EP3992358A1 - Dispositif d'aspiration pour guider une bande fibreuse - Google Patents

Dispositif d'aspiration pour guider une bande fibreuse Download PDF

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Publication number
EP3992358A1
EP3992358A1 EP21200718.1A EP21200718A EP3992358A1 EP 3992358 A1 EP3992358 A1 EP 3992358A1 EP 21200718 A EP21200718 A EP 21200718A EP 3992358 A1 EP3992358 A1 EP 3992358A1
Authority
EP
European Patent Office
Prior art keywords
guide roller
suction
clothing
active surface
fibrous web
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Withdrawn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
EP21200718.1A
Other languages
German (de)
English (en)
Inventor
Hagen Kanstein
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 EP3992358A1 publication Critical patent/EP3992358A1/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Withdrawn legal-status Critical Current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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • 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
    • B65H20/00—Advancing webs
    • B65H20/02—Advancing webs by friction roller
    • 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
    • D21F3/10—Suction rolls, e.g. couch rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/10—Rollers
    • B65H2404/15—Roller assembly, particular roller arrangement
    • B65H2404/153—Arrangements of rollers facing a transport surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/31—Suction box; Suction chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/36—Means for producing, distributing or controlling suction
    • B65H2406/363—Means for producing, distributing or controlling suction adjusting or controlling distribution of vacuum for a plurality of suction means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/177—Fibrous or compressible material

Definitions

  • the invention relates to a suction device for safely guiding or transferring a fibrous web, such as in particular a glass fiber, nonwoven or paper web, comprising a first and a second guide roller, a suction box arranged between them, and a permeable fabric guided over the two guide rollers and the suction box.
  • the suction box has an active surface which is designed to exert a negative pressure on the clothing guided over the active surface and on the fibrous web transported thereon during normal operation.
  • FIG. 1 Further aspects of the present invention relate to a machine for producing or finishing a fibrous web with at least one such suction device and the use of such a suction device, the suction device comprising a further guide roller and a further suction box over which the clothing is guided and having a further active surface , which is designed to exert a negative pressure on the clothing guided over the additional active surface and on the fibrous web transported on it, and wherein the additional effective surface is arranged and dimensioned in such a way that it covers essentially the entire path that the clothing between the another guide roller and one of the two guide rollers of the first and second guide roller travels bridged.
  • Both guide rolls and suction boxes are regularly used, for example, in the forming section of a paper machine, so that such a combination is state-of-the-art, even if the suction boxes are usually only used to dehumidify the fibrous web and not to reliably guide or transfer it to have.
  • the arrangement of a suction box between two guide rolls, with the effective surface of the suction box being arranged and dimensioned in such a way that it essentially bridges the entire path covered by the clothing between the two guide rolls, is also out of the question, for example figure 2 the DE 10 2004 055 139 A1 and figure 1 the DE 29 22 623 A1 famous.
  • the transfer between different drive groups can be, for example, the transfer between the forming section and the press section of a paper machine, or the transfer from a felt of a first press assembly to the felt of a second press assembly within the press section.
  • Suction rolls with a very large open area are required in particular when the fibrous web comprises long fibers or is largely formed from them, for example in the case of very open papers or nonwovens or glass fiber webs. This requirement is based on the fact that the holes in the roll mantle of conventional suction rolls, which have only a relatively small open area, quickly become clogged with fibers.
  • suction rolls with a large open area that are suitable for the production or finishing of fibrous webs with long fibers, they have various disadvantages.
  • their structure is complex, since there are special requirements, for example, for sealing strips and spray pipes.
  • the user of such suction rollers should always have a reserve roller in the vicinity of the machine.
  • these rollers develop a noise level during operation that cannot be ignored. This is due to the fact that the vacuum in the holes in the roll shell collapses as soon as the same move out of the vacuumed zone of the suction roll.
  • suction rollers are sucked off by fans or water ring air pumps. A significant proportion of the suction volume flow is required in order to adapt the open area of the suction area to the negative pressure of the suction area. This makes the operation of these suction rolls energy-consuming and expensive.
  • a generic suction device is from figure 2 the DE 199 55 030 A1 famous.
  • a roll 14 which is part of a shoe press arrangement, and a suction roll 34 arranged side by side with a suction box 52 arranged therebetween.
  • Another suction roll 36 is arranged in the process direction behind the suction roll 34, but on a side of the roll 24 and the suction roll 34 opposite the clothing 22.
  • Another suction box 54 is located directly behind the suction roll 34, also on this opposite side.
  • the actual transfer of the fibrous web from the fabric 22 to a further fabric 28 takes place here again by means of a suction roll, namely the further suction roll 36, which entails the disadvantages mentioned above.
  • the generic suction device described at the outset is developed in such a way that the additional suction box is arranged between the first guide roller and the additional guide roller. With the two suction boxes located between the three rolls, it is clear that they are all located on the same side of the clothing.
  • the suction device comprises a further guide roller and a further suction box over which the clothing is guided, with the further suction box having a further active surface which is designed to apply a negative pressure to the clothing guided over the further active surface during normal operation and on the fibrous web transported thereon, and wherein the further active surface is arranged and dimensioned in such a way that it essentially bridges the entire path covered by the clothing between the further guide roller and one of the two guide rollers of the first and second guide roller. In this way it is possible to provide several zones of different pressure and/or to achieve gentler deflections.
  • the further suction box is designed, during normal operation, to exert a different, in particular stronger, negative pressure on the clothing and on the fibrous web transported on it than the negative pressure of the suction box between the first and second guide roller .
  • the fibrous web can first be removed from another clothing with the stronger vacuum against the clothing ("pick-up zone") and then transferred with a lower vacuum ("holding zone”).
  • a low negative pressure can be achieved, for example, by the fact that the negative pressure inside the suction box (for the "hold zone”) is already lower than the negative pressure inside the further suction box (for the "pick-up zone”) and/or with the same negative pressure in the two suction boxes due to a different open area on the two surfaces.
  • the axes of rotation of the first guide roller, the second guide roller and the further guide roller do not lie in a common plane.
  • they can be arranged on a cylinder surface. This enables all three rolls to be supported by a common support roll.
  • the respective effective surfaces are arranged and dimensioned in such a way that they essentially bridge the entire path that the clothing travels between the respective guide rollers.
  • the term "substantially” means that at least 70%, preferably at least 90%, more preferably at least 95% of the respective path is bridged.
  • the two guide rollers and the further guide roller ensure that the clothing with the fibrous web transported on it can be guided and deflected with little wear.
  • the rollers can be constructed in a very simple manner, which makes their purchase and operation cheap.
  • the rolls are not suctioned, so that a vacuum does not collapse in the holes in the roll shell, which enables low-noise operation.
  • the fibrous web is held on the permeable clothing by the negative pressure from the suction box.
  • the suction box can also have a very simple structure and is easy to clean to let. Since the function of guiding and deflection is primarily covered by the guide rollers, the wear between the active surface of the suction box and the clothing guided over this active surface can be kept very low.
  • the inventors have recognized that it is important in order to be able to effectively replace suction rolls with their disadvantages described above with the suction device according to the invention that the effective surface of the suction box extends essentially over the entire path between the two guide rolls. This is the only way to ensure that the suction or holding effect is already effective very close to the respective guide roller.
  • the suction box also has a first curved side wall adapted to the diameter of the first guide roll and/or a second side wall adapted to the diameter of the second Has adapted guide roller, curved side wall. Both side walls are preferably curved accordingly.
  • the suction box can have a connection on one of its two end faces between the two guide rollers, by means of which the suction box is or can be connected to a vacuum source.
  • the suction box can thus essentially consist of two side walls curved in accordance with the radii of the guide rollers, two end plates - namely on the guide and drive side - extending between the two guide rollers, of which at least one has a vacuum connection, a covering facing the clothing, which Defined active surface and is more or less open, and be formed a cover facing away from the fabric.
  • the suction box also includes at least one format slide, with which the width of the active surface can be adjusted to the width of the fibrous web or adjustable.
  • the suction box preferably comprises at least one format slide on each of its two side edges.
  • the suction device also includes a support roller, which is arranged on a side of the first and second guide roller, and possibly the further guide roller, facing away from the clothing and is in supportive contact with these guide rollers.
  • a support roller which is arranged on a side of the first and second guide roller, and possibly the further guide roller, facing away from the clothing and is in supportive contact with these guide rollers.
  • the guide rollers themselves can be designed to be relatively small and handy, but without the risk of them being impermissibly deformed by the forces that the deflected clothing acts on them.
  • the use of a common back-up roll presupposes that all the guide rolls supported by this back-up roll have essentially the same diameter.
  • the suction box can be constructed in a particularly simple manner if the active surface is essentially flat, so that the clothing and the fibrous web transported on it are guided in a straight line from the first guide roller to the second guide roller during normal operation. This also minimizes wear and tear caused by friction between the active surface and the covering.
  • the active surface may also be advantageous to design the active surface to be essentially curved, so that the clothing and the fibrous web transported on it are not guided in a straight line from the first guide roller to the second guide roller during normal operation.
  • the curvature should not be too pronounced anywhere, or the minimum radius of curvature that the active surface has should be selected sufficiently large to keep the wear during the deflection low.
  • the vacuumed area includes as large an open area as possible. It is therefore proposed that the effective area has an open area of between 20% and 100%, preferably between 50% and 100%, more preferably between 70% and 100%. In fact, in extreme cases, the open area can even be 100%, which means that the side of the suction box facing the clothing—apart from the format slides, if applicable—is essentially completely open.
  • a support structure for example by means of a A plurality of struts which are aligned parallel to one another and are spaced apart from one another and which preferably extend orthogonally to the direction of movement of the clothing in normal operation. Care should be taken to ensure that the material of the support structure is chosen so that the coefficient of sliding friction between the support structure and the covering is as low as possible.
  • the support structure can have a ceramic surface, for example.
  • a further aspect of the present invention relates to a machine for producing or finishing a fibrous web, such as in particular a glass fiber, nonwoven or paper web, comprising at least one suction device according to the invention as described above.
  • Another aspect of the present invention relates to the use of such a suction device for transferring, preferably in a closed train, a fibrous web, in particular one with long fibers, between two sections in a machine for producing or finishing the fibrous web or between two functional units of these sections.
  • the suction device according to the invention can make particularly good use of its advantages.
  • the suction device according to the invention with the additional guide roller and the additional suction box can be used as a replacement for a pick-up roller.
  • the active surface between the first guide roller and the second guide roller provides a holding zone, while the other active surface provides a pick-up zone, with the negative pressure exerted on the clothing and in the holding zone the fibrous web being transported on it is different from the vacuum that is exerted on the clothing and the fibrous web transported on it in the pick-up zone.
  • both suction boxes can be connected to the same vacuum source, but have coverings with different open areas.
  • FIG 1a a relatively simply constructed embodiment of a suction device 10 known from the prior art is shown schematically.
  • the suction device 10 comprises a first guide roller 12, a second guide roller 14 and a suction box 16 arranged between the two guide rollers 12, 14.
  • the suction device 10 also includes a permeable covering 18, which covers a peripheral section of the first guide roller 12, a here effective surface 20 of the suction box 16 indicated by dashed lines and a peripheral section of the second guide roller 14 is or is guided.
  • the fabric 18 is an endless circulating fabric, with in Figure 1a only a portion thereof is shown. At least in the area in which the clothing 18 is or is guided over the effective surface 20 of the suction box 16, a fibrous web (not shown here) can be transported on the clothing 18 on the side of the clothing 18 facing away from the effective surface 20 during normal operation. If the suction box 16 is connected during normal operation to a vacuum source, also not shown, for example via a connection on one of its end faces, the vacuum acts on the fabric 18 via the active surface and, since the fabric 18 is designed to be permeable, also through the fabric 18 through to the fibrous web. The latter is thus held securely on the covering 18 and guided with it over the area of the active surface 20 .
  • the active surface 20 is arranged and dimensioned in such a way that it covers essentially the entire path that the covering 18 has between the two Guide rollers 12 and 14 returns, bridged.
  • the suction box 16 can preferably have a first curved side wall adapted to the diameter of the first guide roller 12 and a second curved side wall adapted to the diameter of the second guide roller 14 .
  • the suction box 16 can comprise a cover opposite the active surface 20 and a front plate on the driver and drive side, wherein at least one of the two front plates preferably has a connection for the vacuum source, not shown.
  • the effective surface 20 of the suction box can have a relatively large open surface.
  • the active surface can in particular comprise a plurality of struts which are aligned parallel to one another and are spaced apart from one another and which preferably extend orthogonally to the direction of movement of the clothing in normal operation.
  • the open area can also be 100%, i.e. the suction box 16 can be essentially completely open towards the clothing 18 .
  • the suction box 16 can preferably also include format slides, which are not shown here, which are positioned in the cross-machine direction, ie orthogonally to the image planes Figure 1a , Be adjustable to match the width of the active surface 20 to the width of the fibrous web.
  • FIG Figure 1b shows a modification of the embodiment according to FIG Figure 1a .
  • the suction box 16 is designed in such a way that it can exert negative pressures of different strengths on the clothing and the fibrous web transported on it in two different zones.
  • one of these zones can serve as a so-called pick-up zone, whereas the other zone can function as a so-called stop zone.
  • the suction box can have a dividing wall on the inside, so that there are virtually two suction box sections 16.1 and 16.2 in which different negative pressures can prevail.
  • the active surface 20 can have two sections 20.1, 20.2, the open surfaces of which vary from one another.
  • FIG. 2 shows a first embodiment of a suction device 10' according to the invention. This is an extension of the suction device 10 according to the embodiment in FIG Figure 1a .
  • the same reference numerals are used for the same components and component sections as in FIG Figure 1a used and reference is made to the description above.
  • the first embodiment according to the invention figure 2 differs essentially in this from the embodiment according to FIG Figure 1a that, viewed in the direction of movement of the clothing 18 , a further guide roller 22 is provided in front of the first guide roller 12 and a further suction box 26 is provided between the further guide roller 22 and the first guide roller 12 .
  • the clothing 18 and the fibrous web transported on it are first transported over a peripheral section of the additional guide roller 22 and then over an additional effective surface 30 of the additional suction box 26 before they reach a peripheral section of the first guide roller 12.
  • All three guide rollers 12, 14 and 22 are preferably designed to be essentially identical to one another. As a result, a separate replacement roller does not have to be kept available for each guide roller.
  • the guide rollers 12, 14 and 22 also have a relatively simple structure and are not vacuumed. Their axes of rotation, indicated by crosses in the figures, preferably all lie on a common cylindrical surface.
  • the further suction box 26 can be constructed in exactly the same way as was described above for the suction box 16 . In the present exemplary embodiment, however, it differs from the suction box 16 in that it is narrower, since the distance between the further guide roller 22 and the first guide roller 12 is smaller than the distance between the first guide roller 12 and the second guide roller 14.
  • the further active surface 30 of the further suction box 26 is therefore shorter than the active surface 20 of the suction box 16.
  • the further active surface 30 can have a different open area than the active surface 20, so that the clothing 18 and the fibrous web transported on it different vacuums are applied in the two areas of the suction boxes 16 and 26, even if both suction boxes 16 and 26 are connected to the same vacuum source.
  • FIG 4 now shows schematically how a combination of embodiment 10 according to Figure 1a and according to the first embodiment 10' of the present invention figure 2 can be used to transfer a transfer device known from the prior art with a suction roller, as is shown in figure 3 is shown to replace.
  • a fibrous web (not shown) is pulled from a first covering 34 (from top left in figure 3 coming) to a second covering 36 (moving to the right in figure 3 technological) transferred.
  • the first clothing 34 is guided over a first deflection roller 38 that is not subjected to suction.
  • the second clothing 36 is guided over a second deflection roller 40 in the transfer area.
  • the second deflection roller 40 can be evacuated in sections in order to be able to reliably transfer the fibrous web to the second span 36.
  • the transfer device 32* In order to reliably transfer the fibrous web from the first skin 34 to the second skin 36, the transfer device 32* includes a suction roller 42.
  • the structure of the latter is relatively complicated.
  • a roller shell In order to also be able to transfer fibrous webs with long fibers, a roller shell requires a relatively large open area. Since these cannot be reached with bores or only with difficulty, suction rolls with casings in honeycomb geometry are used in practice, in particular triangular honeycombs or hexagonal honeycombs, which are welded or soldered together. Otherwise there is a risk that the suction openings will become clogged.
  • the suction roller 42 usually comprises at least two different suction zones, namely at least one pick-up zone, which is opposite the first deflection roller 38, and a holding zone, which is used to hold the fibrous web between the first deflecting roller 38 and the second deflecting roller 40.
  • figure 4 shows schematically how the complicated structure of the deflection roller 42 figure 3 by the inventive suction device 10 'according to the first embodiment figure 2 can be replaced.
  • figure 4 shows figure 4 , as well as the vacuumed second deflection roller 40 from figure 3 through the suction device 10 according to the embodiment Figure 1a can be replaced.
  • the suction devices 10 and 10' make it possible to provide a transfer device 32 for safely transferring, preferably in a closed train, the fibrous web from the first skin 34 to the second skin 36, which is free of suction rolls and the problems associated therewith.
  • the advantages of the present invention are particularly effective when the fibrous web to be transferred has long fibers or is largely formed from them.
  • the fibrous web is usually not really transferred in one closed train, but with a small gap of about 2 mm.
  • the transfer device 32 according to the invention figure 4 it is possible to actually transfer the fibrous web in a closed train, but it is alternatively also possible to transfer the fibrous web - as in the prior art - with a small gap.
  • the effective surface 30 of the additional suction box 26 has a different open surface than the effective surface 20 of the suction box 16 of the suction device 10', it is possible, even if both suction boxes 16 and 26 are connected to the same vacuum source, to have a different vacuum to apply the fibrous web transported on the clothing 18 in the area of the other suction box, compared to the negative pressure in the area of the suction box 16.
  • a pick-up zone with greater negative pressure and between the first clothing 34 and the second Upholstery 36 are set up a holding zone with lower vacuum.
  • the area in which the clothing 18 and the fibrous web transported on it are guided around a peripheral section of the first guide roller 12 of the suction device 10' without a negative pressure acting on it can be kept relatively small, since according to the invention the respective active surfaces 20, 30 are such are arranged and dimensioned so that they essentially bridge the entire path covered by the fabric 18 between the respective guide rollers 22, 12 and 14.
  • FIG figure 5 shows a second embodiment of a suction device 10" according to the invention. This is an extension of the suction device 10' according to the first embodiment according to the invention.
  • the same reference numbers are therefore used for the same components and component sections as in FIG figure 2 used and reference is made to the description above.
  • the second embodiment according to figure 3 differs essentially only in this from the first embodiment according to FIG figure 2 that a support roller 44 is additionally provided, which is arranged on a side of the first guide roller 12, the second guide roller 14 and the further guide roller 22 facing away from the clothing 18 and is in supporting contact with these guide rollers 12, 14 and 18.
  • said guide rollers 12, 14, 18 can be made relatively small and inexpensive, without the risk that they will sag unacceptably as a result of the forces that act on them from the deflected clothing 18.

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  • Treatment Of Fiber Materials (AREA)
EP21200718.1A 2020-10-28 2021-10-04 Dispositif d'aspiration pour guider une bande fibreuse Withdrawn EP3992358A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020128265.6A DE102020128265A1 (de) 2020-10-28 2020-10-28 Alternatives Saugwalzenkonzept

Publications (1)

Publication Number Publication Date
EP3992358A1 true EP3992358A1 (fr) 2022-05-04

Family

ID=78302666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21200718.1A Withdrawn EP3992358A1 (fr) 2020-10-28 2021-10-04 Dispositif d'aspiration pour guider une bande fibreuse

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Country Link
US (1) US20220127095A1 (fr)
EP (1) EP3992358A1 (fr)
DE (1) DE102020128265A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2922623A1 (de) 1978-06-09 1979-12-20 Dominion Eng Works Ltd Papierbahn-trenneinrichtung
US4361466A (en) * 1977-10-27 1982-11-30 Beloit Corporation Air impingement web drying method and apparatus
WO1997013031A1 (fr) * 1995-10-04 1997-04-10 Valmet Corporation Procede applicable dans une machine a papier et dispositif correspondant
DE19955030A1 (de) 1999-11-16 2001-05-17 Voith Paper Patent Gmbh Verfahren zum Überführen einer zu behandelnden Faserstoffbahn
DE10126325A1 (de) * 2000-05-31 2001-12-20 Metso Paper Inc Trockengruppe der Trockenpartie einer Papier- oder Kartonmaschine und Trockenpartie einer Papier- oder Kartonmaschine
DE102004055139A1 (de) 2004-11-16 2006-05-18 Voith Paper Patent Gmbh Dichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4361466A (en) * 1977-10-27 1982-11-30 Beloit Corporation Air impingement web drying method and apparatus
DE2922623A1 (de) 1978-06-09 1979-12-20 Dominion Eng Works Ltd Papierbahn-trenneinrichtung
WO1997013031A1 (fr) * 1995-10-04 1997-04-10 Valmet Corporation Procede applicable dans une machine a papier et dispositif correspondant
DE19955030A1 (de) 1999-11-16 2001-05-17 Voith Paper Patent Gmbh Verfahren zum Überführen einer zu behandelnden Faserstoffbahn
DE10126325A1 (de) * 2000-05-31 2001-12-20 Metso Paper Inc Trockengruppe der Trockenpartie einer Papier- oder Kartonmaschine und Trockenpartie einer Papier- oder Kartonmaschine
DE102004055139A1 (de) 2004-11-16 2006-05-18 Voith Paper Patent Gmbh Dichtung

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US20220127095A1 (en) 2022-04-28

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