EP0977920A1 - Procede et dispositif pour appliquer un bain de couchage au pigment sur une bande de papier ou de carton - Google Patents

Procede et dispositif pour appliquer un bain de couchage au pigment sur une bande de papier ou de carton

Info

Publication number
EP0977920A1
EP0977920A1 EP98919274A EP98919274A EP0977920A1 EP 0977920 A1 EP0977920 A1 EP 0977920A1 EP 98919274 A EP98919274 A EP 98919274A EP 98919274 A EP98919274 A EP 98919274A EP 0977920 A1 EP0977920 A1 EP 0977920A1
Authority
EP
European Patent Office
Prior art keywords
web
nozzle
layer
coating color
application
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Withdrawn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
EP98919274A
Other languages
German (de)
English (en)
Inventor
Reinhard Knop
Ingo Becker
Hermann Thul
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.)
Voith Patent GmbH
Original Assignee
Jagenberg Papiertechnik 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 Jagenberg Papiertechnik GmbH filed Critical Jagenberg Papiertechnik GmbH
Publication of EP0977920A1 publication Critical patent/EP0977920A1/fr
Withdrawn legal-status Critical Current

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
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters

Definitions

  • the coating colors contain as
  • Pigments chalk, calcium carbonate etc., additives such as CMC, starch and auxiliary agents are also added.
  • coating color is applied in excess by means of an application system, which is then doctored down to the desired coat weight by a metering system.
  • Applicator rollers, applicator units and free jet nozzles are known as application systems.
  • the metering systems contain mechanical doctor elements, such as doctor blades, doctor rods etc. or so-called air knives as metering elements, which scrape off the excess by means of an air jet from a nozzle.
  • Air knives are used in particular to coat cardboard in order to receive an order (contour line) following the cardboard surface. They can only be operated up to web speeds of approx. 400 m / min, while coating devices with mechanical doctor elements achieve coating speeds of more than 1000 m / min when coating paper webs several meters wide.
  • a disadvantage of the known coating processes is that a very large excess of coating color has to be applied, which is then removed again.
  • the great Excess causes water with color to penetrate the absorbent paper or cardboard web.
  • the invention has for its object to provide a method and an apparatus for applying pigment coating colors on paper or cardboard webs, which enables an application without excess and thus both avoids the burden of a subsequent metering element and the application of very small quantities enables.
  • Another advantage is that a contour line can be applied at high production speeds of more than 500 m / min.
  • the method according to the invention can be carried out with a higher moisture content of the paper or cardboard web and, at the same time, the risk of web tears is reduced due to the gentler treatment of the paper, it is possible to arrange the coating device further ahead in the on-line coating within the paper machine and so saving dryer capacity.
  • a device according to the invention can also be operated just as advantageously on-line at the known locations and off-line, that is to say separately from the paper machine.
  • a curtain is formed with sufficient uniformity, which causes a uniform application on the web.
  • according to claim 1 5 is either Slot nozzle or a web guide element arranged below the slot nozzle is adjustable in height.
  • the ventilation in a circuit separate from the application according to claim 5 with the device according to claim 34 makes it possible to control the feed quantity into the slot nozzle for adjusting the application quantity unaffected by the ventilation.
  • a moisture content of the paper web of more than 4 wt .-%, preferably 6 to 10 wt .-%, according to claim 6 improves the wettability and adhesiveness of the web.
  • the coating color is thus anchored to the web. The same is done in a primer by the moisture content according to claim 1 1.
  • the paper or cardboard web is pre-smoothed before application, in order, for. B. to coat paper with the quality required for gravure printing.
  • the required smoothness of the paper can, for. B. by pretreatment in a calender or a calender or by applying a primer according to the method of claim 9.
  • the paper quality can be further improved if, after the application of the second layer in a free-falling curtain, a third layer is applied as a top layer and metered with a doctor element (preferably a doctor knife). It is also advantageous for different paper qualities to apply a second primer (claim 13). Depending on the coating color used, the amount applied and the required paper quality, intermediate drying is carried out between two coating stages or the coating is carried out wet-on-wet, that is to say without intermediate drying. In special cases it can be advantageous to To apply coating color in a free-falling curtain in excess, and then metering or smoothing with a doctor element (claim 8).
  • the support of the web in the area of the support nozzle according to claim 1 6 ensures a very smooth path and thus prevents order fluctuations when the curtain impacts the web.
  • the arrangement of a deflecting roller in the area of the slot nozzle according to claim 1 7 provides the advantageous support on the one hand, on the other hand the web can then be inclined downwards to improve the impact behavior of the coating color on the web.
  • the embodiment according to claim 18 makes it possible to move the slot nozzle into an area outside the course of the web and to have the curtain formed there.
  • the slot nozzle When a uniform curtain has formed, the slot nozzle is moved back into the web area and the curtain comes into contact with the web.
  • the slot nozzle remains in its working position.
  • a trough is moved between the nozzle and the web, from which the coating color is taken up.
  • the trough is preferably moved away from the area of the curtain in the direction of web travel. So that the curtain is released from the tub without any annoying side effects, blow nozzles are arranged on the side of the nozzle opposite the tub, which blow in the direction of the extension movement and thus bend the lower part of the curtain towards the tub.
  • the curtain is bent immediately above the web in a direction that supports the desired impact behavior.
  • a scraper is arranged behind the slot nozzle behind the slot nozzle and can be moved and extends transversely across the working width.
  • a slot nozzle with a locally differently adjustable outlet gap over the working width makes it possible to influence the cross profile of the job, e.g. B. to compensate for profile fluctuations in the paper or cardboard web.
  • the device according to claim 24 contains elements for sucking off coating color behind the slot nozzle, with which the coating color applied at the web edges can be removed again.
  • Axis rotatable disks are preferably used, which take up the coating color at the edges and convey it outside the web area, where it is scraped off the belt or disk by scrapers or similar elements.
  • the impact angle of the curtain on the web can be changed either by changing the course of the web by means of height-adjustable web guide elements and / or by means of a nozzle which is displaceably mounted in and against the web running direction above a curved web path.
  • the impact angle influences the transition of the coating color from the curtain to the web. It can be optimized for different coating colors or web materials.
  • a scraper placed on the top of the web at a short distance (maximum 200 mm) in front of the nozzle reduces the air boundary layer on the web.
  • the transition of the coating color to the web is facilitated.
  • Higher production speeds can be achieved (claim 28).
  • Guide plates are preferably used as guide elements, which are inclined inwards towards the center of the web.
  • the claims 30 to 32 contain preferred, since particularly advantageous systems with an application device according to the invention for the production of different paper or cardboard qualities.
  • Claim 33 contains a system in which the application device and the subsequent dryer are arranged in a particularly clever manner relative to one another. In this system, the heat influence of the dryer on the application device is particularly low. The system parts are arranged in a very space-saving manner and existing systems can simply be upgraded to this form.
  • Figure 1 shows the side view of an order according to the invention.
  • Figure 2 shows schematically the arrangement of the nozzle in order to adjust the drop height and / or the impact angle.
  • Figure 3 shows a device in which a metering system is arranged after the nozzle.
  • FIG. 4 shows a side view of a device in which a trough is moved between the nozzle and the web for starting.
  • FIG. 5 shows a top view of a device in which the web edges are covered by tapes.
  • FIG. 6 shows a side view of the device according to FIG. 5.
  • FIG. 7 shows a device with rotating disks at the edges in order to keep them free.
  • Figure 8 shows a device with a scraper to reduce the air boundary layer on the web.
  • Figure 9 shows schematically a coating system with a device according to the invention for applying the top coat.
  • Figure 1 0 shows schematically the system diagram of a three-stage coating system, in which the second top coat is applied by means of a device according to the invention.
  • Figure 1 1 shows the system diagram of the ventilation of the coating color.
  • the device shown in FIG. 1 is used to apply a water-based pigment coating ink to a paper web 1. It has a frame in which a deflection roller 2 is mounted at a certain height, from which the web 1 fed below is deflected into a horizontal (as shown in FIG. 1) or inclined downward slope. In the area above the deflection roller 2 and thus above the web 1, a slot nozzle 3 extending transversely to the web running direction is suspended in the frame. The slot nozzle 3 is connected to a feed for coating color, not shown, and has on its underside a slot-shaped outlet gap from which the coating color emerges and forms a free-falling curtain that falls as far as the web surface.
  • the width of the outlet gap of the nozzle 3 is preferably larger than the width of the web 1.
  • the slot nozzle 3 is adjustable in height suspended between two vertical profiles 4 in order to be able to adjust the distance of the outlet gap from the web 1 and thus the drop height of the coating color.
  • a drop height between 20 mm and 500 mm is preferably set.
  • the stands 4 with the slot nozzle 3 are horizontally moveable in and against the web running direction in two lateral rails 5 which are counter to the web running direction (to the left in FIG. 1) extend into an area in front of the deflection roller 2.
  • the slot nozzle 3 can thus be moved into the area in front of the line of the deflection roller 2. Your exit gap is then above a collecting trough 6, which is arranged directly in front of the deflection roller 2.
  • an element for suctioning off coating color is arranged behind the slot nozzle 5 in its working position shown in FIG. 1 in the region of the web support element (rollers 7, 8, 9) in each edge region of the web 1.
  • the web 1 is guided to a further support roller 1 1, which serves as a counter roller for a scraper 1 2 movable against the top of the web 1 and away from it.
  • the scraper 1 2 extends across the width of the web. It is attached to a pivotally mounted holder 1 3 which extends over the working width.
  • the holder 1 3 is mounted on each longitudinal side of the device in a support 14 attached to the frame of the device. The pivoting movement of the scraper 1 2 against the web 1 and away from it is effected by means of a piston-cylinder unit 37 which is fastened on the one hand to the support 14 and on the other hand to the holder 13.
  • a suction device is arranged in front of him in the direction of web travel.
  • the suction device is preferably also suspended from the supports 14 and contains a rear storage wall 15 which is connected to the Scraper 1 2 forms a suction chamber open against web 1, from which the excess coating color is sucked off.
  • the device shown in Figure 1 is used to apply only one layer to a paper or cardboard web. It is particularly advantageous to apply a stroke to a cardboard web.
  • Figure 2 shows schematically the preferred embodiment, in which the web 1 in the area of the slot nozzle 3 is fed to a deflection roller 2 from below and deflected by the latter so that the web 1 behind the deflection roller 2 is inclined downwards.
  • the slot nozzle 3 is vertically movable to adjust the drop height.
  • the deflection roller 2 is mounted as a web guide element so that it can be moved horizontally.
  • the deflection roller 2 is followed by an air turn 1 6 deflecting the web without contact, which is mounted in the frame of the device so that it can be adjusted in height, in order either to change the path or to be able to adapt a changed path.
  • the ability of the slot nozzle 3 to move against the web running direction into an area in front of the deflection roller 2 serves to form a uniform curtain outside the web when the device is started, which curtain is then brought into contact with the web 1. While the curtain is forming, the coating color falls into the tub 6 in the embodiment according to FIG. 1.
  • FIG. 4 shows a further embodiment of the invention, in which a trough 6 is moved between the nozzle 3 and the web 1 during the formation of the curtain.
  • the trough 6 can be moved in or - as shown in FIG. 4 - preferably against the web running direction under the nozzle 3.
  • blowing nozzles 17 are arranged on the side of the curtain opposite the tub 6, which blow in the direction of the extension movement.
  • the lower part of the curtain is curved towards the tub 6.
  • the nozzles 17 preferably blow in the web running direction, see above that the curtain is curved immediately above the web 1 in a direction that supports the desired impact behavior.
  • FIGS. 5 to 7 show various options for keeping the web edges free of coating color from the outset:
  • a circumferential band 18 is arranged in the region of each web edge, the upper run of which runs parallel to the web 1 between the nozzle 3 and the web 1 and thus covers the web edges. In order that the coating color falling on the strips 18 is transported to the outside, the strips 18 are in
  • the web edges are kept clear by means of disks 20 arranged essentially horizontally and rotatable about an essentially vertical axis.
  • the disks 20 are arranged between the nozzle 3 and the web 1 and each turn outward behind the nozzle 3, so that the ink picked up is conveyed away from the web 1.
  • scrapers 19 are arranged on the disks, from which the absorbed paint is scraped off.
  • a device is shown in FIG. 8, in which a scraper 21, which rests on the upper side of the web 1 and which reduces the air boundary layer on the web 1, is arranged at a maximum distance of 200 mm in front of the nozzle 3. If - as shown in FIG. 8 - the web in the region of the nozzle 3 is deflected by a deflecting roller 2, the scraper 21 can be arranged directly in front of the nozzle 3 and bear against the counter roller 2 under pressure in order to work particularly effectively.
  • FIG. 9 shows the basic diagram of a system for applying two layers on a paper or cardboard web, in which the first layer is applied using a known application system and the second layer using an apparatus according to the invention:
  • the web is guided by a roll-off device, not shown, to an application system 22 which, for. B. contains an applicator roller, an applicator nozzle or a free jet nozzle for applying coating color in excess.
  • the application system 22 and a subsequent metering system 23 are arranged in the wrapping area of a counter roller 24, by which the web 1 is supported during application and metering.
  • the metering system 23 contains as a metering element a doctor knife, a doctor bar or a metering bar, from which the excess application is scraped off again to the desired coating weight.
  • the web 1 is smoothed to a roughness value according to PPS of less than 3, preferably less than 2.
  • the application is preferably carried out by means of the nozzle 3 onto a web 1 pre-smoothed to these values.
  • the application and metering system 22, 23 is followed by one or more dryers 25, of which the first layer is dried.
  • the web 1 is guided from the dryers 25 to a second applicator unit 26, from which a second layer is applied to the web 1 in a free-falling curtain.
  • the second application device is constructed in accordance with the exemplary embodiments described in FIGS. 1 to 8.
  • the web is guided obliquely downwards to the air turn 16, which deflects it upward without contact to a dryer 27, which is fastened above the second application device 26 in the frame.
  • a coating color with a solids content of 30% by weight to 72% by weight is initially applied in excess to the web 1 by the application system 22.
  • the excess is scraped off by the subsequent metering system 23 to a dry coat weight of 3 to 15 g / m 2 , preferably 5 to 12 g / m 2 .
  • the web 1 is either intermediate dried or fed to the second application device 26 for wet-on-wet application without intermediate drying.
  • the dry content of the first layer is preferably set to a value between 50% and 90%, in particular between 70% and 80%.
  • the second layer is then applied in a free-falling curtain.
  • the dry application of the coating color of the second layer is 3 g / m 2 to 30 g / m 2 , preferably 8 g / m 2 to 20 g / m 2 .
  • the layer of pigment coating ink applied with the second application device 26 is then dried.
  • the total amount of coating color applied - measured dry - is preferably 20 to 35 g / m.
  • a second pre-coat can be applied in a free-falling curtain using a conventional application and metering system before applying the top layer.
  • the second primer is applied either wet-on-wet or after intermediate drying on the first primer.
  • intermediate drying or the top coat is applied wet-on-wet to the second precoat.
  • FIG. 10 shows a system diagram in which three layers are also applied in succession to the web 1.
  • the last application (top coat) is applied with a conventional application and metering system 28, which preferably contains a doctor knife 29 as a metering element.
  • the "first application device which is also conventional as an application and
  • Dosing system 22, 23 is designed with a doctor element, serves to preload the web 1 first. Subsequently, a second undercoat is applied in a free-falling curtain before an overcoat is applied in excess and dosed with a scraper knife 29 to achieve the greatest possible smoothness.
  • This system can also be used for drying between the individual coating stages, or it can be applied wet-on-wet.
  • the solids content of the coating color, the application quantities and the moisture content of the web 1 correspond to the values listed in the exemplary embodiment under FIG. 2.
  • FIGS. 9 and 10 are particularly suitable for coating cardboard with a weight per unit area of more than 120 g / m 2 .
  • the application in a free-falling curtain makes it possible to reliably cover very rough surfaces with small amounts of coating color, without leaving uncovered areas.
  • the application with a slot nozzle 3 in a free-falling curtain offers the great advantage of applying the coating color exactly in the desired application quantity, ie not in excess.
  • the combination of a slot nozzle with a subsequent metering system is shown schematically in FIG. 3:
  • the paper or cardboard web 1 to be coated is fed from above to a counter roller 30 in front of its apex line.
  • a deflection roller 31 arranged on the feed side next to the apex line guides the web 1 tangentially to the mating roller 30.
  • the excess coated web 1 is deflected by the counter roller 30 by more than 180 °.
  • a metering system 32 is arranged, which abrades the excess to the desired coat weight.
  • a scraper knife 33 is preferably used as the metering element.
  • Figure 1 1 is a schematic of the device for venting the coating color before
  • the coating color is fed to the nozzle 3 from a storage container 34, the amount supplied to the nozzle 3 being controlled by a metering pump 35. If necessary, the coating color is filtered on its way to the nozzle 3 by means of a filter 36. To remove air bubbles from the coating color, the reservoir 34 is connected to a self-contained ventilation circuit which is independent of the feed line to the slot nozzle 3. This makes it possible to control the feed quantity into the slot nozzle 3, on which the discharge quantity of the nozzle 3 and thus the application quantity on the web 1, by means of the metering pump 35 unaffected by the ventilation.
  • a portion of the coating color is permanently drawn off from the storage container 34 by means of a pump 37 and fed to a ventilation container 38.
  • the ventilation tank 38 is connected to a vacuum pump via a line 39. If necessary, is in the return line 40 from the Venting device in the reservoir 34, a pre-filter 41 is arranged. New coating color is fed into the reservoir 34 by means of a feed line 42.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant d'appliquer un bain de couchage au pigment sur une bande de papier ou de carton (1). Le bain de couchage à teneur en solides comprise entre 30 et 72 % en poids, de préférence entre 45 et 70 % en poids, est appliqué sur la bande à l'aide d'une filière à fente (3) disposée de manière à s'étendre transversalement au sens de la bande, dans un rideau à chute libre.
EP98919274A 1997-04-21 1998-04-16 Procede et dispositif pour appliquer un bain de couchage au pigment sur une bande de papier ou de carton Withdrawn EP0977920A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1997116647 DE19716647A1 (de) 1997-04-21 1997-04-21 Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
DE19716647 1997-04-21
PCT/EP1998/002229 WO1998048113A1 (fr) 1997-04-21 1998-04-16 Procede et dispositif pour appliquer un bain de couchage au pigment sur une bande de papier ou de carton

Publications (1)

Publication Number Publication Date
EP0977920A1 true EP0977920A1 (fr) 2000-02-09

Family

ID=7827179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98919274A Withdrawn EP0977920A1 (fr) 1997-04-21 1998-04-16 Procede et dispositif pour appliquer un bain de couchage au pigment sur une bande de papier ou de carton

Country Status (3)

Country Link
EP (1) EP0977920A1 (fr)
DE (1) DE19716647A1 (fr)
WO (1) WO1998048113A1 (fr)

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Also Published As

Publication number Publication date
DE19716647A1 (de) 1998-10-22
WO1998048113A1 (fr) 1998-10-29

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