EP1995378A2 - Rouleau aspirant à sabot - Google Patents

Rouleau aspirant à sabot Download PDF

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Publication number
EP1995378A2
EP1995378A2 EP08152110A EP08152110A EP1995378A2 EP 1995378 A2 EP1995378 A2 EP 1995378A2 EP 08152110 A EP08152110 A EP 08152110A EP 08152110 A EP08152110 A EP 08152110A EP 1995378 A2 EP1995378 A2 EP 1995378A2
Authority
EP
European Patent Office
Prior art keywords
press
roll
suction
roller
press device
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Withdrawn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
EP08152110A
Other languages
German (de)
English (en)
Other versions
EP1995378A3 (fr
Inventor
Josef Janzer
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1995378A2 publication Critical patent/EP1995378A2/fr
Publication of EP1995378A3 publication Critical patent/EP1995378A3/fr
Withdrawn legal-status Critical Current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
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls

Definitions

  • the invention relates to a press device, in detail with the features of the preamble of claim 1; a method for converting a press device to increase the line force in a single press nip and a multi-nip press device.
  • Press sections in machines for the production of fibrous webs are previously known in a large number of designs from the prior art. Depending on the number of press gaps to be traversed, the arrangement and the design of these press nips forming rollers different press concepts are realized.
  • the press nips are produced by means of two rolls, one of which can be executed, for example, as a shoe press roll.
  • a Duo-Nipcoflex arrangement is previously known.
  • the fibrous web in the press section is guided successively through two press nips, which are formed by two press devices connected in series.
  • the first press device is characterized in that a suction press roll cooperates with a shoe press roll.
  • the suction press roll is viewed in the vertical direction as an upper roller and characterized by a rigid, that is not flexible rotatable roll shell.
  • a rigid, that is not flexible rotatable roll shell For removal of fluid or emerging from the fibrous web in the press nip water openings are provided on the roll shell, which extend from the outer periphery in the roll shell and are discharged from this over the width of the roll through the roll shell extending channels, the discharge into a corresponding end-side receiving box is done.
  • a compact press arrangement is reproduced, wherein the suction press roll in this case to the formation of two press nips, in particular of the first and the second in the fibrous web running direction successively arranged press nip, is involved.
  • the third roller which forms the second press nip with the suction press roll, forms with another shoe press roll a third press nip.
  • the leadership of the fibrous web between the individual press nips is free from a free train always on the surface of a roller.
  • a suction press roll is off DE 100 22 353 A1 known. This has on the roll shell a plurality of channels, each channel has two circumferentially offset from each other arranged from the Saugpresswalze openings and outside the press nip at least one acting on the outer surface of the roll shell suction device is present, wherein the distance of the respective openings of the channels in the circumferential direction is selected such that the suction device during rotation of the roll shell is always in communication with at least part of the openings located in the press nip via their channels.
  • line force increases are limited by the allowable for the Saugpresswalzenmantel bowl bending. If these are to be increased in a press device, a larger Saugpresswalzen malmesser is usually required for conversions, which is sometimes not at all or only at great expense in existing space, which is determined by existing ancillary equipment, such as gutters, scrapers and chairs installed , so that complex conversions are required or the possibility of a line strength increase is limited.
  • the invention is therefore based on the object to develop a Saugpresswalze, by means of which compared to conventional Saugpresswalzen with the same diameter significantly higher line forces can be driven in the press nip in cooperation with the mating roll.
  • the solution according to the invention should also be suitable in particular for retrofitting in existing press devices for increasing the deployable line force.
  • a line force increase can be achieved in press devices with suction press rolls of the same or smaller size than conventional suction press rolls by providing the suction press rolls with a deflection compensation.
  • This is arranged parallel to the longitudinal axis of the suction press roll in this, i. extends over the width of the suction press roll.
  • Decisive for a deflection compensation is the provision of a closed area.
  • two basic designs are possible according to the invention.
  • the first basic embodiment of a suction press roll according to the invention in a press device is characterized by the features of claim 1.
  • the suction press roll comprises a perforated roll shell which encloses an inner space, wherein at least one suction zone extending in the circumferential direction over at least a partial region of the inner circumference of the roll shell is arranged in the interior space.
  • a shoe press roll acting or acting against the inner circumference of the roll mantle of the suction press roll is arranged in the interior of the roll mantle.
  • the shoe press roll By means of the shoe press roll, it is possible because of their closed shell, on the inner circumference of the press jacket of the suction press roll on this in the region of the press nip increased support force across the width, that is parallel to the longitudinal axis of the suction press roll, applying a counterforce to the force of the backing roll in this area generated.
  • This makes it possible to set an increase in the line force in the press nip compared to conventional suction press rolls, with the shoe press roll depending on the design and local or locally different line force profiles over the width of the suction press roll are adjustable.
  • the setting can be made continuously or stepwise.
  • the shoe press roll in the interior is arranged in the suction zone.
  • the suction region extends parallel to the longitudinal axis of the suction press roll and viewed in the circumferential direction on the inner circumference over a part of these, wherein the arrangement of the suction zone is such that it viewed on the inner circumference in the direction of passage of the fibrous web from an area in front of the Pressing gap extends beyond this.
  • the shoe press roll with the suction box forms a Vorsaughunt, which is considered in the fibrous web running direction in front of the press nip and a behind the press nip, that is, after the outflow from this becoming effective holding zone.
  • the press cover of the suction press roll itself is provided with passage openings which extend from the outer circumference of the press cover to the inner circumference and thus provide a connection between the outer circumference and the interior of the suction press roll, in particular the suction zone.
  • the shoe press assembly comprises a revolving flexible belt which is pressed against the inner circumference of the press roll of the suction roll via a pressing unit.
  • This circulating belt on the one hand separates the suction region of the suction roll from the area of the shoe press and also creates a suction zone boundary. It is exploited that once evacuated suction holes maintain their vacuum even when not aspirated in part.
  • the band is impermeable and has a closed lateral surface.
  • Saugpresswalzenmantel traditionally drilled Saugpresswalzenmäntel can be used.
  • Umbaufall Saugpresswalzenmäntel can be used to be retrofitted accordingly.
  • the passage openings extend in the radial direction from the outer periphery to the inner periphery, i. perpendicular to the longitudinal axis of the suction press roll.
  • the integrated in the Saugpresswalze shoe press roll can be a standard version that needs to be modified only with regard to the installation in the Saugpresswalze.
  • the shoe press roll itself includes a pressing unit, preferably with a pressing element in the form of a press shoe, whose contact surface is convex and extending partially in the circumferential direction and further over the width, that is parallel to the longitudinal direction of the press roll.
  • the support can be done for example via piston elements, spring devices, accumulator elements on a support element.
  • the flexible press cover of the shoe press roll is made of a wear-free or highly wear-resistant material to avoid unnecessary change of the flexible band.
  • suction box in the interior of the press roll is sealed relative to the inner circumference of the press jacket via corresponding sealing devices.
  • a second embodiment of the solution according to the invention consists in combining two concepts known from the prior art with one another in a press roll. This is achieved by the suction device is no longer effective in the interior and thus the fluid-gas mixture does not have to be carried into the interior of the press jacket to be discharged from there, but is guided directly through the press cover and preferably laterally in Suction of area of the end faces. As a result, the inner surface describing the inner circumference of the press jacket can be kept closed, wherein the closed design makes it possible here to resort to press units which make it possible to adjust the line force in particular across the width or parallel to the longitudinal axis of the press roll.
  • pressing units are provided which comprise one or a plurality of pressing elements, which are effective on the inner circumference or exert a pressure on this in the direction of the press nip and thus generate a supporting force to the counter roll.
  • pressing units are provided which comprise one or a plurality of pressing elements, which are effective on the inner circumference or exert a pressure on this in the direction of the press nip and thus generate a supporting force to the counter roll.
  • different sub-variants can be combined with one another here.
  • a second yoke is additionally provided, on which on the inner circumference effective piston elements for the purpose of bending compensation or extending over the width of the pressing element can be supported.
  • the producible line force can also be influenced via the locally different, in particular zonal, control of the supporting elements, in particular piston elements. As a result, a sensitive adjustment of the deflection compensation is possible.
  • the leadership of the fluid-gas mixture through the roll shell has the advantage that the suction zone is not integrated in the roller and thus their deflection does not limit the maximum possible line force.
  • the leadership in the roll shell can be done in various ways. According to a first embodiment, openings are provided which extend from the outer circumference of the roll shell in this and are discharged therefrom via central channels or through-holes in the frontal areas and from there via separate facilities, that is, outside the roller continued.
  • Another possibility is not to connect the holes via a central bore with a corresponding suction device, but to lay the holes through the press cover, that always in use in press facilities, the opening on the surface, that is the outer shell in the press nip and the second other opening in an area outside the press nip, in which case a device for suction should be provided in this case.
  • the counter rolls to the suction press rolls designed according to the invention may be rollers of various types.
  • the counter roll can be designed as a so-called Nipcoflex roll, that is, an extended press nip is achieved by guiding a flexible roll shell over a concave / convex molded press shoe.
  • the mating roll can also be a solid shell roll.
  • the solution according to the invention for suction press rolls is used in press devices in which at least two suction press rolls of the same type are provided in a press device.
  • a simple replacement of conventional Saugpresswalzen with the effect of a line force increase by replacement by inventively designed Saugpresswalzen is possible.
  • the solution according to the invention can be used in a press device, in particular a multi-nip press device, comprising a first press device and a second downstream press device.
  • the first press device comprises a first roller which forms a first press nip with a second roller as a counter roller and a second press nip downstream of the first press nip in the fibrous web passage direction with a central roller, and a third press nip which is formed between the central roller and a third roller.
  • Downstream of the first press device is a second press device comprising two rollers forming a further fourth press nip.
  • the first roller of the first press device and a roller of the second press device are designed as suction press rolls, preferably according to the invention.
  • the Saugpresswalzen are identical, so they are interchangeable and storage for spare parts can be reduced.
  • FIG. 1 illustrates a schematic simplified representation of a press device 1, comprising a first press roll 2 and a second press roll 3, which form a press nip 4 with each other, a particularly advantageous embodiment of a suction press roll 5 according to the invention, which corresponds to the upper first press roll 2 in the installed position, with integrated and eccentric to Saugpresswalze arranged shoe press roll 6.
  • a fibrous web not shown here is passed together with at least one felt belt.
  • the suction roller 5 acting as the first roller 2 has a rigid, that is to say stable or inflexible, perforated roller shell 7, which encloses an inner space 8 of the suction pressure roller 5 in the circumferential direction.
  • the roll shell 7 is characterized by an outer circumference 9 and an inner circumference 10.
  • a roll shell 7 with a perforation which is formed by aligned in the radial direction, extending from the outer periphery 9 to the inner periphery 10 through holes 11, and thus allows a connection between the environment and the interior 8
  • at least one suction zone S is provided in the interior 8, which extends in the circumferential direction over at least a portion of the inner periphery 10 of the roll shell 7 and is formed in the simplest case of a storage-stable or stationary suction box 12. This is sealingly guided with respect to the inner circumference 10.
  • a shoe press roll 6 is arranged in the interior 8. This is provided on the inner circumference 10 in the installation position in the region of the press nip 4.
  • the shoe press roll 6 comprises a flexible circulating belt 13 and an in the enclosed space 13 enclosed by the belt 14 pressing unit 15, comprising at least one or preferably a plurality of pressing elements 16, with their facing the inner periphery 17 of the belt 13 and a contact surface 18 forming surface against These are pressed.
  • the contact surface 18 is designed convexly curved.
  • the pressing unit 15 acts indirectly against the inner circumference 10 of the roll shell 7 of the suction press roll 5, whereby the line pressure in the press nip 4 is reinforced via the shoe press roll 6.
  • the pressing unit 15 comprises, as already stated, preferably a pressing element 16 in the form of a press shoe 19, which is supported on a stationary support body 20 via means 21 for generating the required contact force, for example in the form of a row of pistons or at least one, preferably a plurality of pressure chambers , The pressure on the pressing element 16 is adjusted via the means 21 between the press shoe 19 and the support body 20.
  • the adjustment can be made across the width, that is, parallel to the longitudinal axis L of the suction press roll 5 steplessly or in steps as well as over the entire width as well as zone-wise.
  • the suction box 12 is arranged such that it virtually surrounds the shoe press roll 6 to form a Vorsaughunt 22 and a holding zone 23.
  • the circulating belt 13, which is liquid and druckun preparer the suction region S of the suction press roll 5 is separated from the area of the shoe press roll 6, as well as a Saugzonenbegrenzung created. It is exploited that a once evacuated suction bore in the form of through holes 11 maintains its vacuum even when not aspirated in part.
  • the arrangement of Saugpresswalze 5 in the press device 1 is preferably carried out in the vertical direction above the second roller 3. Other arrangements are also conceivable.
  • the passage openings 11, which extend from the outer periphery 9 to the inner space 10 fluid is taken up and sucked into the suction box 12 and discharged therefrom.
  • the inlet-side region between the suction box 12 and the shoe press roll 6 forms a Vorsaughunt 22, while after passing through the press nip of the outlet side of the press nip 4 arranged region of the suction zone S acts as a holding zone 23.
  • the area facing away from the press nip 4 is free from the effect of the suction box 12.
  • the suction box 12 extends over part of the inner circumference 10, this portion extends from an area in front of the press nip 4 to behind the press nip 4.
  • the suction region preferably extends over at least a quarter, most preferably over half of the inner surface of the inner periphery 10 viewed in the circumferential direction.
  • the line force in the press nip 4 can be varied by the means 21.
  • this is associated with a device for controlling the contact pressure as a function of the line force to be set.
  • the execution of the shoe press roll 6 can be made of conventional execution concepts.
  • the press shoe 19 can be lubricated hydrostatically and / or hydrodynamically.
  • the actuation of the pressing elements is preferably carried out hydraulically. Other versions are also conceivable.
  • FIGS. 2 and 3 illustrate in schematic highly simplified representation based on a perspective view of a first embodiment of a press device 1 with a deflection compensation according to the second basic design.
  • the press device 1 here also comprises two rollers, a first roller 2 and a second roller 3, wherein the first roller 2 is designed as a suction press roller 26 and comprises a rigid roller shell 27. Both press rolls, first press roll 2 and second press roll 3, form a press nip 4 with each other.
  • the counter-roller in the form of the second roller 3 can be designed in various ways. This can be designed as a shoe press roll with a flexible press cover with at least one pressing unit with a curved surface or as a solid roller 6.
  • the first roll 2 is designed as a drawn roll in the form of the suction press roll 26.
  • a plurality of holes 28, which preferably extend over the entire width of such a pressing device 1, that is transverse to the machine direction when used in machines for producing fibrous webs, are provided, which may preferably also be distributed over the circumference.
  • a plurality of such bores is associated with a central suction channel 29, which connects these bores 28 with each other and is coupled to a suction device 30 in the region of the front side of the first press roller 2, which is shown here only schematically for clarification of the function.
  • the holes 28 extend only in the roll shell 27, that is from the outer periphery 31 in the direction of the inner circumference 32 of the roll shell 27, but not through and the central suction duct 29 extends through the roll shell thickness d 27 of the roll shell 27.
  • the inner surface of the roller shell 27 describing the inner circumference 32 is obtained as a closed surface, so that it can be supported uniformly over the machine width on at least one support body 35.
  • the first press roll 2 further comprises a pressing unit 34, which is arranged inside the roll shell 27, in particular in the interior space 33, and is supported on the support body 35.
  • the pressing unit 34 comprises at least one, preferably a plurality of pressing elements 36, preferably in the form of piston elements 37 which are movable relative to the surface formed by the inner periphery 32, preferably perpendicular thereto, and against the inner periphery 32 are pressed.
  • the piston elements 37 are arranged parallel to the longitudinal axis L of the suction press roll 26, wherein these are individually or jointly or in groups controllable.
  • the further pressing unit 39 serves to support in this press nip 38.
  • the pressing unit 39 consists either of a plurality or a pressing member 40, preferably in the form of a piston member 48th Die
  • FIG. 2 illustrates an example in which optionally a further yoke 41 is provided as a support member for the pressing unit 39.
  • This likewise preferably has a plurality of piston elements which, with their surface facing the inner circumference 32 of the roll mantle 27, act on the inner circumference 32 of the roll mantle 27.
  • Other versions are conceivable.
  • About the actuation of the pressing a deflection compensation can be realized.
  • the FIG. 2 illustrates an example of a possibility with additional second support body 35 and second pressing unit 39. Other designs are conceivable.
  • FIG. 3 illustrates a press device 1 in analogy to FIG. 2 according to the second basic embodiment of the solution according to the invention with a Anpresstician 34, which is on the inner circumference 32 of the roll shell 27, which is designed as a rigid, that is not flexible and thus dimensionally stable press jacket is effective.
  • a press device 1 in analogy to FIG. 2 according to the second basic embodiment of the solution according to the invention with a Anpresstician 34, which is on the inner circumference 32 of the roll shell 27, which is designed as a rigid, that is not flexible and thus dimensionally stable press jacket is effective.
  • the suction press roll 26 in the roll shell 27 a plurality of channels 42, each channel 42 at least two circumferentially offset from each other, from the suction press roll 26 leading openings 43, 44 has.
  • the holes do not extend as in the FIG.
  • each one of the openings 43, 44 is connected in a functional position with the press nip 4, while the other cooperates with a arranged outside the Saugpresswalze 26 suction device 30.
  • at least one pressing unit 34 is provided in the interior 33 of the first roller 2, which analogous to the in FIG. 2 shown and described may be executed.
  • the second embodiment is characterized by a combination of the known features of a rigid roll shell with openings for the purpose of Besausgens or guiding the liquid-gas mixture through the shell 27 and an arrangement of a pressing unit 34, which is effective on the inner periphery 32 of the roll shell 27 and this supported on the support body, in particular yoke.
  • FIGS. 1 to 3 clarify possible designs of Saugpresswalzen.
  • the FIG. 4 illustrates a particularly advantageous use according to the invention designed Saugpresswalzen 5 and 26 in a Mehrspaltpressenvortechnisch 45 in the form of a Duocentri Nipcoflex press device.
  • the FIG. 4 shows a schematic highly simplified representation of a section of the press device 45 comprising a first press means 46 for forming three consecutive press nips with a first roll 2 and a Saugpresswalze 5 or 26 according to the first or the second embodiment, with a further second roller 3 forms a first press nip 4 as a counter roll.
  • a central roller 47 is provided, which forms a further second press nip 38 with the first roller 2 designed as a suction press roller 5 or 26.
  • the central roller 47 in turn forms a third press nip 50 with a roller 49.
  • the fibrous web F is guided along the outer circumference at the individual press rollers 2, 3, 47, 49, wherein the guide is at least in the first and third press nip 4 always done with a felt belt.
  • the guide of the fibrous web F takes place in the first press nip 4 between two felt belts FB1 and FB2, wherein the first felt belt FB1 wraps around the suction press roll 26, 5 and the second felt belt FB2 wraps around the second roll 3 as underfelt. Furthermore, the fibrous web F is guided directly along the surface of the central roller 47 and at this through the third, simply felted press nip 50. After passing through the third press nip 50, the fibrous web F by another second, preferably double-felted press device 51 between the felt belts FB3 and FB4 led.
  • the press device 51 is in turn designed such that it comprises a roller in the form of a press roll 5 or 26 according to the first Embodiment or the second embodiment, which forms a fourth press nip 53 with a counter-roller 52.
  • the FIG. 4 describes a Duo-Nipcoflex press arrangement with a downstream fourth press nip.
  • the rollers 3 and 52 can be designed as solid shell rolls or shoe press rolls.
  • the first roller 2 and a roller of the second press device are designed as suction press rolls of identical construction in order to minimize storage.

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  • Paper (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP08152110A 2007-05-25 2008-02-29 Rouleau aspirant à sabot Withdrawn EP1995378A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007024508A DE102007024508A1 (de) 2007-05-25 2007-05-25 Schuhsaugpresswalze

Publications (2)

Publication Number Publication Date
EP1995378A2 true EP1995378A2 (fr) 2008-11-26
EP1995378A3 EP1995378A3 (fr) 2010-01-13

Family

ID=39712672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08152110A Withdrawn EP1995378A3 (fr) 2007-05-25 2008-02-29 Rouleau aspirant à sabot

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US (1) US20090126892A1 (fr)
EP (1) EP1995378A3 (fr)
DE (1) DE102007024508A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018119383A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Wellpappenrohpapierbahn
DE102018119381A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Pressanordnung
CN110815839A (zh) * 2019-10-12 2020-02-21 镇江现代包装有限公司 一种食品包装膜生产专用复合设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022353A1 (de) 2000-05-08 2001-11-15 Voith Paper Patent Gmbh Saugpresswalze
EP1445375A1 (fr) 2003-01-31 2004-08-11 Voith Paper Patent GmbH Rouleau principal ventilé pour presse de machine à papier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI70951C (fi) * 1984-11-29 1999-05-19 Valmet Oy Menetelmä paperikoneen puristinosassa kudosten ja telojen vaihtamiseks i sekä menetelmää soveltava puristinosan runkorakenne
DE4402513A1 (de) * 1994-01-28 1994-07-07 Voith Gmbh J M Pressenpartie einer Papiermaschine
JP2000516668A (ja) * 1996-08-22 2000-12-12 フォイト ズルツァー パピーアマシーネン ゲゼルシャフト ミット ベシュレンクテル ハフツング 特にペーパウェブ、ボール紙ウェブ又は繊維ウェブのような材料ウェブを形成又は処理するサクションローラ
DE19724911A1 (de) * 1997-06-12 1998-12-17 Voith Sulzer Papiermasch Gmbh Preßeinheit
AT408461B (de) * 1999-11-17 2001-12-27 Andritz Ag Maschf Vorrichtung zur entwässerung einer faserstoffbahn
DE10239906A1 (de) * 2002-08-30 2004-03-18 Voith Paper Patent Gmbh Naßpressenanordnung
AT412218B (de) * 2002-10-17 2004-11-25 Andritz Ag Maschf Presswalze

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10022353A1 (de) 2000-05-08 2001-11-15 Voith Paper Patent Gmbh Saugpresswalze
EP1445375A1 (fr) 2003-01-31 2004-08-11 Voith Paper Patent GmbH Rouleau principal ventilé pour presse de machine à papier

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Publication number Publication date
US20090126892A1 (en) 2009-05-21
DE102007024508A1 (de) 2008-11-27
EP1995378A3 (fr) 2010-01-13

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