EP0277159A1 - Device for applying a flowing fluid on webs of material. - Google Patents
Device for applying a flowing fluid on webs of material.Info
- Publication number
- EP0277159A1 EP0277159A1 EP87904838A EP87904838A EP0277159A1 EP 0277159 A1 EP0277159 A1 EP 0277159A1 EP 87904838 A EP87904838 A EP 87904838A EP 87904838 A EP87904838 A EP 87904838A EP 0277159 A1 EP0277159 A1 EP 0277159A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlets
- air
- wall parts
- web
- wall
- 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
- 239000000463 material Substances 0.000 title claims abstract description 9
- 239000012530 fluid Substances 0.000 title abstract description 3
- 238000001035 drying Methods 0.000 claims abstract description 5
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H23/00—Registering, tensioning, smoothing or guiding webs
- B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
- B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
- F26B13/101—Supporting materials without tension, e.g. on or between foraminous belts
- F26B13/104—Supporting materials without tension, e.g. on or between foraminous belts supported by fluid jets only; Fluid blowing arrangements for flotation dryers, e.g. coanda nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2406/00—Means using fluid
- B65H2406/10—Means using fluid made only for exhausting gaseous medium
- B65H2406/11—Means using fluid made only for exhausting gaseous medium producing fluidised bed
- B65H2406/112—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along preferably rectilinear path, e.g. nozzle bed for web
Definitions
- the invention relates to a device for
- Acting and suspending material webs in particular paper webs, with air or another flow medium, especially for drying the web.
- air or another flow medium especially for drying the web.
- the respective air outlet opening is as one nozzle slot extending across the width of the web (DE-C2 28 36 103).
- Such slots start from so-called nozzle boxes and are delimited on one side by an essentially flat wall and on the other side by a wall with a curved section and a subsequent straight section running parallel to the plane of the path.
- Known nozzle boxes with nozzle slots are usually made of sheet metal.
- the sheets tend to work and warp under the various operating conditions, in particular with changing temperatures and pressure conditions. This then also leads to undesirable changes in the area of the nozzle slot, so that the amount of air and possibly the conditions of the flow also change, which can be very disadvantageous depending on the extent of such influences.
- the object of the invention is to take existing difficulties and shortcomings into account and to create a device of the type mentioned which, with a simple design, enables the most stable working conditions possible even with changing temperature influences.
- the device should also be inexpensive to manufacture.
- the invention aims for an advantageous design of the device in detail. Further related problems with which the invention is concerned result from the respective explanation of the solution shown.
- the invention provides that in the nozzle area on both sides of a transverse plane standing in the longitudinal direction of the air duct and perpendicular to the plane of movement of the web in wall parts which delimit the air duct, there are individual outlets for air each opposite a guide surface for the air flow.
- the outlets can be designed as mouthpieces, individual nozzles or the like.
- holes are provided in the wall parts of the air duct as outlets for the air.
- the device according to the invention can be easily manufactured and enables perfect working even under different operating conditions. Even if
- a nozzle area of the design described can be present at one or more points on one and the same air duct, as seen in the longitudinal direction of the web.
- a favorable embodiment is characterized in that two wall parts provided with outlets are arranged directly opposite one another and each of these wall parts at least partially forms a guide surface for air streams emerging from the outlets of the other wall part.
- Such training enables particularly favorable conditions to be achieved in numerous cases.
- it serves to generate air flows according to the so-called Coanda effect.
- it can be advantageous to have the outlets in one wall! to be offset relative to the outlets in the other wall in particular in the side direction and / or in the vertical direction.
- Outlets for the air can be provided in curved wall surfaces or in flat wall parts, in particular those which are each at an acute angle to the transverse plane and merge into curved wall surfaces.
- the flat wall parts can be inclined at the same angle or else at different angles to the transverse plane. As a result, different requirements can be taken into account in a simple manner without requiring any special effort.
- the flat wall parts at an angle to one another can be formed by a coherent wall or else by merged and at the point of contact with one another, e.g. be formed by screwing, spot welding or in some other way connected wall parts.
- a particularly advantageous embodiment of the device is characterized in that guide surfaces are provided between the outlets located on both sides of the transverse plane in wall parts of the air duct and the air flows emerging from them in the direction of the plane of movement of the web.
- a fundamental feature of particular importance consists in the fact that at least one closure body extending in the longitudinal direction of the air duct is present in the base of the nozzle region of an air duct. This is not only particularly cheap in terms of production technology, but also offers numerous possibilities for influencing the flow conditions.
- guide surfaces are formed, in particular, on the side of the closing body facing the plane of movement of the web.
- guide surfaces are provided on opposite sides of a projecting part of the closure body. This allows air currents to be directed against the web in the sense of impact jets.
- the guide surfaces can be designed and arranged symmetrically or asymmetrically to the transverse plane. An inclination with respect to the transverse plane can also be provided for the guide surfaces.
- the closure body has roof-shaped guide surfaces. This includes advantageous for cases in which wall parts in the nozzle area are arranged opposite one another and air flows are directed from one side to the other.
- the position of the outlets relative to the closure body can be chosen depending on the circumstances. In many cases it is expedient to arrange outlets in the immediate vicinity of a boundary surface of the closing body.
- the closure body in question is advantageously mounted in the nozzle area, in particular between two wall parts of the air duct, in such a way that it can be easily replaced. It is then also easy to achieve a change in the operating conditions, for example if a web other than the one previously treated is to be passed through the device.
- Such interchangeable end bodies can then have guiding surfaces of various types.
- the closure body can also be composed of several parts. They are advantageously designed as ready-to-install units.
- 1 is a unit equipped with devices according to the invention for the continuous treatment of a material web
- FIG. 2 shows the point II in FIG. 1 on a larger scale in a perspective view
- 3 shows a nozzle area in a schematic representation
- 4 is a plan view of part of a nozzle area
- FIG. 5 shows another embodiment of a nozzle area in a cross section through an air duct
- FIG. 6 shows a further embodiment of a nozzle area in a section corresponding to FIG. 5,
- FIG. 7 is a perspective view of a closure body
- Fig. 8 shows an arrangement of air channels with nozzle areas for loading a material web
- Fig. 9 shows another arrangement of air channels with nozzle areas.
- the system shown in FIG. 1 is used, for example, to dry a paper web B which performs a linear movement in the direction of the arrow P and is thereby passed between an upper unit 1 and a lower unit 2.
- the devices for driving the web are not shown and can be designed in a known manner.
- air supply channels 9 are each arranged at a distance in the longitudinal direction of the web, so that between the individual channels 9 spaces 3 remain which are connected to the interior of unit 1, which is otherwise closed off by walls 4 . The same applies to the channels 9 of the lower unit 2.
- the channels 9 of the upper unit 1 are offset by half a division from the channels 9 of the lower unit 2, such that a nozzle area D on an upper channel 9 creates a space between two lower channels 9 is opposite and vice versa.
- the arrangement can also be made differently, for example, so that the channels 9 with the nozzle areas D and, accordingly, the spaces 3 are opposite each other.
- Air of the desired temperature and pressure passes through an inlet 5 in the direction of arrow F1 into a distributor housing 6 located inside the unit 1 and from there into branch housing 7, each of which is connected to the supply channels 9 through openings, not shown.
- a distributor housing 6 located inside the unit 1 and from there into branch housing 7, each of which is connected to the supply channels 9 through openings, not shown.
- the lower unit 2 After passing over the web B, the air emerging from the nozzle areas D passes through the spaces 3 into the interior of the unit 1 already mentioned, from which it exits through an outlet 8.
- Corresponding devices for supplying and discharging the air to and from the unit 1 can be implemented in a known manner.
- the arrow F2 indicates the exhaust air flow. In the lower unit 2, the same precautions are taken for the air flow as in unit 1.
- FIGS. 2 to 4 An advantageous embodiment of the nozzle area D is illustrated in FIGS. 2 to 4, with some modifications.
- a wall 10 belonging to the delimitation of an air supply duct 9 is shaped in such a way that wall regions standing at an acute angle to one another each merge into a curved section 12, to which flat sections 13 adjoin. These parts 12 and 13 can be addressed as a guide surface L for an air flow.
- the wall areas 10 are provided with air outlets in the form of punched holes 14, the outlets on one side being opposite those on the other side in the longitudinal direction of the nozzle area D, i.e. transversely to the web direction, are each offset from one another, as can be seen particularly in FIG. 4.
- the mutually facing regions of the walls 10 form baffles 11.
- the air streams emerging from the holes 14 on one side strike the opposite baffle 11 and vice versa.
- the flow is then guided along the curved area 12 and the adjoining area 13. This is indicated schematically in FIG. 2 by the line S for one side.
- the impact surfaces 11 are each inclined by the same angle a in the embodiment shown with respect to a transverse plane V perpendicular to the movement plane E of the material web B, as can be seen from FIG. 3. But it is also possible, depending on the requirements to choose the inclination of the two baffles differently. Fig. 3 illustrates this on a dash-dotted impact surface 11 ', which has a greater inclination than the other impact surface 11 with the angle b.
- the inclination is expediently in the range from approximately 10 ° to 40 °. Angles of around 15 ° are particularly favorable.
- all parts are formed by a coherent wall 10 which is bent accordingly in the lower apex area.
- the baffle surfaces 11 can also be formed by separate wall parts 10 ', which are brought together at the ends and are tightly connected to one another by spot welding or in another suitable manner.
- a nozzle area of the type described is expediently located approximately in the middle of an air supply duct 9, as can be seen in FIG. 1. Further designs consist in the fact that two such nozzle areas are provided at a distance from one another on a feed channel 9.
- a further possibility is to provide only one baffle 11 on the nozzle area, which is then arranged opposite the corresponding outlet.
- the execution is dan n, for example, such that in the wall portion 10 forming the right baffle 11 in FIG. 2 has no outlets 14, but that such are only present in the wall portion 10 on the left in FIG. 2.
- No guide surface L may then also need to be present on this side, but an angled wall continuation may be attached to the wall section 10 15 as the otherwise normal limitation of a feed channel, as indicated by dash-dotted lines in FIG. 2.
- the outlet diameter d of the outlets can be specified as advantageous values for the outlet diameter d of the outlets.
- the distances e of the outlets can in particular be in the range from approximately 10 to 30 mm.
- the radius R of the curved portion 12 adjoining an impact surface 11 can advantageously be selected in the range from approximately 5 to 25 mm. Depending on the circumstances, other values are also possible.
- FIG. 5 shows an embodiment in which a closure body 21 is located at the base of the nozzle region D. This extends over the entire width of the air channel 9 and has guide surfaces 22 on its side facing the plane of movement of the web B, which run roof-shaped in this embodiment. In the immediate vicinity of these guide surfaces 22 forming the boundary of the end body 21, air outlets in the form of bores 14 are provided in curved wall parts 23. The exiting from these Air currents each pass along the associated guide surface 22 and then meet the curved wall surface 23, where, similarly to the embodiment according to FIG. 2, the Coanda effect takes effect, so that the air around this wall surface and along the planes adjoining it Wall surface 13 flows and thereby acts on the web B and leads floating.
- FIG. 8 shows part of a drying installation for a web B, in which air channels 9 with nozzle areas D of the type described are present.
- the closure body 21 is advantageously designed as a ready-to-install and replaceable unit.
- Fig. 7 illustrates such a closure body 21 'in the form of a drawn metal profile, for example.
- a closure body of this type or a similar design can simply be inserted between two wall parts 24 of the air duct 9, these wall parts fitting tightly against the closure body.
- the fastening of the closing body can be done, for example, by screws 26 indicated in FIG. 5 only with their center lines, which penetrate holes in flange parts 25 of the air duct 9 and in flange parts 27 of the closing body 21.
- a closure body 31 is shown, which, like the closure body 21 in the embodiment according to FIG. 5, is attached to the bottom of the nozzle region D and on opposite sides of one in the region of the transverse plane V in the direction of the movement plane E of the web protruding part 33 has guide surfaces 32.
- Outlets 14 for the air in the immediate vicinity of the beginning of the guide surfaces 32 are also provided in wall parts 23 here. The air streams emerging from them are guided through the guide surfaces 32 so that they each run essentially perpendicular to the plane of motion E in the sense of an impact jet.
- the projecting part 33 of the closure body 31 can also lie outside the transverse plane V, and it can in particular also be at an angle to the transverse plane.
- the two guide surfaces 32 can also each have different positions or inclinations. The same also applies to the guide surfaces 22 in the embodiment according to FIG. 5.
- FIG. 9 illustrates part of a drying installation in which air boxes 9 with end bodies 31 are present in the nozzle area D.
- Such a design is suitable, among other things. for thicker or specifically heavier material webs B. As a result of the impact jet effect, these can be guided in a slightly wavy manner in the longitudinal direction. This includes an advantage when it comes to preventing the edge of the web from rolling up. In the case of thinner or specifically lighter webs, it is usually possible to move them essentially in a straight line, as illustrated in FIG. 8.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Coating Apparatus (AREA)
Abstract
Un dispositif d'application, sur des bandes de matériau (B), d'air ou d'un autre milieu fluide, notamment pour sécher les bandes, comprend des canaux d'air (9) ayant des zones d'injection (D) pourvues d'orifices individuels de sortie d'air (14) agencés des deux côtés d'un plan transversal (V) qui s'étend dans le sens de la longueur du canal d'air (9). Les orifices de sortie d'air (14) font face à une surface de guidage du courant d'air. Deux sections de paroi pourvues d'orifices de sortie peuvent être agencées l'une directement en face de l'autre. Un autre mode de réalisation comprend des surfaces de guidage agencées entre les orifices de sortie des deux côtés du plan transversal.An application device, on strips of material (B), of air or of another fluid medium, in particular for drying the strips, comprises air channels (9) having injection zones (D) provided with individual air outlet orifices (14) arranged on both sides of a transverse plane (V) which extends lengthwise of the air channel (9). The air outlet ports (14) face an air stream guiding surface. Two wall sections with outlet openings can be arranged directly opposite each other. Another embodiment comprises guide surfaces arranged between the outlets on both sides of the transverse plane.
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT87904838T ATE54744T1 (en) | 1986-07-31 | 1987-07-30 | DEVICE FOR APPLYING MATERIAL WEBS WITH FLOW MEDIUM. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19863626016 DE3626016A1 (en) | 1986-07-31 | 1986-07-31 | DEVICE FOR APPLYING MATERIAL RAILS WITH FLOWING MEDIUM |
DE3626016 | 1986-07-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0277159A1 true EP0277159A1 (en) | 1988-08-10 |
EP0277159B1 EP0277159B1 (en) | 1990-07-18 |
Family
ID=6306453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904838A Expired - Lifetime EP0277159B1 (en) | 1986-07-31 | 1987-07-30 | Device for applying a flowing fluid on webs of material |
Country Status (5)
Country | Link |
---|---|
US (1) | US4837947A (en) |
EP (1) | EP0277159B1 (en) |
DE (2) | DE3626016A1 (en) |
FI (1) | FI89980C (en) |
WO (1) | WO1988001038A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4760025A (en) * | 1984-05-29 | 1988-07-26 | Genencor, Inc. | Modified enzymes and methods for making same |
DE3715533C2 (en) * | 1987-05-09 | 1997-07-17 | Krieger Gmbh & Co Kg | Device for levitating material webs |
DE3904774C1 (en) * | 1989-02-17 | 1990-05-17 | Hilmar 5653 Leichlingen De Vits | |
US5471766A (en) * | 1993-03-18 | 1995-12-05 | Valmet Paper Machinery, Inc. | Method in contact-free air-drying of a material web as well as a nozzle-blow-box and a pulp dryer that make use of the method |
DE4334473C2 (en) * | 1993-10-11 | 1997-07-03 | Krieger Gmbh & Co Kg | Device for levitating a running web |
DE4334468C2 (en) * | 1993-10-11 | 1997-07-10 | Krieger Gmbh & Co Kg | Method and device for stabilizing a running web |
US5951006A (en) * | 1998-05-22 | 1999-09-14 | Xerox Corporation | Modular air jet array with coanda exhausting for module decoupling |
DE10344715A1 (en) * | 2003-09-26 | 2005-04-21 | Heidelberger Druckmasch Ag | Device for guiding a printing material |
US8061055B2 (en) * | 2007-05-07 | 2011-11-22 | Megtec Systems, Inc. | Step air foil web stabilizer |
SE535634C2 (en) | 2010-11-16 | 2012-10-23 | Andritz Tech & Asset Man Gmbh | Cellulose dryer having lower blow boxes and method of drying a web of cellulose pulp |
DE212013000118U1 (en) | 2012-05-15 | 2015-01-30 | Andritz Technology And Asset Management Gmbh | Pulp dryer with blow boxes for drying a pulp web |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2802610C2 (en) * | 1978-01-21 | 1983-05-05 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Blow box for floating guidance and / or conveying of webs or sheets |
DE2836103C2 (en) * | 1978-08-17 | 1985-03-21 | Jagenberg-Werke AG, 4000 Düsseldorf | Air nozzle for a nozzle dryer |
US4472888A (en) * | 1982-06-04 | 1984-09-25 | Cary Metal Products, Inc. | Coanda effect nozzle for handling continuous webs |
US4605146A (en) * | 1985-02-15 | 1986-08-12 | E. I. Du Pont De Nemours And Company | Hydrostatic film support |
-
1986
- 1986-07-31 DE DE19863626016 patent/DE3626016A1/en not_active Withdrawn
-
1987
- 1987-07-30 WO PCT/DE1987/000336 patent/WO1988001038A1/en active IP Right Grant
- 1987-07-30 US US07/183,733 patent/US4837947A/en not_active Expired - Fee Related
- 1987-07-30 EP EP87904838A patent/EP0277159B1/en not_active Expired - Lifetime
- 1987-07-30 DE DE8787904838T patent/DE3763828D1/en not_active Expired - Lifetime
-
1988
- 1988-03-23 FI FI881386A patent/FI89980C/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO8801038A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI89980B (en) | 1993-08-31 |
EP0277159B1 (en) | 1990-07-18 |
DE3626016A1 (en) | 1988-02-04 |
DE3763828D1 (en) | 1990-08-23 |
WO1988001038A1 (en) | 1988-02-11 |
FI881386A (en) | 1988-03-23 |
FI89980C (en) | 1996-02-20 |
US4837947A (en) | 1989-06-13 |
FI881386A0 (en) | 1988-03-23 |
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