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EP0640716A2 - Aménagement pour guider une bande fibreuse dans un séchoir - Google Patents

Aménagement pour guider une bande fibreuse dans un séchoir Download PDF

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Publication number
EP0640716A2
EP0640716A2 EP94109372A EP94109372A EP0640716A2 EP 0640716 A2 EP0640716 A2 EP 0640716A2 EP 94109372 A EP94109372 A EP 94109372A EP 94109372 A EP94109372 A EP 94109372A EP 0640716 A2 EP0640716 A2 EP 0640716A2
Authority
EP
European Patent Office
Prior art keywords
suction box
arrangement according
web
support belt
longitudinal sealing
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
EP94109372A
Other languages
German (de)
English (en)
Other versions
EP0640716B1 (fr
EP0640716A3 (fr
Inventor
Peter Kahl
Karl-Heinz Klein
Helmut Grimm
Wolfgang Müller
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.)
Voith Patent GmbH
Original Assignee
JM Voith 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 JM Voith GmbH filed Critical JM Voith GmbH
Priority to BR9402703A priority Critical patent/BR9402703A/pt
Priority to CA 2129597 priority patent/CA2129597A1/fr
Priority to FI943654A priority patent/FI943654A/fi
Priority to JP21517994A priority patent/JPH07167558A/ja
Priority to US08/303,654 priority patent/US5515619A/en
Publication of EP0640716A2 publication Critical patent/EP0640716A2/fr
Publication of EP0640716A3 publication Critical patent/EP0640716A3/fr
Application granted granted Critical
Publication of EP0640716B1 publication Critical patent/EP0640716B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21F5/02—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
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the invention relates to an arrangement for guiding a fibrous web to be dried, together with a porous support band by a drying device in detail with the features specified in the preamble of claim 1.
  • the air guide box is designed as a suction box.
  • a preferably mechanical deflection device which is known from DE-PS 3706542, the air boundary layer brought up by the sieve or support belt should not get in the direction of the deflection roller, but should be removed immediately upwards between the drying cylinders, so that the vacuum is more energy-efficient Suction box can be kept low.
  • This construction has the disadvantage that there is only an insufficient seal between the space between the outer wall of the suction box and the support belt and the deflecting roller, in particular between the drain gusset and suction chamber of the suction box, so that false air is sucked in and thus the negative pressure that the paper web should hold on the support belt, is lifted, or even excess pressure is generated.
  • the aim is, as far as possible, to dispense with direct suction of air directly from the inside of the deflection roller, or to do so entirely.
  • the invention has for its object to improve an arrangement for guiding a fibrous web to be dried in a drying device so that the web to be dried is held on the support belt better than before and yet with as little energy expenditure as possible.
  • at least one of the two gussets should be better sealed against the supply of false air, even if the external suction box is made inaccurately and / or bends.
  • the part of the deflecting roller shell which is free from the supporting band can be sealed in a very simple manner, so that the sucking in of false air is prevented.
  • the use of a doctor blade as a sealing strip has the advantage that the sealing point can be located at a relatively short distance from the point where the screen belt runs and / or runs off the deflection roller. Surprisingly, it was found in tests that - despite the contact of the sealing strips on the deflection roller - there were no signs of wear on the sealing strips. This applies even if the suction box has manufacturing inaccuracies and / or bends. Even when the suction box bends, the resiliently arranged sealing strips always remain in gentle contact with the deflecting roller over their entire length, so that a sufficient sealing effect is always maintained.
  • a scraper-like blade is also known from DE utility model G 9113542.7. This so-called (removal scraper) is also used to clean the outer surface and, if necessary, to remove a paper web that runs up to the scraper blade.
  • the doctor blade is freely supported and clamped only at its ends, on one side, for example by a screw, and on the other side by a spring, so that the blade can expand freely and vibrations are avoided.
  • the blade can be made of plastic. It is a commercially available component and therefore easier to manufacture and assemble than the longitudinal sealing strips which are known from the prior art.
  • two longitudinal sealing strips according to the invention are preferably provided, namely one in the overflow gusset and one in the outflow gusset.
  • the longitudinal sealing strip according to the invention can be omitted in the relevant gusset (the overrun or the gusset) or replaced by a conventional felt sealing strip.
  • the longitudinal sealing strip extends approximately tangentially to the roll shell of the deflecting roller, the outer wall of the suction box and the outer surface of a longitudinal sealing strip form a relatively smooth surface with one another, which is free of steps or edges. This avoids the risk of paper scraps getting caught.
  • the arrangement according to the invention will be able to be arranged above all in the area between two drying cylinders of a single-row drying group and having only a single support belt.
  • the arrangement according to the invention at the end of such a drying group, behind the last drying cylinder.
  • the support belt with the paper web runs to a web transfer point at which the paper web is detached from the support belt and e.g. is transferred to the support belt of a subsequent drying group.
  • the roller shell 10a has radially continuous perforations, ie bores 13.
  • circumferential grooves that intersect the bores 13 can also be machined into the outer surface of the roll shell.
  • a support belt 15 runs from the first drying cylinder 11 on a tangential, straight path to the deflecting roller 10 and from there to the second drying cylinder 12.
  • the paper web located on the outside of the support belt 15 and in direct contact with the drying cylinders is not shown in FIGS. 1-3 for reasons of clarity.
  • An external suction box 14 is provided so that the paper web to be dried remains securely in contact with the support belt 15 outside the cylinder wrapping zones, even at high working speeds (approx. 1500 m / min).
  • This suction box is located in a so-called pocket, which is delimited by the cylinders 11, 12, the support belt 15 and the deflection roller 10.
  • the underside of the paper web comes into contact with the drying cylinders 11, 12 and the top of the paper web comes into contact with the support belt 15.
  • the deflecting roller 10 is predominantly located above the drying cylinders.
  • the drying cylinders 11, 12 could not, as shown, be arranged horizontally next to each other, but vertically or obliquely one above the other.
  • the suction box 14 has a first outer wall 17 which extends from the cylinder 11 to the deflection roller 10 along the path of the support belt 15.
  • the deflection device 16 is designed as a squeegee because only mechanical means (squeegees) need be used to deflect the air.
  • the deflection device 16 designed as a scraper bar can be designed to be pivotable. When swiveled up (paper machine at a standstill) you can pull in a new support band through the opening formed in this way.
  • This bar 16 can be made of plastic or, for example. be formed from a strip of felt.
  • An air suction duct 18, which is preferably tubular, runs through the suction box 14 in the longitudinal direction. This extends at least one of the two ends of the suction box 14 beyond its end wall 19, as can be seen in FIG. 4.
  • the air suction channel 18 has a plurality of suction openings 20.
  • a partition 33 which in the preferred embodiment is a tubular duct, in the air suction duct 18 already mentioned, in order to create a suction duct which alone sucks the edge zone R indicated in FIG. 4.
  • the suction is carried out with the above-mentioned suction fan, not shown in FIG. 3.
  • the air suction channel 18 is at the same time the supporting element of the suction box 14.
  • the air suction channel 18, also referred to as a so-called support tube, is received in a support 30 which is connected to the bearing housing 31 for the deflecting roller 10.
  • first outer wall 17 of the suction box extends along the path of the support belt 15.
  • Support band and outer wall are at least approximately parallel to each other.
  • the first wall 17 slightly inclined relative to the support band, so that the support band 15 and the first Wall diverge slightly from each other. This can favor the creation of the negative pressure in the gap between the support belt and the first wall, so that the paper web remains on the support belt 15 in this area as well.
  • the suction box 15 also has a second wall 26 which, like the wall 17, can also run parallel to the screen belt, but also somewhat diverging from it.
  • Both walls 17 and 26 tangentially enclose the support tube 18.
  • An upper chamber 34 has thereby been created above this.
  • Fig. 2 it is indicated that the air extracted from the interior of the suction box, in particular the air extracted from the air suction channel 18, is blown back into this upper chamber and flows out through an air blowing opening 35. This is located in the area of the run-up point, ie where the paper web with the support belt 15 runs onto the second drying cylinder 12.
  • the blowing direction through the air blowing opening 35 is at least approximately tangential to the jacket of the second drying cylinder.
  • a blowing air guide wall 36 is attached to the air blowing opening 35 (see FIG. 2).
  • a lower outer wall 21 of the suction box 14 is provided below the support tube or air suction duct 18. Under the outer wall 21 there are brackets 40 for additional lateral seals 25 (for example by felts) against false air. In addition, end seals (e.g. felts) not shown in FIGS. 1 to 3 may also be present on the outer wall 17.
  • the lower outer wall 21 runs along the free peripheral part of the deflection roller 10 and generally has a plurality of central openings 22. From here, the negative pressure propagates through the holes 13 of the deflecting roller 10 running past it, into the interior of the deflecting roller 10. From here, the negative pressure continues to implant into the holes 13 covered by the circumferential support belt 15 and the paper web. whereby the paper web is safely sucked onto the support belt 15 in this area.
  • two longitudinal sealing strips 28 u are on the underside of the suction box 14. 29 fastened, each with a sealing strip protruding into one of the gussets (longitudinal sealing strip 28 protrudes into the overrun gusset 23, longitudinal sealing strip 29 protrudes into the drain gusset 24).
  • the sealing strips are in the manner of a doctor blade, for example. made of plastic and resiliently held on the suction box 14. They are at least approximately tangential to the roller jacket 10a.
  • Fig. 1 From Fig. 1 it can be seen that the two longitudinal sealing strips 28 u. 29 are fastened to the suction box 14 by means of a flat holder 37 (seen in cross section). (A deviating arch-shaped holder 37a can be seen in FIG. 2.)
  • the flat holder 37 is arranged on the suction box 14 in such a way that it forms an at least approximated smooth surface with the adjoining outer wall 17 and / or 26. This has the great advantage that there are no steps and edges and therefore no paper residues can adhere to them.
  • This smooth surface is at least approximately parallel to the essentially straight path of the support belt 15. However, it can also form a small angle with this.
  • circumferential seals 25 are provided on the end walls 19 of the suction box 14 (see FIG. 4).
  • seals are arranged at a very short distance from the lateral surface of the deflecting roller 10, so that the rotating roller jacket 10a can also slide on these seals, which are intended to prevent the sucking in of false air.
  • the suction box 14 itself can, if necessary, be pivoted away about a point P in order to thereby remove it somewhat from the first drying cylinder 11.
  • the pivoting can, for. B. if the squeegee 16 is not pivoted up, then be necessary if a new support belt 15 must be pulled in when the machine is at a standstill, or any malfunction occurs.
  • the suction box 14 has, at one of its two ends, as shown in FIG. 4, in the area of the web edge strip used for threading the web, an edge zone R delimited by means of an intermediate wall 38, which at times can only be connected to the vacuum wave.
  • the deflecting roller 10 in the area of the above. and edge zone R of the suction box shown in FIG. 4 also an edge zone which is separated from the rest of the roller interior by an intermediate wall 39 rotating with roller shell 10a.
  • a valve (flap) 41 is arranged in the already mentioned tubular channel 33, preferably in the area outside the suction box 14, so that a drive for actuating the valve can easily be arranged on the outside of the suction channel 18. If the valve is closed, said edge zone is suctioned off only by connection to the vacuum source.
  • a d according to the invention is only in the gusset 24.
  • a conventional felt sealing strip 28a is provided in the overrun gusset 23, which extends (seen in cross section) less far into the gusset. This creates a slightly higher vacuum in the space between the outer wall 17 and the straight path of the support belt 15 than in the embodiment according to FIG. 1.
  • FIG. 3 The reverse is shown in FIG. 3.
  • a longitudinal sealing strip 28 mm according to the invention is only present in the overflow gusset 23, while a felt sealing strip 29a is provided in the outflow gusset 24.

Landscapes

  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP94109372A 1993-08-06 1994-06-17 Aménagement pour guider une bande fibreuse dans un séchoir Expired - Lifetime EP0640716B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR9402703A BR9402703A (pt) 1993-08-06 1994-08-05 Arranjo mecânico para guiar uma folha de massa fibrosa a ser secada
CA 2129597 CA2129597A1 (fr) 1993-08-06 1994-08-05 Systeme pour guider une bande de papier a secher
FI943654A FI943654A (fi) 1993-08-06 1994-08-05 Järjestely kuivattavan kuituaineradan ohjaamiseksi
JP21517994A JPH07167558A (ja) 1993-08-06 1994-08-05 乾燥すべき繊維材料リボンを案内する装置
US08/303,654 US5515619A (en) 1993-08-06 1994-09-09 Flexibly mounted sealing strips of a vacuum roll for a web dryer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10276693A 1993-08-06 1993-08-06
US102766 1993-08-06

Publications (3)

Publication Number Publication Date
EP0640716A2 true EP0640716A2 (fr) 1995-03-01
EP0640716A3 EP0640716A3 (fr) 1996-01-31
EP0640716B1 EP0640716B1 (fr) 2000-11-02

Family

ID=22291576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94109372A Expired - Lifetime EP0640716B1 (fr) 1993-08-06 1994-06-17 Aménagement pour guider une bande fibreuse dans un séchoir

Country Status (4)

Country Link
EP (1) EP0640716B1 (fr)
AT (1) ATE197329T1 (fr)
DE (1) DE59409573D1 (fr)
ES (1) ES2152275T3 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613809U1 (de) * 1996-08-09 1996-09-26 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Vorrichtung zum Trocknen einer Faserstoffbahn
DE19714758A1 (de) * 1997-04-10 1998-10-15 Voith Sulzer Papiermasch Gmbh Vorrichtung zum Führen einer Materialbahn
EP0872592A2 (fr) * 1997-04-17 1998-10-21 Voith Sulzer Papiermaschinen GmbH Dispositif pour le traitement d'une bande fibreuse et système assurant l'étanchéité d'une telle installation
US6192597B1 (en) 1997-04-17 2001-02-27 Voith Sulzer Papiermaschinen Gmbh Device for treating a fibrous pulp web as well as a sealing device for a device of this kind
US6311921B1 (en) 1998-10-22 2001-11-06 Voith Sulzer Papiertechnik Patent Gmbh Winding device and method for winding web material
EP1479823A1 (fr) * 2003-05-06 2004-11-24 Voith Paper Patent GmbH Dispositif d'application directe de produit fluide ou pateux sur un substrat défilant
EP2161372A3 (fr) * 2008-09-05 2011-03-09 Voith Patent GmbH Section de séchage
DE102015207284A1 (de) 2015-04-22 2016-10-27 Voith Patent Gmbh Dichtungselement und Dichtungseinrichtung für eine Bahnstabilisierungseinrichtung
CN111578687A (zh) * 2020-05-31 2020-08-25 黄碧娴 一种用于纺织的染色烘干机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI120005B (fi) 2001-03-06 2009-05-29 Metso Paper Inc Sovitelma paperikoneen kuivatusosalla

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3828743A1 (de) * 1987-09-02 1989-03-23 Valmet Paper Machinery Inc Verfahren und vorrichtung in einer einsieb-trockengruppe einer papiermaschine
DE3910600A1 (de) * 1989-04-01 1990-10-04 Voith Gmbh J M Ein-sieb-trockengruppe
DE4314475A1 (de) * 1993-05-03 1993-12-23 Voith Gmbh J M Anordnung zum Führen einer zu trocknenden Bahn
DE4401378A1 (de) * 1994-01-19 1994-06-01 Voith Gmbh J M Trockenpartie für eine Papiermaschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3828743A1 (de) * 1987-09-02 1989-03-23 Valmet Paper Machinery Inc Verfahren und vorrichtung in einer einsieb-trockengruppe einer papiermaschine
DE3910600A1 (de) * 1989-04-01 1990-10-04 Voith Gmbh J M Ein-sieb-trockengruppe
DE4314475A1 (de) * 1993-05-03 1993-12-23 Voith Gmbh J M Anordnung zum Führen einer zu trocknenden Bahn
DE4401378A1 (de) * 1994-01-19 1994-06-01 Voith Gmbh J M Trockenpartie für eine Papiermaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613809U1 (de) * 1996-08-09 1996-09-26 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Vorrichtung zum Trocknen einer Faserstoffbahn
US5860223A (en) * 1996-08-09 1999-01-19 Voith Sulzer Papiermaschinen Gmbh Device for drying a web
DE19714758A1 (de) * 1997-04-10 1998-10-15 Voith Sulzer Papiermasch Gmbh Vorrichtung zum Führen einer Materialbahn
EP0872592A2 (fr) * 1997-04-17 1998-10-21 Voith Sulzer Papiermaschinen GmbH Dispositif pour le traitement d'une bande fibreuse et système assurant l'étanchéité d'une telle installation
EP0872592A3 (fr) * 1997-04-17 1999-10-13 Voith Sulzer Papiermaschinen GmbH Dispositif pour le traitement d'une bande fibreuse et système assurant l'étanchéité d'une telle installation
US6192597B1 (en) 1997-04-17 2001-02-27 Voith Sulzer Papiermaschinen Gmbh Device for treating a fibrous pulp web as well as a sealing device for a device of this kind
US6311921B1 (en) 1998-10-22 2001-11-06 Voith Sulzer Papiertechnik Patent Gmbh Winding device and method for winding web material
EP1479823A1 (fr) * 2003-05-06 2004-11-24 Voith Paper Patent GmbH Dispositif d'application directe de produit fluide ou pateux sur un substrat défilant
EP2161372A3 (fr) * 2008-09-05 2011-03-09 Voith Patent GmbH Section de séchage
DE102015207284A1 (de) 2015-04-22 2016-10-27 Voith Patent Gmbh Dichtungselement und Dichtungseinrichtung für eine Bahnstabilisierungseinrichtung
DE102015207284B4 (de) * 2015-04-22 2021-05-27 Voith Patent Gmbh Dichtungselement und Dichtungseinrichtung für eine Bahnstabilisierungseinrichtung
CN111578687A (zh) * 2020-05-31 2020-08-25 黄碧娴 一种用于纺织的染色烘干机

Also Published As

Publication number Publication date
ES2152275T3 (es) 2001-02-01
ATE197329T1 (de) 2000-11-15
EP0640716B1 (fr) 2000-11-02
EP0640716A3 (fr) 1996-01-31
DE59409573D1 (de) 2000-12-07

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