EP1015689B1 - Method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine and after-dryer carrying out the method in a paper machine - Google Patents
Method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine and after-dryer carrying out the method in a paper machine Download PDFInfo
- Publication number
- EP1015689B1 EP1015689B1 EP97919059A EP97919059A EP1015689B1 EP 1015689 B1 EP1015689 B1 EP 1015689B1 EP 97919059 A EP97919059 A EP 97919059A EP 97919059 A EP97919059 A EP 97919059A EP 1015689 B1 EP1015689 B1 EP 1015689B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dryer
- paper web
- web
- paper
- groups
- 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.)
- Expired - Lifetime
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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
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/009—Apparatus for glaze-coating paper webs
Definitions
- the invention concerns a method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine, in which method the paper web is first finished in a finishing section, in which finishing section the paper web is surface-sized or coated by means of a finishing device, after which the paper web is dried.
- the invention also concerns an after-dryer for a paper machine for applying the method in accordance with the present invention to the drying of a surface-treated paper web or equivalent, which after-dryer is placed after the finishing device, by means of which finishing device the paper web is surface-sized or coated.
- twin-wire draw and/or single-wire draw is/are employed.
- twin-wire draw the groups of drying cylinders comprise two wires, which press the web one from above and the other one from below against heated cylinder faces. Between the rows of drying cylinders, which are usually horizontal rows, the web has free and unsupported draws, which are susceptible of fluttering, which may cause web breaks, in particular so when the web is still relatively moist and, therefore, of low strength.
- each group of drying cylinders includes just one drying wire, on whose support the web runs through the whole group so that the drying wire presses the web on the drying cylinders against the heated cylinder faces, whereas on the reversing cylinders or rolls between the drying cylinders the web remains at the side of the outside curve.
- the drying cylinders are placed outside the wire loop, and the reversing cylinders or rolls inside said loop.
- the tendency of curling of paper is already affected in connection with the web formation, in particular at the sheet formation stage by means of selection of the difference in speed between the slice jet and the wire, and by means of other running parameters.
- a suitable initial curl form is regulated for the sheet in order that the curling of the paper after one-sided or double-sided copying could be optimized.
- the reactivity of curling i.e. the extent to which curling occurs per unit of change in moisture content, is affected to a greater extent by means of a multi-layer structure of the paper, which is produced in connection with the web formation in the wet end.
- the method in accordance with the invention is mainly characterized in that in the after-dryer the paper web is dried only in a dryer group/groups making use of a normal single-wire draw, and that, in connection with or after the drying, the paper web is treated by means of a device/devices in order to compensate for a tendency of curling of the paper web.
- the after-dryer that makes use of the method of the present invention is mainly characterized in that the after-dryer comprises only a dryer group/dryer groups that apply a normal single-wire draw so as to dry the paper web and a device/devices for compensating for a tendency of curling of the paper web.
- the web is supported over the entire length of the dryer section, in which case the runnability is very good. Possible curling of the web is compensated for, for example, by means of steam boxes and/or by means of soft-calendering.
- the web can also be passed to an upper cylinder directly after the coating, in which case the draw is closed right from the beginning of the after-dryer over the entire length of the after-dryer.
- Figure 1 is a schematic illustration of an exemplifying embodiment of an after-dryer, which is composed of a dryer group that applies a normal single-wire draw, and
- Figure 2 is a schematic illustration of an arrangement in which, after the coating, the web is passed directly onto the upper cylinder in the group with single-wire draw over a reversing blow-box or a reversing roll or equivalent, in which case a closed draw is obtained over the entire length.
- the coating device is denoted with the reference numeral 10, and the coating device 10 is, for example, a coating device marketed by the applicant with the name SYM-SIZERTM, which device comprises two opposite coating rolls 11 and 12, in connection with each of which there are size feed devices so that the paper web W is coated from both sides in the coating nip between the rolls 11 and 12.
- the direction of progress of the paper web W is denoted with the reference arrow S.
- the web W is passed over the drying cylinder 171 into the dryer group that applies a normal single-wire draw, in which group the reversing rolls/cylinders, fitted inside the drying-wire loop 176 guided by the guide rolls 177, are denoted with the reference numeral 175 and the drying cylinders are denoted with the reference numeral 174.
- the paper web W to be dried runs from the drying cylinders 174 placed in the upper row RY onto the reversing rolls 175 placed in the lower row RA so that on the drying cylinders 174 the web W is placed against the heated face of the drying cylinder 174, and on the reversing rolls 175 placed in the lower row RA the web W remains at the side of the outside curve on the wire 176.
- the paper web W is passed over the guide roll 195 to the soft calender 191, which comprises two calender nips N1 and N2.
- two steam boxes 192 are also placed, and curling of the paper web W is compensated for by means of the soft-calendering and by means of the steam boxes.
- Over the guide roll 197 the paper web is passed through the nip device 198 to further processing. Between the calendering nips N1,N2 the web is guided over the guide roll 196.
- a pre-drying unit 15 is fitted, which does not contact the web W and which can be an infrared dryer or an airborne web dryer or a combination of same, in itself known from the prior art.
- a blower unit 201 is fitted, by whose means attempts are made to promote evaporation through the wire, i.e. to equalize the distribution of moisture in the direction of thickness in the paper that departs from the after-dryer.
- a steam box 202 in itself known, of the sort described, for example, in the FI Patent Application No.
- a moistening device 202 which is also in itself known, by means of which devices 202 the distribution of moisture in the Z-direction of the web is equalized and/or the curling of the web is reduced. All of these additional devices are, of course, not necessarily in use in the same construction.
- the exemplifying embodiment shown in Fig. 2 is similar to the exemplifying embodiment shown in Fig. 1, but in the embodiment of Fig. 2, after the coating device, a reversing blower device 14 is fitted, by whose means the web is turned so that it is passed directly onto the drying cylinder 174 in the upper row.
- a reversing blower device 14 is fitted, by whose means the web is turned so that it is passed directly onto the drying cylinder 174 in the upper row.
- two dryer groups that apply a normal single-wire draw, and between said groups there is a closed draw.
- the parts in the first dryer group that applies a normal single-wire draw are denoted with the reference denotations corresponding to Fig. 1, and the drying cylinders in the second dryer group are denoted with the reference numeral 182 and the reversing rolls/cylinders with the reference numeral 181.
- the drying wire 186 in the second dryer group runs guided by the guide rolls 187.
- the dried paper web W is passed, in compliance with what is shown in Fig. 1, to the soft calender 191, in whose connection preferably also steam boxes 192 are fitted, in which case it is possible to control the curling of the web W by means of the steam boxes 193 and by regulating the calendering nips N1,N2 of the soft calender 191 in a suitable way.
Landscapes
- Paper (AREA)
- Drying Of Solid Materials (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI963734A FI101488B1 (fi) | 1996-09-20 | 1996-09-20 | Menetelmä pintakäsitellyn paperirainan tai vastaavan kuivaamiseksi paperikoneen jälkikuivatusosassa sekä menetelmää soveltava paperikoneen jälkikuivatusosa |
FI963734 | 1996-09-20 | ||
PCT/FI1997/000531 WO1998012379A1 (en) | 1996-09-20 | 1997-09-09 | Method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine and after-dryer carrying out the method in a paper machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1015689A1 EP1015689A1 (en) | 2000-07-05 |
EP1015689B1 true EP1015689B1 (en) | 2004-01-28 |
Family
ID=8546714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97919059A Expired - Lifetime EP1015689B1 (en) | 1996-09-20 | 1997-09-09 | Method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine and after-dryer carrying out the method in a paper machine |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1015689B1 (fi) |
JP (1) | JP4027987B2 (fi) |
KR (1) | KR100487017B1 (fi) |
CN (1) | CN1077636C (fi) |
AT (1) | ATE258619T1 (fi) |
AU (1) | AU4302797A (fi) |
CA (1) | CA2266780C (fi) |
DE (1) | DE69727401T2 (fi) |
FI (1) | FI101488B1 (fi) |
WO (1) | WO1998012379A1 (fi) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6001421A (en) * | 1996-12-03 | 1999-12-14 | Valmet Corporation | Method for drying paper and a dry end of a paper machine |
US5983523A (en) * | 1997-03-27 | 1999-11-16 | Valmet Corporation | Method for controlling curl of paper in a dryer section of a paper machine and a paper or board machine |
US6038789A (en) * | 1997-05-15 | 2000-03-21 | Valmet Corporation | Method for controlling the curl of paper and a paper or board machine line that applies the method |
FI106269B (fi) * | 1999-05-10 | 2000-12-29 | Valmet Corp | Päällepuhallussovitelma ja -menetelmä käsiteltävän paperi- tai kartonkirainan käyristymistaipumuksen kompensoimiseksi sekä paperi- tai kartonkikone |
DE10318250A1 (de) * | 2003-04-23 | 2004-11-11 | Voith Paper Patent Gmbh | Bahntrocknung |
FI121931B (fi) * | 2003-05-08 | 2011-06-15 | Metso Paper Inc | Menetelmä pintaliimatun paperin, etenkin hienopaperin käsittelyssä paperikoneen jälkikäsittelyosassa sekä paperikoneen jälkikäsittelyosa |
FI118387B (fi) | 2006-02-15 | 2007-10-31 | Metso Paper Inc | Menetelmä pintaliimatun kuiturainan, etenkin pintaliimatun paperi- tai kartonkirainan valmistuksen yhteydessä |
FI20075012A0 (fi) | 2007-01-11 | 2007-01-11 | Metso Paper Inc | Menetelmä päällystetyn/pintaliimatun paperi- tai kartonkirainan käsittelyssä paperi- tai kartonkikoneen jälkikäsittelyosassa sekä paperi- tai kartonkikoneen jälkikäsittelyosa |
CN103669089A (zh) * | 2012-09-10 | 2014-03-26 | 国能纸业有限公司 | 用于长网多缸造纸机上的后烘干*** |
CN103669098B (zh) * | 2012-09-10 | 2017-09-22 | 国能纸业有限公司 | 用于生产高填料纸张的长网多缸造纸机的机架 |
CN103669097B (zh) * | 2012-09-10 | 2017-06-16 | 国能纸业有限公司 | 一种用于生产高填料纸张的长网多缸造纸机 |
EP2765237B1 (en) | 2013-02-06 | 2016-11-23 | Valmet Technologies, Inc. | Method for producing a fiber web and production line for producing a fiber web |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI98387C (fi) * | 1995-02-01 | 1997-06-10 | Valmet Corp | Menetelmä pintakäsiteltävän paperin, etenkin hienopaperin, valmistamiseksi sekä paperikoneen kuivapää |
-
1996
- 1996-09-20 FI FI963734A patent/FI101488B1/fi active
-
1997
- 1997-09-09 WO PCT/FI1997/000531 patent/WO1998012379A1/en active IP Right Grant
- 1997-09-09 CN CN97198079A patent/CN1077636C/zh not_active Expired - Fee Related
- 1997-09-09 AT AT97919059T patent/ATE258619T1/de active
- 1997-09-09 EP EP97919059A patent/EP1015689B1/en not_active Expired - Lifetime
- 1997-09-09 JP JP51431898A patent/JP4027987B2/ja not_active Expired - Fee Related
- 1997-09-09 DE DE69727401T patent/DE69727401T2/de not_active Expired - Lifetime
- 1997-09-09 CA CA002266780A patent/CA2266780C/en not_active Expired - Fee Related
- 1997-09-09 KR KR10-1999-7002411A patent/KR100487017B1/ko not_active IP Right Cessation
- 1997-09-09 AU AU43027/97A patent/AU4302797A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP1015689A1 (en) | 2000-07-05 |
CN1231006A (zh) | 1999-10-06 |
CA2266780A1 (en) | 1998-03-26 |
FI963734A0 (fi) | 1996-09-20 |
KR100487017B1 (ko) | 2005-05-03 |
WO1998012379A1 (en) | 1998-03-26 |
DE69727401D1 (de) | 2004-03-04 |
FI101488B (fi) | 1998-06-30 |
ATE258619T1 (de) | 2004-02-15 |
KR19990046827A (ko) | 1999-07-05 |
JP2001500579A (ja) | 2001-01-16 |
JP4027987B2 (ja) | 2007-12-26 |
DE69727401T2 (de) | 2004-07-15 |
CN1077636C (zh) | 2002-01-09 |
FI963734A (fi) | 1998-03-21 |
FI101488B1 (fi) | 1998-06-30 |
CA2266780C (en) | 2007-05-08 |
AU4302797A (en) | 1998-04-14 |
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