EP0616073A1 - Dispositif pour le traitement d'une bande de matériau - Google Patents

Dispositif pour le traitement d'une bande de matériau Download PDF

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Publication number
EP0616073A1
EP0616073A1 EP94102798A EP94102798A EP0616073A1 EP 0616073 A1 EP0616073 A1 EP 0616073A1 EP 94102798 A EP94102798 A EP 94102798A EP 94102798 A EP94102798 A EP 94102798A EP 0616073 A1 EP0616073 A1 EP 0616073A1
Authority
EP
European Patent Office
Prior art keywords
layer
thickness
base layer
ceramic
roller
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.)
Granted
Application number
EP94102798A
Other languages
German (de)
English (en)
Other versions
EP0616073B1 (fr
Inventor
Heinz-Michael Dr. Zaoralek
Erich Vomhoff
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive 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 Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of EP0616073A1 publication Critical patent/EP0616073A1/fr
Application granted granted Critical
Publication of EP0616073B1 publication Critical patent/EP0616073B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • 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
    • D21F3/08—Pressure rolls

Definitions

  • the invention relates to a device for treating a material web, preferably for dewatering a paper web in the pulse drying process, with a heating roller and a counter bearing, which forms a press nip together with the heating roller, at least the heating roller having a fixed axis, a roller jacket and at least one bearing element for support of the roller shell on the axis and the roller shell contains a base layer and a thin ceramic heatable surface layer applied to the base layer.
  • the material web is passed through a device which has at least one press nip which is formed by a roller and a counter bearing arranged opposite the roller.
  • the counter bearing can be used both as a second roller and as a hydraulic shoe be trained.
  • the paper web which still contains a high proportion of water, passes through the press nip, the water being mechanically pressed out of the paper web between the roller and the counter-bearing.
  • An improvement in drainage is achieved in the prior art in that the roller is designed as a heating roller.
  • the aim of the device known from the prior art is to achieve the greatest possible drainage of the material web. It has proven to be disadvantageous here that the paper web, which is still not very strong, adheres to the press roll, which can result in the paper web being torn off. These production disturbances occur in particular due to an unsuitable surface condition of the roll shell.
  • a press roll for a generic device which has a working layer of its cylinder jacket, which is formed from a mixture of metal powder and a powder of inorganic material becomes.
  • This inorganic substance is a ceramic substance that can be produced, for example, by thermal spraying onto the roller body.
  • a pressure roller for a paper machine which contains an integrated construction of a metal core on which a metallic base layer and a ceramic working layer are applied, the base layer having an expansion coefficient between that of the metal core and the surface layer lies.
  • the ceramic layer has a permeability of 1 to 30%.
  • the ceramic layer has a thickness of 1 to 30mm. With a layer thickness of less than 1 mm, the detachment behavior was disturbed.
  • the heat loss of the aforementioned press roller can be limited internally by arranging an insulating layer, for example a ceramic layer, in the roller bore between the honeycomb wall and the bearing elements, the introduction of this layer is very complicated and structurally complex.
  • an insulating layer for example a ceramic layer
  • the invention has for its object to provide a device for treating a material web, preferably for dewatering a paper web in the pulse drying process, which avoids the disadvantages of the prior art described above and in particular improved energy efficiency and has improved mechanical stability.
  • the ceramic working layer has a thickness of less than 1 mm, that the base layer consists of ceramic material as thermal insulation, and that the base layer has a thickness that is greater than the thickness of the ceramic working layer.
  • An apparatus designed in this way has the advantage that the material web to be dewatered adheres to the roller surface to a much lesser extent and at the same time the dewatering of the material web, preferably the paper web, can be improved by a high temperature and a high pressure. It is particularly advantageous here that the thin ceramic working layer has a high temperature on its surface when heated externally, but has a low thermal conductivity, so that the roller shell made of metal is heated to a much lesser extent. At the same time, the different expansion of the ceramic working layer and the metallic roller shell is equalized by the thicker base layer made of ceramic material compared to the working layer, so that no tensile stresses arise in the ceramic working layer.
  • a simple manufacture of a heating roller for the device according to the invention is achieved according to a further feature of the invention in that the heat-insulating base layer is applied to the roller shell by means of water-stabilized plasma spraying.
  • the base layer has proven to be particularly advantageous here to apply the base layer with a thickness of 5 to 30 mm to the roll shell. This avoids tensile stress in the working shift.
  • the base layer has a thickness of 8 to 10 mm, preferably about 9.5 mm.
  • Such a base layer can be produced inexpensively by using Al 203.
  • the ceramic working layer it is particularly advantageous if it consists of zirconium oxide and has a thickness of 0.5 mm.
  • This ceramic material has particularly suitable thermal conductivity values which enable an optimal temperature effect even with a layer thickness of 0.5 mm.
  • the roller jacket of the heating roller consists of hard cast shell, which has white iron in the outer region and gray iron in the inner region.
  • This is a cast iron which, due to its special alloy and casting technology, is white iron with a high hardness between 450 and 600 HV, a high modulus of elasticity of approx. 180,000 N-mm2 and a poor thermal conductivity of approx. 20 W / mK arises.
  • a roll shell designed in this way has the advantage that it has a good support effect and thus good mechanical properties and at the same time acts as a thermal barrier.
  • the thickness of the layer in which the iron is white can be influenced. It has proven to be particularly advantageous if the white iron has a layer thickness of 20 to 80 mm. The low coefficient of expansion of white iron has a favorable effect on the thermal stress distribution within the roll shell.
  • the heating roller is preferably heated from the outside.
  • the ceramic working layer is heated up quickly and large heat losses are avoided.
  • a device designed with this feature then has the advantage that the ceramic working layer according to a further feature of the invention can be heated by induction of eddy currents into the working layer.
  • an electrically conductive layer is located directly below the working layer.
  • the reference numeral 1 for treating a material web, preferably for dewatering a paper web 2 in the pulse drying process, has a heating roller 3 and a hydraulic shoe roller 4 serving as a counterbearing, which together with the heating blade 3 has a press nip 5 forms.
  • the counter roller 4 can also be replaced by a hydraulic shoe.
  • the heating roller 3 is mounted in the usual way as a tube rotatable about its longitudinal axis.
  • the heating roller 3 can be supported hydrostatically as well as hydrodynamically on the continuous fixed axis 6.
  • the counter roller 4 is a shoe roller and is also hydrostatically or hydrodynamically supported (14).
  • an external heater 8 is provided, which is designed, for example, as an induction heater, which couples electromagnetic energy into the material of the roller shell 7 of the heating roller 3 and thus causes an increase in temperature, in particular on the work surface.
  • FIGS. 3 and 4 The structural design of the heating roller 3 is shown in detail in FIGS. 3 and 4.
  • a coating is applied to the roll shell 7.
  • This coating consists of an insulating base layer 9, a ceramic working layer 10 and an electrically conductive layer 11 which is arranged between the base layer 9 and the working layer 10 and which consists of a metal powder.
  • the layer 11 enables the working layer 10 to be heated up in a simple manner by induction of eddy currents into the layer 11.
  • the ceramic working layer 10 has a thickness of approximately 0.5 mm and consists of zirconium oxide.
  • the base layer 9 consisting of Al 203 has a layer thickness of approximately 9.5 mm and is applied to the roll shell 7 by means of water-stabilized plasma spraying.
  • the layer 11 of metal powder arranged between the base layer 9 and the working layer 10 has a thickness which is less than the thickness of the working layer 10 and is approximately 0.4 mm. It is also possible to integrate the layer 11 into the working layer 10.
  • the wadding jacket 7 of the heating roller 3 consists of chilled cast iron.
  • This is a cast iron which, due to a special alloy and casting technique, occurs in the outer area 12 as so-called white iron and in the inner area 13 as so-called gray iron.
  • the white iron arranged in the outer region 12 has a high hardness between 450 and 600 HV, a high modulus of elasticity of approximately 180,000 M / mm2 and a poor thermal conductivity of approximately 20 W / nK.
  • a roll shell constructed in this way has high mechanical strength and acts as a thermal barrier.
  • the layer thickness of the white iron in the outer region 12 is approximately 30 mm, and the layer thickness of the gray iron arranged in the inner region 13 is approximately 110 mm, so that the diameter of the roll shell 7 without the base layer 9 and the working layer 10 is approximately 140 mm and with the base layer 9 and the working layer 10 is approximately 150 mm.
  • the thermal expansion of all the lower layers bearing the working layer 10, namely the base layer 9 and the regions 12, 13 of the roll shell 7, is of the same order of magnitude and, in addition, less than that of the working layer 10.
  • the working layer 10 is thus located during operation a compressive bias, which is beneficial to the Life of the work shift affects.

Landscapes

  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
EP94102798A 1993-03-10 1994-02-24 Dispositif pour le traitement d'une bande de matériau Expired - Lifetime EP0616073B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4307592A DE4307592A1 (de) 1993-03-10 1993-03-10 Vorrichtung zur Behandlung einer Materialbahn
DE4307592 1993-03-10

Publications (2)

Publication Number Publication Date
EP0616073A1 true EP0616073A1 (fr) 1994-09-21
EP0616073B1 EP0616073B1 (fr) 1997-01-02

Family

ID=6482443

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102798A Expired - Lifetime EP0616073B1 (fr) 1993-03-10 1994-02-24 Dispositif pour le traitement d'une bande de matériau

Country Status (5)

Country Link
EP (1) EP0616073B1 (fr)
AT (1) ATE147111T1 (fr)
CA (1) CA2118660A1 (fr)
DE (1) DE4307592A1 (fr)
FI (1) FI941113A (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6006442A (en) * 1996-09-25 1999-12-28 Institute Of Paper Science And Technology, Inc. Methods for dewatering solid-liquid matrices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337973A2 (fr) * 1988-04-13 1989-10-18 Valmet Paper Machinery Inc. Procédé et dispositif de traitement par pression d'une bande de papier
EP0369968A2 (fr) * 1988-11-15 1990-05-23 Valmet Paper Machinery Inc. Dispositif dans une machine à papier
WO1991013204A1 (fr) * 1990-02-22 1991-09-05 Tampella Papertech Oy Cylindre de presse pour machine a papier

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE103677C (fr) *
FI70273C (fi) * 1985-01-09 1986-09-15 Valmet Oy Syntetisk pressvals och foerfaranden foer framstaellning av dena
DE3662409D1 (en) * 1985-04-30 1989-04-20 Yamauchi Corp Press roll for paper machines
CH667285A5 (de) * 1986-02-14 1988-09-30 Sulzer Ag Walze mit harter mantelflaeche.
CH674381A5 (fr) * 1988-04-13 1990-05-31 Sulzer Ag
EP0481321B1 (fr) * 1990-10-08 1996-05-22 Yamauchi Corporation Rouleau presseur pour machines à fabriquer le papier

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0337973A2 (fr) * 1988-04-13 1989-10-18 Valmet Paper Machinery Inc. Procédé et dispositif de traitement par pression d'une bande de papier
EP0369968A2 (fr) * 1988-11-15 1990-05-23 Valmet Paper Machinery Inc. Dispositif dans une machine à papier
WO1991013204A1 (fr) * 1990-02-22 1991-09-05 Tampella Papertech Oy Cylindre de presse pour machine a papier

Also Published As

Publication number Publication date
FI941113A0 (fi) 1994-03-09
FI941113A (fi) 1994-09-11
DE4307592A1 (de) 1994-09-15
CA2118660A1 (fr) 1994-09-11
ATE147111T1 (de) 1997-01-15
EP0616073B1 (fr) 1997-01-02

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