US20070245589A1 - Runnability of Web in a Material Web Machine - Google Patents

Runnability of Web in a Material Web Machine Download PDF

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Publication number
US20070245589A1
US20070245589A1 US11/736,963 US73696307A US2007245589A1 US 20070245589 A1 US20070245589 A1 US 20070245589A1 US 73696307 A US73696307 A US 73696307A US 2007245589 A1 US2007245589 A1 US 2007245589A1
Authority
US
United States
Prior art keywords
vacuum
wire
runnability
web
source
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.)
Abandoned
Application number
US11/736,963
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English (en)
Inventor
Jorma Laapotti
Markku Lummila
Rami Aaltonen
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
Assigned to METSO PAPER, INC. reassignment METSO PAPER, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AALTONEN, RAMI, LAAPOTTI, JORMA, LUMMILA, MARKKU
Publication of US20070245589A1 publication Critical patent/US20070245589A1/en
Assigned to VALMET TECHNOLOGIES, INC. reassignment VALMET TECHNOLOGIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: METSO PAPER, INC.
Abandoned 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
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D21F5/042—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices
    • D21F5/046—Drying on cylinders on two or more drying cylinders in combination with suction or blowing devices using pocket ventilation systems
    • 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
    • D21F5/185—Supporting webs in hot air dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/14—Advancing webs by direct action on web of moving fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2601/00—Problem to be solved or advantage achieved
    • B65H2601/20—Avoiding or preventing undesirable effects
    • B65H2601/21—Dynamic air effects

Definitions

  • the present invention is generally related to material web machines. More precisely, the present invention concerns a method and runnability device for achieving improved runnability of the material web in a material web machine, when the web progresses in the machine direction (MD), in other words in the direction of travel of the web, supported by a wire to a closing gap between the following support roll and the wire.
  • MD machine direction
  • the present invention can be used for example in conjunction with a vacuum box in a drying unit of a material web machine, but the present invention can also be applied in conjunction with other types of drying unit concepts and web transfer concepts.
  • material web machine refers generally to all types of machines used for the processing of web-like materials, where the web-like material can be:
  • FI publication 113973 presents a method and device for stabilizing the movement of a web wire in the press section of a material web machine in a rectilinear transfer of the web, while supported by a fabric, from one roll to a second roll, in other words on a support distance of the web wire.
  • the web support device intensifies the vacuum effect on the fabric side in critical areas such as in the opening and closing gaps, and also in the edge areas of the web.
  • suction slots which intensify the suction are connected to the critical areas by means of ejection nozzles.
  • the vacuum effect is limited by arranging a controlled leakage flow or vacuum reduction flows implemented with limited counterblow. In this manner, according to the publication, a vacuum effect greater than before is concentrated to the adjacency of the support rolls of the fabric and to the edge areas of the web.
  • the operation of the presented felt suction box is influenced by sealing arranged completely with blowing, where the sealing also provides air to the transverse central area of the web, from where air then needs to be removed in addition to the flow of normal leakage air, in other words there is double effort when the same air is first blown and then sucked.
  • the structure of felts is also considerably denser than that of drying wires, and felts carry significant amounts of water with them, so their contact with the suction box does not cause immediately as great friction forces as in drying wires, when impingement blowing also presses the wire towards the suction box and heats the web and wire.
  • Forming sections and press sections generally include suction boxes which touch the wet wire or felt and which have a hardened and water-lubricated surface structure.
  • the edge of the web becomes loose from the wire at the gap which closes in the machine direction, at the edge areas of the gap which is formed between the wire and roll, when the web comes to the suction roll, such as to a vac roll or groove roll.
  • the edge area of the closing gap refers to that part of the closing gap which is in cross-machine direction (CD) at the edge of the gap, where the edge of the wire or web or web wire travels in the machine direction.
  • a small vacuum in the edge area also complicates tail threading and may cause for example folds in the web wire. Furthermore, a small vacuum in the edge area is harmful in view of edge trimming (width) of the web and control of impingement blowing. Another weakness in prior art technology is that it is difficult to adjust the location or width or intensity of the area of the vacuum effect in the edge area. These problems are highlighted and accentuated as the running speed of the web wire increases.
  • One of the goals of the present invention is to eliminate or at least essentially reduce the problems and weaknesses of prior art solutions.
  • Another goal of the present invention is to accomplish a new and inventive runnability device for achieving improved runnability of the web in a material web machine.
  • a third goal of the present invention is to ensure that the web remains in contact with the wire which supports the web.
  • a fourth goal of the invention is to reduce the deflection of the web wire and hence to even out deviations in the CD drying profile.
  • a fifth goal of the invention is to reduce runnability problems and hence to enable increased web running speeds.
  • a sixth specific goal of the present invention is to improve opportunities to adjust the location, width and/or intensity of the area of the vacuum effect in the edge area.
  • the goals of the present invention can be accomplished by means of a runnability device according to the invention in order to achieve improved runnability of the web in a material web machine, when the web travels in the machine direction supported by a wire into a closing gap between a roll and the wire, where the runnability device is typically a runnability box, for example a suction box, which is located on the side of the wire before the said roll and extends essentially over the width of the web so that there is a slot between the wire and the runnability device, and where the runnability device comprises devices for directing a vacuum from the side of the wire over the width of the web wire and/or over the width of the closing gap in the cross-machine direction so that the vacuum in the edge area of the web wire and/or in the edge area of the closing gap is higher than in the central area of the web wire, for example so that the runnability device comprises a vacuum device which accomplishes a vacuum effect and which is adjustable in the cross-machine direction.
  • the runnability device comprises
  • the vacuum device of the runnability device is adjustable in the cross-machine direction by means of seals or a seal package.
  • the sealing device can be composed of a labyrinth seal package which comprises at least two labyrinth seals located at a distance from each other, where the essentially straight counter faces of the labyrinth seals border between them a suction slot, the cross-section of which is essentially a parallelepipedon.
  • the vacuum effect is created by a direct suction to the edge area of the web wire and/or of the closing gap from the side of the wire through the labyrinth seal package, and by the boundary-layer flow of air traveling with the web wire into the sealing device, and by a potential vacuum inside the runnability box, with the suction slot being open to the inside of the runnability box.
  • the advantages of a labyrinth seal package include for example that a sufficient vacuum effect is achieved while at the same time the seal package is simple and economical.
  • the sealing device can be composed of an edge nozzle which employs the ejection principle, where the edge nozzle is made up of two wall sections located at a distance from each other and where the wall sections have shaped counter faces, which are directed towards each other and which border between them an air blow slot, which forms an edge nozzle operating according to the ejection principle.
  • the vacuum effect is created by ejection blowing to the edge area of the web and/or of the closing gap in the ejection blow slot and by the air flow with the web wire over the blow slot and, when also using a suction slot, by a potential vacuum inside the runnability device, with the suction slot being open to the inside of the runnability device.
  • the advantage of the nozzle device is that a great vacuum effect can be achieved even with a small air flow.
  • the vacuum effect can be adjusted for example by adjusting the blow flow and/or separate suction flow.
  • the sealing device can be adjusted in the cross-machine direction for example as follows:
  • the sealing device which can be adjusted in the cross-machine direction, be dimensioned and positioned so that it does not touch the web wire, which may deflect towards the runnability device by the effect of vacuum.
  • the sealing device may be flexible in the direction of deflection of the web wire and/or potentially such that it wears at its contact locations to correspond to the shape of the deflecting wire.
  • One preferred material for the sealing device is for example polytetrafluoroethylene such as sold under the trademark Teflon®.
  • the edge of the web remains in contact with the wire also during impingement blowing, that the shrinkage of the web is reduced, and that the deflection of the wire is reduced and the wire remains smoother.
  • the wire support rolls which are for example vac rolls with vacuum throughout their surface, can be equipped with intensified vacuum forming in the edge area.
  • the vac rolls can be provided for example with denser grooving or denser suction holes in its edge areas.
  • the vac rolls can be provided with separate suction chambers in the edge areas so that a greater vacuum is formed.
  • FIG. 1 presents generally a runnability device according to the invention in the drying unit of a paper machine.
  • FIG. 2 presents a cross-section of an embodiment example of the runnability box according to the embodiment presented in FIG. 1 , with the cross-section running along line A-A in FIG. 1 .
  • FIG. 3 presents a cross-section of another embodiment example of the runnability box according to the embodiment presented in FIG. 1 , with the cross-section running along line A-A in FIG. 1 .
  • FIG. 4 presents two examples of the use of labyrinth seals and blow seals.
  • FIG. 5 presents a partial section view of the wire and web, seen from the top.
  • FIG. 6 presents a partial section view of the wire and web send from the side.
  • the paper machine presented in FIG. 1 includes the forming section A, press section B, and dryer section C.
  • the first cycle 1 and the second cycle 2 as well as the third cycle 3 are felt cycles
  • the fourth cycle 4 in the press section is usually a transfer belt, but the cycle 4 can also be composed of a felt.
  • the dryer section C includes the fifth cycle 5 , which is a so-called transfer wire cycle, and the sixth cycle 6 , which is typically a drying wire cycle.
  • transfer wire cycle which is a so-called transfer wire cycle
  • 6 which is typically a drying wire cycle.
  • other types of forming and press sections are suited in conjunction with the present invention.
  • the first fabric cycle 1 and the second fabric cycle 2 in the press section B are partly against each other so that the fabric cycles support the web W continuously on at least one side.
  • the third fabric cycle 3 and the fourth fabric cycle 4 in the press section are located on both sides of the web W, and they can be, as is illustrated in FIG. 1 , also against each other partly so that the web travels supported by at least one of these fabrics.
  • the transfer wire cycle 5 in the dryer section C supports the web from above and the wire 61 of the drying wire cycle 6 supports the web from beneath.
  • an impingement blowing hood 71 is arranged at the drying wire cycle 6 , with the impingement blowing hood 71 arranged above the web W which travels supported by the wire 61 of the drying wire cycle.
  • the web W travels to the next impingement blowing section 8 , where the web W first travels downwards past the first impingement blowing hood 81 of the impingement blowing section and then upwards past the second impingement blowing hood 82 of the impingement blowing section.
  • Runnability device 10 is used for achieving improved runnability of the web, when the web travels in the dryer section C in the support distance 64 between the first roll 62 and the second roll 63 following the first roll, supported by the wire 61 of the drying wire cycle 6 , into the closing gap 65 between the second roll 63 and the wire 61 in the machine direction.
  • the runnability device is typically a runnability box, such as a suction box, which is located on the inner cycle of the wire 61 of the drying wire cycle 6 before the second roll 63 and extends essentially over the width of the web W so that there is a slot between the wire 61 of the drying wire cycle 6 and the runnability device 10 .
  • the runnability device comprises vacuum devices 11 , 12 , preferably suction devices or blow devices, for directing the vacuum from the side of the wire of the drying wire cycle in the cross-machine direction over the width of the web wire W, 61 , which comprises the web W and the wire 61 of the drying wire cycle, and/or over the width of the closing gap 65 .
  • FIG. 2 presents a cross-section of an embodiment example of the runnability box according to the embodiment presented in FIG. 1 , with the cross-section running along line A-A in FIG. 1 . Due to the directed vacuum, the vacuum in the edge area E of the web wire and/or in the edge area 64 of the closing gap 65 is higher than in the central area of the web wire W, 61 and/or of the closing gap 65 .
  • the runnability device 10 comprises a vacuum device 11 , 12 , which accomplishes a vacuum effect, with the vacuum device 11 , 12 being adjustable in the cross-machine direction.
  • the vacuum devices 11 , 12 in the runnability box 10 are limited by a seal package which can be adjusted in the cross-machine direction.
  • a seal package can be for example a labyrinth seal package 111 , 112 , which comprises at least two labyrinth seals arranged at a distance from each other.
  • the vacuum slot 13 a connects to a source of vacuum V 1 and connects the source of vacuum to the edge areas of the wire 61 .
  • a source of vacuum V 2 is connected to the central region of the wire 61 .
  • the shape of the cross-sectional profile of the suction slot 13 a is a hyperbola, with one of the following counter faces in the direction of air flow:
  • the vacuum effect in the edge area E of the web wire W, 61 and/or in the edge area 64 (see FIG. 1 ) of the closing gap 65 (see FIG. 1 ) is accomplished by a direct suction from the side of the wire 61 of the drying wire cycle 6 from between the labyrinth seal packages 111 , 112 .
  • the air flow from between the labyrinth seal packages can also be influenced significantly by the boundary-layer flow of air traveling on the side of the wire of the drying wire cycle of the web wire W, 61 to the inner side of the labyrinth seal package and by a potential vacuum inside the runnability box 10 , into which the sealing accomplished with the labyrinth seal package is open.
  • FIG. 3 presents a cross-section of another embodiment example of the runnability box according to the embodiment presented in FIG. 1 , with the cross-section running along line A-A in FIG. 1 .
  • the sealing device in the runnability box 10 is composed of a nozzle device 12 , which is an edge nozzle employing the ejection principle and which is arranged to operate together with the flow-restricting strip 14 .
  • Such an edge nozzle 12 according to FIG. 3 is made up of two wall sections 121 , 122 located at a distance from each other, where the wall sections 121 , 122 have shaped counter faces, which are directed towards each other and which border between them a blow slot 13 b employing the ejection principle, with the blow slot 13 b comprising the following in order to accomplish an ejection effect in the direction of air flow:
  • the vacuum device 12 in the runnability box is a blow slot employing the ejection principle
  • the vacuum is accomplished in the edge area E of the web wire W, 61 and/or in the edge area 64 of the closing gap 65 :
  • FIG. 4 presents two examples of the use of labyrinth seals 111 , 112 and blow seals 12 .
  • the labyrinth seal can restrict the air flowing from the central area of the web wire to the edge areas more efficiently than the flow-restricting strip ( 14 , cf. FIG. 3 ), in other words the deflection in the central area of the wire can be reduced, because the vacuum remains smaller.
  • a higher vacuum can be directed to the edge area.
  • a higher and more precisely directed vacuum is needed at the tail end.
  • blow sealing 4 comprising a separate suction slot 13 a , produces a high vacuum also in locations where the blow sealing does not extend over the entire distance sealed.
  • the blow sealing can be replaced for example with a mechanical seal, which closes the gap between the roll and wire from a cross-directional flow.
  • FIGS. 5 and 6 present a partial section view of the wire and web, seen from the top and side, in other words the top view and side view.
  • the arrows in FIGS. 5 and 6 illustrate the outgoing flow from the blow seals, with this flow following the coanda surface further down and turning away from the wire level as shown in the side view. Lateral seals describe the possibility to move them independently.
  • gap blowing is illustrated with arrows, which illustrate a more intense blow effect in the closing gap and a blow effect in the opening gap, which blow effect can be/is adjusted smaller.
  • the opening gap can also be sealed mechanically.
  • the shadowing illustrates the various types of vacuums affecting the edge areas and central area of the web wire, with the control options of these vacuums being essentially improved by means of the present invention.
  • the sealing device can be adjusted in the cross-machine direction in many different ways.
  • the vacuum device 11 , 12 can be moved on the side of the wire 61 of the drying wire cycle 6 to an optional distance from the edge of the web wire W, 61 , whereby the location of the vacuum effect in the edge area E of the web wire and/or in the edge area 64 of the closing gap can be adjusted.
  • the intensity of the vacuum effect can be adjusted in the cross-machine direction in the edge area of the web wire.
  • the cross-directional angle of the sealing devices may prevent the formation of a boundary layer in the edge area of the closing gap.
  • the sealing device which can be adjusted in the cross-machine direction does not touch the web wire W, 61 so that friction resulting from the contact can be minimized between the moving wire 61 of the drying wire cycle 6 and the stationary sealing device 111 , 112 , 14 .
  • the sealing device is flexible in the direction of deflection of the web wire and/or potentially such that it wears at its contact locations to correspond to the shape of the wire of the drying wire cycle, with this wire deflecting to the web wire.
  • one recommended sealing device material is Teflon®.
  • the location of the runnability box is naturally not confined to the drying unit alone, but the present invention can be applied in any processing unit of a paper machine, or more generally, of a material web machine, where there is a need to ensure that the web remains in contact with the wire. It is also to be noted that instead of placing the runnability box in a single support distance in a processing unit or units of a material web machine, the runnability box can also be placed in several support distances (see for example FIG. 1 ). In general, it is advantageous but not necessary that the preferred application location of the present invention is in conjunction with impingement blowing, which is why the present invention can also be as such a solution to the problem of how to keep the web in contact with the wire.

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US11/736,963 2006-04-19 2007-04-18 Runnability of Web in a Material Web Machine Abandoned US20070245589A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20065241A FI123824B (sv) 2006-04-19 2006-04-19 Förbättrad körbarhet av en bana i en materialsbanamaskin
FI20065241 2006-04-19

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US11/736,963 Abandoned US20070245589A1 (en) 2006-04-19 2007-04-18 Runnability of Web in a Material Web Machine

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DE (1) DE102007018378A1 (sv)
FI (1) FI123824B (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110162230A1 (en) * 2006-01-30 2011-07-07 Metso Paper, Inc. Paper or Board Machine Employing a Single-Wire Draw Dryer Section

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009000507A1 (de) 2009-01-30 2010-08-05 Voith Patent Gmbh Vorrichtung zur Herstellung einer Materialbahn

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874997A (en) * 1973-03-21 1975-04-01 Valmet Oy Multiple cylinder drier in a paper machine
US4891891A (en) * 1988-10-11 1990-01-09 Beloit Corporation Dryer section apparatus and method
US5438765A (en) * 1991-11-05 1995-08-08 Valmet Paper Machinery Inc. Method and apparatus for eliminating the flutter of a paper web in the dryer section of a papermaking machine between two single felt configurations therein
US20020100186A1 (en) * 2001-01-30 2002-08-01 Remi Turcotte Device and method for ventilating an offset pocket space in a papermaking machine
US20030034139A1 (en) * 2001-08-20 2003-02-20 Voith Paper Patent Gmbh Apparatus for treating a fibrous web
US6848195B2 (en) * 2001-11-08 2005-02-01 Metso Paper, Inc. Blow box for controlling the web run
US6916404B2 (en) * 2000-10-27 2005-07-12 Metso Paper, Inc. Method and apparatus for web threading in a drying section of a paper machine or similar

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874997A (en) * 1973-03-21 1975-04-01 Valmet Oy Multiple cylinder drier in a paper machine
US4891891A (en) * 1988-10-11 1990-01-09 Beloit Corporation Dryer section apparatus and method
US5438765A (en) * 1991-11-05 1995-08-08 Valmet Paper Machinery Inc. Method and apparatus for eliminating the flutter of a paper web in the dryer section of a papermaking machine between two single felt configurations therein
US6916404B2 (en) * 2000-10-27 2005-07-12 Metso Paper, Inc. Method and apparatus for web threading in a drying section of a paper machine or similar
US20020100186A1 (en) * 2001-01-30 2002-08-01 Remi Turcotte Device and method for ventilating an offset pocket space in a papermaking machine
US20030034139A1 (en) * 2001-08-20 2003-02-20 Voith Paper Patent Gmbh Apparatus for treating a fibrous web
US6848195B2 (en) * 2001-11-08 2005-02-01 Metso Paper, Inc. Blow box for controlling the web run

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110162230A1 (en) * 2006-01-30 2011-07-07 Metso Paper, Inc. Paper or Board Machine Employing a Single-Wire Draw Dryer Section
US8444824B2 (en) * 2006-01-30 2013-05-21 Metso Paper, Inc. Paper or board machine employing a single-wire draw dryer section

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Publication number Publication date
FI20065241A0 (sv) 2006-04-19
FI20065241A (sv) 2007-10-20
FI123824B (sv) 2013-11-15
DE102007018378A1 (de) 2007-10-25

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Owner name: METSO PAPER, INC., FINLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LAAPOTTI, JORMA;LUMMILA, MARKKU;AALTONEN, RAMI;REEL/FRAME:019324/0755;SIGNING DATES FROM 20070423 TO 20070424

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION

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Effective date: 20131212