EP0298299B1 - Dispositif pour guider des bandes sans contact direct - Google Patents

Dispositif pour guider des bandes sans contact direct Download PDF

Info

Publication number
EP0298299B1
EP0298299B1 EP88109878A EP88109878A EP0298299B1 EP 0298299 B1 EP0298299 B1 EP 0298299B1 EP 88109878 A EP88109878 A EP 88109878A EP 88109878 A EP88109878 A EP 88109878A EP 0298299 B1 EP0298299 B1 EP 0298299B1
Authority
EP
European Patent Office
Prior art keywords
web
material web
blowing
nozzle
flow deflecting
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
EP88109878A
Other languages
German (de)
English (en)
Other versions
EP0298299A1 (fr
Inventor
Hilmar Vits
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT88109878T priority Critical patent/ATE68221T1/de
Publication of EP0298299A1 publication Critical patent/EP0298299A1/fr
Application granted granted Critical
Publication of EP0298299B1 publication Critical patent/EP0298299B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/18—Drying webs by hot air
    • D21F5/185—Supporting webs in hot air dryers
    • D21F5/187—Supporting webs in hot air dryers by air jets
    • D21F5/188—Blowing devices

Definitions

  • the invention relates to a device for contactless guiding of material webs with at least two blowing nozzles arranged one behind the other in the running direction of the material web and extending transversely to it and designed as slots or rows of holes, the blowing jets of which are directed in the same direction and obliquely against the material web and on the side facing the material web are guided by flow guide bodies, of which the flow guide body adjoining the blowing nozzle rearward in the running direction of the material web is convexly curved toward the material web.
  • Such overflowed wings together with the material web form Venturi diffusers, the material web being caused to flutter by the Bernoulli effect.
  • the flutter can be suppressed by special measures, for example by a perforation in the wing, since additional air flowing in then allows the flow to remain on the material web, or by wing suction, since then the Flow only remains on the wing.
  • Such one-sided flows also arise in exceptional cases if the material web tension and the material weight on the one hand and the wing shape and wing overflow on the other hand are coordinated. However, keeping them clean and free movement in the production of a paper machine generally does not permit the above measures or the conditions for clear flow conditions. Because with a Venturi diffuser the narrowest point between the material web and the wing back changes depending on the conditions, flapping cannot be avoided and safety against contact cannot be achieved.
  • the flow guide between the convexly curved flow guide of the rear blowing nozzle and the front blowing nozzle runs essentially parallel to the material web.
  • the surface of the parallel flow guide body can be roughened, in particular have corrugations. No special precautions have been taken to prevent the material web from fluttering. There is therefore a risk that the material web will strike (DT 19 54 880 B2).
  • the invention has for its object to provide a device for contactless guiding of material webs of the type mentioned, which ensures flutter and contact-free guidance of the material web.
  • the effects of an airfoil and air cushion nozzle are combined.
  • the material web is stabilized by the blown air flowing over the flow guide bodies by being sucked up to the flow guide bodies to a small distance.
  • the forces of a strong air cushion prevail in the immediate vicinity.
  • both the attraction effect and the damping against fluttering are considerably improved.
  • the back of the wing of the simple diffuser is replaced by a hollow space, the step, so that there is no risk of contact; are also by the edges of the Level the narrowest points uncritically determined.
  • the device according to the invention is not subject to any restrictions with regard to the pressure and the volume of the blowing agent supplied. It can therefore be adapted to the respective thermodynamic needs. At high pressure and low air volume, it can be made small so that it can also be accommodated in places where little space is available, such as on the sections of the paper web that are freely guided between the drying cylinders of a paper machine. Their use is particularly advantageous here because it results in a multiple increase in performance.
  • the running speed of the paper machine increases because the device acts as a drying nozzle with high heat transfer and distributes the steam vapors over and over the full width of the web with and through fresh air. This counteracts the non-uniformity of the moisture profile across the width of the paper web. At the same time, edge flutter is restricted. It is also advantageous that the blowing nozzles can be operated with unheated fresh air, since the natural heat of the paper has sufficient heat capacity for drying.
  • Another area of application for the device according to the invention is the drying of material webs by means of gas-heated infrared burners.
  • they are designed for large air volumes and low pressures because the flue gases generated by the infrared burners during drying are small in volume but high in temperature to have.
  • a lot of blown air volume is required to absorb the hot flue gases while absorbing the water vapor generated during drying and to reduce the resulting mixed air to a low temperature that is not critical for the discharge pipes.
  • the device can be used at the inlet and / or outlet slots of dryers in order to seal the dryer at the inlet and / or outlet slot from the outside atmosphere.
  • the device according to FIG. 1 has two blowing nozzles 2, 3 arranged one behind the other in the running direction of a material web 1 and extending transversely to it.
  • the blowing direction of these blowing nozzles 2, 3 is directed obliquely against the material web in the dot-dash position in which it would be without the effect of the device according to the invention.
  • the so-called threading rope 4 for pulling a paper web also runs in a paper machine.
  • the slot-shaped blowing nozzles 2, 3 with their nozzle lips 5, 6, 7, 8 are formed from solid shaped bodies 9, 10, 11.
  • the flow guide body 13 located between the flow guide body 12 of the rear blow nozzle 2 and the rear nozzle lip 6 of the front blow nozzle 3 is designed as an impact diffuser. In the exemplary embodiment, it has two stages 12a, 12b. The length of each step 12a, 12b is at least three times the height of the step.
  • the material web 1 takes the course shown in the drawing. It can be seen that they are closely spaced the flow guide bodies 12, 13 and the impact diffuser 12a, 12b is guided without touching. This is possible because the material web 1 is subjected to repulsive and attractive forces.
  • the device shown in FIG. 1 is used in accordance with FIG. 2 in a paper machine, specifically on the free path of the paper web 1 guided between an upper drying cylinder 14 and a lower drying cylinder 15.
  • Felt guide rollers 16, 17 are assigned to the drying cylinders 14, 15 run with the upper and lower felt 18,19.
  • a doctor blade 20 associated with the lower drying cylinder, which forms a structural unit with the device according to the invention.
  • a duct 24 consisting of welded and welded plates 22, 23 is fastened to a pipe 21 which can be adjusted in the direction of the double arrow P for the supply of blown air. Blown air is supplied to this channel 24 via openings 25 in the jacket of the tube 21.
  • the shaped bodies 9, 10, 11 shown in FIG. 1 are mounted on the plate 23 facing the paper web 1.
  • the molded body 9 comprising the nozzle lip 5 also serves as a clamping plate for the scraper 26 of the squeegee. Blown air is supplied to the blower nozzles 2, 3 from the duct 24 via openings 27, 28 in the plate 23.
  • FIG. 3 differs from that of FIG. 1 essentially only in that the guide body 30 designed as an impact diffuser is single-stage and that the convexly curved flow guide body 31 is closer to the front blowing air nozzle 32 of the material web 1 than the convexly curved flow guide body 33 rear blowing air nozzle 34.
  • the device according to FIG. 1 is constructed from compact shaped bodies 9, 10, 11 and is intended for high pressures and small volumes
  • the device according to FIG. 3 is constructed from sheet metal and is intended for small pressures and large volumes. Such devices are advantageously used in gas-heated infrared radiation fields 35.
  • two infrared emitters 36, 37 form a radiation field, on the rear edge of which in the direction of the material web the device according to FIG. 3 is arranged.
  • a suction unit 35 for a first partial volume and a deflection and return unit 36 for another partial volume are arranged on the opposite front edge.
  • the blow jet blown into the area of the infrared radiation field by the device according to the invention diverges, as indicated by the dashed line 37. It absorbs the steam 38 released from the material web during drying.
  • the infrared radiation burner 36, 37 enters the blow jet from the space above the dashed line 37 flue gas 39.
  • a partial volume of this blow jet consisting of the weights of the nozzle outlet, the steam and the flue gas, is removed from the suction unit 35, while another part, consisting of the excess mass of the jet admixture, is returned according to the flow arrows 40.
  • FIG. 5 which shows a double nozzle of symmetrical design
  • the individual nozzle has in principle the structure of that of FIG. 1.
  • Such symmetrical double nozzles are used when the task is to stabilize a material web over a large free distance and to supply it with air supply.
  • a device according to the invention with a two-stage diffuser is arranged above and below the material web.
  • the devices are arranged on the inside of the insulated end wall 41, 42 which forms the inlet slot of a dryer.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Advancing Webs (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (10)

  1. dispositif pour guider des bandes de matériau (1) sans contact direct, avec au moins deux buses de soufflage (2,3), réalisées sous forme de fente ou de lignes de trous, disposées l'une derrière l'autre dans la direction de déplacement de la bande de matériau (1) et s'étendant transversalement à celle-ci, dont les jets de soufflage sont dirigés dans le même sens et obliquement contre la bande de matériau (1) et sont guidés sur la face tournée vers la bande de matériau (1) par des corps de guidage d'écoulement (12, 12a, 12b, 13), parmi lesquels le corps de guidage d'écoulement (12) suivant la buse de soufflage arrière (2) dans la direction de déplacement de la bande de matériau (1), est courbé de manière convexe en direction de la bande de matériau (1),
    caractérisé en ce que le corps de guidage d'écoulement (12a, 12b) disposé entre le corps de guidage d'écoulement (12) courbé de manière convexe et la buse de soufflage avant (6) est réalisé sous forme d'un diffuseur à chocs à au moins un étage.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que la longueur de chaque étage (12a, 12b) du diffuseur à chocs correspond à au moins trois fois la hauteur de cet étage.
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que le bord avant du corps de guidage d'écoulement (12a, 12b) constitué sous forme du diffuseur à chocs forme la lèvre (6) de buse arrière de la buse avant (3).
  4. Dispositif selon l'une des revendications 1 à 3,
    caractérisé en ce que le corps de guidage d'écoulement (13) adjacent à la buse de soufflage avant (3) est courbé de manière convexe en direction de la bande de matériau (1).
  5. Dispositif selon la revendication 4,
    caractérisé en ce que le corps de guidage d'écoulement (13) courbé de manière convexe de la buse de soufflage avant (3) se trouve plus près de la bande de matériau (1) que le corps de guidage d'écoulement (12) courbé de manière convexe de la buse de soufflage arrière (2).
  6. Dispositif selon l'une des revendications 1 à 5,
    caractérisé en ce qu'il est disposé dans une machine à papier avec des cylindres de séchage supérieur et inférieur (14, 15) pour la bande de matériau (1) sur un segment libre de la bande de matériau (1) formé entre le cylindre de séchage supérieur (14) et l'un des cylindres de séchage inférieur (15), avec une composante du jet de soufflage dirigée dans la direction de déplacement de la bande de matériau.
  7. Dispositif selon la revendication 6,
    caractérisé en ce qu'il est porté par le support (22, 23) d'une raclette (26) pouvant être serrée sur un cylindre de séchage.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que le support (22, 23) comporte un canal d'amenée (24) pour l'agent de soufflage devant être amené aux buses de soufflage (2,3).
  9. Dispositif selon l'une des revendications 1 à 5,
    caractérisé en ce qu'il est disposé d'un côté d'un champ de rayonnement infrarouge (36, 37).
  10. Dispositif selon la revendication 9,
    caractérisé en ce qu'une unité d'aspiration (35) pour un volume partiel et une unité de déviation et de retour (36) pour un autre volume partiel sont disposées de l'autre côté du champ de rayonnement infrarouge (36, 37).
EP88109878A 1987-07-07 1988-06-22 Dispositif pour guider des bandes sans contact direct Expired - Lifetime EP0298299B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88109878T ATE68221T1 (de) 1987-07-07 1988-06-22 Vorrichtung zum beruehrungslosen fuehren von materialbahnen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3722354 1987-07-07
DE3722354 1987-07-07

Publications (2)

Publication Number Publication Date
EP0298299A1 EP0298299A1 (fr) 1989-01-11
EP0298299B1 true EP0298299B1 (fr) 1991-10-09

Family

ID=6331038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109878A Expired - Lifetime EP0298299B1 (fr) 1987-07-07 1988-06-22 Dispositif pour guider des bandes sans contact direct

Country Status (5)

Country Link
US (1) US4893416A (fr)
EP (1) EP0298299B1 (fr)
JP (1) JPH0192157A (fr)
AT (1) ATE68221T1 (fr)
DE (1) DE3865381D1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3841909A1 (de) * 1988-04-02 1989-10-19 Hilmar Vits Verfahren und vorrichtung zum schwebenden fuehren von bogen- oder bahnfoermigem material ueber eine foerderstrecke, insbesondere eine gekruemmte foerderstrecke
FI96125C (fi) * 1991-09-05 1996-05-10 Valmet Paper Machinery Inc Rainojen käsittelyyn tarkoitettu alipainesuutinjärjestely ja menetelmä rainojen käsittelyyn tarkoitetussa alipainesuutinjärjestelyssä
FI92421B (fi) * 1992-03-19 1994-07-29 Valmet Paper Machinery Inc Menetelmä ainesratojen ilmakuivatuksessa, ilmakuivattimen suutin-puhalluslaatikko ja sellukuivatin
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
DE19839916A1 (de) 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zur Verminderung des Volumens oder Drucks eines Fluids, das von sich bewegenden Oberflächen in einen Spalt eingeschleppt wird
FI105936B (fi) 1999-03-18 2000-10-31 Valmet Corp Menetelmä ja laite radan kulun stabiloimiseksi paperikoneessa tai vastaavassa
US6936137B2 (en) * 2001-10-24 2005-08-30 Honeywell International Inc. Air clamp stabilizer for continuous web materials
JP4965231B2 (ja) * 2006-11-21 2012-07-04 株式会社ドクター製作所 通紙用ドクター装置
US8088255B2 (en) * 2008-04-18 2012-01-03 Honeywell Asca Inc Sheet stabilizer with dual inline machine direction air clamps and backsteps
US8177940B2 (en) * 2009-03-04 2012-05-15 Andritz Inc. Apparatus and method for stabilizing a moving web having transitions in a surface adjacent the web
DE102010012084A1 (de) * 2010-03-19 2011-09-22 Sms Siemag Ag Verfahren und Vorrichtung zum Zuführen einer Trennlage auf ein Metallband

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008950A1 (fr) * 1987-05-09 1988-11-17 Kurt Krieger Dispositif pour le guidage flottant de bandes de materiau

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3231165A (en) * 1961-12-02 1966-01-25 Svenska Flaektfabriken Ab Method and apparatus for stabilizing an air-borne web
US3587177A (en) * 1969-04-21 1971-06-28 Overly Inc Airfoil nozzle
CA901281A (en) * 1969-11-07 1972-05-30 Dominion Engineering Works Sonic drying of webs on rolls
DE2556442C2 (de) * 1975-12-15 1984-09-06 Gerhardt, Hans-Joachim, Prof. M.Sc. Dipl.-Ing., 5100 Aachen Vorrichtung zur schwebend Führung von Warenbahnen
FI68723C (fi) * 1978-05-04 1985-10-10 Valmet Oy Dysa foer svaevtork
FI75008C (fi) * 1986-03-14 1992-02-17 Valmet Oy Svaevtork och foerfarande foer effektivering av dess funktion.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988008950A1 (fr) * 1987-05-09 1988-11-17 Kurt Krieger Dispositif pour le guidage flottant de bandes de materiau

Also Published As

Publication number Publication date
US4893416A (en) 1990-01-16
EP0298299A1 (fr) 1989-01-11
DE3865381D1 (de) 1991-11-14
ATE68221T1 (de) 1991-10-15
JPH0192157A (ja) 1989-04-11

Similar Documents

Publication Publication Date Title
DE3403642C2 (fr)
AT392991B (de) Trockenpartie fuer eine maschine zur herstellung oder verarbeitung von faserbahnen, insbesondere papierbahnen
CH637089A5 (de) Blaskasten zum schwebenden fuehren und/oder foerdern von bahnen oder bogen.
DE1954880B2 (de) Vorrichtung zum fuehren von laufendem materialgut durch eine behandlungsanlage
DE1474239C3 (de) Verfahren und Einrichtung zur Stabilisierung der Lage unter Wirkung eines Blasmittels schwebend geführter Warenbahnen
EP0298299B1 (fr) Dispositif pour guider des bandes sans contact direct
DE2836103C2 (de) Luftdüse für einen Düsentrockner
DE19922165C2 (de) Trockner für band- oder plattenförmiges Gut
DE2160131A1 (de) Vorrichtung zum berührungslosen Tragen und Trocknen von laufenden Materialbahnen
DE4029487A1 (de) Verfahren und vorrichtung zum fuehren einer papierbahn in der streichmaschine
EP0202561B1 (fr) Dispositif de repassage
DE69326761T2 (de) Mehrzwecksblaskasten mit düsen
WO1994004740A1 (fr) Dispositif de soufflerie pour bandes textiles
EP0723522B1 (fr) Dispositif pour le guidage en suspension dans l'air d'une bande en defilement
DE2351280B2 (de) Prallstrahltrockner für bahnförmiges Gut
EP0787964B1 (fr) Sécheur à support pneumatique, notamment du type offset
DE3822624C2 (fr)
DE3716468C2 (fr)
EP0658427B1 (fr) Dispositif de séchage
DE3942029B4 (de) Vorrichtung zum Tragen, Umlenken und Spreizen einer Bahn
DE2203621C3 (de) Vorrichtung zum Trocknen von Materialbahnen
DE2240713C3 (de) Düsentrockner für beschichtete oder bedruckte Bahnen
DE10085256B4 (de) Verfahren zum Stützen einer Bahn und Bahnstützvorrichtung
DE10352980B4 (de) Dampfblaskasten
DE2724328C2 (de) Trockner für Warenbahnen, insbesondere im Rollenoffset und Schwebedüse, insbesondere zur Verwendung in dem Trockner

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19890315

17Q First examination report despatched

Effective date: 19901025

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19911009

Ref country code: BE

Effective date: 19911009

Ref country code: SE

Effective date: 19911009

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19911009

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 19911009

REF Corresponds to:

Ref document number: 68221

Country of ref document: AT

Date of ref document: 19911015

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3865381

Country of ref document: DE

Date of ref document: 19911114

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19920622

Ref country code: AT

Effective date: 19920622

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Effective date: 19920630

Ref country code: LI

Effective date: 19920630

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

26N No opposition filed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19920622

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930226

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930302

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST