EP0642613A1 - Vorrichtung zum beschichten einer papier- oder kartonbahn. - Google Patents
Vorrichtung zum beschichten einer papier- oder kartonbahn.Info
- Publication number
- EP0642613A1 EP0642613A1 EP94912508A EP94912508A EP0642613A1 EP 0642613 A1 EP0642613 A1 EP 0642613A1 EP 94912508 A EP94912508 A EP 94912508A EP 94912508 A EP94912508 A EP 94912508A EP 0642613 A1 EP0642613 A1 EP 0642613A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- application
- counter
- web
- bed
- 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.)
- Granted
Links
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
- 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
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
Definitions
- the invention relates to a device for coating a paper or cardboard web according to the preamble of patent claim 1.
- devices For coating paper or cardboard webs, devices are known with a counter-roll deflecting the web, in which an application system in the area of the counter-roller wrapped by the web applies the coating material in excess to the web, and a metering system with a distance behind the application system in the web running direction a squeegee element is arranged, which strips off the excess up to the desired coat weight.
- the application system consists of an application roller which can be rotated by means of a drive and which forms a coating gap with the counter roller, to which coating material is supplied in excess from the web entry side.
- An essential feature of this application system which is referred to as a roller application unit (flooded nip coater), is that there is a fixed gap between the counter roller and the application roller, so that it is not pressed against the web. Furthermore, the coating material is fed to the application gap with the lowest possible pressure, it being necessary to ensure that the application gap is completely filled for a uniform coating.
- DE-OS 37 35 889 describes a so-called short dwell coater with an application chamber which is open to the counter roll, into which coating material is fed under higher pressure and which is closed at the web exit end by a doctor element pressed against the counter roll.
- the application chamber is used as a pre-metering device, at the outlet end of which a doctor blade rod with circumferential grooves is arranged, which is pressed onto the material web or counter roller by means of a pressure hose.
- the application rollers of roller applicators must have larger and larger diameters so that they are sufficiently stable, on the one hand, to keep the application gap constant across the width hold, i.e. no disturbing deflection occurs, and on the other hand to avoid disturbing dynamic effects (vibrations).
- a large application roller diameter has the disadvantage that the metering system must be arranged at a relatively large distance from the application gap due to the large installation space. A long penetration distance between application and doctoring can lead to larger minimum coat weights because the material that has penetrated the web can no longer be doctored.
- the invention has for its object to improve a generic coating device so that at high web speeds and large web widths with a lower design effort, a uniform application can be achieved even with a small excess.
- the metering system can advantageously be arranged at a short distance behind the application system due to the small diameter of the application roller.
- the support of the application roller considerably reduces deflection effects due to its own weight or hydrodynamics in the application gap, so that even smaller gap widths can be adjusted to - if desired - evenly apply a small excess.
- the smaller diameter of the application roller leads to a significantly lower hydrodynamic pressure in the application nip, especially in the case of wide and fast devices. This results in less penetration of the coating material into the web, with advantageous effects on the quality, especially with lower coat weights. Line errors due to film splitting and tension line formation are also significantly reduced.
- the deflection effects are minimal and the elasticity of the system can be adjusted to desired values.
- the elasticity of the application roller-bed-holder system is sufficiently low to ensure the stability of the gap against the hydrodynamic pressure.
- the stability of the gap does not impair elasticity, so that the applicator roller in the event of malfunctions, for. B. can avoid a continuous glue point.
- claim 6 contains an advantageous embodiment of the bed for lubricating and cleaning the applicator roller, preferably with water.
- a lip-shaped inner wall of the bed according to claim 7 keeps the applicator roller clean by scraping off adhering contaminants when rotating.
- Claim 8 contains an advantageous structural design of the bed of the applicator roller in order to be able to replace it quickly and easily if necessary.
- the embodiment according to claim 9 with the baffle has the advantage that even larger gap widths of the application gap can be set without uncovered areas occurring.
- the baffle separates the incoming and the recycled coating material, thus avoiding turbulence in the application gap.
- the embodiment with a baffle arranged in a paint chamber according to claim 10 brings about a comparative, calm feeding of coating material into the application gap.
- a scraper knife arranged in front of the applicator roller according to claim 1 1 considerably reduces the entry of air into the coating material by the web.
- Figure 1 is a side view of a coating device with an application system according to the invention, in which the application roller is stored in a bed
- Figure 2 is an enlarged view of the application system.
- 3 and 4 show embodiments with a coating device in which the application roller is supported by a bearing.
- the coating device has a driven counter-roller 2 deflecting the paper or cardboard web 1, in the area of which the web 1 wraps Application system 3 and in the web running direction at a distance behind a metering system 4 is arranged, which contains a doctor blade 5 as a doctor element.
- the scraper knife 5 is clamped in a known manner with its foot in a clamping bar 6 which can be displaced in the direction of the counter roll 2.
- the application system 3 shown enlarged in FIG. 2 contains an application roller 8 connected to a rotary drive with a diameter of 5 mm to 200 mm, preferably 10 mm to 150 mm, which is arranged axially parallel to the counter roller 2 in such a way that between the web 1 the narrowest point forms an application gap 9 of 0.01 mm to 2 mm, preferably 0.05 mm to 1 mm.
- the smallest distance from the counter roll 2 is therefore these values plus the paper or cardboard thickness of the web 1.
- the axial length of the applicator roller 8 extends at least over the length of the counter roller 2, that is to say the maximum web width. It is preferably made of steel with a smooth outer surface and on its back facing away from the counter-roller 2 over the entire working width, i.e.
- the applicator roller 8 is mounted in a bed 10, 11 made of a limited elastic, rubber-like material open to the counter roller 2.
- the bed 10, 1 1 is made of rubber and consists of two mirror-symmetrical parts 10, 1 1, which are fitted into a holder 12 so as to be movable relative to and away from one another.
- the holder 1 2 extends like the bed 10, 1 1 over the entire working width and is made of a rigid material, for. B. aluminum.
- the holder 12 has a central slot which extends radially to the counter-roller 2 and is fitted in a U-shaped carrier 13 which is screwed onto a pivotable cross member 14.
- a pressure hose 15 extends over the working width, with which the two parts of the holder 12 can be compressed so that the bed 10, 11 holds the applicator roller 8 securely.
- the inner walls of the bed 10, 1 1 are designed so that they rest only in sections on the applicator roller 8. At least one inner wall is preferably designed in the form of an axially extending lip in order to Rotate the application roller 8 scrape off adhering contaminants.
- 8 open channels 16 are incorporated into the inner walls of the applicator roll, into which water is introduced as a lubricant and cleaning agent during operation. For a secure hold of the applicator roller 8, it is covered on its outer circumference in a range of at least 180 ° by the bed 10, 1 1. To replace an applicator roller 8, the pressure hose 15 is relieved, thereby opening the two parts 10, 11 of the bed, and the applicator roller 8 can be removed.
- the application roller 8 is supported over the entire working width in such a way that the set gap width of the application gap 9 is retained at the hydrodynamic pressure that occurs.
- the applicator roller 8 is held by a bed 10, 1 1, which is fitted in a holder 12 which is rigidly configured radially to the counter-roller 2 and is immovably and rigidly stored in the working position.
- the supply of coating material into the application gap 9 takes place on the inlet side via a feed channel 17 which is formed by a guide plate 18 which extends into the vicinity of the application gap 9 and the inlet-side flank of the holder 1 2 or the circumference of the application roller 8.
- the feed channel 17 extends at an acute angle to the tangent to the counter roller 2 in the application nip 9. It is connected to an ink chamber 19 which extends over the entire working width and which is connected via an inlet side Distribution pipe 20 coating material is supplied.
- the back of the guide plate 18 facing away from the application roller 8 is designed as a drainage surface for excess coating material.
- the guide plate 18 thus separates the supply of the coating material conveyed in excess into the application gap 9 from the return. This avoids turbulence in the coating material, and the excess rate can be set to lower values or the application gap to larger values without uncovered areas occurring.
- the returned coating material is collected in an ink pan 21 and returned to the ink chamber 19.
- the guide plate 22 In the ink chamber 19 there is a guide plate 22 which extends over the working width and radially to the counter roller 2 and ends at a distance from the chamber bottom.
- the guide plate 22 forms with the outlet-side wall of the ink chamber 19 a channel 23 with a slot-shaped inlet opening, which opens into the feed channel 19.
- a damming wall opposite the distributor pipe 20 it prevents irregularities in the supplied coating material from propagating into the feed channel 17 and thus equalizes the pressure and the flow conditions in this and in the application gap 9.
- the guide plate 22 enables the ink chamber 19 to be vented without unevenness in the supply of coating material in the application gap 9. In this way, unwanted air pockets can be removed from the coating material.
- a scraper knife 24 is arranged at a short distance in front of the guide plate 18 and approximately parallel to it, the scraper knife 24 resting against the web 1 with its tip.
- the scraper knife 24 is shown in FIGS. 1 and 2; it can also be used in the embodiments according to FIGS. 3 and 4.
- the application systems 3 according to FIGS. 3 and 4 each contain an application roller 8 with a larger diameter between 50 mm and 200 mm, preferably between 50 mm and 1 50 mm.
- Such application rollers 8 are hung with roller journals on their end faces in pivot bearings which are fastened on both long sides of the frame.
- a support bearing 26, 27 is arranged between the crossmember 14 and the application roller 8 as a holder, which extends over the entire working width (ie the length of the application roller 8) and deflections of the application roller 8 due to their own weight and / or the hydrodynamic pressure in the application gap 9 prevented.
- the support bearing 26, 27 is preferably shaped on its surface facing the application roller 8 in such a way that the application roller 8 is supported flatly.
- Each support bearing 26, 27 is made of a hard material with low friction to the applicator roller 8, preferably hard rubber or rubber-like plastic, if the applicator roller 8 coated with hard metal, z. B. chrome, or made of a hard metal, if the applicator roller 8 is coated with rubber or a rubber-like plastic.
- the surface of the support bearing 27 according to FIG. 4, which bears against the application roller 8, is lip-shaped, similar to the bed 10, 11 according to FIG. 2, on the inlet and outlet sides, so that adhering impurities are scraped off when the application roller 8 is rotated.
- the application roller 8 is driven with or in the opposite direction to the counter roller 2.
- the co-operation of the applicator roller 8 has the advantage that the applicator roller 8 also draws from the feed channel 17 and thus supports the filling of the application gap 9.
- film splitting effects and tension line formation are advantageously further reduced.
- the peripheral speed of the application roller 8 during application is greater than 0 m / min and less than 100 m / min, preferably it is between 2 m / min and 20 m / min.
- the application system 3 is thus able to evenly apply small excess amounts to the web 1.
- the excess is scraped off again by the scraper knife 5 of the subsequent metering system 4 to the desired coat weight and returned to an ink pan 25.
Landscapes
- Coating Apparatus (AREA)
- Paper (AREA)
- Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
- Container Filling Or Packaging Operations (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4309937A DE4309937A1 (de) | 1993-03-26 | 1993-03-26 | Vorrichtung zum Beschichten einer Papier- oder Kartonbahn |
DE4309937 | 1993-03-26 | ||
PCT/EP1994/000908 WO1994023126A1 (de) | 1993-03-26 | 1994-03-23 | Vorrichtung zum beschichten einer papier- oder kartonbahn |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0642613A1 true EP0642613A1 (de) | 1995-03-15 |
EP0642613B1 EP0642613B1 (de) | 1996-08-28 |
Family
ID=6483978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94912508A Expired - Lifetime EP0642613B1 (de) | 1993-03-26 | 1994-03-23 | Vorrichtung zum beschichten einer papier- oder kartonbahn |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0642613B1 (de) |
JP (1) | JPH07507495A (de) |
AT (1) | ATE141974T1 (de) |
BR (1) | BR9404762A (de) |
DE (2) | DE4309937A1 (de) |
ES (1) | ES2095162T3 (de) |
FI (1) | FI99038C (de) |
WO (1) | WO1994023126A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6534113B1 (en) | 1998-05-19 | 2003-03-18 | Voith Sulzer Papiertechnik Patent Gmbh | Method of controlling the amount of coating applied on a moving material web |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0757129B1 (de) * | 1995-07-29 | 2001-12-05 | Jagenberg Papiertechnik GmbH | Auftragsystem für eine Vorrichtung zum Beschichten einer Papier- oder Kartonbahn |
DE19527902B4 (de) * | 1995-07-29 | 2004-02-26 | Voith Paper Patent Gmbh | Auftragsystem für eine Vorrichtung zum Beschichten einer Papier- oder Kartonbahn |
DE102012217683B3 (de) * | 2012-09-27 | 2014-02-20 | Volkswagen Varta Microbattery Forschungsgesellschaft Mbh & Co. Kg | Schaltbares Schlitzventil für eine Beschichtungsanlage, Beschichtungsanlage und Verwendung der Anlage |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3623402A1 (de) * | 1985-07-31 | 1987-05-21 | Jagenberg Ag | Verfahren und vorrichtung zum kontinuierlichen aufbringen einer gleichmaessigen beschichtung auf eine ueber eine gegenwalze laufende materialbahn, insbesondere papier- oder kartonbahn |
FI853041A0 (fi) * | 1985-08-07 | 1985-08-07 | Valmet Oy | Anordning foer belaeggning av materialbana. |
-
1993
- 1993-03-26 DE DE4309937A patent/DE4309937A1/de not_active Withdrawn
-
1994
- 1994-03-23 DE DE59400550T patent/DE59400550D1/de not_active Expired - Fee Related
- 1994-03-23 WO PCT/EP1994/000908 patent/WO1994023126A1/de active IP Right Grant
- 1994-03-23 BR BR9404762A patent/BR9404762A/pt not_active IP Right Cessation
- 1994-03-23 EP EP94912508A patent/EP0642613B1/de not_active Expired - Lifetime
- 1994-03-23 JP JP6521636A patent/JPH07507495A/ja active Pending
- 1994-03-23 ES ES94912508T patent/ES2095162T3/es not_active Expired - Lifetime
- 1994-03-23 AT AT94912508T patent/ATE141974T1/de not_active IP Right Cessation
- 1994-11-25 FI FI945542A patent/FI99038C/fi not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9423126A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6534113B1 (en) | 1998-05-19 | 2003-03-18 | Voith Sulzer Papiertechnik Patent Gmbh | Method of controlling the amount of coating applied on a moving material web |
Also Published As
Publication number | Publication date |
---|---|
ES2095162T3 (es) | 1997-02-01 |
BR9404762A (pt) | 1999-06-15 |
DE4309937A1 (de) | 1994-09-29 |
JPH07507495A (ja) | 1995-08-24 |
FI99038C (fi) | 1997-09-25 |
ATE141974T1 (de) | 1996-09-15 |
WO1994023126A1 (de) | 1994-10-13 |
FI945542A0 (fi) | 1994-11-25 |
DE59400550D1 (de) | 1996-10-02 |
FI99038B (fi) | 1997-06-13 |
FI945542A (fi) | 1994-11-25 |
EP0642613B1 (de) | 1996-08-28 |
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