EP3737794A1 - Auftragsverfahren und vorrichtung - Google Patents
Auftragsverfahren und vorrichtungInfo
- Publication number
- EP3737794A1 EP3737794A1 EP18803937.4A EP18803937A EP3737794A1 EP 3737794 A1 EP3737794 A1 EP 3737794A1 EP 18803937 A EP18803937 A EP 18803937A EP 3737794 A1 EP3737794 A1 EP 3737794A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- auxiliary belt
- application medium
- material web
- deflection
- auxiliary
- 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
- D21H23/50—Spraying or projecting
Definitions
- the invention relates to a method for applying a liquid or pasty application medium to a moving material web, in particular a continuous fibrous web according to the preamble of claim 1 and a device for applying a coating medium according to the preamble of claim 10.
- the coating of material webs, in particular paper webs, with a liquid or pasty application medium is a technique for which a large number of solutions are known from the prior art.
- WO 2012/072873 describes a method in which a starch solution is sprayed directly onto the material web by means of nozzles. It is advantageous that the mechanical stress of the web by coating is low, since no web-contacting components are used.
- High outflow speeds, and thus high impact speeds of the application medium are advantageous in order to achieve the best possible and rapid penetration into the material web, even if the material web is moved at high speed.
- a possible alternative may be to spray the application medium not directly on the web, but indirectly via an auxiliary medium.
- a method is presented in which the application medium is sprayed onto a roller, and then transferred to the material web in a nip. From W02005 085 525 the variant is also known to apply the application medium on a tape and transferred from there by means of a nip or a comparable treatment zone on the web.
- Another object of the invention is to provide an application method which has a wide range of applications, and is particularly suitable for the application of small amounts of application medium, as well as for the order on high-speed material webs.
- the object is achieved by a method for applying a liquid or pasty application medium on a moving material web, in particular a moving fibrous web, wherein the application medium is applied by means of a predosing on a first moving auxiliary belt and this first auxiliary belt at least a first deflection his Movement direction changes. It is provided that the first auxiliary belt moves at approximately the same or higher speed than the moving material web, wherein the first auxiliary belt is not in contact with the material web, and that the
- Application medium is transferred at least partially at the first deflection of the first auxiliary belt in the form of a beam on the moving fibrous web
- beam which is used for transferring the application medium from the first auxiliary belt to the fibrous web
- the term beam is to be interpreted very broad in the context of this application , It is intended to describe that the application medium moves freely over a certain range, that is to say in particular without walls and without being moved by a band in the direction of the material web.
- the term should in particular also include that the application medium moves as a closed film or in the form of individual drops in the direction of the fibrous web.
- a running material web can preferably be provided a fibrous web, especially a paper, cardboard, tissue or pulp web.
- a fibrous web especially a paper, cardboard, tissue or pulp web.
- the method is not limited to this. It may also be advantageous for the coating of other webs, e.g. Textile webs, nonwoven webs or the like.
- the application medium is predosed on a first auxiliary belt.
- this predosing it is not necessary that the application medium is applied to the auxiliary web at high speed. Therefore, this can be selected for a simple pre-metering, in which the from the state oftechnik known risk of contamination of the nozzles is not, or occurs only to a lesser extent.
- Suitable pre-metering devices may be: overflow casters, slot dies, conventional single-fluid nozzles or the like.
- the application medium is accelerated to its speed by applying to the first auxiliary belt. It is provided that the auxiliary belt moves at approximately the same or higher speed than the moving material web. By “approximately equal speed” is meant in this context that the speed of the first auxiliary belt can be equal to the speed of the material web, or optionally also up to 25% or even 50% slower.
- a first deflection which may be, for example, a deflection roller, but also to another conventional deflection
- the direction of movement of the first auxiliary belt is changed quite abruptly, and the application medium from the first auxiliary belt as it were thrown away and in the form of a beam on the transfer ongoing fibrous web.
- no contact of the material web with the first auxiliary belt takes place. Therefore, neither the surface quality of the coated material web is impaired, nor is there any other mechanical stress on the material web.
- first deflection should not imply that this is the first deflection device of the auxiliary belt after application of the application medium. Although this may certainly be advantageous, but also further deflections between the predosing of the application medium and the first deflection, as well as behind the first deflection may be provided.
- second deflection described later, the analog applies. By throwing away the application medium, this receives an impulse towards the material web. The impact speed can easily be controlled by the speed of the first auxiliary belt. If a higher impact speed is needed for a fast penetration, this can be achieved by increasing the speed of the first auxiliary belt.
- a simple maintenance for example in the form of a cleaning of the auxiliary belt is possible. This can be done during operation, in contrast to the spray nozzles known from the prior art. Further advantageous embodiments are described in the subclaims.
- a second auxiliary band may be provided, which changes its direction on at least one second deflection and the application medium is transported at least in sections between the first auxiliary band and the second auxiliary band.
- the first auxiliary belt and / or the second auxiliary belt in the form of endless belt loops are present and supported by further deflections designed as a rotating auxiliary belt is / are.
- Beam speed can be done at the deflection.
- the ratio of the belt speeds and the angle between the belts the atomization and impact velocity of the liquid to be applied can be controlled.
- first and the second auxiliary belt together with the application medium a roller nip consisting of a first guide roller and a second guide roller, pass, wherein the first guide roller is the first deflection of the first auxiliary belt, and the second deflection roller a second deflection of the second
- roller nip forms a defined point at which the application medium leaves the auxiliary belt.
- the application medium is applied by the jet to the entire width of the fibrous web or at least 90% of the width of the fibrous web.
- the method for fast material webs is very advantageous when, for example, the moving material web moves at a speed of 200 m / min or more, in particular at a speed of between 400 m / min and 2000 m / min. While in many applications, the speed of the fibrous web is between 1000 m / min and 1400 m / min, but also extremely high speeds such as 3000 m / min are conceivable. Furthermore, it can be provided that between 5 ml / m 2 and 100 ml / m 2, in particular between 10 m 2 and 50 ml m 2 are applied to application medium to the fibrous web / ml /.
- the advantage of the method over the prior art is particularly large.
- it can also be used advantageously for larger application quantities, for example up to, for example, 100 ml / m 2 or more.
- One of the advantages of the present invention is that, by varying the speed of the first fleece band, the jet speed, and thus the impact speed of the application medium, can be easily adapted to the material web.
- first auxiliary belt and / or the second auxiliary belt at a speed of more than 600 m / min, in particular between 2000 m / min and 10000m / min, more preferably between 3000 m / min and 6000 m / min moves.
- speed can also higher speeds are advantageous, for example in the range of 20,000 m / min or 40,000 m / min).
- first and the second auxiliary belt move at the same speed, or that their speeds differ.
- the second auxiliary band can be operated both faster and slower than the first auxiliary band.
- the direction of movement of the moving material web is vertical or has a component in the vertical direction, while the direction of the jet is horizontal or has components in the horizontal direction.
- the first auxiliary belt runs horizontally in the region between the pre-metering and the first deflection or has a component in the horizontal direction.
- the relationship between the orientation of the material web and the beam can be advantageously adjusted so that the beam impinges perpendicular to the fibrous web, or at an angle which deviates from the vertical by a maximum of 45 °. This is particularly advantageous because the penetration of the
- Application medium in the web is particularly well supported.
- the application medium may be a starch solution or a pigmented coating color.
- a liquid, in particular water is also possible to use as application medium.
- the density of the application medium is meant to the environmental conditions to which it is pre-dosed.
- the application medium can, as mentioned above, solids, for example in the form of pigments such as CaC0 3 or Ti0 2 included.
- solids contents above 50% by weight are rather rare. Preference is given to using solids contents of between 1% by weight and 30% by weight.
- the viscosity of the application medium can advantageously be in the range between 0.10 mPas and 200 mPas.
- the viscosity is particularly preferably between 10 mPas and 100 mPas. Unless otherwise stated, the viscosity information in this application always means the Brookfield viscosity, measured at 100 rpm and 55 ° C.
- the thickness of the beam may advantageously be between 1 pm and 200 pm, preferably between 1 pm and 100 pm or 140 pm.
- the resulting from the impact of the beam on the web ram pressure is usually below 300 bar. In advantageous embodiments, this back pressure between 8bar and 150 bar lie. In particular, at high back pressures, it may be advantageous if, as described below, a support member is provided to fix the position of the material web to the line of incidence of the beam.
- the object is achieved by a device for applying a coating medium on a moving material web, in particular a moving fibrous web, wherein the device comprises a first moving auxiliary belt and a first deflection at which the first auxiliary belt changes direction and a pre-metering device for applying the application medium on the first auxiliary belt and wherein the first auxiliary belt is not in contact with the material web.
- the first auxiliary band, the deflection, and the pre-metering device are arranged so that the device is suitable for carrying out a method according to one of the preceding claims.
- Advantageous embodiments are described in the subclaims.
- the device comprises a second auxiliary belt and a second deflection, which changes the direction of the second auxiliary belt, wherein the first and the second auxiliary belt are arranged so that the application medium at least in sections between the first auxiliary belt and the second auxiliary belt can be transported.
- the two auxiliary bands extend at least in sections in parallel.
- the width of the first auxiliary band and / or the second auxiliary band may be between 80% and 120%, in particular between 95% and 105% of the width of the material web. This is particularly advantageous if the material web is to be coated over its entire width, or at least over substantial parts thereof in one step.
- the surface of the first auxiliary band and / or the second auxiliary band comprises or consists of a metal or a polymer, in particular a polyurethane.
- one or both auxiliary bands may be a metal band.
- one or both auxiliary bands may comprise a basic structure - e.g. a fabric or scrim having a coating of a polymer such as e.g. a polyurethane is provided.
- one or both auxiliary bands may be a felt which comprises at least one layer of staple fibers.
- the surface of the first auxiliary band and / or the second auxiliary band is smooth or has a structure.
- the device comprises a diaphragm, in particular an adjustable diaphragm. It can be a slit diaphragm. This diaphragm can advantageously be arranged between the first deflection and the material web such that during operation of the device the jet of application medium can at least partially pass through the diaphragm. Such a diaphragm makes it easier to set a defined impact area of the beam on the material web as well as a defined jet thickness when hitting the material web.
- the device comprises an enclosure which surrounds at least the predosing device, the first deflection and at least parts of the first auxiliary band.
- the housing has at least one opening, in particular in the form of a diaphragm, which during operation of the device can at least partially pass through the jet of application medium.
- This enclosure is advantageous, among other things, because it pollution of the environment is avoided by any splashes of application medium.
- the elements inside the enclosure are shielded from the environment. Since it can occur that the first auxiliary belt and / or the second auxiliary belt rotate very quickly in the case of corresponding applications, such an enclosure is also advantageous for safety-related reasons, in order to avoid a risk of injury to the operating personnel.
- Such an enclosure can be made of metal or plastic, for example. It may also be very advantageous if the enclosure is at least partially transparent, so that monitoring from the outside is possible without having to open the enclosure. Furthermore, it may be advantageous if means are provided to clean the first auxiliary belt and / or the second auxiliary belt during operation of the device. These may be, for example, scrapers that scrape off any residues of application medium from the respective tape. Alternatively or additionally, cleaning nozzles may also be provided in order to apply a cleaning fluid, in particular water, to the respective band Finally, it may also be very advantageous if a support element is provided, which is arranged on the uncoated side of the material web in the impingement region of the beam. Such a support element can touch the material web, such as a support roller or a support plate. However, such a support element can also be designed so that the material web, similar to a pneumatic table, slides on an air cushion.
- Figure 1 shows schematically a device according to one aspect of the invention
- Figure 2 shows schematically a device according to another aspect of the invention.
- FIG. 3 schematically shows conditions when the application medium is applied
- Figure 4 shows estimates for relationships between viscosity and pressure for 100% penetration
- Figure 5 shows estimates for relationships between viscosity and jet velocity for 100% penetration.
- 1 shows a device 1 for applying a coating medium 4 to a moving material web 2, such as a paper web 2 or board web 2.
- the fibrous web 2 runs in this example vertically from top to bottom at a speed which is usually between 400 m / min and 2000 m / min, for example, 1000m / min.
- the application device 1 comprises a circumferential first auxiliary belt 10. This extends between a further deflection 12 and the first deflection 11 horizontally, or at least approximately horizontally. In this horizontal region, a coating medium 4 is applied to the first auxiliary strip 10 by means of a predosing device 3, for example in the form of a starch solution 4.
- the pre-metering device can be, for example, a slot nozzle 3 or an overflow caster.
- the application medium 4 is transported by the first auxiliary belt 10 in the direction of the material web 2.
- the Speed of the first auxiliary belt 10 is greater than that of the material web 4, for example between 3000 m / min and 6000 m / min.
- the device 1 of FIG. 1 also comprises a second circulating auxiliary belt 20.
- a second circulating auxiliary belt 20 runs between a further deflection 22 and the first deflection 21 horizontally, or at least approximately horizontally, and is arranged so that in this area the application medium 4 is guided between the first auxiliary belt 10 and the second auxiliary belt 20 in the sandwich.
- the invention is not limited thereto.
- on the second auxiliary belt 20, and the associated deflections 21, 22 are omitted.
- a support element 5 is provided on the back of the material web 2. It is located at the point of impact of the beam, and may extend a few centimeters before and after the point of impact.
- the support element extends in the running direction of the material web - at least 5 cm, in particular at least 10 cm before and / or behind the point of impact of the beam.
- these means 6 may also be provided for the second auxiliary belt 20.
- a possible embodiment may be a scraper 6, which may be applied in particular in the region of a deflection 12 to the auxiliary belt 10, 20.
- the apparatus shown in FIG. 1 also comprises an enclosure 8. 8a.
- This encloses the pre-metering device 3 and the first and second auxiliary belt 10, 20 with the associated deflections 11, 12, 21, 22 and the scraper 6 for cleaning the auxiliary belt 10, 20th
- the housing 8, 8a in this case has at least one opening 7, in particular in the form of a diaphragm 7, which during operation of the device 1, the jet of application medium 4 can at least partially pass.
- This enclosure 8, 8a is advantageous, inter alia, because it prevents contamination of the environment by possible splashes of application medium 4.
- the elements inside the enclosure 8, 8a are shielded from the environment.
- the enclosure in Figure 1 is designed so that it has at least one transparent part 8a. Thus, external monitoring is possible without having to open the enclosure 8, 8a.
- a collecting device 9 is provided to absorb excess application medium 4 or by spraying or setting the aperture 7 in the housing 8, 8a remaining application medium 4 and make further processing accessible.
- the enclosure e.g. by a slight inclination of the floor or similar be configured so that the application medium 4 converges at one point and can be removed there centrally into the collecting device.
- FIG. 2 shows by way of example an alternative embodiment of the device 1.
- an enclosure 8, 8a was dispensed with.
- There is only one aperture 7 is provided.
- this can be made so large that it prevents undesirable splashes of application medium 4 on the material web 2.
- the collecting device 9 it may be advantageous if the collecting device 9 extends over the entire length of the device 1, or at least completely covers the area under the belt loop of the first auxiliary belt 10.
- FIG. 2 shows that the first auxiliary band 10 and the second auxiliary band 20 do not necessarily have to run horizontally.
- the inclination of the band in the region of the predosing device 3 can, for example, be in the range of up to 45 °.
- the beam also does not impinge perpendicularly on the material web. However, it has proven to be advantageous if this angle of the vertical deviates by a maximum of 45 °.
- Figure 2 also shows that you in choosing the predosing
- FIG. 3 schematically shows the conditions when a jet of application medium 4 impinges on a moving material web 2.
- the application medium 4 or the liquid contained therein is also pressed into pores of the passing material web 2 by the high impact velocity V_S and the high dynamic pressure.
- the application quantity to the material web 2 can be controlled via the flow rate of the predosing device 3.
- the penetration depth D can be regulated by the speed of the auxiliary belt 10, 20.
- the penetration depth D of the liquid into the material web 2 depends, inter alia, on the jet width, the jet velocity V_S, and the viscosity of the application medium
- Nippressung of about 12 bar is necessary (Nip Museum 32 mm).
- significantly higher jet pressures are required, as can be seen from FIG.
- the required jet pressure for the complete penetration increases disproportionately.
- the required jet velocity V_S was derived from the required jet pressure and shown in Figure 4 for the selected settings. (This example was calculated in the case of starch application).
- the determined spray jet velocity V_S in [m / min] is plotted from the values of FIG. It can be seen that high spray jet velocities V_S compared to the substrate speed of 1000 m / min are necessary to obtain the full film penetration.
- the determined jet speed, and thus also the necessary speed of the first 10 and the second auxiliary belt 20 is well above the speed of the material web 2 of 1000 m / min.
- the spray jet velocity V_S also increases disproportionately when the average pore diameter becomes ⁇ 10 ⁇ m (not shown) and when the application quantity increases. A higher viscosity also leads to an increase in the required spray rate V_S. It can be seen in particular from FIGS. 4 and 5 that with the proposed application method and the presented device 1 it is possible to produce very thin liquid jets at high speed V_S.
- first auxiliary band 1 1 first deflection 12 further deflection 20 second auxiliary band
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Seal Device For Vehicle (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018100489.3A DE102018100489A1 (de) | 2018-01-11 | 2018-01-11 | Auftragsverfahren und Vorrichtung |
| PCT/EP2018/081149 WO2019137663A1 (de) | 2018-01-11 | 2018-11-14 | Auftragsverfahren und vorrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3737794A1 true EP3737794A1 (de) | 2020-11-18 |
| EP3737794B1 EP3737794B1 (de) | 2023-03-08 |
Family
ID=64332049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18803937.4A Active EP3737794B1 (de) | 2018-01-11 | 2018-11-14 | Auftragsverfahren und vorrichtung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3737794B1 (de) |
| DE (1) | DE102018100489A1 (de) |
| FI (1) | FI3737794T3 (de) |
| WO (1) | WO2019137663A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB108340A (en) | 1916-07-27 | 1917-07-27 | John William Mackenzie | Manufacture of Paper. |
| DE4316008A1 (de) * | 1993-05-13 | 1994-11-17 | Domaga Fa | Verfahren und Vorrichtung zum Auftragen von Flüssigkeiten auf die Lederoberfläche oder ähnliche flache Materialien |
| EP0911447A3 (de) * | 1997-10-24 | 2001-08-16 | Voith Paper Patent GmbH | Vorrichtung und Verfahren zum Beschichten einer Materialbahn, insbesondere aus Papier oder Karton |
| DE19823723A1 (de) * | 1998-05-08 | 1999-11-11 | Voith Sulzer Papiertech Patent | Auftragsvorrichtung und -verfahren für eine Papier- oder Kartonbahn |
| DE10154283A1 (de) * | 2001-11-05 | 2003-05-15 | Voith Paper Patent Gmbh | Verfahren zum Auftragen eines Auftragsmediums auf eine laufende Materialbahn |
| FI117106B (fi) | 2004-03-09 | 2006-06-15 | Metso Paper Inc | Menetelmä ja laite aineen siirtämiseksi kuiturainaan |
| DE102004036276A1 (de) * | 2004-07-27 | 2006-02-16 | Voith Paper Patent Gmbh | Verfahren und Vorrichtung zum Aufbringen eines Auftragmediums in einer Maschine zur Herstellung einer Faserstoffbahn |
| DE102004037660A1 (de) * | 2004-08-03 | 2006-03-16 | Voith Paper Patent Gmbh | Verfahren zum Auftragen eines flüssigen oder pastösen Auftragsmediums auf eine laufende Papier- oder Kartonbahn und Papier- oder Kartonmaschine zur Durchführung des Verfahrens |
| FI121086B (fi) * | 2004-12-31 | 2010-06-30 | Metso Paper Inc | Menetelmä paperi- tai kartonkirainojen päällystämiseksi |
| FI124591B (fi) | 2010-12-01 | 2014-10-31 | Valmet Technologies Inc | Menetelmä ja laitteisto paperin tai kartongin valmistamiseksi |
| EP3219849A1 (de) | 2016-03-15 | 2017-09-20 | Valmet Technologies Oy | Vorrichtung zur behandlung eines fasernetzes |
-
2018
- 2018-01-11 DE DE102018100489.3A patent/DE102018100489A1/de not_active Withdrawn
- 2018-11-14 FI FIEP18803937.4T patent/FI3737794T3/fi active
- 2018-11-14 WO PCT/EP2018/081149 patent/WO2019137663A1/de not_active Ceased
- 2018-11-14 EP EP18803937.4A patent/EP3737794B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3737794B1 (de) | 2023-03-08 |
| DE102018100489A1 (de) | 2019-07-11 |
| WO2019137663A1 (de) | 2019-07-18 |
| FI3737794T3 (fi) | 2023-05-29 |
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