EP2722435A1 - Bandanordnung - Google Patents

Bandanordnung Download PDF

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Publication number
EP2722435A1
EP2722435A1 EP12189020.6A EP12189020A EP2722435A1 EP 2722435 A1 EP2722435 A1 EP 2722435A1 EP 12189020 A EP12189020 A EP 12189020A EP 2722435 A1 EP2722435 A1 EP 2722435A1
Authority
EP
European Patent Office
Prior art keywords
press
roll
metal belt
nip
belt
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.)
Granted
Application number
EP12189020.6A
Other languages
English (en)
French (fr)
Other versions
EP2722435B1 (de
Inventor
Riku Pihko
Petter Honkalampi
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
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Priority to EP12189020.6A priority Critical patent/EP2722435B1/de
Publication of EP2722435A1 publication Critical patent/EP2722435A1/de
Application granted granted Critical
Publication of EP2722435B1 publication Critical patent/EP2722435B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/08—Pressure rolls
    • D21F3/086—Pressure rolls having a grooved surface
    • 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
    • D21F5/18—Drying webs by hot air

Definitions

  • the invention pertains to a belt assembly for a paper or board making machine, and in particular to a belt assembly adapted to move a web from a press section of a paper or board making machine to a dryer section of the paper or board making machine.
  • a center roll based press concept such as the one shown in Fig. 6 has been offered by the applicant for a long time under the name SymPress B.
  • a center roll 1 forms two press nips together with a press roll 3 and a press roll 5, respectively.
  • the press roll 3 can be a suction roll
  • the press roll 5 can be a shoe roll.
  • the web to be dewatered is passed through the nip formed between the press roll 3 and the center roll 1, is guided about the center roll 1, and is then passed through the second nip formed between the center roll and the press roll 5. Thereafter, the web is handed over to a wire 11 guided about a guiding roll 9 located in the dryer section. From there, the web is transferred to a first dryer cylinder 7 of the dryer section of the paper or board making machine.
  • a dry content of the treated web of up to 46 to 50% can be achieved while a running speed of the web can be between 1360 to 1420 m/min.
  • a belt assembly which is adapted to move a web from a press section of a paper or board making machine to a dryer section of the machine.
  • the belt assembly comprises a combination of a first and a second press roll forming a first press nip, a third press roll forming a second press nip, preferably a shoe press nip, with the first press roll and one or more stretcher/guiding rolls to be arranged between the press section and the dryer section.
  • a heat conductive metal belt that forms an endless loop and that is impervious to fluids passes through the first press nip and over the first press roll, through the second nip and over the one or more stretcher/guiding rolls.
  • One of the one or more stretcher/guiding rolls within the metal belt loop is arranged in close proximity of the second press roll such that a portion of the metal belt wraps a circumferential portion of the second press roll, thereby extending the first press nip by means of the wrapped metal belt.
  • this respective portion will be called metal belt tension nip throughout the application.
  • the second press roll can be a suction roll.
  • an increased tension can be applied onto the web to be treated in order to improve water removal there from.
  • the first nip formed by the first press roll and the second press roll can be extended against the running direction of the web. Due to extending the length of the nip, the dry content of the web can be further increased while the web is still in the press section.
  • a water receiving felt can be arranged on either side of the web in order to arrange void volume for water to be removed.
  • the dryer section can be of a reduced length having fewer dryer cylinders.
  • a remarkable amount of installation space and energy can be saved, e.g. for heating dryer cylinders.
  • a length of the circumferential portion of the second press roll wrapped by the metal belt can be in a range between 500mm and 1500mm and/or in a range from 20% to 40% of the circumference of the second press roll.
  • the one stretcher/guiding roll arranged in close proximity of the second press roll can be movable in order to change the length of the wrapped surface portion and/or the pressure in the metal belt tension nip.
  • the length of the circumferential portion of the second press roll wrapped by the metal belt forming the metal belt tension nip and/or the pressure in the metal belt tension nip can be changed, accurate adjustment of the dry content of the web is possible. Furthermore, by changing the length of the metal belt tension nip and/or the pressure in the metal belt tension nip, the structure of the web can be influenced as it might be necessary.
  • a length of the metal belt between the one stretcher/guiding roll and the second press roll can be shorter than the length of the wrapped circumferential portion.
  • the first press nip and the second press nip can be arranged in an opposed manner.
  • the belt assembly can be adapted to hand over the web to the dryer section at a first roll or cylinder or between the first two rolls or cylinders of the dryer section.
  • the belt assembly of the invention it is possible to hand over the web to a dryer section at a suitable position.
  • the belt assembly can be adapted to the given conditions of the paper or board machine to be rebuilt.
  • heating means can be provided with respect to the running direction of the metal belt at a location upstream of the metal belt tension nip.
  • the heating means it is possible to increase the metal belt temperature before the metal belt tension nip.
  • the heating means can be adapted to increase the metal belt temperature to over 110 degrees in a portion before the metal belt contacts the second press roll.
  • the length of the metal belt tension nip and the design of the first and second press rolls can be such that the metal belt temperature decreases to less than 110 degrees downstream of the press nip.
  • the metal belt temperature is above 110 degrees when the metal belt contacts the second press roll at the beginning of the metal belt tension nip, a combined steam enhanced water removal and pressing process having remarkably good water removal and heating properties can be enabled. Furthermore, a sufficient decrease of the output temperature of about 10 degrees or more entails that, downstream of the nip, the web is attached to the metal belt surface. Therefore, additional heat conduction from the metal belt to the web and an improved evaporation rate from the web on the metal belt surface is possible. Thus, the dry content and the temperature of the web can be raised with different paper and board grades.
  • a heating means and/or a pressure applying means advantageously can be provided at the portion of the metal belt wrapping the circumferential portion of the second press roll.
  • the second press roll is located outside of the metal belt loop.
  • the metal belt also wraps a portion of the second press roll. Directly at the location of the end of this nip formed between the outside of the metal belt and the second press roll, the metal belt wraps the circumferential portion of the first press roll inside the metal belt loop, thus, forming the metal belt tension nip.
  • the above mentioned heating means and/or pressure applying means can be provided in a combined manner, e.g. in the form of a steam heating chamber capable to apply heat by releasing steam as well as to apply pressure due to the released steam.
  • a steam heating chamber is to be understood as being sealed against the heatable metal belt.
  • the chamber space can be pressurized by steam inside of the chamber.
  • two steam chambers being opposed via the metal belt can be provided in order to compensate their bending forces.
  • a higher steam pressure also leads to an increase of the steam temperature.
  • one, more or all of the first, the second and the third press rolls and the stretcher/guiding rolls can be grooved rolls.
  • the groove width of the first, second and third press roll can be less than or equal to twice the thickness of the metal belt.
  • the groove width of one or more of the stretcher/guiding rolls can be less than or equal to the thickness of the metal belt.
  • one or more of the rolls are grooved rolls, they are capable of absorbing a certain amount of water between the respective roll and the belt. Grooving of the rolls ensures a good grip, i.e. a high coefficient of friction, between the respective roll and the metal belt even in a case where an occasional water film is present on the surface of the roll or of the metal belt. Thus, neither the driving power nor the dimension of the belt can become affected by such a water film.
  • the width of the grooves is configured to be as small as possible.
  • a nip load in the metal belt tension nip and/or in the second press nip formed between the third press roll and the first press roll can be in a range between 150 and 300 kN/m.
  • An adjustable nip load can ensure an exact nip load, depending on the circumstances.
  • a suction box can be provided at the second press roll and/or the second press roll can be formed as a suction roll.
  • a paper or board making machine comprises a press section and a dryer section and a belt assembly as described above.
  • the belt assembly can be adapted to hand over the web to the dryer section at one of the first two rolls/cylinders of the dryer section or between the first two rolls/cylinders of the dryer section.
  • a paper or board making machine provided with a belt assembly according to the invention has the particular advantage that an effective heating upstream of the press nip can be performed before the actual water removal in the press nip takes place. Another advantage is that a higher dry content of the web is achieved downstream of the press section.
  • the invention is preferably applicable to grammages over 100g/m 2 . Such grammages require a comparably long time until the heat conduction from the metal belt into the web is completed.
  • Fig. 1 shows a schematic sectional view of a belt assembly incorporated between a press section and a dryer section of a paper or board making machine according to a first embodiment of the invention.
  • a heat conductive metal belt 21 is guided about a center roll 11 of a press section and to stretcher/guiding rolls 17, 19 in an endless loop.
  • a first press nip in the running direction of a web to be treated is formed between the center roll 11 and a second press roll 15 embodied as a suction roll.
  • the second press roll 15 does not have to be a suction roll at all costs, but can be any other suitable kind of roll.
  • a felt 25 serves for transporting the web to be treated towards the press nips, that is, towards the second press roll 15.
  • a second press nip being a shoe press nip located downstream of the first nip is formed between the center roll 11 and third press roll 13.
  • press roll 13 is a shoe roll.
  • the third press roll is a shoe press roll.
  • the metal belt 21 is guided about the center roll 11 such that the center roll 11 is arranged within the closed loop of the metal belt 21.
  • the surface of the metal belt 21 arranged on the outer side of the closed loop serves for taking over the web at the press section, particularly at the nip formed by the center roll 11 and the press roll 15, and transmitting the same to the dryer section.
  • the web is detached from the metal belt 21 for further treatment.
  • the web is handed over to a fabric 27 guided about a suction roll 26 and being in contact with the metal belt at a location downstream of the second nip formed between the center roll 11 and the second press roll 13. Carried on the fabric 27, the web is then transferred to the first dryer cylinder 23 in a row of dryer cylinders.
  • the dryer section mainly consists of two rows of dryer cylinders and turning rolls 24 arranged in a parallel and displaced manner such that the web is alternately guided about cylinders 23 of the first row and turning rolls 24 of the second row, respectively.
  • the stretcher/guiding roll 17 is arranged closely to the second press roll 15 such that the metal belt 21 outer surface gets into abutment with the surface of the second press roll 15. Thereby, a felt 25 carrying the web and the web carried thereon are sandwiched between the outer surface of the metal belt 21 and the felt 25 on the second press roll 15. Since the stretcher/guiding roll 17 is arranged closely to the second press roll 15, a metal belt segment 21a between the portion where the metal belt 21 gets into abutment with the second press roll 15, and the nip formed between the center roll 11 and the second press roll 15 is wrapped about the respective circumferential portion of the second press roll 15. Thereby, due to the metal belt 21 abutting on the press roll 15, the nip formed between the center roll 11 and press roll 15 is extended against the running direction of the web, thereby forming a metal belt tension nip according to the invention.
  • the length of the metal belt tension nip formed between the metal belt segment 21a and the circumference of the second press roll 15 as well as the pressure within this metal belt tension nip can be altered.
  • the length of the metal belt tension nip can be from 500 mm to at least 1000 mm, which corresponds to about 20 to 40% of the circumference of the second press roll 15.
  • An additional felt 29 is provided and guided through the nip formed between the center roll 11 and the third press roll 13. Since there are at least two felts provided in the press section, that is the felt 25 going through the metal belt tension nip formed by the metal belt wrapped about the second press roll 15 and the felt 29 going through the nip formed by the center roll 11 and the third press roll 13, a large amount of water can be removed within the press section.
  • Fig. 2 is a schematic sectional view and shows a second embodiment of a belt assembly according to the invention.
  • elements corresponding to those of the previously described first embodiment will have the same reference signs and their description will not be repeated.
  • the press rolls 13 and 15 are arranged in such a manner that the two nips formed by the center roll and the respective press rolls 13 and 15 are opposed to each other. That is, in the sectional view, a straight line from one of the two nips to the other of the two nips goes through the center point of the center roll 11.
  • Fig. 2 the possibility to form a very long wrap around press roll 15 is shown. It is to be noted, however, that such a long metal belt tension nip is not restricted to the embodiment shown in Fig. 2 , but can be applied with any of the embodiments or modifications of the invention.
  • Fig. 3 is a schematic sectional view of a third embodiment of the invention. In Fig. 3 merely the press section as well as the belt assembly is shown.
  • steam chambers 33 and 35 serving as heating means of the invention are provided between the stretcher/guiding rolls 19 and 17.
  • the steam chambers 33, 35 serve to heat the metal belt 21.
  • the steam box 33 is provided outside of the closed loop, while steam box 35 is provided inside of the closed loop.
  • both surfaced of the metal belt that is, the inner surface and the outer surface can be independently heated. Since these steam chambers 33 and 35 are arranged opposite to each other, they compensate bending of the metal belt 21, because each respective steam chamber 33, 35 encounters the steam pressure force of the respectively other steam chamber 35, 33.
  • a steam chamber 37 is provided adjacent to the second press roll 15 and is used for heating the outer surface (i.e. the surface inside the closed loop) of a portion 21a of the metal belt 21 being wrapped about the second press roll 15.
  • heat supplied from the steam chamber 37 to the wrapping metal belt portion 21a of the metal belt 21 can act on the web in the metal belt tension nip after having been transported to the web by means of heat convection through the metal belt portion 21a.
  • the pressure in the metal belt tension nip can be also manipulated.
  • a steam shoe 38 is placed prior to the metal belt tension nip.
  • the steam shoe 38 serves to heat at least one felt 31 being passed through the two nips formed by the center roll 11 and the two press rolls 13, 15, respectively.
  • the steam shoe 38 directly contacts the same.
  • the steam shoe 38 has a curved smooth cover plate having at least one steam opening directed to the contacted felt 31. Preferably some holes or discrete rows of openings are arranged against the felt 31. Due to the contact with the steam shoe 38, the felt 31 is slightly bent.
  • the steam shoe cover is lubricated.
  • a surface the steam shoe 38 is made from a sheet metal and comprises plural holes. Since the surface of the steam shoe 38 preferably has a convex shape, it is capable of bending the moving felt a bit. In contrast, known prior art devices have nozzles. Thus, these prior art devices are provided in a short distance of the felt, but are not in abutment against the felt.
  • a steam box 40 for directly heating the web is provided at the begin of the metal belt tension nip.
  • the steam box 40 directly heats the web by means of direct steam blows through nozzles.
  • the steam box 40 is not absolutely required for the invention.
  • Fig. 4 is a schematic sectional view of a modification of the third embodiment, in which an additional felt 39 is provided for supporting the web before entering the metal belt tension nip.
  • the felt 39 is a so called bottom felt and enables water removal in a downwards direction from the bottom side of the web.
  • the dry content of the bottom side of the web as well as an oil absorption are improved, leading to that both sides of the web correspond to each other.
  • Fig. 5 is a sectional view of a fourth embodiment of the invention.
  • the press rolls 11, 13, 15 and the stretcher/guiding rolls 17, 19 are grooved rolls.
  • a maximum groove width is the thickness of the belt, while in the stretcher/guiding rolls 17, 19, the maximum groove width is twice the thickness of the belt.
  • the lands between the grooves are excessively larger than the grooves in the rolls.
  • the narrow grooves do not affect the guidability of the metal belt 21. This is a very important factor, because an exceptionally accurate guiding of the belt with merely a few millimeters' tolerance is required in order to prevent adverse effects on the paper or board making process.
  • heating means such as those described with regard to Figs. 3 and 4 can be provided with the embodiments of Figs. 1 , 2 or 5 .
  • the heating means can be provided, or their position can be altered.
  • the steam chambers 33 and 35 are shown in an opposed manner, they can be displaced against each other or one of the steam chambers can be completely absent.
  • other suitable heating means such as hot air blowers, infrared heaters, etc. can be provided inside or outside of the closed loop of the metal belt.
  • Fig. 5 all rolls are embodied as grooved rolls, depending on the need, any combination of non grooved rolls and grooved rolls is possible.
  • the press rolls can be grooved rolls while the stretcher guiding rolls are plain rolls.
  • a most promising arrangement, in particular when steam chambers are used inside the loop, is to provide at least the stretcher guiding roll adjacent to the second press roll as well as the center roll as a grooved roll. Thereby, water present on the belt from the steam chambers or from the steam heating chamber can be absorbed by the grooved roll, thus enabling a smooth run of the metal belt.

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  • Paper (AREA)
EP12189020.6A 2012-10-18 2012-10-18 Bandanordnung Active EP2722435B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12189020.6A EP2722435B1 (de) 2012-10-18 2012-10-18 Bandanordnung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12189020.6A EP2722435B1 (de) 2012-10-18 2012-10-18 Bandanordnung

Publications (2)

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EP2722435A1 true EP2722435A1 (de) 2014-04-23
EP2722435B1 EP2722435B1 (de) 2016-05-04

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EP12189020.6A Active EP2722435B1 (de) 2012-10-18 2012-10-18 Bandanordnung

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EP (1) EP2722435B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016042198A1 (en) 2014-09-15 2016-03-24 Upm-Kymmene Corporation Process to manufacture low weight high quality paper for use as a support layer of a release! liner with a belt assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129842A1 (en) * 2008-04-21 2009-10-29 Metso Paper, Inc. Press section of a web forming machine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009129842A1 (en) * 2008-04-21 2009-10-29 Metso Paper, Inc. Press section of a web forming machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016042198A1 (en) 2014-09-15 2016-03-24 Upm-Kymmene Corporation Process to manufacture low weight high quality paper for use as a support layer of a release! liner with a belt assembly
US10280562B2 (en) * 2014-09-15 2019-05-07 Upm Specialty Papers Oy Process to manufacture low weight high quality paper for use as a support layer of a release liner with a belt assembly

Also Published As

Publication number Publication date
EP2722435B1 (de) 2016-05-04

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