EP0780512A1 - Dispositif pour l'élimination de l'eau d'une bande fibreuse - Google Patents

Dispositif pour l'élimination de l'eau d'une bande fibreuse Download PDF

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Publication number
EP0780512A1
EP0780512A1 EP95120195A EP95120195A EP0780512A1 EP 0780512 A1 EP0780512 A1 EP 0780512A1 EP 95120195 A EP95120195 A EP 95120195A EP 95120195 A EP95120195 A EP 95120195A EP 0780512 A1 EP0780512 A1 EP 0780512A1
Authority
EP
European Patent Office
Prior art keywords
press
belt
press element
web
dewatering
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Withdrawn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
EP95120195A
Other languages
German (de)
English (en)
Inventor
Franz-Ferdinand Dipl.-Kfm. Kufferath
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.)
KUFFERATH FRANZ FERDINAND DIPL
Original Assignee
KUFFERATH FRANZ FERDINAND DIPL
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 KUFFERATH FRANZ FERDINAND DIPL filed Critical KUFFERATH FRANZ FERDINAND DIPL
Priority to EP95120195A priority Critical patent/EP0780512A1/fr
Publication of EP0780512A1 publication Critical patent/EP0780512A1/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Withdrawn legal-status Critical Current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
    • D21F3/0272—Wet presses in combination with suction or blowing devices
    • 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

Definitions

  • the invention relates to a device for dewatering a fibrous web, which has the features of the preamble of claim 1.
  • the two press elements are each designed as a roller.
  • the one of the two rollers on which the dewatering belt rests as it passes through the nip can be designed as a so-called suction roller, that is to say it has a perforated jacket and in its interior has a suction chamber which is aligned with the press nip.
  • suction roller that is to say it has a perforated jacket and in its interior has a suction chamber which is aligned with the press nip.
  • the invention has for its object to provide a device for dewatering a fibrous web, which has a dewatering performance even at high web speeds, which has well above the dewatering performance of the known wet presses in the wet press section of a paper machine. This object is achieved by a device having the features of claim 1.
  • the web along which the dewatering belt and the fibrous web move in the press nip and when exiting therefrom has a course which prevents the generation of centrifugal forces directed against the fibrous web. This is the case if the bearing surface of the first press element is flat or, viewed from the second press element, is concavely curved.
  • both press elements can be designed to be stationary and provided with water passage openings which extend to a suction chamber arranged on the side of the press element facing away from the fibrous web.
  • the fiber web is lying between two drainage belts through the Press nip moved through.
  • the two press elements can also be arranged next to one another. The fiber web is then passed through the nip in the vertical direction and dewatered in the horizontal direction.
  • a further, substantial increase in the dewatering performance can be achieved when using a multi-layer, dimensionally stable sieve fabric as a dewatering belt if the suction chamber is connected to an air conveying device which generates a strong air flow.
  • the major part of the water which was pressed out of the fibrous web during the passage through the press nip and was taken up by the dewatering belt, can then be transported from the latter through the through openings of the press element into the suction chamber
  • Drainage belt for the water to be absorbed has a low flow resistance and a sufficiently large storage capacity.
  • the water retention capacity can be relatively low.
  • a drainage belt with these properties can be easily realized with a multi-layer, dimensionally stable sieve fabric.
  • a press in the wet press section of a paper or cardboard machine has a roller 1 mounted in a press frame (not shown) with a horizontal axis of rotation, of which only part of the outer contour is shown in the figure.
  • This roller 1 has a drive, not shown, which rotates it in the direction of arrow 15, that is to say counterclockwise when looking in the direction of the figure, and a loading device, also not shown.
  • the other press element which interacts with the roller 1 and delimits the press nip is formed by a perforated plate 2 which is fixedly arranged in the press frame and has the same extent in the axial direction of the roller 1 as this. Such a fixed perforated plate would have to be provided instead of the roller 1 if drainage should take place on both sides.
  • the perforated plate 2 has a flat central zone between two edge zones which are convexly curved as seen from the roller 1.
  • the perforated plate 2 could also be formed in the area of the edge zone plane, so that the two edge zones would lie in the same plane as the central zone.
  • the perforated plate 2 could also be convexly curved, i.e. have a curvature like the casing of a conventional suction roll, because, because of the stationary arrangement of the perforated plate 2, such a curvature does not lead to the fact that in the holes 3 penetrating the perforated plate 2 there is a centrifugal force is exposed. It would even be possible to give the perforated plate 2 a concave curvature as seen from the roller 1, in which case the radius of curvature would then have to be chosen to be larger than that of the outer surface of the roller 1.
  • the perforated plate 2 With the surface facing the roller 1, the perforated plate 2 forms a support surface 4 for an endless drainage belt, designated as a whole by 5, which rotates in a self-contained path, which is defined by rollers, one of which is first driven, around the drainage belt to transport at the required speed.
  • This dewatering belt could be a press felt, as is generally used in the wet presses of the wet press section of a paper or cardboard machine.
  • a much better drainage can be achieved by means of the drainage belt 5, which consists of at least a lower layer 6 of a dimensionally stable sieve fabric and an upper layer 7 of a likewise dimensionally stable sieve fabric, the two layers 6 and 7 being connected to one another by binding threads.
  • All layers consist exclusively of monofilament threads and have maximum shape stability, ie they are incompressible within the reachable.
  • the open volume of the lower layer 6 is chosen so large that all the water that is pressed out of a fiber web 8 carried by the dewatering belt 5 in the press nip can be taken up.
  • the lower layer 6 is therefore formed by a relatively coarse fabric.
  • the upper layer 7, on the other hand, is designed as a finer fabric in order to prevent the fiber web 8 from receiving markings or annoying markings.
  • the permeability of the upper layer 7 for the water squeezed out of the fibrous web is, however, so great that the passage into the lower layer 6 is not or not significantly hindered.
  • the drainage belt 5 In addition to the high permeability of the drainage belt 5 for water in the direction towards the underside of the support surface 4, which increases from layer to layer in this direction, the drainage belt 5 has a high air permeability in its direction of movement and against its direction of movement. This is achieved through longitudinal channels formed by threads floating in the longitudinal direction.
  • a suction box 9 connects to the underside of the perforated plate 2 facing away from the roll 1 and extends over the entire length of the perforated plate 2 in the axial direction of the roll 1.
  • This suction box 9 contains a water separator, not shown, from which the the water separated from the air reaches a water outlet 10.
  • the suction box 9, in the exemplary embodiment via a channel 11, is connected to a blower 12 which is driven by a motor 13 and is able to generate a large volume air flow, largely irrespective of the negative pressure prevailing in the suction box 9.
  • the device according to the invention even allows the pressure exerted on the fiber web in the nip to be selected less than in the known high-performance wet presses, which also contributes to the fact that the width, measured in the running direction, of the zone in which pressure is exerted on the fiber web 6 compared to that Presses can be enlarged in which the press gap is limited by two rollers.
  • the contact surface 4 can be subjected to a suitable surface treatment.
  • the friction need not be reduced exclusively by such measures, because the water emerging from the drainage belt 5 to the perforated plate forms a lubricating film which significantly reduces the friction.

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  • Paper (AREA)
EP95120195A 1995-12-20 1995-12-20 Dispositif pour l'élimination de l'eau d'une bande fibreuse Withdrawn EP0780512A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95120195A EP0780512A1 (fr) 1995-12-20 1995-12-20 Dispositif pour l'élimination de l'eau d'une bande fibreuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95120195A EP0780512A1 (fr) 1995-12-20 1995-12-20 Dispositif pour l'élimination de l'eau d'une bande fibreuse

Publications (1)

Publication Number Publication Date
EP0780512A1 true EP0780512A1 (fr) 1997-06-25

Family

ID=8219904

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95120195A Withdrawn EP0780512A1 (fr) 1995-12-20 1995-12-20 Dispositif pour l'élimination de l'eau d'une bande fibreuse

Country Status (1)

Country Link
EP (1) EP0780512A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1532660A (en) * 1922-09-16 1925-04-07 Goodyear Tire & Rubber Machine for making fibrous composition
DE1005363B (de) * 1954-04-14 1957-03-28 Millspaugh Ltd Presswalzensatz fuer Papiermaschinen
DE1070490B (fr) * 1959-12-03
DE1461105A1 (de) * 1963-04-16 1968-12-19 Huyck Corp Verfahren und Vorrichtung zum Entfernen von Wasser aus einer feuchten Papierbahn
US3705079A (en) * 1971-02-18 1972-12-05 Huyck Corp Press fabric for a papermaking machine press section having selected large incompressible yarns
DE2323519A1 (de) * 1973-05-10 1974-11-21 Voith Gmbh J M Keilpresse zum kontinuierlichen entwaessern einer faserstoffbahn, insbesondere faserplattenbahn
EP0304561A1 (fr) * 1987-08-22 1989-03-01 Sulzer-Escher Wyss Gmbh Presse de déshydratation avec amenée de vapeur

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1070490B (fr) * 1959-12-03
US1532660A (en) * 1922-09-16 1925-04-07 Goodyear Tire & Rubber Machine for making fibrous composition
DE1005363B (de) * 1954-04-14 1957-03-28 Millspaugh Ltd Presswalzensatz fuer Papiermaschinen
DE1461105A1 (de) * 1963-04-16 1968-12-19 Huyck Corp Verfahren und Vorrichtung zum Entfernen von Wasser aus einer feuchten Papierbahn
US3705079A (en) * 1971-02-18 1972-12-05 Huyck Corp Press fabric for a papermaking machine press section having selected large incompressible yarns
DE2323519A1 (de) * 1973-05-10 1974-11-21 Voith Gmbh J M Keilpresse zum kontinuierlichen entwaessern einer faserstoffbahn, insbesondere faserplattenbahn
EP0304561A1 (fr) * 1987-08-22 1989-03-01 Sulzer-Escher Wyss Gmbh Presse de déshydratation avec amenée de vapeur

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