EP4519492A1 - Zylinder zur trocknung einer faserstoffbahn - Google Patents
Zylinder zur trocknung einer faserstoffbahnInfo
- Publication number
- EP4519492A1 EP4519492A1 EP23705211.3A EP23705211A EP4519492A1 EP 4519492 A1 EP4519492 A1 EP 4519492A1 EP 23705211 A EP23705211 A EP 23705211A EP 4519492 A1 EP4519492 A1 EP 4519492A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- electrical heating
- heating device
- jacket
- electrical
- 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
- D21F5/022—Heating the cylinders
- D21F5/024—Heating the cylinders using electrical means
-
- 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
- F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
- F26B13/18—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning heated or cooled, e.g. from inside, the material being dried on the outside surface by conduction
- F26B13/183—Arrangements for heating, cooling, condensate removal
-
- 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
- D21F5/021—Construction of the cylinders
-
- 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
- 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
- D21F5/06—Regulating temperature
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/02—Rolls; Their bearings
- D21G1/0206—Controlled deflection rolls
- D21G1/0213—Controlled deflection rolls with deflection compensation means acting between the roller shell and its supporting member
- D21G1/022—Controlled deflection rolls with deflection compensation means acting between the roller shell and its supporting member the means using fluid pressure
Definitions
- the invention relates to a cylinder for drying a fibrous web, comprising a cylinder jacket with an outside for guiding the fibrous web to be dried and an inside, an electrical heating device for heating the cylinder being arranged within the cylinder.
- a fibrous web is typically dried using steam-heated cylinders.
- Steam-heated cylinders are characterized by high thermal output. There is a uniform temperature distribution on the cylinder surface, although the edge area of the cylinder jacket often has an excessive temperature.
- Steam-heated cylinders must be designed as pressure vessels, which entails greater cylinder wall thicknesses, which is disadvantageous for heat transfer. The actual steam production takes place as part of combustion processes and is therefore criticized for ecological reasons.
- Steam cylinders can be grouped together, with each group being characterized by a specific vapor pressure or temperature. This makes it possible to profile the drying in the machine direction by appropriately adjusting the heating output of the individual groups. However, profiling the drying in the cross-machine direction is not possible using the steam-heated cylinders.
- Infrared dryers are also known, which are characterized by radiant heat transfer and do not use heat transfer based on direct heat conduction. Such infrared dryers include gas-operated dryers as well as electrically operated radiators.
- the aim of the invention is to provide a cylinder for drying a fibrous web with an electrical heating device with improved efficiency.
- a further aim of the invention is an improved profile control of the heat transfer through the cylinder.
- the electrical heating device is arranged on the inside of the cylinder jacket to form a conductive-heat-conducting connection, the electrical heating device comprising at least one electrical heating element with carbon nanotubes.
- the heat flows necessary for drying can be realized precisely when the heating device comes into direct contact with the inside of the cylinder jacket - ie when a conductive-heat-conducting connection is formed. It was also recognized that the use of an electrical heating element comprising carbon nanotubes allows the realization of larger heat flows, with excellent thermal conductivity and in particular improved efficiency in the use of heat from electricity. This means that the required temperatures of 90°C-130°C can be displayed on the outside of the cylinder jacket.
- the cylinder is made of steel or cast iron, since steel or cast iron has advantageous properties in terms of thermal conductivity or mechanical strength. This makes it possible to create thin-walled cylinders that can withstand mechanical stress and have good heat transfer. Diameters of the cylinder in the range between 1500 mm and 1800 mm with wall thicknesses of less than 30 mm or less than 25 mm are also typical.
- An advantageous embodiment of the cylinder is characterized in that the electrical heating device, in particular the at least one electrical heating element, is cohesively connected to the inside of the cylinder jacket and is in particular glued, or is non-positively connected, in particular is pressed against the inside of the cylinder jacket. In both cases, an advantageous heat transfer is ensured, with the heat transfer occurring reliably, precisely and evenly.
- the at least one electrical heating element is designed as a heating mat.
- the heating mat By designing it as a heating mat, the entire inside of the cylinder jacket can be covered quickly and easily.
- the heating mat essentially consists of silicone with embedded carbon nanotubes. Such heating mats allow a homogeneous temperature distribution, and a particularly homogeneous temperature distribution can be achieved by abutting several heating mats.
- a further advantageous embodiment of the cylinder is characterized in that the electrical heating device comprises insulation, with the at least one electrical heating element being arranged between the insulation and the inside of the cylinder jacket.
- the advantageous arrangement of the insulation allows heat loss to be avoided, with the heat being transported primarily from the heating element towards the inside of the cylinder jacket.
- the insulation of the heater can be designed as a replacement or as a supplement to the known cylinder cover insulation.
- the heating device comprises at least a first and a second zone
- the zones each comprise at least one electrical heating element with carbon nanotubes, the zones being arranged in the axial direction of the cylinder on the inside of the cylinder jacket, and a first heating power of the first zone can be adjusted independently of a second heating power of the second zone.
- the invention allows profile control of the heat transfer through the cylinder in the axial direction.
- the electrical heating elements are arranged in the axial direction, the axial profile can be adjusted by specifically adjusting the first or second heating power. According to the invention, the course of the surface temperature of the cylinder can therefore be easily controlled.
- An advantageous embodiment of the cylinder is characterized in that covers connected to the end face of the cylinder jacket are included, with a connection for supplying the electrical heating device with electrical current being guided through at least one cover.
- the connection for supplying the electrical heating device with electrical current is advantageously routed through at least one cover.
- the cover can also have a pin, with the supply connection being guided through the pin.
- the connection further comprises one with the Cylinder moving slip ring body, the slip ring body being designed to absorb electrical current.
- standing contact pins can be arranged in the area of the non-rotatable environment, which are in contact with the slip ring body in order to establish an electrical connection of the heating device to an electrical power source.
- the invention further relates to a cylinder group comprising at least a first and a second cylinder according to the invention, wherein the electrical heating device of the first cylinder can be controlled independently of the electrical heating device of the second cylinder.
- the first and second cylinders are independent of one another.
- Figure 1 shows a cylinder 1 according to the invention for drying a fibrous web with a cylinder jacket 2.
- a fibrous web to be dried can be guided on the outside of the cylinder jacket 2.
- An electrical heating device 3 for heating the cylinder 1 is arranged within the cylinder 1, the electrical heating device 3 being arranged on the inside of the cylinder jacket 2 to form a conductive-heat-conducting connection and the electrical heating device 3 having at least one electrical heating element 4 with carbon nanotubes includes.
- the at least one electrical heating element 4 is designed as a heating mat, with the heating mats in particular being able to be installed very easily on the inside of the jacket 2.
- the electric heating device 3 comprises at least a first and a second zone 5, 6, the zones 5, 6 being arranged offset in the axial direction of the cylinder on the inside of the cylinder jacket, with a first heating output of the first zone 5 being independent of a second heating output of the second zone 6 can be adjusted.
- the cylinder 1 can be designed with a cover 7, the covers 7 being connected to the cylinder jacket 2 on the front side.
- the electric heating device 3 is advantageously supplied with electrical current through a connection which is guided at least through a cover.
- connection further comprises a slip ring body that moves with the cylinder 1 and is designed to receive electrical current.
- the present invention offers numerous advantages, in particular the cylinder has an electrical heating device with improved efficiency, whereby the heat flows necessary for drying a fibrous web can be realized. According to the invention, a homogeneous temperature distribution on the outside of the cylinder jacket can be set, but axial profiling of the heat transfer through the cylinder is also possible. In particular, the electrical heating elements designed as heating mats can be easily installed.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Drying Of Solid Materials (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA50302/2022A AT525162B1 (de) | 2022-05-03 | 2022-05-03 | Zylinder zur trocknung einer faserstoffbahn |
| PCT/EP2023/053121 WO2023213454A1 (de) | 2022-05-03 | 2023-02-08 | Zylinder zur trocknung einer faserstoffbahn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4519492A1 true EP4519492A1 (de) | 2025-03-12 |
| EP4519492B1 EP4519492B1 (de) | 2026-04-01 |
Family
ID=84839211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23705211.3A Active EP4519492B1 (de) | 2022-05-03 | 2023-02-08 | Zylinder zur trocknung einer faserstoffbahn |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20250290695A1 (de) |
| EP (1) | EP4519492B1 (de) |
| CN (1) | CN119072562A (de) |
| AT (1) | AT525162B1 (de) |
| CA (1) | CA3251413A1 (de) |
| WO (1) | WO2023213454A1 (de) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3624353A (en) * | 1970-04-28 | 1971-11-30 | Tampella Oy Ab | Drying cylinder |
| FI74067C (fi) * | 1985-04-19 | 1987-12-10 | Valmet Oy | Vals i pappersmaskin, vilken vals har en profilreglerbar mantel. |
| DE19929520A1 (de) * | 1999-06-28 | 2001-01-04 | Voith Paper Patent Gmbh | Beheizter Zylinder |
| DE102008063849A1 (de) * | 2008-12-19 | 2010-06-24 | Tesa Se | Beheiztes Flächenelement und Verfahren zu seiner Befestigung |
| DE102011110973A1 (de) * | 2010-08-25 | 2012-03-01 | Rainer Hartmann | Zuschneidbare Heizmatte |
| US8995894B2 (en) * | 2011-09-08 | 2015-03-31 | Samsung Electronics Co., Ltd. | Image fusing apparatus using carbon nano-tube heater |
| WO2013132069A1 (de) * | 2012-03-08 | 2013-09-12 | Bielomatik Leuze Gmbh + Co. Kg | Heizelement |
-
2022
- 2022-05-03 AT ATA50302/2022A patent/AT525162B1/de active
-
2023
- 2023-02-08 CA CA3251413A patent/CA3251413A1/en active Pending
- 2023-02-08 EP EP23705211.3A patent/EP4519492B1/de active Active
- 2023-02-08 WO PCT/EP2023/053121 patent/WO2023213454A1/de not_active Ceased
- 2023-02-08 CN CN202380034599.8A patent/CN119072562A/zh active Pending
- 2023-02-08 US US18/860,043 patent/US20250290695A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20250290695A1 (en) | 2025-09-18 |
| CN119072562A (zh) | 2024-12-03 |
| AT525162B1 (de) | 2023-01-15 |
| EP4519492B1 (de) | 2026-04-01 |
| AT525162A4 (de) | 2023-01-15 |
| WO2023213454A1 (de) | 2023-11-09 |
| CA3251413A1 (en) | 2025-03-03 |
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