WO1993023615A1 - Procede pour traiter une bande continue de papier dans la section de sechage d'une machine a papier - Google Patents

Procede pour traiter une bande continue de papier dans la section de sechage d'une machine a papier Download PDF

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Publication number
WO1993023615A1
WO1993023615A1 PCT/FI1993/000206 FI9300206W WO9323615A1 WO 1993023615 A1 WO1993023615 A1 WO 1993023615A1 FI 9300206 W FI9300206 W FI 9300206W WO 9323615 A1 WO9323615 A1 WO 9323615A1
Authority
WO
WIPO (PCT)
Prior art keywords
dryer
paper
felt
web
cylinder
Prior art date
Application number
PCT/FI1993/000206
Other languages
English (en)
Inventor
Lauri SEPPÄNEN
Original Assignee
Yhtyneet Paperitehtaat 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.)
Filing date
Publication date
Application filed by Yhtyneet Paperitehtaat Oy filed Critical Yhtyneet Paperitehtaat Oy
Publication of WO1993023615A1 publication Critical patent/WO1993023615A1/fr

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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
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0281—Wet presses in combination with a dryer roll

Definitions

  • the present invention relates to a method for processing a web of paper in the dryer section of a paperma ing machine, wherein a web of paper is subjected to drying by delivering it under the support of at least one dryer felt around dryer cylinders arranged within the dryer section successively in the dryer felt running direction, said dryer felt being adapted to press the web of paper against a dryer cylinder adjacent thereto at any given location in its traveling direction.
  • This type of dryer sections are generally known in paper- making machines and may conprise a number of dryer cylin ⁇ ders, mounted successively in the dryer felt running direction and having axes of rotation that are substantially perpendicular to the dryer felt running direction.
  • a dryer section is provided with at least two separate wires or dryer felts, the first being adapted to travel around an upper tier of dryer cylinders in the dryer section and the second being adapted to travel in a corresponding fashion around a lower tier of dryer cylinders in the dryer section, whereby a web of paper is adapted to be guided alternately from the upper tier of dryer cylinders to the lower tier of dryer cylinders always to a dryer cylinder that is next in the web traveling direction in a manner such that a web of paper progresses from the dryer felt of said upper tier of dryer cylinders onto that of said lower tier of dryer cylinders as a so-called open draw.
  • the dryer section is particularly provided with a so-called Clupak unit or compacting unit for producing light or micro-creping, said unit comprising a hard roll and a soft roll developing therebetween a nip through which a paper web travels preferably at a dry matter content within the range of 50 - 70 %.
  • Clupak unit is to contribute to the quality characteristics of paper, especially flexibi- lity, tearing resistance and elongation.
  • Patent application FI-911987 discloses a papermaking machine for producing a web of soft creped paper. Also this publication shows the use of a press roll for pressing the web of paper against a yankee cylinder in view of obtaining certain cohesion and softness values.
  • a web of paper being advanced to a press roll is supported by means of a felt, the web of paper transferring onto such support from a former wire included in the wet end.
  • a particular object of this invention is to provide a method used in a dryer section as set forth in the preamble of the claim for effecting light creping.
  • a method of the invention is primarily characterized in that, in view of subjecting a web of paper to conditioning, especially to so-called micro- creping, at least one dryer cylinder is subjected to the following operations:
  • this particular dryer cylinder is provided with at least one pressing zone, through which a web of paper is advanced between a dryer felt and an elastic element, whereby the pressing zone is produced by accompanying the dryer cylinder with at least one pressing roll or a like.
  • a press zone wherein a pattern included in the dryer felt can be transferred onto a web of paper traveling through the press zone, whereby an elastic element, which within the press zone lies on the
  • the solution is capable of avoiding the scorching of a web of paper onto a dryer cylinder since within the press zone, wherein the web of paper could poosibly be subjected to a thermal load suffi-
  • said web of paper travels between a dryer felt and an elastic element and, thus, the web of paper is not in direct contact with the surface of a dryer cylinder as there is an elastic element between the cylinder and the web of paper.
  • the dryer felt is
  • the dryer felt is formed from a normal dryer felt used in a dryer section.
  • At least some of the dryer cylinders in the upper tier of dryer cylinders can be provided with a dryer felt which at a certain cylinder/cylinders, located both upstream and downstream of the press zone, serves as a normal dryer felt but which, within the press zone in applying the method, serves as an abutment felt or wire preferably against this particular dryer cylinder, thus providing an element facilitating the removal of a web of paper from the dryer cylinder in all conditions downstream of the press zone.
  • the pressing roll is adapted to be provided with an elastic ooating, e.g. a rubber coating, serving at least as a part of elastic element.
  • an elastic ooating e.g. a rubber coating
  • the elastic coating has a hardness index which is higher than that of the endless track.
  • the elastic element is made exclusively of an endless felt or a like, which is adapted to travel through said press zone, or the elastic element is made of an elastic coating applied to the pressing roll.
  • fig. l shows a general schematic view of a dryer section of a papermaking machine, displaying schematically the position of a press zone intended for carrying out a method of the invention
  • fig. 2 is a side view of a technical assembly required for producing a press zone
  • fig. 3 is a larger-scale view of a press zone.
  • the wet end M of a papermaking machine (a former section and a press section) is folowed by a dryer section l with a built-in zone II, which includes a press zone of the invention.
  • the dryer section may include a section upstream of press zone II, which is a so-called Clupak unit 2.
  • the dryer section 1 may structurally be like any dryer section known from papermaking technology (a front, intermediate and/or rear dryer) , e.g.
  • a so-called separate dryer felt run arrangement including on the one hand a first dryer felt configuration traveling around an upper tier of cylinders and, on the other hand, a second dryer felt configuration or a so-called single felt con ⁇ figuration traveling around a lower tier of cylinders.
  • a method of the invention refers to a so-called on- machine process.
  • a dryer felt 3 serving as a dryer felt for an upper tier of dryer cylinders 4, is advanced to one dryer cylinder 5a included in a lower tier of dryer cylinders 5, whereby a web of paper, designated with reference numeral 6, is likewise carried along with dryer felt 3 to said dryer cylinder 5a such that it lies on the outer surface of the dryer felt as said dryer felt 3 comes into contact with dryer cylinder 5a.
  • Adjacent to dryer cylinder 5a is located an endless elastic element 8, especially a felt assembly, which is separate from a dryer felt 7 of a lower tier of dryer cylinders and which in the vicinity of dryer cylinder 5a is applied against one surface of the web of paper.
  • a pressing roll 9 Adjacent to dryer cylinder 5a is further located a pressing roll 9, provided with an elastic coating 10, such as a rubber coating. Between dryer cylin- der 5a and pressing roll 9 develops a nip zone 11 for advancing web of paper 6 therethrough such that it lies between endless elastic element 8 placed against the coating of pressing roll 9, on the one hand, and dryer felt 6 placed against dryer cylinder 5a, on the other hand.
  • a thermal effect released from the dryer cylinder and, on the other hand, a compression effect developed in nip 11 is that the texture of a dryer felt transfers onto web of paper 6, whereby the web of paper conforms with the dryer felt texture upon pressing primarily against elastic element 8 and on the other hand against elastic coating 10 of pressing roll 9.
  • FIG. 2 illustrates a further stage of paper-web drying, whereby a dryer cylinder 5b downstream of the press zone in lower tier of dryer cylin ⁇ ders 5 operates as a normal dryer cylinder, said web of paper 6 being carried as an open draw to dryer cylinder 5b for pressing it against the outer surface of the dryer cylinder by means of dryer felt 7.
  • Fig. 3 illustrates in more detail the situation adjacent to press zone 5a, 9, 11.
  • a combina ⁇ tion of dryer felt 3, web of paper 6, and elastic element 8 arriving in press zone 5a, 10, 9 and 11 is essentially discrete but, as a result of pressing action applied by the press zone, said web of paper 6 conforms with a tex ⁇ ture 13 of dryer felt 3 and said elastic element 8 dis ⁇ engages from web of paper 6 and dryer felt 3, as shown at 12 in fig. 3.
  • a press-zone operation be effected such that the web of paper has a dry matter content of 50- 80 %, preferably 55-65 %.
  • the elastic element can alternatively be either just an elastic coating or an endless track, as self-evident for a skilled person the basis of the above specification.
  • the method can be carried out by using a so-called marking wire, the technical configuration of its run being within the normal abilities of a skilled person.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé pour traiter une bande continue de papier dans une section de séchage (1) d'une machine à papier, dans lequel la bande continue de papier est soumise à un séchage en l'amenant supportée par au moins un feutre de séchage (3) autour de cylindres sécheurs (4, 5) disposés en succession dans la section de séchage, suivant sa direction de mouvement du feutre de séchage. Le feutre de séchage est conçu pour presser la bande continue de papier contre un cylindre sécheur adjacent à celui-ci à n'importe quel emplacement suivant la direction de mouvement. Pour assurer le conditionnement de la bande continue de papier (6), au moins un cylindre sécheur (4, 5) est soumis aux opérations suivantes: A) ce cylindre sécheur particulier (4, 5) est pourvu d'une zone de pressage (5a, 9, 11), B) la bande continue de papier (6) est transportée à travers la zone de pressage (5a, 9, 11) entre le feutre de séchage (3) et un élément élastique (8, 10) et C) la zone de pressage (5a, 9, 11) est réalisée en prévoyant pour le cylindre sécheur un rouleau presseur (9) ou similaire.
PCT/FI1993/000206 1992-05-15 1993-05-14 Procede pour traiter une bande continue de papier dans la section de sechage d'une machine a papier WO1993023615A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI922223A FI89524C (fi) 1992-05-15 1992-05-15 Foerfarande foer behandling av en pappersbana i torkpartiet av en pappersmaskin
FI922223 1992-05-15

Publications (1)

Publication Number Publication Date
WO1993023615A1 true WO1993023615A1 (fr) 1993-11-25

Family

ID=8535298

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1993/000206 WO1993023615A1 (fr) 1992-05-15 1993-05-14 Procede pour traiter une bande continue de papier dans la section de sechage d'une machine a papier

Country Status (3)

Country Link
AU (1) AU4070993A (fr)
FI (1) FI89524C (fr)
WO (1) WO1993023615A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19507374A1 (de) * 1995-03-03 1996-09-19 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
EP0802279A2 (fr) * 1996-04-18 1997-10-22 Voith Sulzer Papiermaschinen GmbH Section de séchage
WO2001031121A1 (fr) * 1999-10-27 2001-05-03 Stora Kopparbergs Bergslags Aktiebolag (Publ) Procede et dispositif destines a la fabrication de papier ou de carton
EP1195464A2 (fr) * 1996-02-28 2002-04-10 Metso Paper, Inc. Section de séchage avec calandrage intermédiaire dans une machine à papier
US6860968B1 (en) 2000-05-24 2005-03-01 Kimberly-Clark Worldwide, Inc. Tissue impulse drying

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319352A (en) * 1964-04-29 1967-05-16 Albemarle Paper Mfg Company Apparatus and method for drying a fibrous web
GB2052586A (en) * 1979-05-19 1981-01-28 St Annes Board Mill Co Ltd Drying paper
EP0355873A1 (fr) * 1988-08-17 1990-02-28 Daniel Garcia Pastor Procédé de séchage mécanique pour la fabrication du papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319352A (en) * 1964-04-29 1967-05-16 Albemarle Paper Mfg Company Apparatus and method for drying a fibrous web
GB2052586A (en) * 1979-05-19 1981-01-28 St Annes Board Mill Co Ltd Drying paper
EP0355873A1 (fr) * 1988-08-17 1990-02-28 Daniel Garcia Pastor Procédé de séchage mécanique pour la fabrication du papier

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5666741A (en) * 1995-03-03 1997-09-16 Voith Sulzer Papiermaschinen Gmbh Drying section with additional press nip
DE19507374A1 (de) * 1995-03-03 1996-09-19 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19602697A1 (de) * 1995-12-22 1997-06-26 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19602697B4 (de) * 1995-12-22 2006-07-27 Voith Sulzer Papiermaschinen Gmbh Trockenpartie
EP1195464A2 (fr) * 1996-02-28 2002-04-10 Metso Paper, Inc. Section de séchage avec calandrage intermédiaire dans une machine à papier
EP1195464A3 (fr) * 1996-02-28 2002-07-10 Metso Paper, Inc. Section de séchage avec calandrage intermédiaire dans une machine à papier
EP0802279A2 (fr) * 1996-04-18 1997-10-22 Voith Sulzer Papiermaschinen GmbH Section de séchage
US6131304A (en) * 1996-04-18 2000-10-17 Voith Sulzer Papiermaschinen Gmbh Dryer section
US5956864A (en) * 1996-04-18 1999-09-28 Voith Sulzer Papiermaschinen Gmbh Dryer section with a pressing device
EP0802279A3 (fr) * 1996-04-18 1998-09-09 Voith Sulzer Papiermaschinen GmbH Section de séchage
DE19615226A1 (de) * 1996-04-18 1997-10-23 Voith Sulzer Papiermasch Gmbh Trockenpartie
WO2001031121A1 (fr) * 1999-10-27 2001-05-03 Stora Kopparbergs Bergslags Aktiebolag (Publ) Procede et dispositif destines a la fabrication de papier ou de carton
US6718654B1 (en) 1999-10-27 2004-04-13 Stora Kopparbergs Bergslags Aktiebolag (Publ) Device and method in connection with the manufacturing of paper or cardboard
US6860968B1 (en) 2000-05-24 2005-03-01 Kimberly-Clark Worldwide, Inc. Tissue impulse drying

Also Published As

Publication number Publication date
AU4070993A (en) 1993-12-13
FI89524C (fi) 1993-10-11
FI922223A0 (fi) 1992-05-15
FI89524B (fi) 1993-06-30

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