WO1998012379A1 - 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
- WO1998012379A1 WO1998012379A1 PCT/FI1997/000531 FI9700531W WO9812379A1 WO 1998012379 A1 WO1998012379 A1 WO 1998012379A1 FI 9700531 W FI9700531 W FI 9700531W WO 9812379 A1 WO9812379 A1 WO 9812379A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dryer
- paper web
- wire draw
- groups
- group
- Prior art date
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
- D21F5/04—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 lo 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 object of the present invention is further development of the solutions suggested in said application so that the tendency of curling of paper can be controlled more efficiently in the after-dryer. It is a further object of the invention to provide such a solution for an after-dryer as is suitable for use in particular in dryer sections in which it has not been possible or desirable to control the curling of the paper web in the forward dryer.
- the method in accordance with the invention is mainly characterized in that in the after-dryer the paper web is dried 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 at least one dryer group that applies 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 Nl 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 dryer section was run normally, in which case the curling was measured as 1.5...2 cm, and when the bottom face of the web was steam-treated in the way mentioned above, the web was no longer curled at all.
- 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. After this, there follow 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. After the dryer groups, after the guide roll 184, the dried paper web W is passed, in compliance with what is shown in Fig.
- suction cylinders marketed by the applicant with the trade mark "VAC-ROLL”TM and provided with no inside suction box, reference being made, with respect to the details of the constructions of said rolls, to the applicant's FI Patent No. 83,680 (equivalent US Patents Nos. 5,022, 163 and 5, 172,491).
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97919059A 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 |
JP51431898A JP4027987B2 (en) | 1996-09-20 | 1997-09-09 | Method for drying surface-treated waste paper web or equivalent in post-drying machine of paper machine and post-drying machine for implementing the method in paper machine |
AU43027/97A AU4302797A (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 |
CA002266780A CA2266780C (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 |
AT97919059T ATE258619T1 (en) | 1996-09-20 | 1997-09-09 | METHOD FOR DRYING SURFACE-TREATED PAPER IN A POST-DRYER OF A PAPER MACHINE AND POST-DRYER FOR CARRYING OUT THE METHOD IN A PAPER MACHINE |
DE69727401T DE69727401T2 (en) | 1996-09-20 | 1997-09-09 | METHOD FOR DRYING SURFACE TREATED PAPER IN A NIGHT DRYER OF A PAPER MACHINE, AND NIGHT DRYER FOR CARRYING OUT THE METHOD IN A PAPER MACHINE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI963734 | 1996-09-20 | ||
FI963734A FI101488B (en) | 1996-09-20 | 1996-09-20 | Method for drying a surface-treated paper web or the like in a post-drying section of a special paper machine and a post-drying section of a paper machine applying the method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998012379A1 true WO1998012379A1 (en) | 1998-03-26 |
Family
ID=8546714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP1015689B1 (en) |
JP (1) | JP4027987B2 (en) |
KR (1) | KR100487017B1 (en) |
CN (1) | CN1077636C (en) |
AT (1) | ATE258619T1 (en) |
AU (1) | AU4302797A (en) |
CA (1) | CA2266780C (en) |
DE (1) | DE69727401T2 (en) |
FI (1) | FI101488B (en) |
WO (1) | WO1998012379A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10318250A1 (en) * | 2003-04-23 | 2004-11-11 | Voith Paper Patent Gmbh | Drying assembly of papermaking machine, has series of drying cylinders inclined with respect to the horizontal, in direction of web advance |
WO2004099495A1 (en) * | 2003-05-08 | 2004-11-18 | Metso Paper, Inc. | Method for control of the curl of paper in the treatment of surface-sized paper, and finishing section of a paper machine |
Families Citing this family (10)
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 (en) * | 1999-05-10 | 2000-12-29 | Valmet Corp | Blow arrangement and method for compensating the curl tendency of paper or cardboard webs and a paper or cardboard machine |
FI118387B (en) | 2006-02-15 | 2007-10-31 | Metso Paper Inc | Process in connection with the manufacture of a surface glued fiber web, in particular a paper or cardboard web |
FI20075012A0 (en) | 2007-01-11 | 2007-01-11 | Metso Paper Inc | A method for treating a coated / surface-bonded paper or board web in a paper or board machine finishing section and a paper or board machine finishing section |
CN103669098B (en) * | 2012-09-10 | 2017-09-22 | 国能纸业有限公司 | For the frame for the multi-cylinder long mesh paper machine for producing high filler paper |
CN103669097B (en) * | 2012-09-10 | 2017-06-16 | 国能纸业有限公司 | A kind of multi-cylinder long mesh paper machine for producing filler paper high |
CN103669089A (en) * | 2012-09-10 | 2014-03-26 | 国能纸业有限公司 | Rear drying system used for multi-cylinder long mesh paper machine |
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 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0726353A2 (en) * | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
-
1996
- 1996-09-20 FI FI963734A patent/FI101488B/en active
-
1997
- 1997-09-09 AU AU43027/97A patent/AU4302797A/en not_active Abandoned
- 1997-09-09 EP EP97919059A patent/EP1015689B1/en not_active Expired - Lifetime
- 1997-09-09 KR KR10-1999-7002411A patent/KR100487017B1/en not_active IP Right Cessation
- 1997-09-09 WO PCT/FI1997/000531 patent/WO1998012379A1/en active IP Right Grant
- 1997-09-09 CA CA002266780A patent/CA2266780C/en not_active Expired - Fee Related
- 1997-09-09 JP JP51431898A patent/JP4027987B2/en not_active Expired - Fee Related
- 1997-09-09 AT AT97919059T patent/ATE258619T1/en active
- 1997-09-09 DE DE69727401T patent/DE69727401T2/en not_active Expired - Lifetime
- 1997-09-09 CN CN97198079A patent/CN1077636C/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0726353A2 (en) * | 1995-02-01 | 1996-08-14 | Valmet Corporation | Method for producing surface-treated paper and dry end of a paper machine |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10318250A1 (en) * | 2003-04-23 | 2004-11-11 | Voith Paper Patent Gmbh | Drying assembly of papermaking machine, has series of drying cylinders inclined with respect to the horizontal, in direction of web advance |
WO2004099495A1 (en) * | 2003-05-08 | 2004-11-18 | Metso Paper, Inc. | Method for control of the curl of paper in the treatment of surface-sized paper, and finishing section of a paper machine |
GB2416582A (en) * | 2003-05-08 | 2006-02-01 | Metso Paper Inc | Method for control of the curl of paper in the treatment of surface-sized paper,and finishing section of a paper machine |
GB2416582B (en) * | 2003-05-08 | 2007-02-21 | Metso Paper Inc | Method for control of the curl of paper in the treatment of surface-sized paper,and finishing section of a paper machine |
Also Published As
Publication number | Publication date |
---|---|
JP2001500579A (en) | 2001-01-16 |
CA2266780A1 (en) | 1998-03-26 |
FI963734A (en) | 1998-03-21 |
EP1015689A1 (en) | 2000-07-05 |
JP4027987B2 (en) | 2007-12-26 |
CA2266780C (en) | 2007-05-08 |
FI101488B1 (en) | 1998-06-30 |
KR100487017B1 (en) | 2005-05-03 |
FI101488B (en) | 1998-06-30 |
CN1077636C (en) | 2002-01-09 |
CN1231006A (en) | 1999-10-06 |
DE69727401T2 (en) | 2004-07-15 |
KR19990046827A (en) | 1999-07-05 |
DE69727401D1 (en) | 2004-03-04 |
AU4302797A (en) | 1998-04-14 |
ATE258619T1 (en) | 2004-02-15 |
FI963734A0 (en) | 1996-09-20 |
EP1015689B1 (en) | 2004-01-28 |
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Pikulik | 1.1 Approach Flow System The forming process is preceded by an approach flow system that receives the aqueous fiber suspension, or stock, and prepares it for the forming process. Fibres are produced using kraft process or other pulping/bleaching processes (see Bleaching of wood pulps) and the proportions of fibers from different sources are blended here. Drained water from the forming process, known as whitewater, contains useful fibrous material and is continuously recycled back into the stock. Screens and centrifugal cleaners in the approach flow system remove oversize and heavy contaminants from the pulp. Additives such as minerals, pigments and dyes are introduced to make particular grades of paper and paper board. Air bubbles may be removed from the pulp suspension. The mass concentration, or consistency, of the suspension is kept low to prevent fibre flocculation prior to forming and is usually adjusted to a value in the range of 0.5 to 1.5%. |
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