |
EP1428582A1 (de) * | 2002-12-12 | 2004-06-16 | Metso Paper, Inc. | Verfahren und Vorrichtung zum Vorhang- Beschichten |
-
2004
- 2004-11-22 DE DE102004056271A patent/DE102004056271A1/de not_active Withdrawn
-
2005
- 2005-11-21 ES ES05814358T patent/ES2304735T3/es active Active
- 2005-11-21 EP EP05814358A patent/EP1817116B1/de active Active
- 2005-11-21 WO PCT/EP2005/012440 patent/WO2006056386A1/de active IP Right Grant
- 2005-11-21 DE DE502005004310T patent/DE502005004310D1/de active Active
- 2005-11-21 AT AT05814358T patent/ATE396789T1/de not_active IP Right Cessation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3369522A (en) * | 1965-01-18 | 1968-02-20 | Continental Oil Co | Curtain coating apparatus |
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 |
US6146690A (en) * | 1998-07-01 | 2000-11-14 | Voith Sulzer Papiertechnik Patent Gmbh | Coating device and coating method |
US20030145785A1 (en) * | 2000-03-14 | 2003-08-07 | Richard Bernert | Application device |
US20040107899A1 (en) * | 2001-05-23 | 2004-06-10 | Richard Bernert | Application device |
EP1428582A1 (de) * | 2002-12-12 | 2004-06-16 | Metso Paper, Inc. | Verfahren und Vorrichtung zum Vorhang- Beschichten |
Also Published As
Publication number | Publication date |
---|---|
EP1817116B1 (de) | 2008-05-28 |
DE502005004310D1 (de) | 2008-07-10 |
EP1817116A1 (de) | 2007-08-15 |
DE102004056271A1 (de) | 2006-05-24 |
ATE396789T1 (de) | 2008-06-15 |
ES2304735T3 (es) | 2008-10-16 |
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