EP2508675A1 - Dispositif destiné au transfert d'une bande dans une machine de fabrication ou de traitement de matériau en bande - Google Patents

Dispositif destiné au transfert d'une bande dans une machine de fabrication ou de traitement de matériau en bande Download PDF

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Publication number
EP2508675A1
EP2508675A1 EP12002281A EP12002281A EP2508675A1 EP 2508675 A1 EP2508675 A1 EP 2508675A1 EP 12002281 A EP12002281 A EP 12002281A EP 12002281 A EP12002281 A EP 12002281A EP 2508675 A1 EP2508675 A1 EP 2508675A1
Authority
EP
European Patent Office
Prior art keywords
web
nozzle
suction
flow
nozzles
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
Application number
EP12002281A
Other languages
German (de)
English (en)
Other versions
EP2508675B1 (fr
Inventor
Andreas Pesch
Bernhard Schmitz
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters GmbH
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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Publication of EP2508675A1 publication Critical patent/EP2508675A1/fr
Application granted granted Critical
Publication of EP2508675B1 publication Critical patent/EP2508675B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/04—Doctors for drying cylinders

Definitions

  • the invention relates to a device for transferring a web in a station of a web manufacturing or processing machine according to the preamble of claim 1.
  • the webs between the grooves act like a ski jump and lead the web strip away from the scraper.
  • This has serious disadvantages.
  • it can lead to the formation of a so-called double stripe.
  • the web strip is detected later by the delivery nozzles, while the strip tip already strays through the machine.
  • the direction reversal must be compensated again during the promotion of the air nozzles, resulting in a loss of efficiency.
  • centrifugal forces become effective which must increase and be balanced with higher web weight and higher web speed. Disadvantages are in this respect also the turbulence becoming stronger with the strength of the air flow.
  • Out EP 0 868 571 B1 is a drying section with at least one of the transfer of a EinfädelstMails serving nozzle device is known, which has at least two in the conveying direction of the web arranged one behind the other nozzle means.
  • the first nozzle device has individual nozzles and the downstream second nozzle device comprises slot nozzles.
  • the blowing air is guided through Vietnamese enclosuresnuten, so that the above-mentioned disadvantages occur here in the same way.
  • the object of the invention is therefore to provide a device for transferring a web in a station of a web-making or processing machine, which is simple in construction and allows safe transfer of the web at high web speeds.
  • a device for transferring the web is created, the one Gas flow, in particular blowing air, used as a driving medium, which sucks air by a pulse exchange.
  • a suction zone formed thereby acts on the edge strip, which is sucked in as a leader strip and abuts against a guide. Centrifugal forces are compensated, so that the edge strip is optimally passed through the guide. This has the consequence that a significant reduction in the pressure and in particular the volume of the supplied gas flow is possible without the edge strip tends to flutter on free routes.
  • a blowing effect is first exerted by a first gas flow on the edge strips to be transported in a first section, then a sucking effect by a suction flow and then in a final section finally again a blowing effect by a second gas flow.
  • the edge strip is carried and guided during transfer by these two gas flows.
  • the suction flow creates a negative pressure, whereby the guidance of the edge strip is stabilized, since the run of the edge strip on the guide calms down and the application to the guide device is improved.
  • the device according to the invention is robust and requires little maintenance.
  • the consumption of propellant is considerably reduced compared to known devices.
  • the mixing chambers are provided in bores of a guide plate, wherein the guide plate is arranged as a part of the guide on a holder, in particular a scraper holder.
  • the bores form flow channels in which propulsion jets of the first gas flow emerge.
  • the pressure in the flow is lower than in the mixing chambers, which are preferably under normal pressure.
  • the medium in the mixing chambers is entrained as a suction medium.
  • the mixing chambers preferably each have at least one suction opening through which air is sucked. Sucking is preferably in the cross-machine direction and at an upper side of the guide on which the edge strip is guided.
  • the suction opening may each be formed by an open rear wall of the mixing chambers or an opening in a chamber wall of the mixing chamber adjacent to the track of the edge strip.
  • the suction flow provided according to the invention can be directed in relation to a track by providing a perforated cover plate on the upper side of the guide.
  • the hole assembly preferably extends in the cross-machine direction and is disposed downstream of nozzle outlets of the first gas flow, the downstream distance being selectable depending on the grade and weight of the web.
  • the invention relates to a device for transferring a web in a station of a web-making or processing machine.
  • the web-forming machine can be designed as a paper or board machine as well as a woven or pulp machine.
  • the Fig. 1 shows a web-making machine with a dryer section 1, which upstream of a machine production process 2 and a machine production process 3 is arranged downstream.
  • the drying section 1 has a plurality of drying cylinders 4.
  • the dryer section 1 scraper or doctor blade 5, which Bruauf arrangementsbaumaschine 6 are assigned.
  • each dryer cylinder 4 is a scraper 5 and a Bahnauf arrangementsbauteil 6 assigned.
  • An edge strip 7 of a web which is considerably narrower in comparison with the actual production width, is supported by means of the web guide members 6 for transporting through the dryer section 1 and supported by gas flows.
  • the drying section 1 further comprises dryer fabrics 8 and guide rolls 10 in a known manner.
  • the drying cylinders 4 are rotatably mounted in a frame 9. Between the rotating drying cylinders 4 results in a free running distance 11 for the material web.
  • On the jacket of the drying cylinder 4 is a scraper blade 12 of the respective scraper 5 at.
  • the Scraper blade 12 is used to prevent winding of a cracked web on the drying cylinder 4 and separates when performing an edge strip 7 this from the drying cylinder 4.
  • the doctor blade 12 therefore preferably extends over the entire width of the drying cylinder 4th
  • the scraper 5 also preferably forms a holder for a web-laying component 6.
  • the scraper 5 is pivotally mounted on / with an axle 13 mounted on the frame 9.
  • the scraper blade 12 and the web-laying component 6 are therefore alignable to the respective drying cylinder 4 and the free running distance 11 between two drying cylinders 4.
  • the alignment is preferably about an axis 13 which extends in the cross-machine direction.
  • Fig. 3a shows the Bahnauf arrangementsbaumaschine 6 each comprise a device for transferring a web in a station of a web-making or processing machine, in particular for guiding the edge strip 7 of a material web.
  • an edge strip 7 is carried and guided on the free running distance 11 between two drying cylinders 4.
  • the device comprises for this purpose a guide device 14 which extends along a path of the edge strip 7 in the conveying direction L of the running section 11.
  • the guide 14 is attached to the scraper 5 and pivotally with this for alignment with the running distance 11, such as Fig. 1 shows.
  • the guide device 14 which is preferably an air guiding device, is associated with a first nozzle device 15 on the inlet side, ie adjacent to the doctor blade 12.
  • the first gas flow 17 runs essentially counter to the conveying direction L of the edge strip 7 and extends transversely to the conveying direction L and preferably in the cross-machine direction.
  • a plurality of individual nozzles 16 forms the gas flow 17, which on the edge strip 7 in his Whole width acts so that the gas flow 17 also acts on the edge region of the edge strip 7.
  • the individual nozzles 16 are arranged at a distance from one another.
  • the guide device 14 is further associated with the outlet side, a second nozzle device 18, which serves to generate a second gas flow 19, which extends substantially in the conveying direction L.
  • the jet width of the second gas flow 19 also extends transversely to the conveying direction L and preferably in the cross-machine direction.
  • the individual nozzles 16 of the first nozzle device 15 protrude into mixing chambers 20 in which the respective fluid jet 21 emerging from the individual nozzle 16 forms a propulsion jet.
  • the fluid jet 21 exits the individual nozzle 16 at the highest possible speed.
  • the mixing chamber 20 forms a cavity-shaped portion in which normal pressure prevails. At the cavity-shaped portion may be followed by a Gas.leitweg 22. This Gas Centersleitweg 22 is for example an angled or rounded depression.
  • the mixing chambers 20 and optionally the Gas arrangementleitwege 22 are arranged in a guide plate 23, which via fastening means 24 (see. Fig. 7 ) is preferably attached to the guide 14.
  • the guide plate 23 can be pierced.
  • the respective fluid jet 21 accelerates in the associated mixing chamber 20 a suction medium, which nach kitchent a suction flow 25 for controlling an air flow 26 on a Laufwegabites 27 between the two gas flows 17, 19.
  • a suction medium which nach Vietnameset a suction flow 25 for controlling an air flow 26 on a Laufwegabites 27 between the two gas flows 17, 19.
  • This suction flow 25 causes air to be sucked in at the top of the guide device 14. It is thus produced a suction zone, the acts on the edge strip by this is sucked and rests against the guide 14.
  • the centrifugal forces that would force the edge strip 7 a curved track see. Fig. 3a dashed edge strip 7 (St.dT)
  • the marginal strip 7 or strip strip is passed on optimally to the second nozzle device 18 and its (conveying) gas flow 19.
  • the suction flow 25 is, for example, according to the in Fig. 3a illustrated first embodiment of a rear wall 28 of the mixing chamber 20, a passage opening 29 is formed so that the vacuum present there nach coin calendart the suction flow 25.
  • This suction flow 25 passes through the guide device 14, which sucks the air flow 26 at the upper side of the guide device 14 via air inlet openings or suction openings 30. It thus leads to the top of the guide 14 are formed.
  • a positioning of the air inlet openings 30 between the two gas flows 17, 19 on the Laufwegabites 27 in the conveying direction L can be influenced on the application of the edge strip 7 to the guide 14.
  • the air flow 26 is thus controlled by the fact that the suction flow 25 at the top the guide 14 is present.
  • the air inlet openings 30 are preferably individual openings, which are provided in a cover plate 31.
  • the cover 31 is perforated for this purpose, for example.
  • the number of air inlet openings 30 is selectable and is not predetermined by the number of mixing chambers 20 Fig. 4 to Fig. 6 For example, twelve mixing chambers 20 and twenty-two air inlet openings 30 are provided.
  • the opening width of the air inlet openings 30 can be adjusted according to the application.
  • FIG. 3b illustrated second embodiment differs from the first embodiment described above in that the cover plate 31 is omitted.
  • the suction flow 25 inadvertently sucks in air at the upper side of the guide device 14, since the passage opening 29 of the respective mixing chamber 20 can act freely to the upper side of the guide device 14.
  • the Control of the air flow 26 in the region between the two gas flows 17, 19 is limited to a virtually free suction at the top of the guide 14, whereby Störströmept 32 can not be completely avoided, which preclude a best possible application of the edge strip 7. Nevertheless, compared with the prior art, there is a significant improvement in the guidance of the edge strip 7.
  • FIG. 3c illustrated embodiment differs from the first embodiment in that the air inlet openings are formed as suction nozzle 33 in the upper-side wall 34 of the respective mixing chamber 20.
  • the number of suction nozzle 33 then corresponds to the number of mixing chambers 20 and the number of individual nozzles 16.
  • the suction nozzle 33 form supply lines for the air flow 26, which in turn can be controlled.
  • the first nozzle device 15 which is the foremost nozzle device in the conveying direction L, comprises a feed tube 35, which forms a blowpipe, from which the individual nozzles 16 are supplied with gas, in particular air. Pressure and flow rate of the supplied gas can be set according to the application.
  • the gas flow 17 of the first nozzle device 15 preferably extends at an angle to the jacket of the drying cylinder 4. The gas flow 17 causes a gas or air film to form on the guide 14, which carries the edge strip 7 of the material web and passes on. Through the nozzle row forming individual nozzles 16 an air carpet is formed.
  • the following second nozzle device 18 has a second feed tube 36, which likewise forms a blowpipe, from which the gas stream 19, in particular an air stream, emerges.
  • the second nozzle device 18 may be formed in a known manner.
  • the second nozzle means 18 comprises a plurality of second single nozzles 37 arranged in series which are fed by the second feed pipe 36.
  • the first individual nozzles 16 and the second individual nozzles 37 are preferably designed as free jet nozzles, in particular hole nozzles.
  • the following is preferably provided.
  • the individual nozzles 37 are arranged below a cover plate 38.
  • the edge strip 7 is thereby protected from direct contact with the individual nozzles 37.
  • the individual nozzles 37 are preferably free-jet nozzles, which are formed by nozzle tubes.
  • a further row of nozzles 39 is located on the front side of the cover plate 38, which produce an air gap of an air flow 40 on the cover plate 38.
  • These further nozzles 39 are preferably designed as Coanda nozzles. As a result, the gas or air jet can be guided so that the zone of the jet outlet does not experience any direct contact with the edge strip 7.
  • the nozzles 39 may be designed as a hole or slot nozzles.
  • the Coanda design has the advantage that the single beams form a uniform air carpet very quickly.
  • the gas or air flow does not have to be particularly strong, because it does not pursue the purpose of promoting the edge strip over a long distance.
  • the individual nozzles 37 are provided.
  • the gas, in particular air flows 19, 40 connect at the end of the cover plate 38 and generate a sufficient pressure cushion.
  • the cover plate 38 preferably has a diaphragm length in the conveying direction L which is greater than a length of the individual nozzles 37 of the second nozzle device 18.
  • the gas supply via the supply pipes 35, 36 may have different pressures and be controlled accordingly.

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  • Drying Of Solid Materials (AREA)
  • Treatment Of Fiber Materials (AREA)
EP20120002281 2011-04-08 2012-03-29 Dispositif destiné au transfert d'une bande dans une machine de fabrication ou de traitement de matériau en bande Active EP2508675B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011016588A DE102011016588A1 (de) 2011-04-08 2011-04-08 Vorrichtung zum Überführen einer Bahn in einer Station einer Bahn-Herstellungs- oder Verarbeitungsmaschine

Publications (2)

Publication Number Publication Date
EP2508675A1 true EP2508675A1 (fr) 2012-10-10
EP2508675B1 EP2508675B1 (fr) 2013-07-24

Family

ID=45976041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20120002281 Active EP2508675B1 (fr) 2011-04-08 2012-03-29 Dispositif destiné au transfert d'une bande dans une machine de fabrication ou de traitement de matériau en bande

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Country Link
EP (1) EP2508675B1 (fr)
DE (1) DE102011016588A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941242A1 (de) * 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn
DE9109313U1 (de) * 1991-07-27 1991-09-26 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zum Führen einer laufenden Bahn
EP0868571B1 (fr) 1995-12-22 2001-05-23 Voith Paper Patent GmbH Train de sechage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI76142C (fi) * 1985-11-14 1988-09-09 Valmet Oy Fickventilationsfoerfarande och -anordning i en pappersmaskins maongcylindertork.
DE10115618A1 (de) * 2001-03-26 2002-10-02 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Überführen einer Bahn

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3941242A1 (de) * 1989-12-14 1991-06-20 Voith Gmbh J M Fuehrungsplatte zum einfaedeln einer bahn
DE3941242C2 (fr) 1989-12-14 1992-10-15 J.M. Voith Gmbh, 7920 Heidenheim, De
DE9109313U1 (de) * 1991-07-27 1991-09-26 J.M. Voith Gmbh, 7920 Heidenheim Vorrichtung zum Führen einer laufenden Bahn
EP0868571B1 (fr) 1995-12-22 2001-05-23 Voith Paper Patent GmbH Train de sechage

Also Published As

Publication number Publication date
DE102011016588A1 (de) 2012-10-11
EP2508675B1 (fr) 2013-07-24

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