EP1960594A1 - Bahnüberwachung - Google Patents
BahnüberwachungInfo
- Publication number
- EP1960594A1 EP1960594A1 EP06819113A EP06819113A EP1960594A1 EP 1960594 A1 EP1960594 A1 EP 1960594A1 EP 06819113 A EP06819113 A EP 06819113A EP 06819113 A EP06819113 A EP 06819113A EP 1960594 A1 EP1960594 A1 EP 1960594A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suction
- web
- zones
- fibrous web
- vacuum
- 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
Links
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
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0009—Paper-making control systems
- D21G9/0036—Paper-making control systems controlling the press or drying section
Definitions
- the invention relates to a method and a device for web monitoring in a machine for producing and / or finishing a paper, board, tissue or another fibrous web, in which the fibrous web, supported by an air-permeable belt, via at least one hot air hood with hot air is applied, wherein the band is sucked on the, the fibrous web opposite side before and / or during and / or after the H strictlyluftbeetzschlagung.
- the function of the optical sensors is easily affected by contamination.
- the object of the invention is therefore to better and safely monitor the web guide of the fibrous web.
- the object was achieved with regard to the method in that the suction takes place via one or more suction devices in several separate suction zones, wherein the negative pressure is detected in at least two suction zones via at least one respective vacuum sensor and the measured values of the vacuum sensors are fed to a control unit.
- the evaluation of two suction zones via the negative pressure considerably improves the safety of the web monitoring. If it comes to a demolition or lifting of the fibrous web or an edge of the fibrous web, so the negative pressure in the no longer or only insufficiently covered by the fibrous web suction zone significantly reduced. Air is thereby increasingly sucked through the belt in the suction device, which has the negative pressure reduction.
- the web monitoring should be applied at a normal vacuum level of at least 2000 Pa in the suction zones in relation to the surroundings.
- a lift off of a web edge or a demolition usually leads to a lowering of the vacuum level by 1000 Pa, which can be detected by the vacuum sensors relatively easily and safely.
- the drying unit and the suction devices themselves it may be advantageous if at least two suction zones are spaced apart from each other and / or at least two suction zones are immediately adjacent. Likewise, it may be advantageous if the suction zones are formed by only one suction device or by a plurality of suction devices.
- At least one vacuum sensor within the suction device and / or in the suction channel and / or at least one vacuum sensor between the belt and the suction device is arranged.
- the hot air blowing should be deactivated.
- the suction takes place via one or more suction devices in several separate suction zones, wherein the negative pressure is detected in at least two suction zones via at least one vacuum sensor and the vacuum sensors are connected to a control unit.
- the free side of the fibrous web is blown with hot air.
- the cover of the band falls away through the fibrous web.
- thermal damage of the tape may occur.
- a plurality of suction devices are arranged next to one another in the web running direction and / or transversely to the web running direction.
- each suction device forms only one suction zone or at least one suction device a plurality of suction zones.
- At least one suction device can be formed by an evacuated roll, which is wrapped by the belt and the outer fibrous web.
- roller is aspirated via a suction box arranged in the non-looped region, it can also be advantageous for simplifying the measuring arrangement if at least one vacuum sensor is arranged in the suction box.
- At least one suction device can also be formed by a suction box, on which the strip is guided along at a distance.
- Figure 1 a schematic cross section through a drying unit with
- Hot air hoods and Figure 2 another design of the drying unit.
- the fibrous web 1 is guided by an air-permeable belt 8,9,23 through a drying unit.
- the negative pressure of these suction devices 2, 3, 16, 17, 20 can be used to detect a break-off.
- the suction devices 2, 3, 16, 17, 20 absorb so much false air through the band 8, 9, 23 that there is a marked decrease in the low-pressure level, i. more than 1000 Pa comes.
- the fibrous web 1, together with the band 8, 9, is successively guided over two suction devices 2, 3 in the form of evacuated rolls.
- rollers are thereby sucked from the outside via a suction box 6 arranged in the non-wrapped peripheral area.
- the fibrous web 1 is transferred from a belt 11 of an upstream machine unit to an air-permeable transfer belt 10, wherein the transfer of a looped by the transfer belt 10 Saugleitwalze 12 is supported.
- This transfer belt 10 transfers the fibrous web 1 subsequently to the belt 8 of the first suction device 2.
- the fibrous web 1 After the H thoroughlyluftbeblasung the fibrous web 1 during the looping of the suction device 2 via a hot air hood 4, the fibrous web 1 is transferred to the belt 9 of the following suction device 3. Also there, the free side of the fibrous web 1 is blown by a hot air hood 5 with hot air during wrapping.
- the fibrous web 1 In the drying arrangement shown in Figure 2, the fibrous web 1 is guided meandering alternately from an air-permeable belt 23 through heated drying cylinders 14 and guide rollers 15, the belt 23, the fibrous web 1 presses against the hot surface of the drying cylinder 14.
- the belt 23 carries the fibrous web 1 over two treatment sections, in which the fibrous web 1 is subjected to hot air for drying.
- the band 23 wraps slightly around the outer fibrous web 1 a suction device 16 in the form of a suctioned by an outer suction box 18 roller.
- the belt 23 is guided by the fibrous web 1 around a suction device 17 in the form of a drawn-out roller.
- the belt 23 again wraps around the suction device 16.
- the belt 23 is guided for support via guide rollers 19.
- the suction devices 16,17 and these guide rollers 19 and between the guide rollers 19 itself are stationary suction devices 20 in the form of suction boxes, where the tape 23 passes by at a distance.
- the hot air hoods 21, 22 for H adopted constitutional purposes are located outside the area enclosed by the band 23.
- the vacuum monitoring over several suction zones in the web running direction 13 enables rapid detection and localization of a web break.
- the outer separate suction zones should have a maximum extension of 500 mm transverse to the web running direction 13.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005057638A DE102005057638A1 (de) | 2005-12-02 | 2005-12-02 | Bahnüberwachung |
PCT/EP2006/067645 WO2007062926A1 (de) | 2005-12-02 | 2006-10-23 | Bahnüberwachung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1960594A1 true EP1960594A1 (de) | 2008-08-27 |
EP1960594B1 EP1960594B1 (de) | 2009-07-22 |
Family
ID=37887741
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06819113A Not-in-force EP1960594B1 (de) | 2005-12-02 | 2006-10-23 | Bahnüberwachung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1960594B1 (de) |
CN (1) | CN101321911B (de) |
AT (1) | ATE437266T1 (de) |
DE (2) | DE102005057638A1 (de) |
WO (1) | WO2007062926A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021123077A1 (de) * | 2021-09-07 | 2023-03-09 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Verbesserung des Trocknungsprozesses in einer Papiermaschine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4980979A (en) * | 1987-02-13 | 1991-01-01 | Beloit Corporation | Vacuum roll transfer apparatus |
AT397111B (de) * | 1991-12-19 | 1994-02-25 | Andritz Patentverwaltung | Verfahren und vorrichtung zur führung von faserstoffbahnen |
FI87669C (fi) * | 1992-03-02 | 1993-02-10 | Valmet Paper Machinery Inc | Foerfarande och tork vid torkning av papper |
AT397262B (de) * | 1992-07-31 | 1994-03-25 | Escher Wyss Gmbh | Saugwalze |
SE9301512L (sv) * | 1993-05-03 | 1994-11-04 | Fibertech Ab | Sätt och torkvira vid papperstorkning |
-
2005
- 2005-12-02 DE DE102005057638A patent/DE102005057638A1/de not_active Withdrawn
-
2006
- 2006-10-23 WO PCT/EP2006/067645 patent/WO2007062926A1/de active Application Filing
- 2006-10-23 DE DE502006004341T patent/DE502006004341D1/de active Active
- 2006-10-23 EP EP06819113A patent/EP1960594B1/de not_active Not-in-force
- 2006-10-23 CN CN2006800452695A patent/CN101321911B/zh not_active Expired - Fee Related
- 2006-10-23 AT AT06819113T patent/ATE437266T1/de active
Non-Patent Citations (1)
Title |
---|
See references of WO2007062926A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE502006004341D1 (de) | 2009-09-03 |
DE102005057638A1 (de) | 2007-06-06 |
WO2007062926A1 (de) | 2007-06-07 |
CN101321911A (zh) | 2008-12-10 |
CN101321911B (zh) | 2012-11-07 |
ATE437266T1 (de) | 2009-08-15 |
EP1960594B1 (de) | 2009-07-22 |
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