WO2005049918A1 - A method for treating a fibrous web in the dryer section of a paper/board machine and in a finishing device located thereafter - Google Patents
A method for treating a fibrous web in the dryer section of a paper/board machine and in a finishing device located thereafter Download PDFInfo
- Publication number
- WO2005049918A1 WO2005049918A1 PCT/FI2004/050163 FI2004050163W WO2005049918A1 WO 2005049918 A1 WO2005049918 A1 WO 2005049918A1 FI 2004050163 W FI2004050163 W FI 2004050163W WO 2005049918 A1 WO2005049918 A1 WO 2005049918A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- web
- dryer section
- finishing device
- calender
- fibrous web
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/006—Calenders; Smoothing apparatus with extended nips
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
Definitions
- the present invention relates to a method for treating a fibrous web in an on-line dryer section of a paper or board production line, in a web transfer section following it, and further in an on-line finishing device following the dryer section, such as a calender or coating device.
- the calender may be, for example, a metal belt calender, a long-nip calender, a multi-nip calender, a soft calender or a machine calender.
- the dryer section and finishing treatment are separate sub-processes between which the paper web is often transferred as an open draw, in which the surface of the web is exposed to the environment.
- an open draw in which the surface of the web is exposed to the environment.
- a significant amount of moisture evaporates from the web and the web cools.
- evaporation taking place between the dryer and the calender is undesirable, because the fibrous web should be moist and hot when calendered.
- the web cools dramatically and thus, for example, on-line calenders have to be dimensioned so that their capacity will suffice for treating the partly cooled web. Evaporation is also a load on the factory hall air conditioning as well as being uneconomical.
- water application is often used on paper/board production lines and it is usually located between the dryer section and calendering.
- the method of application is often a fine water mist or steam. Better control of the moisture profiles of the paper web as well as a more stable paper structure are aimed for through overdrying and re- moistening.
- the aim of the present invention is, therefore, to provide a method by means of which, inter alia, energy consumption on the production line can be reduced, and which method also makes it possible to shorten the dryer group and to lower costs due to the savings in space resulting therefrom.
- the method according to the invention is characterised in that in the method, the fibrous web being treated is arranged to travel between the dryer section and the finishing device in conditions controlled with respect to temperature and moisture, by means of which conditions the evaporation of water and heat from the fibrous web is adjusted, and that the fibrous web is dried in the dryer section in such a way that it maintains a greater moisture content than normal after the dryer section and the final drying is carried out by means of a finishing device.
- the water and thermal energy in the fibrous web are utilised with the aim of preventing or minimising the transfer of heat and moisture from the web in the section between the dryer section and the calender.
- the fibrous web being treated is arranged to travel between the dryer section and the calender, separate from the factory hall air and in controlled conditions with respect to temperature and moisture, by means of which the evaporation of water and heat from the fibrous web is controlled.
- the fibrous web is dried in the dryer section so as to maintain a higher moisture content than normal, and final drying is carried out by means of the calender.
- drying and calendering are integrated with respect to temperature and moisture control and arranged to cooperate in such a way that the dryer section only dries the required amount, and that when transferring the web from the dryer section to the calender, the evaporation of water and heat are adjusted so that the web will be sufficiently moist and warm on arrival at the calender, and that a part of the final drying takes place on the calender.
- Figure 1 shows diagrammatically an arrangement for implementing the method according to the invention
- Figure 2 shows diagrammatically another way of implementing the method according to the invention.
- Figure 1 shows diagrammatically a part of an on-line production line, where reference numeral 1 denotes a finishing device implemented as a metal belt calender, and reference numeral 3 denotes the end part of the dryer section.
- Reference numeral 2 denotes an enclosed space, through which the web may be led in conditions controlled with respect to temperature and moisture in the area between the dryer section and the calender 1.
- the enclosed space may extend over the entire area between the end part of the dryer section and the calender, or only over a part of the said area.
- the finishing device may also be realised, for example, as a long-nip calender, a multi-nip calender, a soft calender or a machine calender.
- the finishing device may also be a coating device, such as a dry coating device.
- the water and thermal energy contained in the fibrous web are utilised by limiting the evaporation of the water and heat in the paper after the dryer section 3 in such as way that the need to heat and moisten the fibrous web according to the requirements of the calender 1 is reduced. Since the paper web will in any case dry and cool in connection with or after calendering, it is advantageous to utilise this drying process. Accordingly, in the method relating to the invention, the operation of the dryer section 3, web transfer 2 and calender 1 is co-ordinated in such a way that a part of the drying function of the dryer section is assigned to the calender, and in which method as a whole, the use of heat and water is as economical as possible.
- the above-mentioned heat and moisture control of the web according to the invention can be achieved by regulating the transfer of water and thermal energy between the fibrous web and its surroundings between the last drying cylinder 3 and the calender 1.
- these transfer phenomena can be regulated by arranging the web to travel between the dryer section and the calender under conditions controlled with respect to temperature and moisture. If it is desirable to prevent evaporation or cooling, ambient moisture (relative moisture of air or steam pressure) and temperature on the outer surface of the web or in its immediate vicinity is adjusted to an equilibrium corresponding approximately to the moisture and temperature of the fibrous web. This means that no significant temperature or moisture differences arise between the web and its surroundings, and thus no transfer flows of moisture or temperature are formed.
- heat flow in the direction of the web may be caused by raising the ambient temperature to a level higher than the temperature of the web.
- moisture flow in the direction of the web may be caused by increasing ambient moisture to a level higher than the equilibrium moisture content of the web. It is obviously possible to cause corresponding, but reversed, transfer phenomena by reversing the corresponding moisture and temperature differences between the web and the surroundings.
- the solutions according to the invention described above for controlling the temperature and moisture of the web may be realised, for example, by arranging the fibrous web to travel through a stationary tunnel or hood structure.
- the walls of the tunnel or hood structure confine inside them a space having moisture and temperature conditions adjusted so as to be advantageous to the process.
- the wall structure prevents temperature and moisture losses and the said space is sufficiently sealed and separated from the air in the factory hall.
- Another possibility for implementing the invention is to arrange the travelling of the web between moving support structures, where the support structures regulate the transfer of water and heat to the immediate surroundings in the desired manner.
- the most practical solution is to support the travelling of the web by means of wire or belt loops rotating on either one or both sides.
- the wires or belts may be either impermeable or to some extent permeable (moisture transfer control) and, if necessary, heated/cooled (temperature control), should this be appropriate for the whole.
- a third possible solution in principle for controlling the temperature and moisture of the fibrous web is to control the flow and heat transfer boundary layer.
- the temperature and moisture of the web will change through transfer phenomena acting between the web and its immediate surroundings.
- humid air or air saturated with water vapour may be blasted to the boundary layer of the moving fibrous web.
- the penetration of air into the boundary layer can be ensured by doctoring off the previous boundary layer.
- Figure 2 shows diagrammatically a solution of this type, where the earlier boundary layer 6 is removed with a doctor blade 4 and air forming the new boundary layer 7 is blasted on the surface of the web W by blasting means 5.
- the transfer of moisture and heat between the web and its surroundings may be regulated in both the machine direction and especially in the transverse direction, if so desired. Furthermore, in addition to the draw between the dryer section and the finishing device, transfer of moisture and heat may also be regulated at points between different parts of the finishing device, such as at a point between the different nips of a soft calender, between the different roll stacks in a multi-nip calender, or at corresponding points.
- the paper is not dried in the dryer section to a level (about 5%) lower than the moisture content of the final use of the paper, whereby the final drying to this moisture level will take place in the calender.
- the method according to the invention is applicable to paper and board production lines, in which further processing requiring heat or moisture, such as calendering, is located on the line in on-line manner.
- the method is particularly well-suited for metal belt calenders and long-nip calenders, where the calendering effect is based significantly more on the softening effect of temperature on the fibrous web than in conventional calenders.
- the invention is also applicable to a process in which the web is treated with another device instead of the calender, where controlling the temperature and moisture of the web is essential.
- Such devices may be a coating device, especially a dry coating device and the fixing press for the dry coating agent comprised in it, that is, the sizer press.
- the fact that the water/softener is distributed better in the structure of the paper and controlling the moisture level is easier to arrange when evaporation is controlled over the transfer as a whole.
- the thickness-wise distribution of moisture may be affected, for example, by controlling the operation of the drying cylinders or by regulating evaporation taking place during the web transfer itself.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004800275371A CN1856619B (en) | 2003-11-20 | 2004-11-12 | A method for treating a fibrous web in the dryer section of a paper/board machine and in a finishing device located thereafter |
JP2006540493A JP2007511677A (en) | 2003-11-20 | 2004-11-12 | Fiber web processing method in dryer section of paper machine or paperboard machine with finishing equipment |
DE112004002075.1T DE112004002075B4 (en) | 2003-11-20 | 2004-11-12 | A method of treating a fibrous web in the dry area of a paper / board machine and in a finishing device thereafter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20035214A FI114994B (en) | 2003-11-20 | 2003-11-20 | Treating fibrous web in paper machine involves arranging web to travel between dryer section and finishing device under controlled temperature and moisture conditions to regulate evaporation of water and heat from web, and drying web |
FI20035214 | 2003-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005049918A1 true WO2005049918A1 (en) | 2005-06-02 |
Family
ID=29558734
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2004/050163 WO2005049918A1 (en) | 2003-11-20 | 2004-11-12 | A method for treating a fibrous web in the dryer section of a paper/board machine and in a finishing device located thereafter |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2007511677A (en) |
CN (1) | CN1856619B (en) |
DE (1) | DE112004002075B4 (en) |
FI (1) | FI114994B (en) |
WO (1) | WO2005049918A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7704351B2 (en) * | 2002-01-29 | 2010-04-27 | Metso Paper, Inc. | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI20065671L (en) * | 2006-10-20 | 2008-04-21 | Metso Paper Inc | Pressing arrangement in a processing device equipped with a belt rotation of a paper/cardboard machine or post-processing machine |
FI121186B (en) * | 2008-12-08 | 2010-08-13 | Metso Paper Inc | Metal belt maintenance device |
EP2635741A1 (en) * | 2010-11-01 | 2013-09-11 | Metso Paper, Inc. | Process for producing multilayer fiber web |
CN112127200A (en) * | 2020-09-30 | 2020-12-25 | 湖北中烟工业有限责任公司 | Humidification system of saturated steam humidification interior slip sheet |
CN117183539A (en) * | 2023-09-26 | 2023-12-08 | 湖北汇启丰板材有限责任公司 | Novel plate facing processing technology |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1026318A2 (en) * | 1999-02-06 | 2000-08-09 | Voith Sulzer Papiertechnik Patent GmbH | Calender |
US6207019B1 (en) * | 1995-08-18 | 2001-03-27 | Abitibi-Price, Inc. | Calender hood |
WO2001075224A1 (en) * | 2000-04-04 | 2001-10-11 | Metso Paper, Inc. | Method and arrangement for controlling moisture in a multiroll calender |
WO2003064761A1 (en) * | 2002-01-29 | 2003-08-07 | Metso Paper, Inc. | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4412625C2 (en) | 1994-04-13 | 1999-05-06 | Kleinewefers Gmbh | Device and method for treating a material web |
FI115235B (en) * | 2000-02-11 | 2005-03-31 | Metso Paper Inc | Method and device for calendering |
ATE421613T1 (en) * | 2002-01-29 | 2009-02-15 | Metso Paper Inc | PROCESSING DEVICE FOR PROCESSING AN OPTIONALLY COATED FIBROUS WEB |
JP3686389B2 (en) * | 2002-04-15 | 2005-08-24 | 三菱重工業株式会社 | Paper machine |
-
2003
- 2003-11-20 FI FI20035214A patent/FI114994B/en not_active IP Right Cessation
-
2004
- 2004-11-12 JP JP2006540493A patent/JP2007511677A/en active Pending
- 2004-11-12 CN CN2004800275371A patent/CN1856619B/en not_active Expired - Fee Related
- 2004-11-12 DE DE112004002075.1T patent/DE112004002075B4/en not_active Expired - Fee Related
- 2004-11-12 WO PCT/FI2004/050163 patent/WO2005049918A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6207019B1 (en) * | 1995-08-18 | 2001-03-27 | Abitibi-Price, Inc. | Calender hood |
EP1026318A2 (en) * | 1999-02-06 | 2000-08-09 | Voith Sulzer Papiertechnik Patent GmbH | Calender |
WO2001075224A1 (en) * | 2000-04-04 | 2001-10-11 | Metso Paper, Inc. | Method and arrangement for controlling moisture in a multiroll calender |
WO2003064761A1 (en) * | 2002-01-29 | 2003-08-07 | Metso Paper, Inc. | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7704351B2 (en) * | 2002-01-29 | 2010-04-27 | Metso Paper, Inc. | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
Also Published As
Publication number | Publication date |
---|---|
FI114994B (en) | 2005-02-15 |
DE112004002075B4 (en) | 2019-02-21 |
DE112004002075T5 (en) | 2008-11-27 |
CN1856619B (en) | 2010-12-08 |
CN1856619A (en) | 2006-11-01 |
FI20035214A0 (en) | 2003-11-20 |
JP2007511677A (en) | 2007-05-10 |
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