EP1266085A1 - Machine pour la fabrication d'une bande de papier ou de carton et section de presses dans cette machine - Google Patents

Machine pour la fabrication d'une bande de papier ou de carton et section de presses dans cette machine

Info

Publication number
EP1266085A1
EP1266085A1 EP01910273A EP01910273A EP1266085A1 EP 1266085 A1 EP1266085 A1 EP 1266085A1 EP 01910273 A EP01910273 A EP 01910273A EP 01910273 A EP01910273 A EP 01910273A EP 1266085 A1 EP1266085 A1 EP 1266085A1
Authority
EP
European Patent Office
Prior art keywords
press
roll
nip
transfer belt
calender
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.)
Withdrawn
Application number
EP01910273A
Other languages
German (de)
English (en)
Inventor
Per Anders Artur Leandersson
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.)
Valmet AB
Original Assignee
Metso Paper Karlstad 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
Priority claimed from SE0000823A external-priority patent/SE515998C2/sv
Application filed by Metso Paper Karlstad AB filed Critical Metso Paper Karlstad AB
Publication of EP1266085A1 publication Critical patent/EP1266085A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21F3/04—Arrangements thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers
    • 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0063—Devices for threading a web tail through a paper-making machine

Definitions

  • the present invention relates to a machine for manufacturing a continuous paper or cardboard web, comprising
  • a press section that includes at least a first press, a second press and a third press, which presses each have first and second press elements co-operating with each other to form a press nip, in which the first press element of the second press consists of a smooth press roll, with a smooth envelope surface, and in which the third press has a press felt, running in a loop around a roll and the second press element in the third press,
  • an impermeable transfer belt running in a loop around a plurality of guide rolls and in contact with said smooth press roll of the second press and in contact with said press felt of the third press to transfer the web from the second press to the third press.
  • the invention also relates to a press section in a machine for manufacturing a continuous paper or cardboard web, comprising at least a first press, a second press and a third press, which presses each have first and second press elements co-operating with each other to form a press nip, in which the first press element of the second press consists of a smooth press roll, with a smooth envelope surface, and in which the third press has a press felt, running in a loop around a roll and the second press element in the third press, and
  • top side refers to the side of the paper or cardboard web that is suitable for printing and requires a specific surface smoothness or gloss for each printing quality of the paper or cardboard.
  • a paper machine of the kind described by way of introduction is known through US-5, 647, 960, in which the transfer belt runs around a portion of the smooth roll to form an encompassing zone, the sector angle of which with respect to the smooth roll can be regulated by parallel displacement of a guide roll, around which the transfer belt runs, located upstream.
  • the web runs through said encompassing zone enclosed between the smooth roll and the transfer belt without the web being subjected to any external pressure.
  • the web is pressed in the last press nip with its top side facing the transfer belt.
  • the object of the present invention is to provide a paper or cardboard machine that enables the manufacture of paper or cardboard webs with improved surface smoothness that conducts to the attainment of a web with very high printing quality.
  • the paper or cardboard machine in accordance with the invention, as well as the press section, is characterized in that
  • the press section comprises a wet calender, arranged between the second press and the third press and including a first roll nip, formed by a first calender roll, arranged in the loop of the transfer belt, and a second calender roll, arranged outside the loop of the transfer belt, the transfer belt and the web running together through said first roll nip in the wet calender.
  • Figure 1 shows in outline schematically parts of a cardboard machine with a press section in accordance with a first embodiment.
  • Figure 2 shows schematically parts of a cardboard machine with a press section similar to the one in Figure 1, but with a forming section of a different design from the one included in the cardboard machine in accordance with Figure 1.
  • Figure 3 is a cross-section along the line III-III in Figure 2.
  • Figure 4 shows the press section in accordance with Figure 1 (or Figure 2) somewhat enlarged, illustrating an operating position before threading of the web.
  • Figure 5 shows the press section in accordance with Figure 4, illustrating an operating position after threading of the web.
  • Figure 6 shows a press section in accordance with a second embodiment .
  • Figures 1 and 2 show schematically parts of a cardboard machine for manufacturing a cardboard web 1 that consists of a first layer 2 and a second layer 3.
  • the first layer 2 forms the core of the finished two-layer cardboard web
  • the second layer 3 forms its surface layer.
  • a cardboard web consisting of three or more layers, one of which being said core and another being said surface layer, is manufactured.
  • the surface layer 3 forms the top side 42 of the web that is to be treated so that as high a surface smoothness as possible is achieved.
  • Each of the cardboard machines shown comprises a forming section 4, a press section 5 and a drying section 6.
  • the forming section 4 includes a first forming unit 7 for manufacturing the core 2 and a second forming unit 8 for manufacturing the surface layer 3.
  • the two forming units 7, 8 consist of a first fourdrinier former, located upstream, and a second fourdrinier former, located downstream, whilst in the embodiment in accordance with Figure 2, they consist of a first twin-wire former or gap former, located upstream, and a second twin-wire former or gap former, located downstream.
  • first twin-wire former or gap former located upstream
  • second twin-wire former or gap former located downstream
  • the first fourdrinier former 7, located upstream in accordance with Figure 1, is extended in the machine direction and has a fourdrinier wire 9, which runs in a loop around an upstream breast roll 10, a downstream suction couch 11, a wire-turning roll 12 and a plurality of other types of guide rolls 13, such as alignment and tension rolls. Between the breast roll 10 and the suction couch 11, the fourdrinier wire 9 has a plane and horizontal upper run 14, where the stock is dewatered and the layers and web are formed. Further, the first upstream fourdrinier former 7 includes a headbox 15, arranged near the breast roll 10 to emit a jet of stock onto the upper run 14 of the fourdrinier wire 9, and dewatering members 16 for dewatering the stock to form the core 2.
  • the second fourdrinier former 8 located downstream in accordance with Figure 1, has a fourdrinier wire 17, which runs in a loop around a breast roll 18, an upper guide roll 19 and two lower guide rolls 20, which lower guide rolls are arranged closely adjacent to the upper run 14 of the fourdrinier wire 9 of the first fourdrinier former 7 to couch the formed second layer together with the formed first layer.
  • the second fourdrinier former 8 includes a headbox 21, arranged near the breast roll 18 to emit a jet of stock onto the upper, plane run 22 of the fourdrinier wire 17, and dewatering members 23 for dewatering the stock to form the second layer.
  • the first twin-wire former 7, located upstream in accordance with Figure 2 has first and second forming wires 25, 26 that run together in a forming zone.
  • the first forming wire 25 runs in an upper loop around a plurality of guide rolls 27.
  • the second forming wire 26 runs in a lower loop around an upstream forming roll 28 and a downstream suction couch 29, a wire-turning roll 30 and a plurality of other guide rolls 31, including alignment and tension rolls.
  • the lower forming wire 26 is extended up to the press section so that the suction couch 29 is located downstream of the second twin-wire former 8.
  • dewatering means 32 are arranged within said forming zone.
  • a headbox 33 is arranged to emit a jet of stock into a gap formed by the forming roll 28 and a guide roll 27 located adjacent to the same in the upper wire loop 25.
  • the second twin-wire former 8 located downstream in accordance with Figure 2, has first and second forming wires 34, 35 that run together in a forming zone.
  • the first forming wire 34 runs in a loop around a plurality of guide rolls 36 and has a lower, straight run 37, running along the lower forming wire 26 of the first twin-wire former 7 to form a couching zone .
  • the second forming wire 35 runs in a loop around a forming roll 38 and two guide rolls 39.
  • dewatering means 40 are arranged within said forming zone.
  • a headbox 41 is arranged to emit a jet of stock into a gap formed by the forming roll 38 and a guide roll 36 located adjacent to the same in the first wire loop 34.
  • the first, upstream forming unit 7 is arranged to provide a core 2, whilst the second, downstream forming unit 8 is arranged to provide a top layer or surface layer 3, which forms the top side 42 of the finished cardboard web suitable for printing, which surface layer 3 encounters the core 2 so that the two layers are couched together with each other to a unitary two-layer cardboard web, see Figure 3, which leaves the forming wire 9, 26 of the first forming unit 7 with the surface layer 3 facing upwards .
  • Each press section 5 includes a first press unit 50, including two press nips, and a second press unit 51, including one press nip.
  • the first press unit 50 includes a first, double-felted press 52, having an upper press element 53 and a lower press element 54, which press elements 53, 54 co-operate with each other to form a press nip between them.
  • the first press 52 is a roll press, in which, thus, the upper and lower press elements 53, 54 are press rolls.
  • the upper press roll 53 which, in the embodiments shown, is a suction roll, can be grooved and/or blind-drilled, whilst the lower press roll 54 can be smooth, grooved or blind-drilled.
  • the first press 52 is a shoe press, in which the lower press element 54 is a shoe roll.
  • the first press 52, the roll press includes an upper, endless press felt 55, running in a loop through the first press nip, around a plurality of guide rolls 56 and around a pick-up suction roll 57, arranged adjacent to the fourdrinier wire 9 to form a transfer zone with the same in which the formed web is transferred from the fourdrinier wire 9 to the upper press felt 55.
  • the roller press 52 has a lower endless press felt 58, running in a loop through the first press nip around a plurality of guide rolls 59.
  • the first press unit 50 includes a second press 60, having an upper press element 61 and a lower press element 62, which press elements 61, 62 co-operate with each other to form a second press nip between them.
  • the second press 60 is a roll press, in which, thus, the two, upper and lower press elements 61, 62 are press rolls.
  • the lower press roll 62 which in the embodiments shown is a suction roll, can be grooved and/or blind-drilled.
  • the upper press roll 53 of the first press 52 also forms the lower press roll 62 of the second press 60, i.e. the two presses 52, 60 have a common press element.
  • the upper press felt 55 of the first press 52 also runs through the second press nip.
  • the upper press roll 61 of the second press 60 is smooth, so that the web will accompany this smooth press roll 61, which has a smooth envelope surface, after the second press nip and not the upper press felt 55.
  • the press roll 62 is not a suction roll, as the two presses 52, 60 are separated, i.e. they have no common press roll.
  • the second press unit 51 includes a press 63, which has an upper press element 64 and a lower press element 65, which press elements 64, 65 co-operate with each other to form a press nip between them.
  • the last-mentioned press 63 is a shoe press, its upper press element 64 being a counter roll and its lower press element 65 being a shoe roll .
  • the counter roll 64 always has a smooth envelope surface, whereas in the embodiment in accordance with Figure 6, the counter roll 64 can have a smooth or grooved envelope surface, a grooved envelope surface providing an improved air-handling function.
  • the shoe press 63 includes a lower endless press felt 66, running in a loop through the press nip, which thus is an extended press nip, around a plurality of guide rolls 67 and a pick-up suction roll 68, arranged upstream of the extended press nip and a distance from the upper smooth press roll 61 of the second press 60.
  • a transfer belt 69 is arranged to transfer the web from the upper smooth press roll 61 of the second press 60 to the lower press felt 66 of the shoe press 63.
  • the transfer belt 69 runs in an endless loop around a plurality of guide rolls 70, one of which is arranged downstream of the pick-up suction roll 68 to co-operate with the lower press felt 66 in a transfer zone.
  • the press section is provided also with a wet calender, arranged between the second press 60 and the third press 63 and including a first roll nip, formed by a first calender roll 79, arranged in the loop of the transfer belt 69, and a second calender roll 80, arranged outside the loop of the transfer belt 69.
  • the transfer belt 69 and the web 1 thus run together through the first roll nip in the wet calender.
  • the first roll nip is arranged in close proximity to the upper smooth press roll 61 of the second press 60 so that this press roll 61 forms the second calender roll 80, whilst the first calender roll 79 is arranged in the loop of the transfer belt 69 opposite said smooth press roll 61.
  • the first calender roll 79 is pivotably mounted to assume an elevated inactive position in accordance with Figure 4 and a lowered active position in accordance with Figure 5.
  • the transfer belt 69 runs into the roll nip of the wet calender, while encompassing a portion of the first calender roll 79 and thus does not encounter the web until said roll nip.
  • the transfer belt 69 is arranged such that it departs from the smooth second calender roll 80 with the web adhering to it immediately after the exit from the roll nip of the wet calender. Accordingly, the transfer belt 69 is in contact with the smooth second calender roll 80 only in the roll nip.
  • the nip pressure in the roll nip of the calender is at least 30 kN per metre of web width.
  • a doctor 72 is arranged for scraping the web 1 from the smooth press roll 61 to divert the web down to a broke section.
  • the counter roll 64 is provided with a doctor 73, arranged to loosen the leader from the smooth surface of the counter roll 64 in connection with threading, a blowing device (not shown) being arranged to guide the leader in the direction of the drying section 6.
  • Reference number 82 denotes a guide roll that is arranged between the press section and the drying section to support the web when this runs therebetween, the top side 42 of the web facing away from this guide roll.
  • the first roll nip of the wet calender is formed by a separate pair of calender rolls arranged in a suitable location downstream of the smooth upper press roll 61.
  • the wet calender has a second roll nip, in which case the first roll nip can correspond to what is shown on the drawings and the second roll nip is formed by a pair of calender rolls arranged in a suitable location downstream of the first roll nip, the transfer belt running through both the roll nips of the wet calender together with the web.
  • the drying section 6 includes a plurality of drying cylinders 74 and a drying clothing 75, running in a loop around the drying cylinders 74 and a plurality of guide rolls 76, of which the guide roll located nearest the press section 5 is arranged such that the drying clothing 75 is deflected in the direction towards the first drying cylinder 74.
  • a blowing box 83 generating a partial vacuum to retain the web against the drying clothing 75 is mounted before the first drying cylinder 74 in the loop of the drying clothing.
  • the web is widened to full width and the calender roll 79 is swivelled down to its operational position adjacent to the smooth press roll 61 to form the wet calender roll nip, as illustrated in Figure 5.
  • the press section in accordance with Figure 6 is similar to the one in accordance with Figure 5, but with the difference that the transfer belt 69 is extended so that it runs through the shoe press nip and around a guide roll 70 located downstream of the shoe press nip so that the transfer belt 69 also supports the web after the shoe press nip.
  • the roll 68 located upstream in the loop of the press felt 66, does not need to have suction function. From this roll 68, the web runs enclosed between the press felt 66 and the transfer belt 69.
  • the press section is combined with the drying section by way of a permeable transfer clothing 77, running in a loop around a plurality of guide rolls 78, one of which being a pick-up suction roll, enabling the web to be transferred to the permeable transfer clothing 77.
  • the first guide roll 76 of the drying section is designed as a pick-up suction roll that co-operates with the transfer clothing 77 to transfer the web to the drying clothing 75.
  • the press sections described in accordance with the invention cause the web to be pressed in the two last press nips with the top side in direct contact with a smooth surface in each press nip, namely first in the additional press nip in the shape of the wet calender roll nip and then in the press nip of the third press, the embodiment in accordance with Figure 5 providing a somewhat finer top side, by comparison with the embodiment in accordance with Figure 6 , as the top side of the web in the last press nip is in contact with a counter roll 64 the envelope surface of which being somewhat smoother than the web-contacting surface of the transfer belt 69.
  • the invention contributes to the attainment of webs with top sides having an extremely high smoothness.
  • press sections shown eliminate an open draw before the last press.
  • an open draw is also eliminated after the last press.
  • Examples of cardboards with high requirements regarding printing quality are the ones commercially known as "White Top Liner” and "Phote Base paper".

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une machine servant à fabriquer une bande de papier ou de carton (1) et comprenant une section de presses (5) munie d'une première, d'une deuxième et d'une troisième presse (52, 60, 63) pourvues de premiers et de deuxièmes éléments de presse (53, 54 ; 61, 62 ; 64, 65). Le premier élément de presse de la deuxième presse est un rouleau de presse lisse ayant une surface d'enveloppe lisse et la troisième presse comporte un feutre de presse (66) passant autour d'un rouleau (68) et du deuxième élément de presse dans la troisième presse, une courroie de transfert imperméable (69) tournant en contact avec le rouleau de presse de la deuxième presse et le feutre de presse de la troisième presse pour transférer la bande de la deuxième presse à la troisième presse. Selon l'invention, la section de presses comprend une calandre humide, située entre la deuxième presse et la troisième presse et présentant un premier contact de rouleau formé par une premier rouleau de calandre (79) placé dans la boucle de la courroie de transfert et par un deuxième rouleau de calandre (80) placé à l'extérieur de la courroie de transfert (69). L'invention concerne également une section de presses de ce type.
EP01910273A 2000-03-14 2001-02-15 Machine pour la fabrication d'une bande de papier ou de carton et section de presses dans cette machine Withdrawn EP1266085A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE0000823 2000-03-14
SE0000823A SE515998C2 (sv) 2000-03-14 2000-03-14 Maskin för framställning av en pappers- eller kartongbana och pressparti däri
US19663400P 2000-04-12 2000-04-12
US196634P 2000-04-12
PCT/SE2001/000317 WO2001068977A1 (fr) 2000-03-14 2001-02-15 Machine pour la fabrication d'une bande de papier ou de carton et section de presses dans cette machine

Publications (1)

Publication Number Publication Date
EP1266085A1 true EP1266085A1 (fr) 2002-12-18

Family

ID=26655018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01910273A Withdrawn EP1266085A1 (fr) 2000-03-14 2001-02-15 Machine pour la fabrication d'une bande de papier ou de carton et section de presses dans cette machine

Country Status (4)

Country Link
US (1) US20030062141A1 (fr)
EP (1) EP1266085A1 (fr)
AU (1) AU2001237847A1 (fr)
WO (1) WO2001068977A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011005747A1 (de) * 2011-03-18 2012-09-20 Voith Patent Gmbh Blattbindungsvorrichtung
WO2015185295A1 (fr) * 2014-06-06 2015-12-10 Voith Patent Gmbh Moyen de production d'une bande de matière fibreuse

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4556451A (en) * 1980-12-18 1985-12-03 Beloit Corporation Method of and apparatus for substantially equal compacting and dewatering of both faces of freshly felted paper web
DE4042480C2 (de) * 1990-08-17 2000-02-10 Voith Gmbh J M Pressenpartie einer Papiermaschine
DE4335024C2 (de) * 1993-10-14 1999-09-16 Voith Gmbh J M Pressenpartie einer Papiermaschine und Überführeinrichtung
DE4340041A1 (de) * 1993-11-24 1994-04-07 Voith Gmbh J M Pressenpartie für eine Papiermaschine
US5868904A (en) * 1993-12-08 1999-02-09 Valmet Corporation Press section employing an extended nip press with suction counter roll
US6294052B1 (en) * 1997-06-18 2001-09-25 Jose J. Garcia B. Efficient press section for paper manufacturing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0168977A1 *

Also Published As

Publication number Publication date
WO2001068977A1 (fr) 2001-09-20
AU2001237847A1 (en) 2001-09-24
US20030062141A1 (en) 2003-04-03

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