EP1540078A1 - Einrichtung und verfahren zur herstellung und/oder behandlung einer faserstoffbahn - Google Patents
Einrichtung und verfahren zur herstellung und/oder behandlung einer faserstoffbahnInfo
- Publication number
- EP1540078A1 EP1540078A1 EP03795022A EP03795022A EP1540078A1 EP 1540078 A1 EP1540078 A1 EP 1540078A1 EP 03795022 A EP03795022 A EP 03795022A EP 03795022 A EP03795022 A EP 03795022A EP 1540078 A1 EP1540078 A1 EP 1540078A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- curl
- nozzles
- influence
- influencing
- nozzle
- 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
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
- D21G1/0093—Web conditioning devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G7/00—Damping devices
Definitions
- the invention relates to a device and a method for producing and / or treating a fibrous web, in particular paper or cardboard web.
- water is applied evenly across the width of the paper by means of nozzles. It is essential that the water is applied on one side or at least in different amounts to the two sides when subjected to pressure from both sides. This specifically influences the change in swelling of the fibers between the top and bottom of the web during the drying process and corrects the curl behavior accordingly.
- the water can be applied via nozzles or via special roller applicators.
- care must also be taken to ensure the best possible moisture cross profile. This is achieved by means of sectionally controllable nozzle dampers.
- the maximum application quantity per nozzle is in a range from 12 to 15 l / h with a droplet diameter according to Sauter ⁇ 100 ⁇ m.
- the so-called Sauter diameter is an average diameter that is used for spray characterization. A drop of this diameter has the same volume-to-surface ratio as the entire (spray) sample, i.e. the sum of all surfaces and volumes.
- the curl is corrected, i.e. the flatness of the paper by means of a two-row arrangement of the drying cylinders at least at the end of the drying section or by applying steam on the underside of the paper after the drying section and / or by applying additional water to the underside of the paper web.
- the paper sometimes has a relatively poor flatness.
- the invention has for its object to provide an improved device and an improved method of the type mentioned, in which the aforementioned disadvantages are eliminated.
- moisture cross profile two requirements or functions (moisture cross profile, flatness) are therefore combined or implemented in a single unit. It is thus possible, for example, to equalize the moisture cross profile of the fibrous web while at the same time minimally rewetting the web over the entire width to ensure the flatness of the fibrous web. Reliable moisture cross-profile control and correction of the flatness is also possible at higher machine speeds, i.e. with a short dwell time in the area of
- the device according to the invention is also particularly suitable for papers with a high basis weight.
- moisture cross profile, curl can be performed not only in parallel, but also independently of one another, despite the use of a single humidification unit.
- the humidification unit comprises a nozzle humidifier which serves both to influence the moisture cross profile and to influence the curl of the fibrous web.
- the nozzle moistener can be equipped with pneumatic atomizing nozzles.
- the nozzle moistener is advantageously provided with two-substance nozzles. These can, for example, have such a structure as is described in DE 199 49 236 A. It is therefore possible in particular to use two-substance spray nozzles charged with a gaseous medium and a liquid medium.
- the average throughput of the nozzles of the nozzle moistener is preferably> 15 l / h.
- the mean throughput of the nozzles of the nozzle moistener can be in particular in a range from 15 l / h to 30 l / h and preferably in a range from 15 l / h to 20 l / h.
- the average throughput of all nozzles should therefore be as large as possible or equal to 15 l / h.
- the average nozzle throughput is defined by the ratio of the total throughput of the humidification unit to the total number of nozzles.
- the droplet diameter according to Sauter is independent of the respective nozzle throughput ⁇ 100 ⁇ m in each spray jet generated by the moistening unit.
- the nozzle throughput is greater than in the known nozzle humidifiers, since the throughput is made up of a proportion Curl influence and a portion of the moisture cross profile influence composed.
- the mean nozzle throughput is kept at least substantially constant during operation.
- the mean nozzle throughput can be kept constant during the production of a certain type of paper in order not to subject the amount of water to be evaporated in the subsequent drying to any temporal fluctuations, as a result of which stable final dry contents in the paper web are achieved over time.
- a respective nozzle throughput can be composed in particular of a portion for influencing the moisture cross profile and a portion for influencing the curl.
- the portion provided as a base load for influencing the curl can be in particular in a range between 10 to 50% of the total nozzle throughput or can be adjustable.
- the portion of the curl influencing which is provided as the base load can preferably be set in different sections across the web width. In principle, however, the portion of the curl influencing that is provided as the base load can also be constant over the web width.
- the capacity of the humidification device is preferably chosen to be large enough that, despite a base load for the curl, there is sufficient potential for influencing the moisture cross profile. It is also particularly advantageous if the proportion of the mean throughput of the nozzles that affects curl is> 2 1 / h, in particular> 3 1 / h and preferably> 4 1 / h.
- the moistening unit preferably comprises a plurality of rows of nozzles each extending transversely to the web running direction.
- a plurality of rows of nozzles each extending transversely to the web running direction.
- two or four rows of nozzles can be provided.
- five, six, seven or eight rows of nozzles can also be provided, preferably six or eight rows of nozzles being provided.
- all of the nozzles of the nozzle moistener can serve both to influence the moisture cross profile and to influence the curl of the fibrous web at the same time.
- some of the nozzles of the nozzle humidifier serve exclusively to influence the moisture cross profile and part of the nozzles exclusively to influence the curl.
- part of the nozzles of the nozzle humidifier serve both to influence the
- Moisture cross profile as well as influencing the curl of the fibrous web and part of the nozzles exclusively influencing the curl is also conceivable, for example, in which some of the nozzles of the nozzle humidifier serve both to influence the moisture cross profile and also to influence the curl of the fibrous web, and some of the nozzles are used exclusively to influence the moisture cross profile.
- the amount of spray emitted by the humidification unit to influence the moisture cross-profile can be adjusted in the transverse direction, preferably sectionally separately.
- Each individual nozzle is preferably adjustable separately.
- At least one control circuit and / or at least one control circuit is advantageously provided, at least for influencing the moisture cross profile.
- the regulation or control of the influencing of the curl takes place as a function of the average web moisture and in particular the size of the curl determined in the laboratory test.
- the moistening unit is advantageously arranged in an area in which the dry content of the fibrous web is> 80% and preferably> 85%.
- the sectioning or zoning is preferably variable.
- the zone width can be varied in a range between 25 and 100 mm.
- the humidification unit is preferably arranged below the lower rollers within a single-row dryer group.
- the humidification unit is installed on the last suction roller of the last or penultimate drying group L0.
- the curl or the flatness and the surface properties of the fibrous web are additionally influenced
- the humidification unit according to the invention can therefore in particular also in combination with a in front of or within a smoothing device following the dryer section to further improve the flatness and surface quality of the
- the device according to the invention can be used with particular advantage in a papermaking process with complete or partial one-sided drying of the paper or cardboard or with one-sided surface treatment, for example gluing or brushing, or with an asymmetrical layer structure.
- the object specified above is also achieved by a process for producing and / or treating a fiber Material web, in particular paper or cardboard web, in which a common moistening unit is used to influence the moisture cross profile and to influence the curl of the fibrous web, by means of which the moisture cross profile and the curl can be influenced separately from one another.
- Figure 1 is a schematic partial representation of a paper machine with a simultaneous both influencing the moisture cross profile and influencing the
- FIG. 2 is a diagram in which the nozzle throughput over the
- Figure 3 is a diagram in which an exemplary setting or target profile of the nozzles is indicated.
- FIG. 1 shows a schematic partial illustration of a device 10 for producing and / or treating a fibrous web 12, which can in particular be a paper or cardboard web.
- the device 10 can therefore in particular be a paper machine.
- FIG. 1 shows a part of the dryer section 14 and a winding device 16 in which the fibrous or paper web 12 is wound up.
- a humidification unit 22 which serves both to influence the moisture cross profile and to influence the curl of the fibrous web 12, is provided, which has a control and / or Control unit 24 is assigned.
- the moistening unit 22 can in particular comprise a nozzle moistener which serves both to influence the moisture cross profile and to influence the curl of the fibrous web 12.
- the moistening unit 22 has a plurality, in the present case, for example, four rows of nozzles 26 which extend transversely to the web running direction L and through which the nozzles 26 Suction roller 18 guided fibrous web 12 can be acted upon accordingly.
- all of the nozzles of the nozzle moistener can simultaneously serve both to influence the moisture cross profile and to influence the curl of the fibrous web.
- some of the nozzles of the nozzle humidifier serve exclusively to influence the moisture cross profile and part of the nozzles exclusively to influence the curl.
- some of the nozzles of the nozzle humidifier serve both to influence the moisture cross profile and also to influence the curl of the fibrous web, and some of the nozzles are used exclusively to influence the curl.
- Such an embodiment is also conceivable, for example, in which a part of the nozzles of the nozzle moistener serves both to influence the cross-moisture profile and to influence the curl of the fibrous web and a part of the nozzles is used exclusively to influence the cross-moisture profile.
- the moistening unit 22 formed in the present case by a nozzle moistener can be provided in particular with pneumatic atomizing nozzles 26 and, for example, with two-substance nozzles 26, as described in DE 199 49 236 A. In principle, however, any other types of nozzle can also be used.
- the average throughput of the nozzles 26, determined from the total throughput of the nozzles 26 divided by their number, is preferably> 15 l / h.
- the droplet diameter according to Sauter is independent of the respective nozzle throughput ⁇ 100 ⁇ m in each spray jet 28 generated by the nozzles 26.
- a traversing measuring device 28 is provided, which delivers individual measured values x for the web moisture and corresponding snapshots of the moisture cross profile to the control and / or regulating unit 24.
- valves 30 in lines 32 leading to the nozzle rows 26 are appropriately controlled or regulated.
- the spray quantities emitted by the relevant rows of nozzles 26 to influence the moisture cross profile can preferably be set to be sectionally separate when viewed in the transverse direction.
- the moisture cross profile can be set separately for each relevant row of nozzles.
- the control and / or regulating unit 24 can comprise one or more regulating and / or control circuits 34.
- the control and / or regulating unit 24 preferably again comprises one or more regulating and / or control circuits 36. one or more control and / or regulating circuits superior to these can also be provided.
- a control and / or regulation comprising both functions (moisture cross profile, curl) is conceivable.
- valves 26 of the remaining valve rows serving to influence the cross-sectional moisture profile are acted upon by the relevant local moisture values i.
- a moisture cross profile control can take place.
- control is also conceivable.
- both a control and a regulation are basically conceivable. 14
- the manipulated variable for influencing the curl can in principle also be set manually.
- the average mean nozzle throughput can be kept at least substantially constant.
- the diagram according to FIG. 2 shows the nozzle throughput over the web width.
- a respective nozzle throughput (volume / time) V'Ges (x) is composed of a portion V'FQP (X) for influencing the moisture cross profile and a portion VOuri for influencing the curl.
- the V'curi component for influencing curl forms a kind of base load, to which the variable component V'FQ P is added for influencing the moisture cross profile.
- the part of the curl influencing which is provided as the base load can be set to be constant or different in sections depending on the web width.
- a setting or target profile of the nozzles is indicated purely by way of example.
- the area a) indicates the basic load for the curl and b) the area for the profiling. If several rows of nozzles are provided, they can have identical setting or
- Target profiles or have different setting or target profiles.
Landscapes
- Paper (AREA)
- Treatment Of Fiber Materials (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10241944 | 2002-09-10 | ||
| DE10241944A DE10241944A1 (de) | 2002-09-10 | 2002-09-10 | Einrichtung und Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn |
| PCT/EP2003/050337 WO2004025023A1 (de) | 2002-09-10 | 2003-07-28 | Einrichtung und verfahren zur herstellung und/oder behandlung einer faserstoffbahn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1540078A1 true EP1540078A1 (de) | 2005-06-15 |
| EP1540078B1 EP1540078B1 (de) | 2010-09-08 |
Family
ID=31724613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03795022A Expired - Lifetime EP1540078B1 (de) | 2002-09-10 | 2003-07-28 | Einrichtung und verfahren zur herstellung und/oder behandlung einer faserstoffbahn |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1540078B1 (de) |
| JP (1) | JP4514610B2 (de) |
| CN (1) | CN1681994B (de) |
| AT (1) | ATE480665T1 (de) |
| AU (1) | AU2003262541A1 (de) |
| DE (2) | DE10241944A1 (de) |
| WO (1) | WO2004025023A1 (de) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006008808A1 (de) * | 2006-02-25 | 2007-08-30 | Voith Patent Gmbh | Verfahren und Vorrichtung zum Befeuchten einer Faserstoffbahn |
| DE102008000288A1 (de) | 2008-02-13 | 2009-08-20 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Steuerung und/oder Regelung der Feuchte einer Materialbahn und Maschine zur Herstellung einer Materialbahn mit einer derartigen Vorrichtung |
| DE102010039093A1 (de) * | 2010-08-09 | 2012-02-09 | Voith Patent Gmbh | Verfahren und Vorrichtung zur Regelung der Feuchte einer Materialbahn |
| WO2015032432A1 (en) * | 2013-09-05 | 2015-03-12 | Mondi Ag | Food wrap paper and method of manufacturing same |
| CN104988787B (zh) * | 2015-07-08 | 2017-08-25 | 华南理工大学 | 一种利用真空度调节纸张水分的蒸汽装置及方法 |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3658642A (en) * | 1968-12-18 | 1972-04-25 | Beloit Corp | Method of reducing curl in making a continuous web of paper |
| JPS54151605A (en) * | 1978-05-16 | 1979-11-29 | Honshu Paper Co Ltd | Moisture conditioner for sheet material |
| JPS59141600U (ja) * | 1983-03-14 | 1984-09-21 | 日立造船富岡機械株式会社 | 抄紙機の紙の水分調節装置 |
| FI91900C (fi) | 1990-12-17 | 1994-08-25 | Valmet Paper Machinery Inc | Menetelmä paperikoneen kuivatusosalla paperin käyristymistaipumuksen vähentämiseksi ja menetelmän toteuttamiseen tarkoitettu kuivatusosa |
| US5286348A (en) * | 1991-10-16 | 1994-02-15 | Valmet Automation (Canada) Ltd. | Electronic flow modulated cross direction moisture actuator |
| FI103820B (fi) * | 1993-11-30 | 1999-09-30 | Valmet Paper Machinery Inc | Menetelmät paperirainan kuivatuksessa sekä paperikoneen kuivatusosat |
| US5592751A (en) * | 1994-11-23 | 1997-01-14 | Voith Sulzer Papiermaschinen Gmbh | Dryer section having combination of single and double tier dryer groups |
| DE19548307A1 (de) * | 1995-12-22 | 1997-06-26 | Voith Sulzer Papiermasch Gmbh | Trockenpartie |
| FI981480A7 (fi) * | 1998-06-26 | 1999-12-27 | Valmet Corp | Menetelmä paperin pintaominaisuuksien ja/tai käyristymän ja/tai kireyden ja/tai kosteuden ja/tai kireysprofiilin ja/tai kosteusprofiilin hallitsemiseksi sekä järjestely paperikoneessa paperin pintaominaisuuksien ja/tai käyristymän ja/tai kireyden ja/tai kosteuden ja/tai ... |
| DE19841768A1 (de) * | 1998-09-11 | 2000-03-16 | Voith Sulzer Papiertech Patent | Trockenpartie |
| DE19921592A1 (de) * | 1999-05-07 | 2000-11-09 | Voith Sulzer Papiertech Patent | Applikationsvorrichtung und -verfahren für eine Papiermaschine |
| FI113072B (fi) * | 1999-09-29 | 2004-02-27 | Metso Paper Inc | Menetelmä monitelakalanteria varten ja monitelakalanteri |
| DE19949236C2 (de) * | 1999-10-13 | 2003-05-08 | Lechler Gmbh & Co Kg | Zweistoff-Sprühdüse |
| DE10055999A1 (de) * | 2000-11-11 | 2002-05-23 | Voith Paper Patent Gmbh | Pressanordnung |
-
2002
- 2002-09-10 DE DE10241944A patent/DE10241944A1/de not_active Withdrawn
-
2003
- 2003-07-28 AU AU2003262541A patent/AU2003262541A1/en not_active Abandoned
- 2003-07-28 DE DE50313075T patent/DE50313075D1/de not_active Expired - Lifetime
- 2003-07-28 AT AT03795022T patent/ATE480665T1/de active
- 2003-07-28 WO PCT/EP2003/050337 patent/WO2004025023A1/de not_active Ceased
- 2003-07-28 JP JP2004535523A patent/JP4514610B2/ja not_active Expired - Fee Related
- 2003-07-28 EP EP03795022A patent/EP1540078B1/de not_active Expired - Lifetime
- 2003-07-28 CN CN03821360.5A patent/CN1681994B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004025023A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1681994A (zh) | 2005-10-12 |
| JP4514610B2 (ja) | 2010-07-28 |
| EP1540078B1 (de) | 2010-09-08 |
| WO2004025023A1 (de) | 2004-03-25 |
| DE10241944A1 (de) | 2004-03-18 |
| ATE480665T1 (de) | 2010-09-15 |
| JP2005538267A (ja) | 2005-12-15 |
| CN1681994B (zh) | 2012-05-30 |
| DE50313075D1 (de) | 2010-10-21 |
| AU2003262541A1 (en) | 2004-04-30 |
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