EP0675064B1 - Luftleitflügel für eine pneumatische Wendestange - Google Patents

Luftleitflügel für eine pneumatische Wendestange Download PDF

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Publication number
EP0675064B1
EP0675064B1 EP95301853A EP95301853A EP0675064B1 EP 0675064 B1 EP0675064 B1 EP 0675064B1 EP 95301853 A EP95301853 A EP 95301853A EP 95301853 A EP95301853 A EP 95301853A EP 0675064 B1 EP0675064 B1 EP 0675064B1
Authority
EP
European Patent Office
Prior art keywords
air
web
arcuate surface
turn
wing extension
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.)
Expired - Lifetime
Application number
EP95301853A
Other languages
English (en)
French (fr)
Other versions
EP0675064A1 (de
Inventor
Allan W. Rogne
Steven J. Ruf
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.)
Durr Megtec LLC
Original Assignee
WR Grace and Co Conn
WR Grace and Co
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 WR Grace and Co Conn, WR Grace and Co filed Critical WR Grace and Co Conn
Publication of EP0675064A1 publication Critical patent/EP0675064A1/de
Application granted granted Critical
Publication of EP0675064B1 publication Critical patent/EP0675064B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B65H2406/111—Means using fluid made only for exhausting gaseous medium producing fluidised bed for handling material along a curved path, e.g. fluidised turning bar

Definitions

  • the present invention relates to devices for contactlessly drying and guiding traveling webs, and more particularly, an improved air flotation turning device which minimizes or eliminates web flutter and/or wrinkling.
  • One conventional arrangement for contactlessly supporting a web includes horizontal upper and lower sets of air bars between which the web travels. Hot air issuing from the air bars both dries and supports the web. Occasionally it becomes necessary to change the direction of web travel while maintaining the contactless environment.
  • Such air turns replaced grater rollers.
  • Grater rollers were a means to turn the web utilizing frictional contact with the web.
  • web marking problems often arose.
  • the air turn was used as a steering device. By tilting one edge of the air turn in a direction perpendicular to and toward the web, a force was provided tending to push the web away from that side. Conversely, if that end of the air turn were moved away from the web, the resulting air pressure forces pulled the web toward that end.
  • Optical sensors are used to monitor web drift and send a signal to the steering drive motor controlling the position of the air turn. The drive motor moved the operator end of the air turn. Alternatively or additionally, the air turn could be tilted manually.
  • an air turn according to the preamble of Claim 1 is that disclosed in U.S. Patent No. 4,182,472.
  • the guide is formed as a drum-like member having an arcuately curved surface which can be variable as to the length of its arc, depending on the degree of turn or change of direction desired for the running web.
  • a series of parallel grooves extending in the direction of web travel are formed in the arcuate surface of the drum-like member.
  • An air nozzle extends along the length of the drum-like member and at each end of the groves, and pressurized air is fed through the nozzles so as to form a pneumatic cushion between the web and the arcuate surface and thereby float the web.
  • the grooves in the arcuate surface act as labyrinth seals in inhibiting the transverse air flow out of the cushion and towards the edges of the running web.
  • U.S. Patent No. 2,689,196 wherein a series of holes are formed in the cylindrical surface for the passage of pressurized air therethrough to support and guide a web passing over the drum.
  • U.S. Patent No. 3,097,971 discloses a device having a series of slits in the curved supporting surface and which extend longitudinally and/or transversely to the web. Air under pressure is passed through these slits to form a cushion between the drum and the web.
  • Airflow instabilities near the web can induce web flutter and subsequent web contact with mechanical parts of the drier, resulting in coating or web damage. Web flutter can be manifested in a multitude of forms, ranging from a violent flapping of the web to a high frequency drumming.
  • Such an air turn is suitable for supporting and optionally drying a web.
  • the air supply nozzle slots which are preferably opposed, circumferentially spaced, and transversely arranged, supply pressurized air to the space between the web and the arcuate surface of the air turn.
  • the air foil wing extensions provided along the leading and/or trailing longitudinal edges of the air turn serve to reduce web flutter.
  • the web support provided by the present invention can support a moving web through various degrees of turning movement, but the present invention has been illustrated in Figure 1 as showing a web support for an approximate 90° turn, wherein the web W passes over, and without contact with, the support S. It should be understood that the following detailed description of the web support is for purposes of illustration and should not be construed as limiting of the present invention.
  • the support S includes a air turn member 1 formed generally with a 90° arcuate surface 2 which extends across the width of the web W to be supported, and preferably beyond the edges of the web.
  • Shaft means SM are provided at each side of the support so that the device can be suitably mounted in the drier apparatus.
  • a series of substantially parallel or parallel grooves 3 can optionally be formed in the surface of the arcuate air turn member 1 and extend in the direction of web travel as disclosed in the aforementioned U.S. Patent No. 4,182,472.
  • the grooves are generally rectangular in cross-section, but may assume other configurations so long as the effect thereof is to create a labyrinth seal whereby the flow of air out from the pressurized cushion is inhibited.
  • the grooves 3 form circumferential ribs 4 and also define the upper surface 2 of arcuate form.
  • the arcuate surface can be smooth, although it is preferred that labyrinth seals be formed therein.
  • An air nozzle N is located along each of the longitudinal ends of the support S and extends the full length thereof transversely across the width of the web being supported.
  • the nozzles are generally U-shaped and have a sharp nozzle edge 6 (Figure 2) spaced a distance from the member 1 so as to define an elongated slot or nozzle 8 through which pressurized air is discharged towards the web.
  • the size of the nozzle opening can be adjusted by a series of screws 12 or the like threadably engaged in the frame F of the device and extending freely through the nozzle N.
  • the nozzle is secured to the support by any suitable means, such as screws or the like.
  • the sides of the support S include end plates 16 secured by cap screws to the ends of the arcuate air turn member 1.
  • the aforementioned shaft means SM are secured to the end plates such as by welding.
  • the shaft means are adjustably mounted in the frame F of the apparatus so that the angular position of the support can be changed by rotating the support on the shafts.
  • the frame F has a series of holes 20 passing therethrough and through which pressurized air is fed from the chamber 24.
  • Chamber 24 is also defined by members 2 and 28 (which can be formed out of sheet metal) secured to a central duct 30 such as by welding.
  • Pressurized air is supplied to the end of the duct 30 by a supply conduit 31 from a suitable air supply AS.
  • the duct 30 has a longitudinal opening 32 which allows air to feed into chamber 24 and be discharged through the nozzle N and to each of the grooves in the arcuate surface.
  • a barrier 34 may be optionally provided extending transversely to the direction of the web travel and across the grooves 3.
  • the barrier 34 blocks the grooves intermediate their length to form a barrier to the air flow in the grooves and eliminate flow instability and prevent one slot 8 from dominating the other.
  • air foil wing sections 60, 61 are shown, preferably fabricated from stainless steel. Each includes a flat, non-perforated portion 63 closest to the air supply slot of the air turn. The discharge air coming from the supply slot increases in velocity as it moves across the flat portions 63 of the wing, which is arranged with respect to the air turn so as to be parallel and in close proximity to the web.
  • each air foil wing extension can be secured to the air turn by any suitable means, such as by screws attached to the frame of the device through brackets 65, 65'. The increased air velocity creates a pressure drop between the flat portions 63 and the web, which tends to draw the web towards the flat portions 63.
  • the air foil wing extensions also each include a perforated section 64 adjacent the flat section and remote from the air turn. As the discharge air moves onto the perforated sections 64, its velocity is gradually reduced. Preferably the perforated sections 64 are bent away from the web at a gradual angle, which increases its distance from the web the further it extends away from the air turn. An angle of about 11° is especially preferred, as best seen in Figure 6.
  • a plurality of perforated bleed ports (shown generally at 66 in Figure 3) of the perforated section 64 allow ambient air to be drawn into the gradual increasing area between the web and this section 64 of the wing. This also causes the air velocity and turbulence to diminish. The net result is a smooth discharge of air from the edges of each air foil wing 61, as shown in Figure 4.
  • the amount and location of the bleed ports 66 is important to achieve a gradual diffusion or slow down in air velocity coming off the flat, non-perforated portion 63 of the wing.
  • the amount and size of the ports increases as the wing extends further from the non-perforated section 63.
  • the perforated section 64 is 51.5 mm (2.028 inches) long and includes three generally parallel rows of ports, as best seen in Figure 5.
  • the first row 67 closest to the flat, non-perforated section 63 includes 62 ports having a diameter of 6.35 mm (0.25 inch) spaced 22 mm (0.875 inches) from each other, beginning and ending 44.5 mm (1.75 inches) from the sides of the wing.
  • the middle row 68 includes 126 ports having a diameter of 6.35 mm (0.25 inch) spaced 11.1 mm (0.437 inches) from each other, beginning and ending 3.3 cm (1.312 inches) from the sides of the wing.
  • the third row 69 furthest from the flat, non-perforated section 63 includes 64 ports having a diameter of 9.5 mm and spaced 22 mm (0.875 inches) from each other, beginning and ending 22 mm (0.875 inches) from the sides of the wing.
  • the perforated section 64 of the wing preferably terminates in a flange portion 70, as can be best seen in Figure 6.
  • the flange portion 70 is 25.4 mm (1 inch) long, and includes a row of ports 71 having a diameter of 7.9 mm (0.312 inch).

Landscapes

  • Drying Of Solid Materials (AREA)
  • Advancing Webs (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Actuator (AREA)
  • Turning (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Tumbler Switches (AREA)
  • Toys (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (5)

  1. Vorrichtung (S) zum kontaktlosen Halten einer Bahn, mit einem Luftwendebauteil (1), das eine längliche, gekrümmte Fläche (2) hat, die durch eine vordere und eine hintere Kante begrenzt ist und über der bei Betrieb eine bewegte Bahn (W) schwebend gehalten ist; einem Paar von zugehörigen, länglichen Düsen (N), die sich an der vorderen und an der hinteren Kante entlang der Länge der gekrümmten Fläche der Vorrichtung zum Halten der Bahn erstrecken, wobei jede der Düsen Auslaßschlitze (8) hat, die dazu ausgestaltet sind, unter Druck stehende Luft über die gekrümmte Fläche auszustoßen; und Einrichtungen (AS,31), um den Düsen unter Druck stehende Luft zuzuführen; gekennzeichnet durch eine erste Luftleitflügelverlängerung (60), die an der vorderen oder an der hinteren Längskante des Luftwendebauteils (1) angebracht ist, wobei die erste Luftleitflügelverlängerung einen ersten ebenen Bereich (63), der sich weg von der gekrümmten Fläche erstreckt, und benachbart zu dem ersten ebenen Bereich einen zweiten durchlochten Abschnitt (64) aufweist.
  2. Vorrichtung zum kontaktlosen Halten einer Bahn nach Anspruch 1, dadurch gekennzeichnet, daß der zweite durchlochte Abschnitt bezüglich des ersten ebenen Bereiches mit einem Winkel angeordnet ist.
  3. Vorrichtung zum kontaktlosen Halten einer Bahn nach Anspruch 2, dadurch gekennzeichnet, daß der Winkel ungefähr 11° beträgt.
  4. Vorrichtung zum kontaktlosen Halten einer Bahn nach einem der Ansprüche 1 bis 3, weiterhin gekennzeichnet durch eine zweite Luftleitflügelverlängerung (61), die an der Längskante des Luftwendebauteils (1) angebracht ist, die nicht die Kante ist, an der die erste Luftleitflügelverlängerung angebracht ist, wobei die zweite Luftleitflügelverlängerung einen ebenen Bereich (63), der sich weg von der gekrümmten Fläche erstreckt, und benachbart zu dem ebenen Bereich einen durchlochten Abschnitt (64) aufweist.
  5. Vorrichtung zum kontaktlosen Halten einer Bahn nach einem der Ansprüche 1 bis 4, gekennzeichnet durch eine Anzahl von im wesentlichen parallelen Rillen, die Labyrinthdichtungen bilden, die sich um die gekrümmte Fläche in einer Richtung erstrecken, in der die Bahn darüber hinweggeführt wird.
EP95301853A 1994-04-01 1995-03-20 Luftleitflügel für eine pneumatische Wendestange Expired - Lifetime EP0675064B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22161494A 1994-04-01 1994-04-01
US221614 1994-04-01

Publications (2)

Publication Number Publication Date
EP0675064A1 EP0675064A1 (de) 1995-10-04
EP0675064B1 true EP0675064B1 (de) 1997-10-01

Family

ID=22828551

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95301853A Expired - Lifetime EP0675064B1 (de) 1994-04-01 1995-03-20 Luftleitflügel für eine pneumatische Wendestange

Country Status (9)

Country Link
EP (1) EP0675064B1 (de)
JP (1) JPH0848446A (de)
AT (1) ATE158781T1 (de)
CA (1) CA2145058C (de)
CZ (1) CZ79495A3 (de)
DE (1) DE69500781T2 (de)
HU (1) HUT71216A (de)
RU (1) RU95104881A (de)
SK (1) SK42995A3 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5967457A (en) * 1996-07-23 1999-10-19 Thermo Wisconsin, Inc. Airfoil web stabilization and turning apparatus and method
US6505792B1 (en) * 2000-11-28 2003-01-14 Megtec Systems, Inc. Non-contact floating device for turning a floating web
DE102005048217B4 (de) * 2005-09-29 2007-12-06 Gerhard Bach Leitvorrichtung zum Leiten von flexiblem Flachmaterial
JP5152477B2 (ja) * 2007-08-22 2013-02-27 Ｂｅｌｌｍａｔｉｃ株式会社 フィルム状物等の浮揚装置
DE102007058405B4 (de) * 2007-11-02 2010-03-25 Gerhard Bach Umlenkvorrichtung zum Umlenken von flexiblem Flachmaterial
ES2704100T3 (es) * 2013-05-08 2019-03-14 Kdesign Gmbh Dispositivo calibrador para calibrar una película tubular extrudida
CN110953852B (zh) * 2019-12-18 2021-04-02 重庆红果服饰有限公司 一种用于纺织面料的悬挂晾晒装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3127080A (en) * 1964-03-31 Web turning device
GB1307695A (en) * 1970-08-19 1973-02-21 Ilford Ltd Air flotation turner bars
US4182472A (en) * 1978-07-13 1980-01-08 W. R. Grace & Co. Contactless turning guide for running webs
US5242095A (en) * 1990-12-20 1993-09-07 Advance Systems, Inc. Contactless air turn guide with baffles for running webs
US5317817A (en) * 1992-04-30 1994-06-07 W. R. Grace & Co.-Conn. Trailing sheet assembly for an air turn

Also Published As

Publication number Publication date
HU9500958D0 (en) 1995-05-29
HUT71216A (en) 1995-11-28
DE69500781T2 (de) 1998-02-26
EP0675064A1 (de) 1995-10-04
JPH0848446A (ja) 1996-02-20
CA2145058A1 (en) 1995-10-02
ATE158781T1 (de) 1997-10-15
CZ79495A3 (en) 1995-12-13
DE69500781D1 (de) 1997-11-06
SK42995A3 (en) 1995-10-11
RU95104881A (ru) 1996-12-20
CA2145058C (en) 2003-05-27

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