WO1997044524A1 - A method and apparatus for producing lwc-paper - Google Patents
A method and apparatus for producing lwc-paper Download PDFInfo
- Publication number
- WO1997044524A1 WO1997044524A1 PCT/SE1997/000805 SE9700805W WO9744524A1 WO 1997044524 A1 WO1997044524 A1 WO 1997044524A1 SE 9700805 W SE9700805 W SE 9700805W WO 9744524 A1 WO9744524 A1 WO 9744524A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- paper
- temperature
- roll
- calender
- coating
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
- D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
Definitions
- the present invention relates to a method and to an apparatus for producing smooth two-sided coated paper, so-called LWC-paper, where me coating and smoothing processes are carried out immediately after each other.
- the paper may either be coated on both sides at one and the same time, followed by a drying process, or first on one side and after drying, then on the other side, followed by further drying.
- the method can be carried out in accordance with International Patent Application WO,Al, 95/30049, wherein paper is produced in a conventional manner, dried and thereafter coated with a coating mixture on-line, first on one side and then on the other side, whereafter the paper is dried and smoothed. It is also possible to produce the paper and coat the same off-line.
- the object of the invention is to provide a high-gloss LWC-paper with the aid of a compact calender, where coating and calendering are carried out immediately after each other.
- the coating quantity is suitably 7-12 g/m 2 /side.
- this is achieved with a method in which the paper is maintained at a temperature beneath the lignin softening point during the calendering process. This is conveniently achieved by cooling the paper or by the cold roll in one or more roll pairs.
- the paper When coating-smoothing in-line, the paper will have a temperature of 75-90°C at the calender inlet, due to the preceding drying of the coating.
- a hot roll in each roll pair is utilized to heat the coating to a temperature that is sufficiently high to soften the coating.
- a roll surface temperature in the order of 200°C has been found beneficial in this regard. This means that the paper will be further heated between the roll pairs, wherewith paper and coating may reach a temperature in the order of 105°C prior to the inlet between a following roll pair.
- the high temperature also means mat the non-heated roll will obtain a high temperature. This roll therewith becomes softer and the pressure in the roll nip decreases.
- the high paper temperature also causes the paper fibres to soften and be rolled-out, in addition to softening of the coating.
- the soft roll will suitably maintain a hardness of Shore D 90-95 or higher, measured at room temperature.
- the effect of cooling, when cooling is used, is to maintain a greater hardness during the calendering process. This results in an increase in nip pressure.
- the paper web When the paper web maintains a temperature beneath the lignin softening temperature, the paper web itself will not be compressed by the force in the roll nip and the whole of said force will therefore act on the softened coating on the hot side.
- Cooling can be achieved in several ways. For instance, the paper web can be cooled upstream of the calender inlet and also between the calender roll pairs. Cooling can be achieved, for instance, with the aid of cool air or by increasing the distance between coating and drying station and calender respectively and by increasing the spacing between the roll pairs in the calender. It is also possible to cool the soft roll in each roll pair. This can be achieved, for instance, by peimitting the mantle surface of said roll to pass through a cooling medium, which may be liquid or gaseous. CO 2 , air, water are examples of expedient cooling media. It is also possible, for instance, to permit the paper to pass over or between a pair of cold pipes or rolls. These measures may either be applied separately or in combination.
- the invention also relates to apparatus for producing high-gloss LWC-paper, comprising an LWC-paper web coating station in which the paper web is coated on both sides and the coating dried.
- the apparatus includes a compact calender which has at least two roll pairs and which is arranged in line downstream of the coating station, wherein the surface of the hard roll in each roll pair is maintained at a temperature of 150-210°C, suitably about 200°C, and the line pressure is 200-470 kN/m, suitably 300-400 kN/m and then preferably 350-380 kN/m, wherein the machine speed is 900-1,800 m/min., e.g. 1,000 m/min., and wherein means are provided for maintaining the temperature of the paper beneath the lignin softening point as the paper passes through the calender, suitably within a temperature range of 40-100°C, particularly 60-90°C.
- the cooling means may be comprised of one or more cold pipes or rolls that lie close to the paper or against the paper prior to its entry into the calender or during its passage between the roll pairs, or of cooling air means arranged upstream of the calender inlet and/or between the roll pairs of the calender, or of means operable in cooling the surface of the non-heated roll in one or more roll pairs. Cooling can also be achieved by increasing the distance between coating station and calender and/or increasing the distance between the calender pairs. A combination of these means may also be used.
- the invention also relates to plant for the manufacture of high-gloss LWC-paper, comprising a paper machine in line with an inventive apparatus.
- the temperature of the paper is measured upstream of the inlet in the first roll pair, stack 1, between the stacks, and downstream of stack 2, with both stacks closed, with only one stack closed or with both stacks open.
- the density, gloss (top side and bottom side) and surface smoothness (PPS) of the paper coating are also measured under the same conditions. The results are set forth in the following Tables. The test conditions were as follows:
- Machine speed 1,000 m/min.
- the elasticity modulus of a soft calender coating having a hardness of 91 ShD at room temperature was also measured at increasing temperatures.
- the enclosed Figure illustrates the elasticity modulus in dependence on temperatures.
- the elasticity modulus decreases by about 1 MPa between 50 and 105°C and the elasticity thus greatly increases. Consequently, cooling of the roll surface can result in a considerable increase in nip pressure.
Landscapes
- Paper (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU29846/97A AU2984697A (en) | 1996-05-20 | 1997-05-16 | A method and apparatus for producing lwc-paper |
EP97924426A EP0907798A1 (en) | 1996-05-20 | 1997-05-16 | A method and apparatus for producing lwc-paper |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9601907A SE506597C2 (en) | 1996-05-20 | 1996-05-20 | Method and apparatus for making LWC paper |
SE9601907-0 | 1996-05-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997044524A1 true WO1997044524A1 (en) | 1997-11-27 |
Family
ID=20402621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/000805 WO1997044524A1 (en) | 1996-05-20 | 1997-05-16 | A method and apparatus for producing lwc-paper |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0907798A1 (en) |
AU (1) | AU2984697A (en) |
SE (1) | SE506597C2 (en) |
WO (1) | WO1997044524A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003064762A1 (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 |
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 |
WO2003064764A1 (en) * | 2002-01-29 | 2003-08-07 | Metso Paper, Inc. | Processing device for processing a coated or uncoated fibrous web |
US6893536B2 (en) | 2000-01-28 | 2005-05-17 | M-Real Oyj | Process and coating composition for coating a paper web |
WO2005121446A1 (en) * | 2004-06-09 | 2005-12-22 | Voith Patent Gmbh | Method for producing a paper web and paper-making machine |
US20110003079A1 (en) * | 2008-03-21 | 2011-01-06 | Takehiro Yoshimatsu | Processes for preparing coated papers |
US8349443B2 (en) | 2006-02-23 | 2013-01-08 | Meadwestvaco Corporation | Method for treating a substrate |
EP2603636A1 (en) * | 2010-08-12 | 2013-06-19 | Stora Enso Oyj | A method for the surface treatment of paper or board and a paper or board produced according to the method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995030049A1 (en) * | 1994-04-28 | 1995-11-09 | Voith Sulzer Papiermaschinen Gmbh | Process and device for producing paper webs coated on both sides |
-
1996
- 1996-05-20 SE SE9601907A patent/SE506597C2/en not_active IP Right Cessation
-
1997
- 1997-05-16 AU AU29846/97A patent/AU2984697A/en not_active Abandoned
- 1997-05-16 EP EP97924426A patent/EP0907798A1/en not_active Withdrawn
- 1997-05-16 WO PCT/SE1997/000805 patent/WO1997044524A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995030049A1 (en) * | 1994-04-28 | 1995-11-09 | Voith Sulzer Papiermaschinen Gmbh | Process and device for producing paper webs coated on both sides |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6893536B2 (en) | 2000-01-28 | 2005-05-17 | M-Real Oyj | Process and coating composition for coating a paper web |
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 |
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 |
CN100371529C (en) * | 2002-01-29 | 2008-02-27 | 梅特索纸业有限公司 | Processing device and method of operating the device for processing a coated or uncoated fibrous web |
WO2003064762A1 (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 |
WO2003064764A1 (en) * | 2002-01-29 | 2003-08-07 | Metso Paper, Inc. | Processing device for processing a coated or uncoated fibrous web |
CN1625629B (en) * | 2002-01-29 | 2012-06-27 | 梅特索纸业有限公司 | Processing device for processing a coated or uncoated fibrous |
WO2005121446A1 (en) * | 2004-06-09 | 2005-12-22 | Voith Patent Gmbh | Method for producing a paper web and paper-making machine |
US8349443B2 (en) | 2006-02-23 | 2013-01-08 | Meadwestvaco Corporation | Method for treating a substrate |
US8673398B2 (en) | 2006-02-23 | 2014-03-18 | Meadwestvaco Corporation | Method for treating a substrate |
EP2273009A1 (en) * | 2008-03-21 | 2011-01-12 | Nippon Paper Industries Co., Ltd. | Method for producing coated paper |
EP2273009A4 (en) * | 2008-03-21 | 2013-03-27 | Jujo Paper Co Ltd | Method for producing coated paper |
US20110003079A1 (en) * | 2008-03-21 | 2011-01-06 | Takehiro Yoshimatsu | Processes for preparing coated papers |
EP2603636A1 (en) * | 2010-08-12 | 2013-06-19 | Stora Enso Oyj | A method for the surface treatment of paper or board and a paper or board produced according to the method |
EP2603636A4 (en) * | 2010-08-12 | 2014-10-22 | Stora Enso Oyj | A method for the surface treatment of paper or board and a paper or board produced according to the method |
Also Published As
Publication number | Publication date |
---|---|
AU2984697A (en) | 1997-12-09 |
SE9601907L (en) | 1997-11-21 |
SE506597C2 (en) | 1998-01-19 |
SE9601907D0 (en) | 1996-05-20 |
EP0907798A1 (en) | 1999-04-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0617165B1 (en) | Method of calendering a paper web and a calender that makes use of the method | |
US6397739B1 (en) | Calendering method and a calender that makes use of the method | |
US6497790B2 (en) | Paperboard of improved smoothness and bulk | |
US4738197A (en) | Cooling of a paper web in a supercalender | |
EP0719891B1 (en) | Method and apparatus for calendering a paper or board web | |
JPH02127585A (en) | Transformation of pressed woven fabric in paper-making machine | |
US5316624A (en) | Method and apparatus for high density paper | |
US4847116A (en) | Method for depositing particles and a binder system on a base fabric | |
JP3292684B2 (en) | Method of manufacturing glossy coated paper | |
WO1997044524A1 (en) | A method and apparatus for producing lwc-paper | |
DE69834675T2 (en) | Device for applying air to a web | |
JP2003529683A (en) | Method and arrangement for controlling moisture in a multi-roll calendar | |
EP0539271B1 (en) | Method for improving the printability of web offset paper | |
US3362869A (en) | Method of forming machine glazed extensible paper | |
US3190212A (en) | Gloss calender | |
US6733632B2 (en) | Process and apparatus for the on-line calendering of SC-A paper | |
EP0840821B1 (en) | Method of calendering of a paper web and a calender that makes use of the method | |
WO2002000998A1 (en) | Precalendering method, finishing method and apparatus for implementing the methods | |
JP2003522849A (en) | Method and apparatus for calendaring | |
EP1208266B1 (en) | Method and arrangement for surface treatment of a paper and/or board web | |
EP0369552A2 (en) | Method for calendering paper and paper manufactured by the method | |
WO1998027272A1 (en) | Method of and arrangement for treating a fiber web | |
JPH04361686A (en) | Production of newspaper blank form and the same | |
US3359643A (en) | Production of paper | |
US6475342B1 (en) | Method of and arrangement for treating a fiber web |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK TJ TM TR TT UA UG US UZ VN YU AM AZ BY KG KZ MD RU TJ TM |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH KE LS MW SD SZ UG AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWE | Wipo information: entry into national phase |
Ref document number: 1997924426 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: JP Ref document number: 97542150 Format of ref document f/p: F |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
WWP | Wipo information: published in national office |
Ref document number: 1997924426 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: CA |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1997924426 Country of ref document: EP |