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EP1546453B1 - Procede de fabrication de carton et machine de fabrication de carton - Google Patents

Procede de fabrication de carton et machine de fabrication de carton Download PDF

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Publication number
EP1546453B1
EP1546453B1 EP03794380A EP03794380A EP1546453B1 EP 1546453 B1 EP1546453 B1 EP 1546453B1 EP 03794380 A EP03794380 A EP 03794380A EP 03794380 A EP03794380 A EP 03794380A EP 1546453 B1 EP1546453 B1 EP 1546453B1
Authority
EP
European Patent Office
Prior art keywords
press
web
nip
roll
section
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
EP03794380A
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German (de)
English (en)
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EP1546453A1 (fr
Inventor
Anders 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 Technologies Oy
Original Assignee
Metso Paper 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
Priority claimed from SE0202660A external-priority patent/SE523867C2/sv
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1546453A1 publication Critical patent/EP1546453A1/fr
Application granted granted Critical
Publication of EP1546453B1 publication Critical patent/EP1546453B1/fr
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
    • 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
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • the present invention relates to a method of making paperboard.
  • the invention also relates to a machine for making paperboard as well as to a press section in which a wet fibrous web may be dewatered.
  • the present invention relates to the production of paperboard.
  • paperboard grades include Solid Bleached Board, Liquid Packaging Board, Gypsum Board and White Lined Chipboard.
  • Solid Bleached Board - or SBB - is a grade that has a basis weight in the range of 160 g/m 2 - 400 g/m 2 and is made of 100% chemical pulp. This grade usually comprises more than one layer and is therefore made in a machine having more than one forming unit. However, SBB can also be made with only one layer. SBB is primarily used for making cigarette packets but can also used for other packaging purposes.
  • Liquid Packaging Board - or LPB - is a grade that has a basis weight in the range of 160 g/m 2 - 400 g/m 2 . This grade comprises several layers. Usually, LPB is made of both chemical and mechanical pulp.
  • Gypsum Board is a grade that has a basis weight in the range of 140 g/m 2 - 300 g/m 2 . Gypsum Board typically comprises several layers and is normally made from recycled fibers.
  • White Lined Chipboard is a board grade that has a basis weight in the range of 160 g/m 2 - 450 g/m 2 .
  • White Lined Chipboard is extensively used in the manufacture of cartons for all manner of articles.
  • WLC has several layers of which a top layer is bleached and forms a white side that goes on the outside of the carton and carries the printing.
  • the various gray layers are made from recycled fibers.
  • the press section does not require too much space and that the press section is easy to operate. Furthermore, it is desirable that web breaks can be taken care of efficiently and that web breaks in the press section do not cause harm to the machinery.
  • a suction roll can be used as a counter roll for a shoe press roll.
  • Such a concept is disclosed in WO 99/60203 and it is stated that this concept can be used for a paper or board machine.
  • US patent No. 4,662,992 discloses a twin-wire papermaking machine having a wire section with a top wire and a bottom wire.
  • a press nip is formed between a single pressing roll 14 a pressing or supporting shoe 17 with a flexible band 20.
  • the single pressing roll 14 is a non-suction solid roll.
  • the single pressing roll 14 and the pressing shoe form a single pressing nip in the form of an extended pressing zone.
  • the single pressing nip is a two-felted nip.
  • one felt 34 forms a loop around the pressing roll 14 and another felt 19 forms a loop around the pressing shoe 17 and the flexible band 20.
  • the felt 34 that forms a loop around the single pressing roll 14 is guided conjointly with the paper web from the top wire to the single pressing roll 14.
  • a drying section is located after the press section. In the Figure illustrating the embodiment with a two-felted nip, the web is shown as following a partially unsupported open draw to the drying section.
  • An additional object of the invention is to provide a machine and a press section that is easy to operate and where web breaks can be taken care of efficiently. It is also an object to provide a press section that requires a minimum of space.
  • a fibrous web is formed on a foraminous wire.
  • the web has a basis weight in the range of 140 g/m 2 - 500 g/m 2 .
  • the fibrous web is transferred from the wire to a first press felt in a press section.
  • the first felt is an upper felt and the press section comprises a single dewatering nip formed between an upper shoe press roll and a lower suction roll.
  • the first press felt forms a loop around the shoe press roll and a second press felt which is a lower felt forms a loop around the suction roll.
  • the shoe press roll may be, for example, a SymBelt TM shoe press roll that can be obtained from Metso Paper Karlstad AB, Sweden.
  • the fibrous web is passed through the single dewatering nip.
  • the web has been sucked against the second press felt by the suction roll.
  • the fibrous web exits from the single dewatering nip, the web is separated from the lower press felt and passed in an at least partially open draw to a drying section located downstream of the press section.
  • the press section further comprises a smoothing press located between the single dewatering nip and the drying section.
  • the rolls of the smoothing press can be operated at a higher peripheral speed than the peripheral speed of the rolls of the single dewatering nip. Thereby, the fibrous web can be pulled away from the lower press felt as the web exits from the single dewatering nip.
  • the fibrous web is formed in a forming section having at least two forming units so that the fibrous web is formed as a web with at least two layers.
  • the web can have a basis weight in the range of 160 g/m 2 - 400 g/m 2 and the web can be formed either from a purely chemical pulp or at least partially from mechanical pulp.
  • the web is passed through a dewatering nip on the foraminous wire before it is transferred from the wire to the press section. This is suitable in particular if the web is formed from mechanical pulp.
  • the single dewatering nip applies a linear load on the web that is not higher than 200 kN/m.
  • the web is formed at least partially from mechanical pulp, it may be suitable to apply linear loads higher than 200 kN/m in the single dewatering nip.
  • the speed of the web should preferably not exceed 1000 m/min in the press section.
  • the linear load can suitably be in the range of 20 kN/m - 100 kN/m.
  • the invention also relates to a press section for pressing water from a wet fibrous web.
  • the press section according to the present invention comprises a shoe press roll and a suction roll.
  • the suction roll forms a dewatering nip against the shoe press roll.
  • This dewatering nip is the only or single dewatering nip of the press section such that there is no other dewatering nip in the press section.
  • a first press felt forms a loop around the shoe press roll and a second press felt forms a loop around the suction roll such that the fibrous web can be passed through the dewatering nip sandwiched between the first and the second press felt.
  • the second press felt has a felt run after the single dewatering nip that diverges from the felt run of the first press felt.
  • the shoe press roll is an upper roll in the dewatering nip and the suction roll is a lower roll.
  • the press section is provided with means for separating the fibrous web from the second press felt as the web exits from the single dewatering nip.
  • a smoothing press nip Downstream of the dewatering nip, a smoothing press nip is formed by a pair of smoothing rolls arranged to come into direct contact with the surface of the fibrous web such that each side of a fibrous web passing through the smoothing press nip will be contacted by one of the smoothing rolls.
  • the smoothing rolls can be driven at a peripheral speed that exceeds the peripheral speed of the shoe press roll and the suction roll.
  • a guide roll for the fibrous web may placed so that a straight line from the dewatering nip to the point of contact between the guide roll and the web diverges from the felt run of the second press felt after the single dewatering nip.
  • the smoothing press nip may be placed so that a straight line from the dewatering nip to the smoothing press nip diverges from the felt run of the second press felt after the single dewatering nip.
  • the pair of smoothing rolls preferably comprises one roll with a relatively hard cover having a hardness in the range of 0 - 1 P&J and one roll with a relatively soft cover having a hardness in the range of 10 - 40 P&J.
  • the invention also relates to a machine for making paperboard such as for example Solid Bleached Board or Liquid Packaging Board.
  • the machine comprises a forming section having at least one foraminous wire on which a fibrous web may be formed.
  • the machine further comprises a press section downstream of the forming section.
  • the press section has a single dewatering press nip.
  • In the press section there is a shoe press roll and a suction roll that, together with the shoe press roll, forms the single dewatering nip of the press section.
  • a first press felt forms a loop around the shoe press roll and the first press felt is arranged to pick up the fibrous web from the foraminous wire of the forming section.
  • a second press felt forms a loop around the suction roll such that the fibrous web can be passed through the dewatering nip sandwiched between the first and the second press felt.
  • the second press felt has a felt run after the single dewatering nip that diverges from the felt run of the first press felt.
  • a drying section is located downstream of the press section and separated from the single dewatering press nip by a web run which is separate from the run of the second press felt downstream of the single dewatering nip.
  • a smoothing press nip is located between the press section and the drying section.
  • the smoothing press nip is formed between a pair of smoothing rolls arranged to come into direct contact with the surface of the fibrous web such that each side of a fibrous web passing through the smoothing press nip will be contacted by one of the smoothing rolls.
  • the smoothing rolls can be driven at a peripheral speed that exceeds the peripheral speed of the press rolls.
  • a guide roll can be placed between the dewatering press nip and the smoothing press nip. The guide roll is preferably placed so that a straight line from the dewatering nip to the guide roll diverges from the felt run of the second press felt after the single dewatering nip.
  • the forming section comprises at least two forming units such that the fibrous web is formed as a web with at least two layers.
  • the smoothing press comprises one roll with a relatively soft cover and one roll with a relatively hard cover.
  • the machine may further comprise a dewatering press nip in the forming section.
  • a fibrous web W having a basis weight in the range of 140 g/m 2 - 500 g/m 2 is initially formed on the foraminous wire 5 of a forming section 2.
  • the forming section 2 may have more than one forming unit.
  • two forming units 3, 4 are shown.
  • the fibrous web W can be formed as a web W with at least two layers.
  • the fibrous web W is transferred from the wire 5 to a first press felt 7 in a press section 6.
  • the wet fibrous web W may have a dry solids content of about 15% by weight - 20% by weight.
  • the first press felt 7 is suitably an upper press felt.
  • the press section 6 comprises a single dewatering nip 9 formed between an upper shoe press roll 10 and a lower suction roll 11.
  • the suction roll 11 can suitably be operated at a negative pressure of about 35 kPa.
  • An example of a suction roll that could possibly be suitable for this purpose is disclosed in WO 98/0793 included herein by reference.
  • the first press felt 7 forms a loop around the shoe press roll 10.
  • the fibrous web W is passed through the single dewatering nip 9.
  • the suction roll 11 is able to handle large quantities of water. This is very important for webs with a high basis weight such as paperboard grades that are heavy and contain large amounts of water as they enter the press section.
  • the fibrous web W is sucked against the second press felt 8 by the suction roll 11. Therefore, the web W will adhere to the second press felt 8. Unless the web is prevented from doing so, the web W will follow the second press felt 8 after the dewatering nip 9.
  • the dry solids content of the web may be about 40% - 45%.
  • the dryness should preferably be as high as possible when the web W reaches the drying section 13 since water that has not been pressed out in the press section must be removed by heat, which is expensive. It costs less to press out water than to evaporate water from the web.
  • the web W can be separated from the second press felt 8 in for example the following way.
  • the press section 6 preferably comprises a smoothing press nip 14 formed between a pair of smoothing rolls 15, 16.
  • the smoothing press nip 14 is suitably located between the single dewatering nip 9 and the drying section 13.
  • the smoothing rolls 15, 16 can be operated at a higher peripheral speed than the peripheral speed of the rolls in the single dewatering nip 9 such that the smoothing rolls 15, 16 will exert a force on the web W. Thereby, the fibrous web W will be separated from the lower press felt 8 as the web W exits from the single dewatering nip 9.
  • the speed of the web W in the press section does not exceed 1000 m/min and the difference in peripheral speed between the rolls in the single dewatering nip 9 and the smoothing rolls 15, 16 may be in the range of 0,5 % - 2 %. It should be understood that many machines for paperboard are operated at speeds well below 1000 m/min. A normal machine speed may be in the range of 500 m/min - 800 m/min. Since an open draw is used in the method according to the present invention, speeds above 1000 m/min would probably be difficult to achieve. Since the fibrous web W is pulled away from the second press felt 8 as soon as the web exits from the dewatering nip 9, rewetting can be avoided. Therefore, a high dryness can be achieved. Possibly, a guide roll 60 placed between the single dewatering nip 9 and the smoothing press nip 14 can also be used to guide the web W away from the second press felt 8.
  • An alternative method for separating the web W from the second press felt 8 could be to apply a speed difference between the drying section 13 and the press section 6.
  • the web W is preferably formed to have a basis weight in the range of 160 g/m 2 - 400 g/m 2 and the web W can be formed either from chemical pulp or at least partially from mechanical pulp.
  • the linear load on the web in the single dewatering nip should preferably not exceed 200 kN/m since a higher load could be detrimental to bulk.
  • the web W is formed wholly or partially from mechanical pulp, it may even be desirable to use a higher linear load than 200 kN/m since webs formed from mechanical pulp require a higher linear load and higher pressures in order to achieve adequate dewatering.
  • a high linear load in the dewatering nip may be required, i.e. a linear load exceeding 200 kN/m.
  • the web is formed from mechanical pulp, it can also be advantageous to pass the web W through a dewatering nip 17 on the foraminous wire 5 before it is transferred from the wire 5 to the press section 6.
  • the linear load in the smoothing press is preferably in the range of 20 kN/m - 100 kN/m.
  • the web When the web W has been passed through the drying section, the web may be subjected to other operations such as coating and calendering.
  • a calendering operation may be performed for example by means of an extended nip calender such as an OptiDwell TM shoe calender that is sold by Metso Paper Inc., Järvenpää, Finland.
  • an extended nip calender such as an OptiDwell TM shoe calender that is sold by Metso Paper Inc., Järvenpää, Finland.
  • the web is a web with more than one layer and one of the layers is a bleached layer intended for printing, the bleached layer can be coated.
  • the web W After coating, the web W can be subjected to calendering, e.g. calendering with a shoe calender.
  • the invention also relates to a press section 6 for pressing water from a wet fibrous web W.
  • the press section comprises a shoe press roll 10 and a suction roll 11.
  • the shoe press roll 10 has a concave shoe 90.
  • the suction roll 11 forms a dewatering nip 9 against the shoe press roll 10.
  • This dewatering nip is the single dewatering nip 9 of the press section 6 such that there is no other dewatering nip in the press section 6.
  • the shoe press roll 10 is an upper roll in the single dewatering nip 9 and the suction 11 roll a lower roll.
  • a first press felt 7 forms a loop around the shoe press roll and a second press felt 8 forms a loop around the suction roll 11 such that the fibrous web W can be passed through the single dewatering nip 9 sandwiched between the first 7 and the second press felt 8.
  • the second press felt 8 has a felt run after the single dewatering nip 9 that diverges from the felt run of the first press felt 7.
  • a suction roll 40 is arranged to pick up the wet fibrous web W from a foraminous wire 5 of a forming section.
  • Means are provided for separating the fibrous web W from the second press felt 8 as the web exits from the single dewatering nip 9.
  • a smoothing press nip 14 is formed by a pair of smoothing rolls 15,16.
  • the smoothing rolls 15, 16 are arranged to come into direct contact with the surface of the fibrous web such that each side of a fibrous web passing through the nip of the smoothing press nip 14 will be contacted by one of the smoothing rolls 15,16.
  • a guide roll 60 is provided for guiding the web W along a path that diverges from the felt run of the second press felt 8. In for example Fig. 3, a guide roll 60 is showed. A straight line from the single dewatering nip 9 to the guide roll 60 (or to the web-contacting part of the guide roll) diverges from the felt run of the second press felt 8 after the dewatering nip 9.
  • the smoothing press nip 14 may be placed so that a straight line from the dewatering nip 9 to the smoothing press nip 14 diverges from the felt run of the second press felt after the single dewatering nip 9.
  • the smoothing rolls 15,16 can be driven at a peripheral speed that exceeds the peripheral speed of the press rolls 10, 11 of the dewatering nip 9.
  • the peripheral speed of the smoothing rolls exceed the peripheral speed of the press rolls (the suction roll and the shoe press roll)
  • the fibrous web will be pulled away from the second press felt 8 so that the web run diverges from the web run of the second press felt after the dewatering nip 9 and rewetting can be reduced.
  • the first press felt 7 may be used to stabilize the fibrous web W during a part of the web run but the web does not adhere to the first press felt 7.
  • Fig. 2 it can be seen how the fibrous web W has a web run after the single dewatering nip 9 that is very close to the first press felt 7.
  • the first press felt 7 can contribute to stabilizing the web W during part of the web run but the web W does not adhere and there is either no or only insignificant rewetting from the first press felt 7.
  • the pair of smoothing rolls comprises one roll with a relatively hard cover having a hardness in the range of 0 - 1 P&J and one roll with a relatively soft cover having a hardness in the range of 10 - 40 P&J.
  • the shoe press roll is preferably an upper roll. Therefore, the shoe press roll is advantageously equipped with means for retracting the shoe.
  • Such means are disclosed in, for example, US patent No. 5662777 , US patent No. 5223100 , US patent No. 5084137 and US patent No. 6083352 .
  • the shoe press roll that forms part of the present invention could suitably be designed according to the disclosure of one of the above indicated US patents (of course, other designs may also be possible).
  • the applicant reserves the right to further define the invention in terms taken from any one of the above indicated US patents.
  • a suitable shoe length for the concave shoe of the shoe press roll is in the range of 200 mm - 400 mm. Preferably, the shoe length is about 290 mm.
  • the press felts should preferably have a high degree of water permeability.
  • a smooth-surfaced roll 51 is arranged to pick the web W from the second press felt 8 .
  • a doctor 50 is arranged to act on the smooth roll 51.
  • Fig. 3 an alternative embodiment is disclosed that may be suitable for grades formed from mechanical pulp.
  • a dewatering nip 17 in the forming section.
  • This nip is formed between a roll 31 and a suction roll 32.
  • the suction roll 32 is placed inside the loop of the foraminous wire 5 and the roll 31 is looped by a fabric 30 that may be a felt.
  • This kind of press nip (a nip on the foraminous wire) is often referred to as a pre-press nip.
  • Fig. 4 shows an embodiment that is similar to the embodiment of Fig. 3 except that the dewatering nip 17 in the forming section is formed between a shoe press roll 31 and a suction roll 32 inside the loop of the foraminous wire 5.
  • Fig. 5 shows an embodiment that is similar to the embodiment of Fig. 3 except that the first press felt 7 extends through the dewatering nip 17 in the forming section.
  • the pre-press has no separate fabric 30.
  • Fig. 6 shows an embodiment that is similar to the embodiment of Fig. 5 except that a shoe press roll 31 is used for the dewatering nip 17 on the foraminous wire (the pre-press).
  • Fig. 7 shows an embodiment that is similar to the embodiment of Fig. 3 except that the pre-press employs a solid roll 32 instead of the suction roll 32 indicated in Fig. 3.
  • the invention also relates to a machine for making paperboard.
  • the machine comprises a forming section 2 having at least one foraminous wire 5 on which a fibrous web W may be formed.
  • a press section 6 Downstream of the forming section 2, there is a press section 6 having a single dewatering press nip 9.
  • the single dewatering nip 9 is formed between a shoe press roll 10 and a suction roll 11 which, together with the shoe press roll 10, forms the single dewatering nip 9 of the press section 6.
  • a first press felt 7 forms a loop around the shoe press roll 10 and the first press felt 7 is arranged to pick up the fibrous web W from the foraminous wire 5 of the forming section 2.
  • a suction pick-up roll 40 is arranged within the loop of the first press felt 7 in order to pick up the fibrous web W from the wire 5.
  • a second press felt 8 forms a loop around the suction roll 11 such that the fibrous web W can be passed through the single dewatering nip 9 sandwiched between the first 7 and the second press felt 8.
  • the second press felt 8 has a felt run after the single dewatering nip 9 that diverges from the felt run of the first press felt 7.
  • a drying section 13 is located downstream of the press section 6. In Fig. 1, only two drying cylinders 20, 21 are indicated but it should be understood that the drying section 13 normally comprises a large number of drying cylinders and not just two drying cylinders.
  • the drying cylinders 20, 21, can be heated from the inside so that water can be evaporated from the fibrous web W.
  • the drying section 13 is separated from the single dewatering press 9 nip by a web run which is separate from the run of the second press felt 8 downstream of the single dewatering nip 9.
  • a smoothing press nip 14 is located between the press section 6 and the drying section 13.
  • the smoothing press nip 14 is formed by a pair of smoothing rolls 15, 16 arranged to come into direct contact with the surface of the fibrous web W such that each side of a fibrous web W passing through the smoothing press nip will be contacted by one of the smoothing rolls 15, 16.
  • Means are provided for separating the fibrous web W from the second press felt 8 after the single dewatering nip 9.
  • a guide roll 60 is showed. This guide roll 60 is located between the single dewatering nip 9 and the smoothing press nip 14.
  • the guide roll 60 will then contribute to separating the fibrous web from the second press felt 8.
  • the smoothing press nip 14 itself may be placed so that a straight line from the single dewatering nip 9 to the smoothing press nip 14 diverges from the felt run of the second press felt 8 after the single dewatering nip 9.
  • An additional guide roll 70 is located between the smoothing press nip 14 and the drying section 13.
  • the forming section 2 comprises two forming units 3, 4 such that the fibrous web W is formed as a web W with two layers.
  • the forming section 2 could also comprise more than two forming units.
  • the forming section 2 could comprise three or four forming units so that the fibrous web W could be formed as a web with three or four layers.
  • One of the rolls that form the smoothing press nip 14 is a roll with a relatively hard cover and one is a roll with a relatively soft cover.
  • the hard cover has a hardness in the range of 0 - 1 P&J and the soft cover a hardness in the range of 10 - 40 P&J.
  • the machine may also comprise a dewatering press nip 17 in the forming section 2.
  • the machine may suitably also include a coating unit after the drying section and a calender, for example a shoe calender such as an OptiDwell TM shoe calender.
  • a coating unit after the drying section and a calender, for example a shoe calender such as an OptiDwell TM shoe calender.
  • the press section can be made shorter so that it occupies less space. This is important for example during rebuilds of existing press sections where space may be limited. Moreover, less equipment in the press section makes the press section easier to operate.
  • An additional advantage of using a single dewatering press nip is that, for comparable dryness levels, higher bulk and bending stiffness can be obtained compared to what is possible in a press section with two or more dewatering press nips.
  • a possible threading sequence may be as follows. Initially, the entire web width is taken through the single dewatering nip.
  • Tail threading may also be achieved by such a tail threading device that is disclosed in US patent No. 6,131,784 .
  • the use of a shoe press also contributes to the achievement of a high dryness.

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Claims (13)

  1. Procédé de fabrication de carton, le procédé comprenant les étapes consistant à :
    a) former une bande fibreuse (W) sur une toile sans fin (5),
    b) transférer la bande fibreuse (W) de la toile sans fin (5) vers un feutre de presse supérieur (7) d'une section de presses (6), la section de presses (6) comprenant une ligne de contact essoreuse (9) formée entre un rouleau de presse supérieur à patin (10) et un rouleau aspirant inférieur (11), le feutre de presse supérieur (7) formant une boucle autour du rouleau de presse supérieur à patin (10), et un feutre de presse inférieur (8) formant une boucle autour du rouleau aspirant (11),
    c) faire passer la bande fibreuse (W) à travers la ligne de contact essoreuse (9), et
    d) faire passer la bande fibreuse dans une section de séchage (13) située en aval de la section de presses,
    caractérisé en ce que la bande fibreuse (W) est séparée du feutre de presse inférieur (8) lorsque la bande (W) sort de la ligne de contact essoreuse (9), en ce que la bande passe dans la section de séchage (13) dans une zone de tirage au moins partiellement ouverte, en ce que la bande a un poids de base dans la gamme 140 g/m2 à 500 g/m2 et en ce que la ligne de contact essoreuse (9) formée entre le rouleau de presse à patin supérieur (10) et le rouleau aspirant inférieur (11) est l'unique ligne de contact essoreuse (9) de la section de presses.
  2. Procédé selon la revendication 1, consistant en outre à mettre en oeuvre dans la section de presses (6) une ligne de contact de presse lisseuse (14) formée entre une paire de rouleaux lisseurs (15, 16), la ligne de contact de presse lisseuse (14) étant située entre la ligne de contact essoreuse (9) qui est unique et la section de séchage (13), à faire fonctionner les rouleaux lisseurs (15, 16) a une vitesse périphérique supérieure à la vitesse périphérique des rouleaux de l'unique ligne de contact essoreuse (9), séparant ainsi la bande fibreuse (W) du feutre de presse inférieur (8) lorsque la bande (W) sort de l'unique ligne de contact essoreuse (9).
  3. Procédé selon la revendication 1, consistant en outre à former la bande fibreuse (W) dans une section de formation (2) ayant au moins deux unités de formation (3, 4), ladite bande fibreuse (W) ayant au moins deux couches, un poids de base de 160 g/m2 à 400 g/m2, ladite bande (W) étant formée au moins partiellement à partir d'une pâte mécanique.
  4. Procédé selon la revendication 3, consistant en outre à faire passer la bande (W) à travers une ligne de contact essoreuse (17) sur la toile sans fin (5) avant de la transférer de la bande sans fin (5) à la section de presses (6).
  5. Procédé selon la revendication 1, consistant en outre à former la bande (W) pour qu'elle ait un poids de base de 160 g/m2 à 400 g/m2, et à former la bande (W) à partir d'une pâte chimique.
  6. Procédé selon la revendication 5, consistant en outre à appliquer dans l'unique ligne de contact essoreuse (9) une charge linéaire sur la bande (W), laquelle charge n'est pas supérieure à 200 kN/m.
  7. Procédé selon la revendication 1, consistant en outre à faire tourner la machine à une vitesse qui ne dépasse pas 1000 m/mn dans la section de presses (6).
  8. Procédé selon l'une quelconque des revendications 1 - 7, consistant en outre à maintenir la charge linéaire dans la presse de lissage dans la gamme de 20 kN/m à 100 kN/m.
  9. Machine de fabrication de carton, la machine comprenant :
    a) une section de formation (2) ayant au moins une toile sans fin (5) sur laquelle une bande fibreuse (W) peut être formée,
    b) en aval de la section de formation (2), une section de presses (6) ayant une seule ligne de contact essoreuse (9),
    c) dans la section de presses (6), une rouleau de presse à patin (10),
    d) dans la section de presses (6), un contre - rouleau (11) qui, conjointement avec le rouleau de presse à patin (10), forme l'unique ligne de contact essoreuse (9) de la section de presses (6),
    e) dans la section de presses (6), un premier feutre de presse (7) formant une boucle autour du rouleau de presse à patin (10),
    f) dans la section de presses (6), un deuxième feutre de presse (8) formant une boucle autour du contre - rouleau (11) de façon à pouvoir faire passer la bande fibreuse (W) à travers la seule ligne de contact essoreuse (9) en la prenant en sandwich entre le premier (7) et le deuxième (8) feutre de presse, le deuxième feutre de presse (8) ayant une course au-delà de la seule ligne de contact essoreuse (9) qui diverge de la course du premier feutre de presse (7),
    g) une section de séchage (13) située en aval de la section de presses (6),
    caractérisée en ce qu'en aval de la seul ligne de contact essoreuse (9), la machine comprend un moyen pour séparer la bande fibreuse du deuxième feutre de presse (8) lorsque la bande (W) sort de la ligne de contact essoreuse (9), en ce que le contre - rouleau (11) est un rouleau aspirant et en ce que le premier feutre de presse (7) qui boucle sur le rouleau de presse à patin (10) est agencé de manière à saisir la bande fibreuse (W) sur la toile sans fin (5) de la section de formation (2).
  10. Machine selon la revendication 9, caractérisée en ce qu'une ligne de contact de presse lisseuse (14) est située entre la section de presses (6) et la section de séchage (13) et en ce que la ligne de contact de presse lisseuse est formée par une paire de rouleaux lisseurs (15, 16) agencés de manière à venir en contact direct avec la surface de la bande fibreuse (W) de façon à ce que chaque côté d'une bande fibreuse (W) passant à travers la ligne de contact de presse lisseuse soit au contact d'un des rouleaux lisseurs (15, 16) et en ce que les rouleaux lisseurs (15, 16) sont agencés pour être entraînés à une vitesse périphérique qui dépasse la vitesse périphérique du rouleau de presse à patin (10) et du rouleau aspirant (11).
  11. Machine selon la revendication 10, caractérisée en ce que la section de formation (2) comprend au moins deux unités de formation (3, 4) de façon à ce que la bande fibreuse (W) soit formée comme une bande (W) comportant au moins deux couches.
  12. Machine selon la revendication 11, caractérisée en ce qu'un des rouleaux qui forme la ligne de contact de presse lisseuse (14) est un rouleau avec un revêtement relativement doux et un autre est un rouleau avec un revêtement relativement dur.
  13. Machine selon l'une quelconque des revendications 9 - 12, caractérisée en ce qu'elle comprend en outre une ligne de contact de presse essoreuse (17) dans la section de formation (2).
EP03794380A 2002-09-09 2003-08-28 Procede de fabrication de carton et machine de fabrication de carton Expired - Lifetime EP1546453B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
SE0202660A SE523867C2 (sv) 2002-09-09 2002-09-09 Ett förfarande för att tillverka kartong, en maskin för att tillverka kartong och ett pressparti för att avvattna en våt fiberbana
SE0202660 2002-09-09
US42029002P 2002-10-22 2002-10-22
US420290P 2002-10-22
PCT/SE2003/001330 WO2004022845A1 (fr) 2002-09-09 2003-08-28 Procede de fabrication de carton, machine de fabrication de carton et section de presse pour epaississement d'une bande fibreuse humide

Publications (2)

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EP1546453A1 EP1546453A1 (fr) 2005-06-29
EP1546453B1 true EP1546453B1 (fr) 2007-10-17

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EP03794380A Expired - Lifetime EP1546453B1 (fr) 2002-09-09 2003-08-28 Procede de fabrication de carton et machine de fabrication de carton

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EP (1) EP1546453B1 (fr)
AT (1) ATE376095T1 (fr)
AU (1) AU2003256193A1 (fr)
DE (1) DE60316971T2 (fr)
WO (1) WO2004022845A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004050593A1 (de) * 2004-10-16 2006-04-20 Voith Paper Patent Gmbh Pressanordnung
DE102005048927A1 (de) * 2005-10-13 2007-04-19 Voith Patent Gmbh Pressanordnung
DE102010029582A1 (de) * 2010-06-01 2011-12-01 Voith Patent Gmbh Nasspartie einer Maschine zur Herstellung von Faserstoffbahnen und Verwendung einer derartigen Nasspartie
DE102011004568A1 (de) * 2011-02-23 2012-08-23 Voith Patent Gmbh Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3425077A1 (de) * 1984-05-25 1985-11-28 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Doppelsieb-papiermaschine
FI96789C (fi) * 1990-11-23 1996-08-26 Valmet Paper Machinery Inc Menetelmä ja laite veden poistamiseksi paperiradasta puristamalla
SE512026C2 (sv) * 1998-05-15 2000-01-17 Valmet Corp Maskin för framställning av papper eller papp
DE19934875A1 (de) * 1999-07-24 2001-01-25 Voith Paper Patent Gmbh Papiermaschine
DE10050847A1 (de) * 2000-10-13 2002-04-18 Voith Paper Patent Gmbh Trockenpresse
EP1205600A1 (fr) * 2000-11-03 2002-05-15 Voith Paper Patent GmbH Presse à patin

Also Published As

Publication number Publication date
DE60316971D1 (de) 2007-11-29
AU2003256193A1 (en) 2004-03-29
ATE376095T1 (de) 2007-11-15
WO2004022845A1 (fr) 2004-03-18
EP1546453A1 (fr) 2005-06-29
DE60316971T2 (de) 2008-11-13

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