EP0989231A2 - Régulation du profil d'humidité - Google Patents

Régulation du profil d'humidité Download PDF

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Publication number
EP0989231A2
EP0989231A2 EP99112923A EP99112923A EP0989231A2 EP 0989231 A2 EP0989231 A2 EP 0989231A2 EP 99112923 A EP99112923 A EP 99112923A EP 99112923 A EP99112923 A EP 99112923A EP 0989231 A2 EP0989231 A2 EP 0989231A2
Authority
EP
European Patent Office
Prior art keywords
fibrous web
cylinder
electromagnetic waves
electrodes
microwaves
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.)
Withdrawn
Application number
EP99112923A
Other languages
German (de)
English (en)
Other versions
EP0989231A3 (fr
Inventor
Robert Wolf
Markus Oechsle
Wolfgang Mayer
Roland Mayer
Frank Wegehaupt
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
Voith Paper Patent GmbH
Voith Sulzer Papiertechnik Patent 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 Voith Paper Patent GmbH, Voith Sulzer Papiertechnik Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP0989231A2 publication Critical patent/EP0989231A2/fr
Publication of EP0989231A3 publication Critical patent/EP0989231A3/fr
Withdrawn legal-status Critical Current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
    • D21F5/16—Drying webs by electrical heating
    • D21F5/167—Microwave heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy

Definitions

  • the invention relates to a method and the associated devices for Moisture profiling of a fibrous web to be dried, in particular a paper, Cardboard or tissue web in machines for the production and / or finishing of the same.
  • the fibrous webs are currently used for drying over heated cylinders guided. This complex process often results in an uneven distribution of the Moisture across the fibrous web. To correct this moisture cross profile certain zones additionally humidified or heated, the heating in the generally done inductively or by means of IR radiators and humidification with steam.
  • the object of the invention is therefore a method that is as simple and precise as possible and to develop at least one corresponding device for moisture profiling.
  • the object was achieved in that the fibrous web electromagnetic waves in the form of microwaves and / or high frequency waves is exposed. This is essentially due to the fact that the fibrous web is on at least one microwave transmitter and / or at least two with one High-frequency source connected electrodes of different polarity passed becomes.
  • the high-frequency range lies approximately in the range between 10 and 300 MHz and the Microwave range between 300 MHz and 30 GHz. To ensure a uniform effect on the fibrous web, the Field energy of the electromagnetic waves across the fibrous web should also be possible be evenly distributed.
  • the method is used in the areas where the fibrous web unites Has a dry content between 60 and 95%. On the one hand, these areas do not have to too much water to be heated and on the other hand is sufficient moisture to Absorption of the electromagnetic waves is present.
  • the fibrous web is also supported in the area of electromagnetic waves. This stabilizes the Run of the fibrous web and reduces the risk of tearing. For this, the The fibrous web is guided over a rotating cylinder.
  • the drying of the fibrous web at least predominantly by electromagnetic waves occur. Most of the time, however, the drying on conventional way, i.e. for example via heated cylinders, so that electromagnetic waves essentially only to compensate for Differences in moisture serve across the fibrous web.
  • One or more waveguides are preferably used as the microwave transmitter Application, which are each connected to at least one microwave source and at least transversely to the fibrous web as evenly distributed as possible should. The result is a relatively even distribution of field energy Microwaves across the fibrous web.
  • the fibrous web should have a microwaves rotating cylinder.
  • the jacket of the cylinder or an outer coating of this jacket consist of a material that the Microwaves absorbed worse than the fibrous web. This is suitable for example Teflon.
  • the thickness of the coating should be between 5 and 150 mm, are preferably between 10 and 50 mm.
  • the course of the fibrous web can also be used alone or in addition to at least one sieve is supported, the material of which the microwaves are worse than the fibrous web absorbs.
  • the electrodes should be in the form of Stick electrodes, capacitor plates and / or rotating cylinders.
  • the fibrous web should rotate in the region of the electrodes Cylinder guided and preferably supported by a sieve.
  • the preferably predominantly metallic Cylinder forms an electrode and on the with respect to the fibrous web opposite side at least one stick electrode and / or one Capacitor plate of different polarity is arranged. It is included as a protective measure an advantage if the cylinder has an electrically insulating outer coating. On the other hand, it is also possible that in the wrapping area of the cylinder there are at least two stick electrodes of different polarity, the High-frequency waves partially penetrate the fibrous web.
  • FIG. 1 there is a microwave transmitter 2 along the looping area arranged outside the cylinder 3.
  • the microwave transmitter 2 consists of a series of several across Path running waveguides with a rectangular cross-section, each with are connected to a microwave source. However, it is also possible that Arrange waveguide meandering. The resulting microwaves provide for the fact that the wetter parts of the fibrous web 1 are heated up more and thus are dried than the other areas. The result is a more even one Moisture cross profile.
  • a shield 6 is arranged around the microwave transmitter 2, so that none Microwaves leave this device.
  • the cylinder 3 is approximately 2 cm thick Coating 4 made of Teflon, which absorbs the microwaves less strongly than that Fibrous web 1. The thickness of the coating 4 ensures that the metallic Area of the cylinder 3 is as far away from the fibrous web 1, so that a the greatest possible field strength of the microwaves in the fibrous web 1 is guaranteed.
  • Figures 2 and 3 show high frequency devices in which the run of the Fibrous web 1 is stabilized via a running, external sieve 5.
  • the devices with a shield 6 for Provide high frequency waves.
  • the fibrous web 1 is connected to a high-frequency source (HF) Electrodes of different polarity passed. This also leads to warming and drying the moist areas of the fibrous web 1 with the result a relatively uniform moisture cross profile.
  • HF high-frequency source
  • the metallic, rotating cylinder 3 itself forms one with the high-frequency source connected electrode 7.
  • the electrode 7 of the other polarity is of a Capacitor plate formed, which is arranged in the wrapping area of the cylinder 3 is.
  • the high-frequency waves penetrate the fibrous web 1, which the Arrangement makes it very effective. Because of the function of the cylinder 3 as an electrode 7 it should have an electrically insulating coating in the moist area Own fibrous web 1.
  • all electrodes 7 are formed by stick electrodes in FIG. 3, which are arranged in the wrapping area of the cylinder 3.
  • the one High-frequency source (HF) connected electrodes are polarized so that Adjacent stick electrodes always have different polarities. That I field forming between the electrodes 7 penetrates the fibrous web 1 at least partially, which also leads to the heating and drying of the damp areas the fibrous web 1 leads.
  • HF High-frequency source
  • the stick electrodes as well as the capacitor plate extend essentially across the fibrous web 1 and parallel to the cylinder 3.
  • the devices can be in several places on a paper or coating machine be arranged. Furthermore, the entire drying process can will be realized. However, such devices are preferably for Moisture cross profile correction in dryer sections with conventionally heated Drying cylinders, which are wrapped in the fibrous web.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Biotechnology (AREA)
  • Textile Engineering (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
EP99112923A 1998-09-11 1999-07-05 Régulation du profil d'humidité Withdrawn EP0989231A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19841638A DE19841638A1 (de) 1998-09-11 1998-09-11 Feuchteprofilierung
DE19841638 1998-09-11

Publications (2)

Publication Number Publication Date
EP0989231A2 true EP0989231A2 (fr) 2000-03-29
EP0989231A3 EP0989231A3 (fr) 2001-04-25

Family

ID=7880651

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99112923A Withdrawn EP0989231A3 (fr) 1998-09-11 1999-07-05 Régulation du profil d'humidité

Country Status (3)

Country Link
US (2) US6425190B1 (fr)
EP (1) EP0989231A3 (fr)
DE (1) DE19841638A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736935B2 (en) 2002-06-27 2004-05-18 Kimberly-Clark Worldwide, Inc. Drying process having a profile leveling intermediate and final drying stages
WO2004083523A1 (fr) * 2003-03-21 2004-09-30 Saueressig Gmbh + Co. Procede de production d'un produit fibreux absorbant et produit fibreux absorbant
CN109631546A (zh) * 2018-11-12 2019-04-16 芜湖顺成电子有限公司 一种螺旋式电线烘干装置

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305598A1 (de) * 2003-02-11 2004-08-19 Voith Paper Patent Gmbh Messverfahren und Messeinrichtung zur Bestimmung des Feuchtigkeitsgehaltes einer Materialbahn
DE10319724A1 (de) * 2003-05-02 2005-01-20 Voith Paper Patent Gmbh Verfahren und Siebpartie einer Maschine zur Herstellung einer Faserstoffbahn
DE10347587A1 (de) * 2003-10-14 2005-05-19 Voith Paper Patent Gmbh Vorrichtung zur Entwässerung einer Faserstoffbahn
FI20051096L (fi) * 2005-10-31 2007-05-01 Savcor Process Oy Menetelmä paperikoneen, kartonkikoneen tai muun vastaavan rainanmuodostuskoneen märässä päässä
DE102008038215A1 (de) * 2008-08-18 2010-02-25 Siemens Aktiengesellschaft Verfahren und Vorrichtung zur Trocknung einer Papierbahn
DE102008062320B3 (de) * 2008-12-15 2010-04-15 Siemens Aktiengesellschaft Trockenkammer zur dielektrischen Trocknung eines Guts, insbesondere einer Papierbahn
ATE529568T1 (de) * 2008-12-23 2011-11-15 Tecnerga S R L System zum einstellen und kontrollieren des wassergehalts von papier während des produktionszyklus
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
CN108518951B (zh) * 2018-03-27 2019-11-05 宁波雯泽纺织品有限公司 纺织品加工用烘干设备
CN114608294B (zh) * 2020-12-07 2023-09-08 辛集市祥光绒布有限公司 大型立式布料干燥装置

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DE697509C (de) * 1936-06-11 1940-10-16 Siemens Schuckertwerke Akt Ges Trockenvorrichtung fuer Papierbahnen auf Papiermaschinen
DE691038C (de) * 1937-07-01 1940-05-15 Siemens Schuckertwerke Akt Ges Einrichtung zum Trocknen von Papierbahnen und aehnlichen Stoffbahnen
DE694637C (de) * 1937-09-03 1940-08-05 Siemens Schuckertwerke Akt Ges Einrichtung zur Erwaermung, insbesondere Trocknung, von Holz, Papier oder aehnlichen Gegenstaenden in einem elektrischen Felde
US2319174A (en) * 1942-06-23 1943-05-11 Fred K H Levey Co Inc Method of and apparatus for printing
GB1027589A (en) * 1964-06-04 1966-04-27 Fitchburg Paper Drying travelling webs
AU445577B2 (en) * 1968-06-14 1974-02-08 Ford Russell George Process and apparatus for moisture contents de-peaking and equalization
DE1959116A1 (de) * 1969-11-25 1971-05-27 Boehmer Eisenwerk Kg Aufrueckvorrichtung fuer Schienenwagen
US3952421A (en) * 1974-10-18 1976-04-27 Chemetron Corporation Dielectric heating arrangement for drying a continuously moving web of material
US4188731A (en) * 1976-08-25 1980-02-19 Rauskolb Fred W Method and apparatus for eliminating wet streaks in fibrous sheets or webs by infra-red radiation
DE2816551C3 (de) 1978-04-17 1981-11-26 SIEMENS AG AAAAA, 1000 Berlin und 8000 München Trocknungsregelung an einer Papiermaschine
DE3445615A1 (de) * 1984-12-14 1986-06-19 Maschinenfabrik Horst Kabus GmbH, 7085 Bopfingen Verfahren zum trocknen von bahnen aus papier, textil oder dergleichen
FI74062C (fi) * 1985-12-12 1987-12-10 Imatran Voima Oy Foerfarande och anordning foer minskning hoegfrekvent elenergi av fuktighetsdifferenserna hos en roerlig bana medelst.
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US5064979A (en) * 1990-08-07 1991-11-12 W. R. Grace & Co.-Conn. Microwave air float bar for drying a traveling web
EP0561934B1 (fr) * 1990-12-17 1995-10-11 GUSTAFSSON, Per Erik Appareil produisant de l'energie et son procede d'utilisation
SE9100064L (sv) * 1991-01-07 1992-07-08 Sven Gunnar Nygren Torkningsanordning
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6736935B2 (en) 2002-06-27 2004-05-18 Kimberly-Clark Worldwide, Inc. Drying process having a profile leveling intermediate and final drying stages
WO2004083523A1 (fr) * 2003-03-21 2004-09-30 Saueressig Gmbh + Co. Procede de production d'un produit fibreux absorbant et produit fibreux absorbant
US7758722B2 (en) 2003-03-21 2010-07-20 Saueressig Gmbh + Co. Production method for an absorbent fiber product and corresponding absorbent fiber product
CN109631546A (zh) * 2018-11-12 2019-04-16 芜湖顺成电子有限公司 一种螺旋式电线烘干装置

Also Published As

Publication number Publication date
DE19841638A1 (de) 2000-03-16
US6463677B2 (en) 2002-10-15
EP0989231A3 (fr) 2001-04-25
US20020043004A1 (en) 2002-04-18
US6425190B1 (en) 2002-07-30

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