EP1602781A1 - Presse à patin - Google Patents

Presse à patin Download PDF

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Publication number
EP1602781A1
EP1602781A1 EP05102106A EP05102106A EP1602781A1 EP 1602781 A1 EP1602781 A1 EP 1602781A1 EP 05102106 A EP05102106 A EP 05102106A EP 05102106 A EP05102106 A EP 05102106A EP 1602781 A1 EP1602781 A1 EP 1602781A1
Authority
EP
European Patent Office
Prior art keywords
shoe
press
press shoe
web
shoe press
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Withdrawn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
EP05102106A
Other languages
German (de)
English (en)
Inventor
Andreas SCHÜTTE
Dr. Jens MÜLLER
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 Paper 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 Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1602781A1 publication Critical patent/EP1602781A1/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Withdrawn legal-status Critical Current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

Definitions

  • the invention relates to a shoe press for the treatment of a material web especially in a paper machine, in a calender, in a calender or The like with a arranged in a roll shell press shoe.
  • the material web is used to treat it through a gap created by the Shoe press and formed against the shoe press pressing counter-element is passed through.
  • the shoe press for drainage of the web runs at least one press felt through the Gap.
  • the press shoe presses against the inside of the roller Roll shell, so that the material web and the at least one press felt against the counter element are pressed. Since the roll shell due to the Rotary movement of the roller relative to the pressing against the roll shell Press shoe moves, arises between the roll shell and the press shoe one Sliding friction, which particularly warms the press shoe. Of the Press shoe heats up only at its with the roll shell in contact coming surface, whereas the opposite surface of the Press shoe not heated.
  • step due to the deformation of the press shoe different moisture contents along the Width of the web on.
  • the deformation of the press shoe leads in the use of Shoe press in a calender for a different smoothness of the web along its width.
  • a shoe press which comprises a press shoe having, between its coming into contact with the roll shell Surface and the opposite surface with a thermal Insulating layer is provided.
  • the insulating layer is the undesirable deformation reduces the pressure shoe, the quality of the material web along its width not yet sufficiently ensured.
  • Paper machines with web speeds of over 1200 meters per minute occur despite the insulating layer quality fluctuations along the width of the Material web on. In webs with low surface masses are the quality losses due to the deformation of the press shoe particularly serious.
  • the invention has the object of a shoe press of the type mentioned to improve that the deformation of the press shoe significantly reduced becomes.
  • the invention solves the problem with a shoe press to treat a Material web, in particular in a paper machine, in a calender, in one Glättwerk or the like with a arranged in a roll shell Press shoe, according to the invention, the press shoe is made of a material, this has a very small thermal expansion coefficient and / or a very high one Having dieitkostoryen.
  • the shoe press according to the invention gives good results in negative cambered counter rolls, which have a roll diameter of less than eight Meters, as well as in drying cylinders with a roll diameter of less than 2.5 meters and calender rolls with a roll diameter of less than two meters.
  • the material from which the press shoe is made can be a fiber reinforced Be plastic. Fiber-reinforced plastics have due to their fiber filling low thermal expansion coefficient. As reinforcing fibers come because of their good temperature resistance both carbon fibers and glass fibers in Question.
  • the fibers in the plastic can have a have preferred orientation.
  • the thermal expansion of the press shoe is in Least the longitudinal direction of the fibers and transverse to the fiber longitudinal direction at highest.
  • the press shoe from a Aluminum alloy to manufacture.
  • Aluminum has a high coefficient of thermal conductivity, so that the temperature differences in the press shoe are compensated quickly which allows the undesirable deformation of the press shoe to a minimum is reduced.
  • the press shoe both solid as well as in his Interior to be provided with chambers.
  • the press shoe out of the fiber reinforced Plastic is massively manufactured, becomes anisotropic by the alignment of the fibers Thermal expansion coefficient generated. So it is possible, for example, the fibers in the production of the press shoe so that the Thermal expansion coefficient in the longitudinal direction of the press shoe is very small and is larger transversely to the longitudinal direction of the press shoe. This way is also at high temperatures an optimal contact pressure of the press shoe against the interior the roll shell ensured in the longitudinal direction.
  • the arrangement of chambers in the press shoe can also on constructive manner achieves anisotropy of the coefficient of thermal expansion become.
  • the chambers are arranged in such a way that the press shoe due to the heating in its longitudinal direction less deformed than transversely thereto.
  • the press shoe is made of a flexible material is made. It is particularly advantageous if the press shoe in his Longitudinally flexible, since it is then due to the heating modified contour of the mating element can easily adapt.
  • the material of the press shoe has a thermal expansion coefficient of at most 25 ⁇ 10 -6 1 / K.
  • the thermal expansion coefficient is 15 ⁇ 10 -6 1 / K.
  • the heat conduction coefficient of the press shoe material is preferably at least 60 W / m 2 K. In practice, however, a heat conduction coefficient of 150 W / m 2 K has proven to be very advantageous.
  • the shoe press shown in Figure 6 consists of a flexible roll shell 6, the via a press shoe 1 with concave pressing surface against a cylindrical Press roller 8 is pressed.
  • the press forces were thereby from a Pressing element 7 of the shoe press, which press shoe 1 to the press roller. 8 presses, generates.
  • an elongated press nip is formed by the concave pressing surface, which can be used for intensive but nevertheless gentle dewatering or smoothing of a material web 9.
  • the press shoe 1 shown in FIGS. 1 to 5 is made of a flexible plastic whose thermal expansion coefficient is less than 25 ⁇ 10 -6 1 / K.
  • polyurethane is suitable. This leads to a large reduction in the deformation of the press shoe 1 due to heating.
  • the press shoe 1 according to FIG. 1 contains glass fiber balls to increase the stability 2 and fibers 3, 4 in the web running direction 10 and transverse thereto.
  • the fibers 3 run exclusively transversely to the Web running direction 10 and thus reduce the extensibility of the press shoe across the Web running direction 10.
  • a press shoe 1 which has only fibers 4, which in Web running direction 10 and so the extensibility in the web running direction 10th Reduce.
  • the press shoe 1 shown in Figure 4 has only glass fiber balls 2 for reinforcement.
  • the embodiment shown in Figure 5 indicates the possibility of fibers 5 in to arrange an acute angle to the web running direction 10.
  • the orientation of the fibers 2, 3, 4, 5 should be according to the specific load of press shoe 1 in the shoe press. This depends essentially on the geometry, the dimensions and the pressing forces of the press arrangement.
  • the press shoe 1 according to Figure 7 consists of a metal with a high Thermal conductivity, here aluminum or an aluminum alloy. Because of the high Thermal conductivity equalize temperature differences in the press shoe 1 quickly which minimizes deformations thereof.
  • the press shoe 1 has two transverse to the running direction 10 chambers 11, 12.
  • Chambers 11, 12 are intended to improve the bending behavior of the press shoe 1.
  • the Chambers 11, 12 are also in press shoes 1 made of plastic advantageous.

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  • Paper (AREA)
EP05102106A 2004-05-29 2005-03-17 Presse à patin Withdrawn EP1602781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004026372 2004-05-29
DE200410026372 DE102004026372A1 (de) 2004-05-29 2004-05-29 Schuhpresse

Publications (1)

Publication Number Publication Date
EP1602781A1 true EP1602781A1 (fr) 2005-12-07

Family

ID=34939003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05102106A Withdrawn EP1602781A1 (fr) 2004-05-29 2005-03-17 Presse à patin

Country Status (2)

Country Link
EP (1) EP1602781A1 (fr)
DE (1) DE102004026372A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5925219A (en) * 1996-05-31 1999-07-20 Voith Sulzer Papiermaschinen Gmbh Shoe press with stop
EP1273703A1 (fr) * 2001-07-05 2003-01-08 Vaahto OY Méthode pour ajuster la position du sabot dans une presse à pince allongée et presse à pince allongée
EP1348804A1 (fr) * 2002-03-27 2003-10-01 Voith Paper Patent GmbH Patin de presse

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5925219A (en) * 1996-05-31 1999-07-20 Voith Sulzer Papiermaschinen Gmbh Shoe press with stop
EP1273703A1 (fr) * 2001-07-05 2003-01-08 Vaahto OY Méthode pour ajuster la position du sabot dans une presse à pince allongée et presse à pince allongée
EP1348804A1 (fr) * 2002-03-27 2003-10-01 Voith Paper Patent GmbH Patin de presse

Also Published As

Publication number Publication date
DE102004026372A1 (de) 2005-12-15

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