EP0389675A2 - Bande de pressage pour une installation de pressage - Google Patents

Bande de pressage pour une installation de pressage Download PDF

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Publication number
EP0389675A2
EP0389675A2 EP89120341A EP89120341A EP0389675A2 EP 0389675 A2 EP0389675 A2 EP 0389675A2 EP 89120341 A EP89120341 A EP 89120341A EP 89120341 A EP89120341 A EP 89120341A EP 0389675 A2 EP0389675 A2 EP 0389675A2
Authority
EP
European Patent Office
Prior art keywords
press
zone
press belt
hardness
width
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Withdrawn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
EP89120341A
Other languages
German (de)
English (en)
Other versions
EP0389675A3 (fr
Inventor
Christian Schiel
Werner Schön
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.)
F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Original Assignee
F Oberdorfer & Co KG Industriegewebe-Technik 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 F Oberdorfer & Co KG Industriegewebe-Technik GmbH filed Critical F Oberdorfer & Co KG Industriegewebe-Technik GmbH
Publication of EP0389675A2 publication Critical patent/EP0389675A2/fr
Publication of EP0389675A3 publication Critical patent/EP0389675A3/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Withdrawn legal-status Critical Current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
    • D21F3/0227—Belts or sleeves therefor
    • D21F3/0245—Means for fixing the sleeve to the roller end

Definitions

  • the invention relates to a press belt for a press device which is used for treating, in particular dewatering, a running material web, preferably a paper web.
  • a press device has two press elements (e.g. two press rolls or a press roll and a press shoe) which together form a press nip.
  • the material web to be treated runs through this press nip together with the press belt and optionally with one or two felt bands.
  • Various different pressing devices of this type are described in US Pat. No. 4,229,253 and in US Pat. No. 4,625,376. In all cases, the press belt is endless. Its length measured in the circumferential direction can vary.
  • the press belt If the press belt is relatively long in the direction of rotation, then it runs outside the press nip over guide rollers. If the press belt is relatively short in the circumferential direction, it forms a tubular press jacket which runs outside the press nip on an essentially circular path.
  • the press belt essentially consists of a plastic layer and a reinforcement embedded in it.
  • This reinforcement is made of reinforcing threads.
  • Various methods for producing the reinforcement are known. From US-PS 4,552,620 it is known to use a screen fabric as reinforcement. From WO 88/08897 it is known to use two layers of reinforcing threads lying one on top of the other as reinforcement.
  • the reinforcing threads extend in the longitudinal direction, i.e. from one edge of the press belt to the other edge.
  • the reinforcing threads extend essentially in the circumferential direction, more precisely: in the form of at least one helix.
  • the entire width of the press belt is composed of a central press zone, the width of which is substantially equal to the width of the material web, and two lateral edge zones.
  • the width of the reinforcement (again seen in cross section) is only approximately equal to the width of the press zone. This means that the edge zones have no reinforcement.
  • the aim is to achieve that the structure of the press belt in the press zone is different from the structure in the two peripheral zones.
  • the press belts produced by this simple process consequently have a completely uniform structure in principle. This results in the following difficulty:
  • the wear of the press belt during operation in the press facility To keep it low, an attempt is made to use the hardest possible material for the plastic layer. Because you want to ensure that the press belt in the press zone deforms as little as possible under the forces acting there. If, for example, the outside of the press belt is provided with grooves (for the temporary storage of press water), it should be avoided that the grooves are pressed together under the pressing pressure prevailing in the pressing zone. Another reason for using the hardest possible plastic material is that it should be avoided that the reinforcing threads of the reinforcing tape rub against one another in the press zone and are thereby destroyed prematurely.
  • a relatively hard plastic layer also has disadvantages: In many cases it is desirable that the two ends of the press belt (in particular if it is a tubular press jacket) are each attached to a supporting disk. In this way, the interior enclosed by the press jacket can be sealed to the outside at both ends.
  • a known method for attaching such a press jacket to said support disks is described in US Pat. No. 4,625,376. With this method, numerous cutouts are provided at each end of the press jacket, between which tongues remain. The edge zone is then formed inwards so that a sealing surface is created on the end face of the support disk. This method has proven itself; however, the harder the plastic layer, the more difficult it is to carry out.
  • the drawing shows a partial longitudinal section through a press roll with a press jacket according to the invention.
  • the press roller shown has a non-rotating support body 24, which is supported at its two ends (only one of which is visible) with a bearing pin 24a in a bearing block 25.
  • the support body On the outside, the support body has, in a known manner, a recess 24b in which a press shoe 26 is arranged, the length of which corresponds approximately to the width of the paper web to be treated.
  • An endless, tubular press jacket 10 runs around the support body 24 and the press shoe 26. By applying a pressure medium, the press shoe 26 can press the press jacket 10 against a counter-roller (omitted in the drawing).
  • a bearing ring 11 is axially displaceable, but not rotatable, on the journal 24a at each roller end.
  • a jacket support plate 12 is rotatably supported by means of a roller bearing 13.
  • On the outer end face of this jacket support disk 12 is the radially inwardly formed.
  • Edge zone of the press casing 10 is fastened by means of a clamping flange 15 and by means of screws 16.
  • the press jacket 10 consists essentially of a liquid-tight plastic, e.g. Polyurethane; it is preferably reinforced with a dimensionally stable carrier fabric, which is composed in a known manner from circumferential and longitudinal threads.
  • the outer end face of the jacket support disk 12 and the edge zone of the press jacket 10 together form a pair of sealing surfaces, the width of which is designated by B.
  • an annular groove and an O-sealing ring 23 can be provided in the jacket support disk.
  • the outer end face of the jacket support disk 12 lies in a plane normal to the axis; but it could also form a conical surface.
  • a shaft sealing ring 19 is provided, which rests in a housing ring 20 fastened to the casing support disk.
  • tongues 28 are formed with a hole. each of these tongues 28 is attached to a bolt 30. As a result, the end of the press jacket is stretched in the direction of the roll axis. A centering of the press casing 10 takes place in that the base of each cutout located between two tongues 28 bears against a sleeve 32.
  • the press casing Before assembly of the press casing 10, it has an elongated, approximately cylindrical basic shape. During assembly, the press jacket end is bent radially inwards around the rounded outer edge 12a of the jacket support disk 12. To facilitate this, the outer edge zone of the press casing is made of a relatively soft plastic. This outer edge zone extends from the ends (at 30) of the tongues 28 to approximately the point A, so that the spatially curved zone (at 12a) is enclosed therein. From point A to the edge of the press zone at point C, there is a transition zone in which the hardness of the plastic material increases the closer one approaches press shoe 26. In the middle area, which is preferably somewhat longer than the length of the press shoe 26, the sheath material has a high hardness.
  • the reinforcement (not shown in the drawing) of the press casing 10 extends uniformly through the entire press casing, that is to say along the entire press shoe 26 in the drawing, through the entire transition zone AC and from there to the end of the tongues 28 .

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  • Paper (AREA)
EP19890120341 1989-03-25 1989-11-03 Bande de pressage pour une installation de pressage Withdrawn EP0389675A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3909936 1989-03-25
DE19893909936 DE3909936A1 (de) 1989-03-25 1989-03-25 Verfahren und vorrichtung zum herstellen eines undurchlaessigen und biegsamen bandes oder schlauches

Publications (2)

Publication Number Publication Date
EP0389675A2 true EP0389675A2 (fr) 1990-10-03
EP0389675A3 EP0389675A3 (fr) 1991-02-27

Family

ID=6377260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890120341 Withdrawn EP0389675A3 (fr) 1989-03-25 1989-11-03 Bande de pressage pour une installation de pressage

Country Status (2)

Country Link
EP (1) EP0389675A3 (fr)
DE (1) DE3909936A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10139629A1 (de) * 2001-08-11 2003-02-20 Voith Paper Patent Gmbh Pressfilz
EP1643033A3 (fr) * 2004-10-02 2006-10-18 Voith Patent GmbH Dispositif de pressage d'une section de presse d'une machine de fabrication d'une bande fibreuse

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4411620C2 (de) * 1994-04-02 2001-05-31 Voith Sulzer Papiermasch Gmbh Preßmantel und Verfahren zur Herstellung eines Preßmantels
DE10158618A1 (de) * 2001-11-29 2003-06-12 Voith Paper Patent Gmbh Pressmantelspannung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4330023A (en) * 1980-08-18 1982-05-18 Beloit Corporation Extended nip press
DE8802213U1 (de) * 1988-02-20 1988-04-07 J.M. Voith Gmbh, 7920 Heidenheim Preßwalze zum Behandeln bahnförmigen Gutes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10139629A1 (de) * 2001-08-11 2003-02-20 Voith Paper Patent Gmbh Pressfilz
EP1643033A3 (fr) * 2004-10-02 2006-10-18 Voith Patent GmbH Dispositif de pressage d'une section de presse d'une machine de fabrication d'une bande fibreuse

Also Published As

Publication number Publication date
EP0389675A3 (fr) 1991-02-27
DE3909936A1 (de) 1990-09-27

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