EP0984096A1 - Verfahren und Trockenpartie zum Trocknen einer Faserstoffbahn - Google Patents

Verfahren und Trockenpartie zum Trocknen einer Faserstoffbahn Download PDF

Info

Publication number: EP0984096A1
Authority: EP; European Patent Office
Prior art keywords: drying; web; input nip; fibrous web; drying section
Prior art date: 1998-09-04
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

Application number

EP99660137A

Other languages

English (en)

French (fr)

Other versions

EP0984096B1 (de

Inventor

Carl-Gustav Berg

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.)

Equitor Oy

Original Assignee

Equitor Oy

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.)

1998-09-04

Filing date

1999-09-03

Publication date

2000-03-08

1999-09-03 Application filed by Equitor Oy filed Critical Equitor Oy

2000-03-08 Publication of EP0984096A1 publication Critical patent/EP0984096A1/de

2004-11-24 Application granted granted Critical

2004-11-24 Publication of EP0984096B1 publication Critical patent/EP0984096B1/de

2019-09-03 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

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
- D21F5/001—Drying webs by radiant heating
- 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
- 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
- D21F5/048—Drying on cylinders on two or more drying cylinders in combination with other heating means

Definitions

the invention relates to a method for drying a fibrous web in a drying section which is preferably intended for drying paper web, pulp web and board web in paper machines, the drying section comprising a plurality of drying cylinders in which an input nip is formed at a moving fibrous web.
the method of the invention is characterized by the following steps to be performed as a combination to obtain a more rapid drying, the steps comprising
the drying section is according to the invention characterized by a combination to obtain a more rapid drying, comprising
dwell air or "air” here refers to a combination of dry air and water vapour.
the heating means employed in the invention are based on heating by means of electromagnetic waves, preferably IR rays (infrared rays) or microwaves.
the heating means are preferably directed against the fibrous web, in which case the surface of the fibrous web is very efficiently heated.
the preferred embodiments of the drying section are disclosed in the attached claims 2-11.
the invention is thus based on the idea to provide an efficient drying of a fibrous web by increasing the moisture content in the input nip at the same as the surface temperature of the fibrous web at the input nip is increased.
the temperature of damp vapour in such a quality control application is 100 - 200 °C, the vapour is not able to increase the surface temperature of the paper web, since the paper web is transferred at high speeds, for example 20 m/s.
the moisture supply and the heating are not carried out in the present invention to locally increase the evaporation intensity but to obtain an increased contact heat transfer coefficient between the fibrous web and the drying cylinder.
the surface temperature of the fibrous web can be substantially increased, when the heating means based on heating by means of electromagnetic waves combined with moisture supply is used in the input nip.
the heating means based on heating by means of electromagnetic waves combined with moisture supply is used in the input nip.
a press roll pressing the fibrous web against the drying cylinder can preferably be applied at the input nip.
the press roll reduces the size of the air layer between the fibrous web and the drying cylinder but cannot entirely remove the air layer. However, the press roll cannot as such substantially speed up the drying process, without heating the fibrous web and providing the input nip with moisture.
the present invention allows to economize on energy costs and provides a drying section having a better efficiency than those known in the art.
the fibrous web can be dried more rapidly and with fewer drying cylinders.
the total costs for evaporating water from the fibrous web is calculated to drop approximately by 10%.
the transportation speed of the fibrous web can be increased by 20-30%.
Figure 1 shows a part of a drying section of the invention.
a paper web 1 supported by a wire 2 is fed over a drying cylinder 3 and thereafter continues over remaining cylinders 4 and 5.
the drying section may include another fibrous web, such as a pulp web or a board web, instead of a paper web.
An input nip, which is formed between the paper web 1 and the drying cylinder 3, is generally indicated by reference number 6 and an enlargement of the nip is shown in Figure 2.
a press roll 9 is arranged to press the paper web 1 against the drying cylinder 3.
the drying cylinder 3 refers to a first drying cylinder of the drying section.
the surface temperature thereof is approximately 60-70 °C.
the speed of the paper web 1 is for instance 25 m/s and the temperature of the paper web 1 is 50-60 °C closely before the nip 6.
a heating means 7 is arranged close to the nip 6.
the heating means is based on heating by means of infrared rays (IR) and is directed towards the surface of the paper web 1, indicated by a number of arrows perpendicular to the paper web.
the heating means 7 that obtains its energy by means of gas energy is arranged to heat the surface temperature of the paper web 1 at the input nip 6 by 1-40 °C.
the surface temperature is increased by 0,5 - 25 °C.
the increase in temperature remains lower than for light fibrous webs. Examples of such light fibrous webs are paper or fine paper webs.
the surface temperature t c of the paper web at a point C in the gap between the paper web and the drying cylinder 3 is approximately 60 °C.
the surface temperature of the paper web has risen to, for example 75 °C, and the temperature in the gap between the paper web and the drying cylinder (not shown) is 75-85 °C (75 °C at the input nip and 85 °C at the output nip); the temperature of the drying cylinder is for example 95 °C.
the temperature thereof is approximately 90 - 100 °C.
the surface temperature of the last drying cylinder is thus 100 - 130 °C.
Reference number 8 indicates a moisture supply means for blowing vapour or damp air into the input nip 6.
the moisture supply means comprises a number of ejectors or nozzles 8 pointed at the input nip 6 so as to blow into the tip of the nip in such a manner that the vapour or damp air leaves the nip not only along the surface of the paper web 1 but also along the surface of the drying cylinder 3 in the opposite direction of the movement of the paper web and the drying cylinder.
the very thin air gap between the paper web 1 and the drying cylinder 3 in the area close to the press roll 9 obtains high humidity.
the ejectors ensure an increase in the moisture ratio at the input nip 6.
An increase of the moisture ratio generally describes a rise in the temperature of the wet thermometer, from hereinafter referred to as wet temperature.
a desirable change interval in the wet temperature will partly correspond with the paper web's surface temperature increase (1-40 °C) in the examined nip and will therefore be in the range 1 to 50 °C.
the wet temperature can thus range from 51 to 101 °C.
the surface temperature of the paper web is increased for instance from 75 to 76 °C this results in a change in the humidity from 0,38 to 0,41 kg H2O/kg dry air, or a more desirable increase in this case is a rise by 10 °C, that corresponds with a humidity change from 0,38 to 0,83 KG H2O/kg dry air.
vapour or damp air is fed into the drying cylinder and the paper web, then the wet temperature should preferably exceed the surface temperature of the drying cylinder.
the dry temperature for vapour or damp air that is blown using ejectors can range between 100-300 °C but even temperatures beyond this range are possible.
Figure 1 also shows a number of air nozzles 11 arranged at the output nip 10 of the drying cylinder 3 for blowing damp air towards the paper web.
the heating means used can thus also be based on electromagnetic waves with a different wavelength than the one for IR radiation.
the heating means need not necessarily obtain its energy from gas but can also be electrically driven if electricity is advantageously available.
the number of drying cylinders may vary, and the press roll is not essential for the invention, although better results can be achieved with the press roll.
the temperature in the drying cylinders may also vary.
the heating means and the press rolls may be arranged close to all drying cylinders or only to a part of the drying cylinders of the drying section.

Landscapes

Paper (AREA)
Drying Of Solid Materials (AREA)
Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

EP99660137A 1998-09-04 1999-09-03 Verfahren und Trockenpartie zum Trocknen einer Faserstoffbahn Expired - Lifetime EP0984096B1 (de)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
FI981897A FI108465B (sv)	1998-09-04	1998-09-04	F÷rfarande och torkparti f÷r en fiberbanas avvattning
FI981897		1998-09-04

Publications (2)

Publication Number	Publication Date
EP0984096A1 true EP0984096A1 (de)	2000-03-08
EP0984096B1 EP0984096B1 (de)	2004-11-24

Family

ID=8552421

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP99660137A Expired - Lifetime EP0984096B1 (de)	1998-09-04	1999-09-03	Verfahren und Trockenpartie zum Trocknen einer Faserstoffbahn

Country Status (4)

Country	Link
EP (1)	EP0984096B1 (de)
AT (1)	ATE283389T1 (de)
DE (1)	DE69922101T2 (de)
FI (1)	FI108465B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10204698A1 (de) *	2002-02-06	2003-08-07	Voith Paper Patent Gmbh	Zwickelblasrohr
CN102677519A (zh) *	2011-03-11	2012-09-19	河南江河纸业股份有限公司	太阳能环保干燥部

Citations (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4378207A (en) *	1979-11-16	1983-03-29	Smith Thomas M	Infra-red treatment
DE19748708A1 (de) *	1996-11-04	1998-05-07	Andritz Patentverwaltung	Verfahren und Vorrichtung zur Aufwärmung einer Faserstoffbahn

1998
- 1998-09-04 FI FI981897A patent/FI108465B/sv active
1999
- 1999-09-03 EP EP99660137A patent/EP0984096B1/de not_active Expired - Lifetime
- 1999-09-03 DE DE69922101T patent/DE69922101T2/de not_active Expired - Fee Related
- 1999-09-03 AT AT99660137T patent/ATE283389T1/de not_active IP Right Cessation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4378207A (en) *	1979-11-16	1983-03-29	Smith Thomas M	Infra-red treatment
DE19748708A1 (de) *	1996-11-04	1998-05-07	Andritz Patentverwaltung	Verfahren und Vorrichtung zur Aufwärmung einer Faserstoffbahn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE10204698A1 (de) *	2002-02-06	2003-08-07	Voith Paper Patent Gmbh	Zwickelblasrohr
CN102677519A (zh) *	2011-03-11	2012-09-19	河南江河纸业股份有限公司	太阳能环保干燥部
CN102677519B (zh) *	2011-03-11	2014-11-05	河南江河纸业股份有限公司	太阳能环保干燥部

Also Published As

Publication number	Publication date
FI981897A (fi)	2000-03-05
FI108465B (sv)	2002-01-31
FI981897A0 (fi)	1998-09-04
ATE283389T1 (de)	2004-12-15
EP0984096B1 (de)	2004-11-24
DE69922101D1 (de)	2004-12-30
DE69922101T2 (de)	2005-12-01

Publication	Publication Date	Title
CN1096529C (zh)	2002-12-18	纸的烘干方法与造纸机的干燥部
US8486229B2 (en)	2013-07-16	Device for drying and treating a tissue paper web
US5771603A (en)	1998-06-30	Dryer section
CN1077636C (zh)	2002-01-09	在造纸机后部烘缸烘干表面处理的纸幅的方法和后部烘缸
JP2862787B2 (ja)	1999-03-03	塗被紙の製造方法
US6372090B1 (en)	2002-04-16	Method and apparatus for handling paper or cardboard webs
EP0984096B1 (de)	2004-11-24	Verfahren und Trockenpartie zum Trocknen einer Faserstoffbahn
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EP1102889B1 (de)	2004-02-18	Verfahren und vorrichtung zur trocknung einer beschichteten bahn
JP2625334B2 (ja)	1997-07-02	巻取紙の製造方法
US11702796B2 (en)	2023-07-18	Device and method for producing a pulp web
FI81625B (fi)	1990-07-31	Anordning foer torkning av en fiberbana.
US6484418B1 (en)	2002-11-26	Yankee drying hood and method comprising angled impingement nozzles
EP0966564B1 (de)	2002-05-22	Verfahren und vorrichtung zur trocknung einer faserbahn
CN1856619B (zh)	2010-12-08	一种用于在造纸机/纸板机的干燥部以及位于干燥部后的整饰设备中处理纤维纸幅的方法
US6436239B2 (en)	2002-08-20	Method to reduce the adhesion of a damp fibrous material web to a rotating roll
US6742280B1 (en)	2004-06-01	Method in drying of paper
US3401463A (en)	1968-09-17	High-speed paper making system and method
WO2008145519A1 (en)	2008-12-04	A method and an apparatus for drying a chemical pulp web
US6159343A (en)	2000-12-12	Press-to-dryer apparatus
CN1375394A (zh)	2002-10-23	一种可缩短纸板上光烘干和压光过程的方法
Polat et al.	0	35 Drying of Pulp and Paper
EP2708645A1 (de)	2014-03-19	Anordnung und Verfahren zum Herstellen eines beschichteten Kartons
JPH0978484A (ja)	1997-03-25	抄紙機用ドライヤ

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