EP0291832A1 - Dispositif de séchage de bandes de matière guidées librement par les tuyères d'un coussin d'air - Google Patents

Dispositif de séchage de bandes de matière guidées librement par les tuyères d'un coussin d'air Download PDF

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Publication number
EP0291832A1
EP0291832A1 EP19880107548 EP88107548A EP0291832A1 EP 0291832 A1 EP0291832 A1 EP 0291832A1 EP 19880107548 EP19880107548 EP 19880107548 EP 88107548 A EP88107548 A EP 88107548A EP 0291832 A1 EP0291832 A1 EP 0291832A1
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EP
European Patent Office
Prior art keywords
nozzle
material web
perforated plate
air
section
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Withdrawn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
EP19880107548
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German (de)
English (en)
Inventor
Hilmar Vits
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0291832A1 publication Critical patent/EP0291832A1/fr
Withdrawn legal-status Critical Current

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    • 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 drying freely guided material webs by means of blowing air nozzles, in which a perforated plate is arranged between nozzle slots (or rows of holes) arranged on the long sides, in particular convexly curved towards the material web, both nozzle slots, the blowing jets of which above the plate form an air cushion between them, different angles of inclination to the central guide plane of the material web and possibly the nozzle slots have a different cross section.
  • the quality of a device for drying material webs is measured not only by the drying performance, but also and in many cases mainly by whether the material web is guided stably by the blowing air acting on it. Since material webs with different properties must be dried with free guidance, it goes without saying that, depending on the properties of the material web The demand for stable leadership cannot always be met fully satisfactorily. While material webs that have a certain surface stability, such as finished papers or foils, can usually be guided satisfactorily with the blowing air nozzles available today, there are no suitable blowing air nozzles available for material webs that have only a low surface stability, such as knitted fabrics .
  • the known edge flutter of the material webs is particularly problematic, which is due to the fact that air flows out of the air cushion between the two blowing jets on the one hand and the material web and the plate on the other hand to the edges of the material web. Try with one over their entire surface of the perforated plate between the nozzle slots, through the perforation of which air was blown into the air cushion (DE 26 15 258 C2), did not lead to satisfactory results. The individual blown air jets emerging from the perforation also disrupt the flow behavior of the blown air emerging from the nozzle slots, which in turn leads to poorer guiding properties. This applies in particular when the distance between the material web and the perforated plate increases, because in this case the overflow that is moderate for guiding the material web is particularly disturbed.
  • blowing air nozzles which are also called “air cushion nozzles” because of the air cushion built up between the material web and the plate
  • blowing air nozzles based on another principle of action the so-called “airfoil nozzles” are known for guiding material webs, in which on one longitudinal side one of the material web in particular a convexly curved plate, a nozzle slot is provided, the blown air jet of which flows over the plate at high speed in the direction of the other long side (DT-AS 17 74 126). This creates forces that suck the material web onto the plate.
  • openings can be provided in the plate through which the negative pressure prevailing between the material web and the plate can be reduced to an uncritical value. Due to the inclined position of the plate in relation to the material web, in particular due to a large distance between the nozzle slot and a small distance between the openings, the forces of the blowing air acting on the material web can also be influenced in the sense of stable guidance.
  • a blown air nozzle is known (DT-AS 20 20 430), which can be converted from an "air cushion nozzle” into a “wing nozzle”.
  • This blowing air nozzle has on its opposite longitudinal sides two nozzle slots and a perforated plate arranged between them, through which blowing air can be blown into the space between the slots and the material web.
  • the blowing air nozzle has an essentially symmetrical structure. The result of this is that the blown air flows out of the air cushions purely by accident over one or the other long side. As with the other air cushion nozzle, there is also a risk of edge flutter. With the setting "wing nozzle", the outflow direction is fixed to only one long side, but there is a risk that the material web will touch the nozzle due to the suction forces acting on it with difficulty.
  • the object of the invention is to provide a device for drying material webs of the type mentioned at the beginning, in which material webs which are to be guided with difficulty are also guided with a high degree of stability.
  • a stowage chamber is arranged behind the perforated plate, into which air flows in from the air cushion, which flows out through the perforation in the region of the material web edges and thus the outflow of air from the air cushion through the space between the perforated plate and the material web to the material web edges hindered.
  • the nozzle slots can have such different distances from the central guide level of the material web and the perforated plate is arranged so inclined to the guide plane that there is an outflow of the blown air from the air cushion only over one long side.
  • the cross-section of the perforation in the plate and the cross-section of the stowage chamber allow a specific range and strength of action to be set in the area of the edges of the material web.
  • the distance between the bottom of the storage chamber and the perforated plate is preferably 4-12% of the distance between the two nozzle slots. It has proven to be advantageous if the cross section of the perforation is at least equal to the sum of the cross sections of the nozzle slots and is 4-12% of the plate surface.
  • the blown air jet from the nozzle slot with the smaller clear width serves to enable the formation of the air cushion above the perforated plate but, on the other hand, is to allow it to flow away, it is provided according to an embodiment of the invention which favors these requirements that the transition from the perforated plate forms a tear-off edge for the flow into the adjacent nozzle lip of the nozzle slot of smaller cross-section. It has turned out to be favorable if the radius of curvature of the transition is smaller than the width of the slot. It is important that the blast air jet from the nozzle slot with the larger inside diameter, which blows into the space between the material web and the perforated plate, is able to deflect the blown air jet out of the nozzle slot with the smaller inside diameter.
  • the nozzle slot has a larger cross-section and, if necessary, a flatter inclination of the blow jet is at a greater distance from the material web guide plane of the material web.
  • a high heat transfer coefficient is also achieved.
  • the transition from the perforated plate into the adjacent nozzle lip of the nozzle slot of larger cross section is preferably designed as a tear-off edge for the flow. The blown air jet can therefore act on the material web in the manner of a free jet, by means of which it is deflected into the space between the material web and the perforated plate.
  • the blocking function is in the foreground, as is the case, for example, at the entrance to a dryer, according to one embodiment of the invention it is provided that the blowing air nozzles are located on both sides of the material web are arranged, the nozzle slot of larger cross-section and possibly flatter inclination of the blowing jet is a smaller distance from the central guide plane of the material web than the other nozzle slot and wherein the inner nozzle lip of the nozzle slot of larger cross-section merges convexly in the perforated plate so that the blowing air jet due to the Coanda effect attaches itself to the perforated plate.
  • blowing air nozzles which are offset and arranged opposite one another.
  • the oppositely arranged blowing air nozzles are arranged at the entrance and end of the drying section and the oppositely arranged blowing air nozzles are arranged in the area in between, with the downstream side of the blowing air nozzles facing the center of the drying section.
  • a heating element in the form of a radiator is arranged between two blown air nozzles with the same direction of outflow side and an outflow channel in the outflow direction of the blown air from the air cushion directly in front of the second blown air nozzle.
  • the blowing air nozzle according to FIGS. 1 and 2, hereinafter referred to as air cushion nozzle because of its principle of action, has an asymmetrical structure.
  • two nozzle slots 3, 4 are at different distances.
  • the nozzle slot 3, which has a cross section which is many times larger than the nozzle slot 4, is at a greater distance from the guide plane 1 than the smaller nozzle slot 4.
  • the angle of inclination of the blowing air jet 5 emerging from it is also less steep than that of the blowing air jet 6 of the smaller nozzle slot 4 .
  • a perforated plate 9 which is convexly curved towards the web 2, the area adjacent to the nozzle lip 7 with the guide level 1 forming an acute angle and the area adjacent to the nozzle lip 8 to the guide level 1 is essentially parallel. This results in an oblique position of the perforated plate 9.
  • the oblique position is dimensioned such that the distance of the nozzle slot 3 from the guide plane 1 is approximately five times the slot width.
  • the cross section of the perforation of the perforated plate of the entire plate surface is 4-12% and is at least equal to the sum of the cross sections of the nozzle slots 3.4.
  • the blast air jet 5 strikes the material web 2 as a free jet and is deflected by it in the direction of the nozzle slot 4.
  • the resistance of the blown air jet 6 creates a jam, so that an air cushion is built up between the plate 9 and the material web 2, but the blown air jet 6 cannot withstand the dynamic pressure due to its small cross-section and its steep incline, but instead flows out deflected with the air the air cushion.
  • a small part of the jammed air reaches the stowage chamber 10 via the perforation and flows to the two ends of the stowage chamber 10. Only in the outer area, where the material web 2 no longer covers the perforated plate 9, can the air escape again through the perforation of the plate 9.
  • the blown air escaping through the exposed perforation has the special effect that it interferes with the blown air component flowing out of the air cushion area between the perforated plate 9 and the material web 2 towards the edges of the material web by braking and thereby prevents this blown air component from fluttering around the edge of the material web 2 to effect.
  • the perforated plate 9 and the storage chamber 10 can be designed in various ways. It is also possible to retrofit air cushion nozzles with an asymmetrical structure with perforated plates and to position them in relation to the guide level in such a way that, in principle, the structure is the same.
  • Air cushion nozzles 12-19 of the type shown in FIGS. 1 and 2 are arranged offset on both sides of a material web 20 to form a dryer section in the direction of the material web.
  • the special feature of this arrangement is that the outflow side of the individual air cushion nozzles are on the side facing the center M. This ensures that when installed in a dryer there is no excessive flow pressure to the outside at the inlet and outlet slots. So that the flows directed towards each other in the center M do not interfere with this arrangement, blocking air cushion nozzles 21, 22 are arranged in the region of the center M, which have the structure shown in FIG.
  • These air cushion nozzles have two nozzle slots 23, 24 and a plate 25 connecting the inner nozzle lips, on which a bluff body 25a with sharp-edged steps 26 is arranged on both sides.
  • a jamming air cushion forms, which counteracts an overflow of blown air.
  • air cushion nozzles according to the invention are also possible, in contrast to conventional air cushion nozzles, to arrange air cushion nozzles according to the invention on opposite sides of the web, which in principle have the same structure as the air cushion nozzles according to FIG 1 and 2 have the difference, however, that the perforated plate 29, 30 is inclined in the opposite direction and the transition 31, 32 of the inner nozzle lip 32, 33 of the nozzle slot 35, 36 of larger cross section into the perforated plate 29, 30 is formed in such a convex manner that the blown air jet 37, 38 completely flows into the space between the material web 39 and the perforated plate 29, 30 due to the Coanda effect.
  • the blown air jet becomes 37.38 In contrast to the previous exemplary embodiment, it does not act as a free jet and therefore does not have to be deflected from the material web 39, but rather reaches the space between the material web 39 and the perforated plate 29, 30 solely due to the Coanda effect.
  • the undisturbed overflow of the perforated plate 29, 30 and the effect of blowing air escaping from the stowage chamber 40, 41 in the region of the edges of the material web 39 are retained.
  • the opposite inclination of the perforated plate 29, 30 serves to ensure that the air cushion only extends as far as the middle guide plane of the material web 39 and not into the effective area of the opposite nozzle. In the exemplary embodiment with offset air cushion nozzles (FIG. 5), this requirement is irrelevant, since a wavy material web course is even desirable here for more stable guidance.
  • the air cushion nozzles 42, 43 shown in FIG. 4 have the same structure as the air cushion nozzles according to FIGS. 1 and 2, but their geometric arrangement with respect to the material web 44 is different, namely that of the air cushion nozzles 27, 28 according to FIG. 3.
  • the height of the air cushion must be limited in order not to push the material web 44 away from the central guide plane in the case of a one-sided arrangement several times in succession. No high heat transfer is required here either, but the other properties of the air cushion nozzle according to the invention with regard to the stable guidance and in particular the edge flutter of the material web to be avoided are required.
  • a high heat transfer is not required because, in this embodiment, an infrared radiator 45 serving as a heating element is provided between the two air cushion nozzles 42, 43.
  • the drying power is therefore mainly from this radiator 45 and not from the air cushion nozzles 42,43.
  • An outflow channel 46 is arranged between the radiator 45 and the next air cushion nozzle 43 and receives the blown air enriched with the medium of the material web 44 to be dried.
EP19880107548 1987-05-16 1988-05-11 Dispositif de séchage de bandes de matière guidées librement par les tuyères d'un coussin d'air Withdrawn EP0291832A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3716468 1987-05-16
DE19873716468 DE3716468A1 (de) 1987-05-16 1987-05-16 Vorrichtung zum trocknen von freigefuehrten materialbahnen mittels freigefuehrter luftkissenduesen

Publications (1)

Publication Number Publication Date
EP0291832A1 true EP0291832A1 (fr) 1988-11-23

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EP19880107548 Withdrawn EP0291832A1 (fr) 1987-05-16 1988-05-11 Dispositif de séchage de bandes de matière guidées librement par les tuyères d'un coussin d'air

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EP (1) EP0291832A1 (fr)
DE (1) DE3716468A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0360213A2 (fr) * 1988-09-19 1990-03-28 Fuji Photo Film Co., Ltd. Appareil de transport de bande sans contact
DE4110875A1 (de) * 1991-04-04 1992-10-08 Voith Gmbh J M Trockenpartie
EP0508253A1 (fr) * 1991-04-12 1992-10-14 Van Brandwijk Systems Programming B.V. Procédé et dispositif de traitement thermique d'une bande continue munie d'une composition fluide ou pâteuse
EP0539013A1 (fr) * 1991-10-24 1993-04-28 W.R. Grace & Co.-Conn. Sécheur à infrarouge et à support pneumatique combiné
EP0541106A1 (fr) * 1991-11-07 1993-05-12 Air Engineering P. Müller + Partner Buse avec section carrée ou rectangulaire
EP0916915A1 (fr) * 1997-11-14 1999-05-19 Solaronics Système convecto-radiatif pour traitement thermique d'une bande continue
US8061055B2 (en) 2007-05-07 2011-11-22 Megtec Systems, Inc. Step air foil web stabilizer
CN1942727B (zh) * 2004-04-13 2011-12-14 美格特克系统公司 阶梯热风气翼

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4012176C2 (de) * 1990-04-14 2000-08-17 Pagendarm Technologie Gmbh Vorrichtung zum Behandeln einer beschichteten Substratbahn

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873013A (en) * 1973-10-04 1975-03-25 Tec Systems High velocity web floating air bar having center exhaust means
DE2524168A1 (de) * 1975-05-31 1976-12-02 Vits Maschinenbau Gmbh Vorrichtung zum schwebenden fuehren von materialbahnen
DE2615258C2 (de) * 1976-04-08 1983-03-17 Vits-Maschinenbau Gmbh, 4018 Langenfeld Vorrichtung zum schwebenden Führen von Materialbahnen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1774126B1 (de) * 1968-04-13 1972-07-13 Vits Maschb Gmbh Einrichtung zur Stabilisierung der Lage bahn- oder bogenfoermiger Werkstuecke

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873013A (en) * 1973-10-04 1975-03-25 Tec Systems High velocity web floating air bar having center exhaust means
DE2524168A1 (de) * 1975-05-31 1976-12-02 Vits Maschinenbau Gmbh Vorrichtung zum schwebenden fuehren von materialbahnen
DE2615258C2 (de) * 1976-04-08 1983-03-17 Vits-Maschinenbau Gmbh, 4018 Langenfeld Vorrichtung zum schwebenden Führen von Materialbahnen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0360213A2 (fr) * 1988-09-19 1990-03-28 Fuji Photo Film Co., Ltd. Appareil de transport de bande sans contact
EP0360213A3 (fr) * 1988-09-19 1991-02-27 Fuji Photo Film Co., Ltd. Appareil de transport de bande sans contact
US5480086A (en) * 1988-09-19 1996-01-02 Fuji Photo Film Co., Ltd. Non-contact web conveying apparatus
DE4110875A1 (de) * 1991-04-04 1992-10-08 Voith Gmbh J M Trockenpartie
EP0508253A1 (fr) * 1991-04-12 1992-10-14 Van Brandwijk Systems Programming B.V. Procédé et dispositif de traitement thermique d'une bande continue munie d'une composition fluide ou pâteuse
EP0539013A1 (fr) * 1991-10-24 1993-04-28 W.R. Grace & Co.-Conn. Sécheur à infrarouge et à support pneumatique combiné
EP0541106A1 (fr) * 1991-11-07 1993-05-12 Air Engineering P. Müller + Partner Buse avec section carrée ou rectangulaire
EP0916915A1 (fr) * 1997-11-14 1999-05-19 Solaronics Système convecto-radiatif pour traitement thermique d'une bande continue
FR2771161A1 (fr) 1997-11-14 1999-05-21 Solaronics Systeme convecto-radiatif pour traitement thermique d'une bande continue
US6088930A (en) * 1997-11-14 2000-07-18 Solaronics Process Sa Convection-radiation system for heat treatment of a continuous strip
CN1942727B (zh) * 2004-04-13 2011-12-14 美格特克系统公司 阶梯热风气翼
US8061055B2 (en) 2007-05-07 2011-11-22 Megtec Systems, Inc. Step air foil web stabilizer

Also Published As

Publication number Publication date
DE3716468C2 (fr) 1989-11-02
DE3716468A1 (de) 1988-12-01

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