EP0478525B1 - Procedure and apparatus for glazing a paper or cardboard web - Google Patents

Procedure and apparatus for glazing a paper or cardboard web Download PDF

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Publication number
EP0478525B1
EP0478525B1 EP91850230A EP91850230A EP0478525B1 EP 0478525 B1 EP0478525 B1 EP 0478525B1 EP 91850230 A EP91850230 A EP 91850230A EP 91850230 A EP91850230 A EP 91850230A EP 0478525 B1 EP0478525 B1 EP 0478525B1
Authority
EP
European Patent Office
Prior art keywords
web
coating
belt
drying
conducted
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
Application number
EP91850230A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0478525A2 (en
EP0478525A3 (en
Inventor
Ilkka Kartovaara
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.)
KESKUSLABORATORIO - CENTRALLABORATORIUM Oy AB
Original Assignee
KESKUSLABORATORIO - CENTRALLABORATORIUM Oy AB
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.)
Filing date
Publication date
Application filed by KESKUSLABORATORIO - CENTRALLABORATORIUM Oy AB filed Critical KESKUSLABORATORIO - CENTRALLABORATORIUM Oy AB
Publication of EP0478525A2 publication Critical patent/EP0478525A2/en
Publication of EP0478525A3 publication Critical patent/EP0478525A3/en
Application granted granted Critical
Publication of EP0478525B1 publication Critical patent/EP0478525B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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 present invention concerns a procedure for glazing a paper or cardboard web, a coating being applied on one side of the web, the web being dried and the coating glazed, as defined in the preamble of claim 1 (CH-A-359 354).
  • the invention further concerns apparatus for glazing a paper or cardboard web, comprising a coating means and a drying means, as defined in the preamble of claim 5.
  • the methods used to perform glazing of paper and cardboard can be classified by two main groups.
  • To the first main group belong those procedures in which the paper is coated in conventional manner and the coating, dried close to its ultimate dry matter content, is glossed.
  • This group includes several greatly different techniques, such as e.g. brush glossing and high-gloss calendering.
  • the second main group consists of those procedures in which the coating is dried and glazed on one glossy drying cylinder. This process is known as coast coating.
  • the pigment coating is first dried, using convection and radiation drying procedures of prior art, and thereafter glossed, using brush glossing or high-gloss calendering. It is however usually necessary to varnish such cardboard which is meant to be printed on, owing to insufficient gloss.
  • Coast coating gives substantially better gloss than, for instance, brush glossing and high-gloss calendering. Moreover the bulk is not lessened in coast coating.
  • the coast coating technique in present use cannot be applied as an on-line process on paper or cardboard machines. This is because the highest running speeds of modern cardboard machines are on the order of 400 to 600 m/min, and paper machines have running speeds up to the order of 1300 m/min. In contrast, the highest feasible running speed in coast coating is on the order of about 100 m/min.
  • the low speed of coast coating is due to the fact that the water to be evaporated from the coating has to be removed on one cylinder through the base web, that is, the wet coating is conducted against a polished cylinder and dewatered through the opposite side of the web.
  • the largest possible cylinder diameter is on the order of about 5 m, and this imposes a limit on the region that is available for evaporation, and thus on the drying capacity of the entire process.
  • the object of the present invention is to eliminate these drawbacks. It is a particular object of the invention, to further develop the coast coating process so that its effectiveness, and the capacity of the coast coating machine, can be raised to be higher than before, retaining at the same time the advantages that can be gained with coast coating.
  • the evaporation rate is affected by the partial pressure of the evaporating substance, that is water, in the close neighbourhood of the evaporation surface compared with the pressure of saturated vapour corresponding to the temperature in the case, and to the partial pressure of any other gases in the region. If drying takes place under atmospheric pressure, the partial pressure of air will be substantially higher than the partial pressure of water vapour. Presence of air retards the evaporation of water substantially. The evaporation rate can be multiplied by removing the air.
  • Condebelt technique has been employed in connection with papermaking to dry the web.
  • the Condebelt technique is based on the expedient of reducing the air pressure in the pores of the web prior to drying, in addition to which the water vapour produced by evaporation is condensed by cooling, in order to keep the partial pressure of water vapour as low as possible in the evaporating region.
  • the Condebelt technique has not heretofore been used in connection with drying a coating, to say nothing of glazing a coating.
  • the present invention is based on utilization of the Condebelt technique in connection with coating paper and/or cardboard, and in particular with its glazing.
  • the coated side of the paper or cardboard web, dry matter content of the coating less than 80% is contacted with a heated, smooth, endless and thermally well conductive surface, such as a burnished metal belt, and the opposite side of the web is contacted with a cooled belt, such as a drying felt or equivalent.
  • the moisture present in the coating will then move through the web and it will depart from the web through the opposite side of the web while the coating is in contact with the smooth surface of the belt, so that the gloss of the coating increases during the drying process.
  • the Condebelt technique known in itself in the art in connection with paper drying, is utilized, the coating being, in addition to drying, glazed with the aid of said technique in contact with a smooth belt, e.g. a metallic belt, the coating thus being simultaneously glazed in conjunction with drying.
  • the evaporation rate is multiplied as compared with traditional techniques, by lowering the partial pressure of air and water vapour in the pores of the web.
  • the specific novelty of the procedure is seen in the simultaneous drying and glazing of the coating. Production of gloss is based, in this procedure, on the fact that the exceedingly smooth and glossy metal surface is replicated on the surface of the wet, and malleable, surface of the coating.
  • the running speeds can be substantially increased in conjunction with paper coating and glazing.
  • a paper or cardboard web can even be coated in an on-line process adjoined to a paper or cardboard machine.
  • the power applied in drying the coating can be raised to desired level because in the Condebelt technique a metallic belt is used for heat transmitter, instead of a cylinder, and this belt can be made as long as seems desirable, without its imposing any limits on the evaporation distance. If desired, and whenever the drying capacity requires, it is also possible to join a plurality of Condebelt units in succession so that the desired drying capacity will be achieved.
  • the coated side of the web that is the coating
  • the surface of a heated, smooth and endless belt with good thermal conductivity immediately after applying the coating and while the coating is moist, dry matter content less than 80%, advantageously less than 70%.
  • a novel embodiment of the pour coating technique is now concerned.
  • the drying technique here employed, the Condebelt technique is in itself previously known e.g. through the Finnish Patents FI-54514, FI-55539 and FI-59635, which are here included by reference.
  • the drying technique and associated vacuum technique known through the references cited, or otherwise, may be applied.
  • Fig. 1 is depicted an apparatus according to the invention for glazing a cardboard web.
  • the apparatus comprises a coating means 4 and a drying means 5.
  • the coating means 4 comprises a conventional applicator roll 15 for spreading the coating material on the surface of the web 1, a doctor blade 16 for levelling the coating, and a backing roll 17, which the web is conducted to lap, running in the direction indicated by arrow 18.
  • the coating means may be any kind of coating means applied in itself in connection with coating paper and/or cardboard.
  • the drying means 5 comprises an endless, thermally well conductive, polished metallic belt 2, and a heating means 7 for heating this belt e.g. with the aid of steam.
  • the belt 2 is disposed immediately after the coating means 4 in that the web 1 has been conducted onto the belt immediately after the coating means, with the coating against the polished face of the belt so that the dry matter content of the coating is less than 80% by weight when the coating is being conducted against the belt 2.
  • the drying means 5 comprises a drying felt 1' with rolls 12 and drying apparatus 13.
  • the drying felt is conducted to run around the rolls 12 in the travelling direction of the web with a speed consistent with that of the web, i.e., of the belt 2.
  • the drying means 5 further comprises and endless, and thermally well conductive, belt 2' with associated rolls and cooling member 8; the belt 2' is conducted to run around the rolls 6' in the direction of travel of the web.
  • the belts 2 and 2' constitute a pair of belts in which the belts run in parallel between the rolls 6 and 6', respectively, pressed against each other.
  • the drying felt 1' and the web disposed upon this drying felt are conducted in between the belts 2,2'.
  • the polished belt 2 lying against the coating is heated with the aid of a heating means 7; the drying felt under the web is continuously cooled with the cooling means 8 of the belt 1'.
  • the moisture will then move from the coating through the web 2 into the drying felt, and it will condense therein.
  • the drying felt is continuously dried with the aid of the drying means 13, as it makes its circuit of the rolls 12. After passing through the drying means 5, the web is released from the drying felt and conducted to another drying means 5' operating according to the Condebelt technique.
  • the web Prior to being conducted into contact with the belt 2, the web has been subjected to vacuum treatment for air removal from the web, that is for reducing the air pressure within the web and the drying felt, in order to enhance the drying process.
  • Web and drying felt are conducted in between the belt 2 immediately following vacuum treatment.
  • the belts 2 and 2' are impermeable to air, and the vacuum treatment of web and felt lowers the air pressure in the web and in the felt, this promoting the drying of the web as the partial pressure of air in the felt is lower than before and thereby the partial pressure of water vapour is enabled to be higher than normal.
  • the heating means 7 of the belt 2 may be any heating means whatsoever, e.g. electric, gas flame-operated, steam-operated, etc.
  • the heating means may further comprise e.g. a liquid removal means for eliminating the condensed steam.
  • the cooling means serving the belt 2' and the felt 1' may be any kind of cooling means known in itself in the art, e.g. one operating with a cooled fluid.
  • the drying means 13 serving the felt 1' may be any kind of drying means known in itself in the art, for instance one based on pressure rolls, a heating appliance, vacuum apparatus, etc.
  • the vacuum means 10 may be of any kind whatsoever, based e.g. on vacuum chambers connected with pipelines 20 to a vacuum pump, and sealed against the web 1 and/or the felt 1'.
  • the web 1 is carried in between two belts 2,2' impermeable to air, e.g. of metal, upon a felt 1'.
  • the web may alternatively be conducted to lie against the belt 2, merely upon the felt 1', in which case the cooling means 8 is disposed to cool the felt directly.
  • the felt may in that case be either impermeable or permeable to air.

Landscapes

  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
EP91850230A 1990-09-20 1991-09-20 Procedure and apparatus for glazing a paper or cardboard web Expired - Lifetime EP0478525B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI904638A FI90366C (fi) 1990-09-20 1990-09-20 Menetelmä ja laitteisto paperi- tai kartonkirainan kiillottamiseksi
FI904638 1990-09-24

Publications (3)

Publication Number Publication Date
EP0478525A2 EP0478525A2 (en) 1992-04-01
EP0478525A3 EP0478525A3 (en) 1992-07-22
EP0478525B1 true EP0478525B1 (en) 1996-02-28

Family

ID=8531092

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91850230A Expired - Lifetime EP0478525B1 (en) 1990-09-20 1991-09-20 Procedure and apparatus for glazing a paper or cardboard web

Country Status (7)

Country Link
EP (1) EP0478525B1 (ja)
JP (1) JP3090731B2 (ja)
AT (1) ATE134730T1 (ja)
CA (1) CA2051579C (ja)
DE (1) DE69117412T2 (ja)
FI (1) FI90366C (ja)
NO (1) NO178202C (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10157723A1 (de) * 2001-11-24 2003-06-12 Voith Paper Patent Gmbh Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn
US6701637B2 (en) 2001-04-20 2004-03-09 Kimberly-Clark Worldwide, Inc. Systems for tissue dried with metal bands

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI980106A (fi) 1998-01-19 1999-07-20 Idi Head Oy Pinnankäsittelymenetelmä etenkin rainojen barrieri- ja painatusominais uuksien parantamiseksi
DE19952204B4 (de) * 1999-10-29 2004-02-05 Man Roland Druckmaschinen Ag Verfahren und Vorrichtung zum Verarbeiten von Bogenmaterial in einer Rotationsdruckmaschine
FI20000734A0 (fi) * 2000-03-30 2000-03-30 Valmet Corp Menetelmä ja sovitelma päällystetyn ja kiillotetun papering tai kartongin valmistamiseksi
FI119564B (fi) * 2001-03-09 2008-12-31 Metso Paper Inc Menetelmä ja järjestely painopaperin valmistuksessa
DE112005001564T5 (de) * 2004-07-02 2008-08-28 Metso Paper, Inc. Verfahren zum Streichen einer Faserbahn
JP4619328B2 (ja) * 2006-07-31 2011-01-26 大王製紙株式会社 片艶クラフト紙及びその製造方法
EP2708645A1 (en) * 2012-09-17 2014-03-19 Metso Paper Inc. An arrangement and a method for producing coated board

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1098348B (de) * 1954-04-26 1961-01-26 Richard Billhoefer Maschinenfa Kalander zum Herstellen von Hochglanz auf mit Lackueberzuegen versehenen Papieren, Pappen od. dgl.
CH359354A (fr) * 1958-12-18 1961-12-31 Weustenraad Alfred Procédé de glaçage d'une couche de résine recouvrant une feuille de papier ou matière similaire et installation pour la mise en oeuvre de ce procédé
GB887737A (en) * 1959-02-26 1962-01-24 Technical Waxes Ltd Improvements relating to apparatus and methods for glaze coating paper and the like
GB2136027B (en) * 1983-03-03 1986-09-24 Matsumoto Kikai Manufacturing Calendering sheet paper
US4624744A (en) * 1984-05-18 1986-11-25 S. D. Warren Company Method of finishing paper utilizing substrata thermal molding
FI80102C (fi) * 1988-07-01 1990-04-10 Tampella Oy Ab Foerfarande och anordning foer torkning av en fiberbana.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6701637B2 (en) 2001-04-20 2004-03-09 Kimberly-Clark Worldwide, Inc. Systems for tissue dried with metal bands
DE10157723A1 (de) * 2001-11-24 2003-06-12 Voith Paper Patent Gmbh Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn
DE10157723B4 (de) * 2001-11-24 2005-12-22 Voith Paper Patent Gmbh Vorrichtung und Verfahren zum Glätten einer Papier- oder Kartonbahn

Also Published As

Publication number Publication date
ATE134730T1 (de) 1996-03-15
EP0478525A2 (en) 1992-04-01
FI904638A0 (fi) 1990-09-20
JPH04257393A (ja) 1992-09-11
FI90366C (fi) 1994-01-25
CA2051579C (en) 2005-06-14
NO913654D0 (no) 1991-09-17
DE69117412T2 (de) 1996-10-24
EP0478525A3 (en) 1992-07-22
CA2051579A1 (en) 1992-03-25
NO913654L (no) 1992-03-25
NO178202B (no) 1995-10-30
FI90366B (fi) 1993-10-15
FI904638A (fi) 1992-03-25
JP3090731B2 (ja) 2000-09-25
DE69117412D1 (de) 1996-04-04
NO178202C (no) 1996-02-07

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