WO2014029754A1 - Cylindre et procédé de fabrication d'un tel cylindre - Google Patents

Cylindre et procédé de fabrication d'un tel cylindre Download PDF

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Publication number
WO2014029754A1
WO2014029754A1 PCT/EP2013/067277 EP2013067277W WO2014029754A1 WO 2014029754 A1 WO2014029754 A1 WO 2014029754A1 EP 2013067277 W EP2013067277 W EP 2013067277W WO 2014029754 A1 WO2014029754 A1 WO 2014029754A1
Authority
WO
WIPO (PCT)
Prior art keywords
roll
roller
layer
producing
web
Prior art date
Application number
PCT/EP2013/067277
Other languages
German (de)
English (en)
Inventor
Stefan Pollaschek
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
Priority to EP13753151.3A priority Critical patent/EP2888402A1/fr
Priority to CN201380043751.5A priority patent/CN104583490A/zh
Priority to US14/422,724 priority patent/US20150211181A1/en
Publication of WO2014029754A1 publication Critical patent/WO2014029754A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0233—Soft rolls
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/49547—Assembling preformed components
    • Y10T29/49549—Work contacting surface element assembled to core

Definitions

  • the invention relates to a roller for use in a machine for producing and / or finishing a fibrous web such as a paper or board web according to the preamble of claim 1 and a method for producing such a roller according to the preamble of claim 13 or 14.
  • Rollers are used in paper machines in a variety of positions. Depending on the location or purpose of the respective roller, this has a roll cover, which shows properties that are tailored to the use.
  • so-called calenders or calenders which can either be subordinated to the actual fiber web production online in a paper machine or can also be used offline, usually rollers with covers made of a composite material are used.
  • rollers with covers made of a composite material are used.
  • juxtaposed paper or textile discs which were placed on a roll core and then pressed, were used.
  • Corresponding calender roll covers are known from a variety of publications.
  • DE 19928755 A1 discloses a roller, in particular for smoothing paper webs, which has a hard roll core, for example made of metal, which is provided on its outside with an elastic covering layer comprising an elastic matrix material which, in operation, is elastic in regions by a pressable counter roll is deformable.
  • the material and / or the structure of the elastic cover layer is chosen so that in a certain temperature range and at a certain nip frequency as well an amplitude of the surface of the elastic covering layer caused by the deformation is minimized, the total dissipated energy of the reference layer.
  • a roller is known in particular for smoothing paper webs with a hard roll core, for example made of metal, which is provided on its outside with an elastic cover layer consisting of an elastic matrix material and fillers embedded in the matrix material. At least some of the fillers are formed as metallic fillers, which are at least partially made of metal and wherein at least a portion of the metallic fillers may be formed as a metal foam.
  • a disadvantage of the known roller covers is primarily that takes place by the dissipation at high dynamic stress, the high temperature of the heating roller and the thermal insulating effect of the known references a strong heating of the same.
  • the maximum operating temperature is limited by the limitations of material resistance. It is thus necessary to cool the roller having the soft cover during operation. This is especially important for high performance calenders.
  • the heating of the heating roller and the cooling of the soft roller are associated with a high energy consumption.
  • rollers in other positions are exposed to strong mechanical and thermal stresses that can cause a variety of problems from cracks over partial detachment of the roll cover to damage to other components of the paper or board machine with the associated downtime and repair costs.
  • problems are often in the area of the connection between the roll core and the roll cover. It is the subject of extensive research and development to connect the different property profiles of metallic and plastic components at the interfaces.
  • Baselayer which is the Mediation between roll core and roll cover serves, the weakest point of the roll.
  • the roll cover has one or more layers, wherein the layer or at least one of the layers is formed from a foamed metallic or alloyed material.
  • the use of the foamed metallic material according to the invention can ensure that the thermal conductivity is increased many times over that of conventional roll covers, while the modulus of elasticity is increased by the targeted modeling of the metal foam in a desirable area can be performed.
  • the heat dissipation is thus considerably more efficient than conventional roller covers.
  • foamed metallic or alloyed material is used instead of an elastomer as a base layer between the roll core and the roll cover, a more effective heat dissipation can also be achieved which compensates for the temperature the temperature rising in the upper regions of the roll cover towards the roll core due to the resulting high line loads.
  • metal is overall more thermally resistant than composite materials.
  • the roll can be operated at a higher temperature, which in turn ensures that a better calendering effect can be achieved in heated calender positions, resulting in higher gloss values and less roughness. This can have a positive effect on the energy requirements of the fiber web machine and on savings in coating the fibrous web.
  • the foamed metallic or alloyed material aluminum, bronze, zinc, zinc alloys, aluminum alloys such as AISi or mixtures of said substances contained, which are characterized by high temperature resistance and excellent thermal conductivity.
  • the foamed metallic or alloyed material may be substantially closed-pored.
  • pores present in the foamed metallic or alloyed material may be distributed homogeneously or approximately homogeneously in the material. This ensures that in the at least one layer, which comprises the foamed metallic material, a substantially uniform heat dissipation can take place over the entire extent thereof.
  • the pores may be distributed under a gradient in the at least one layer, with a lower pore volume per unit volume radially inward and an increasing pore volume per volume unit radially outward.
  • An average diameter of the pores can range from 0.1 to 1 mm.
  • the material has a modulus of elasticity between 2000 and 10000 MPa, preferably about 5000 MPa.
  • the material has a thermal conductivity of about 3 to 25 W / mK.
  • the roller may have a seal on a fiber web contact side. This ensures a high smoothness of the fiber web contact side and corresponding possibilities of improved calendering effect and / or saving of thermal energy or drive power during operation of the calender.
  • the seal may preferably be a filled epoxy resin having a thickness of 2 to 10 mm or a thermal coating having a thickness of 0.05 to 0.3 mm.
  • An advantageous process for producing a roll for use in a machine for producing and / or processing and / or finishing a fibrous web, such as a paper or board web may comprise the following process steps: applying a metal web containing a blowing agent to the roll core to produce at least one layer Fixing the metal sheet on the roll core by pressing, cold rolling or winding and gluing, supplying heat from the outside to heat the blowing agent-containing layer to the melting region and thereby foaming the material of the layer.
  • An alternative advantageous method for producing a roll for use in a machine for producing and / or processing and / or finishing a fibrous web, such as a paper or board web may be the following process steps have: Cold deformation of a flat semi-finished product to the desired radius of the roll core, foaming by heat, applying the half or partial shell segments on the roll core by means of adhesive method for producing at least one layer and joining the segments by means of a welding or gluing process.
  • a further method step may be provided, which provides for sealing the roll cover with a seal, and which comprises the following substeps: grinding or over-turning the roll cover and thereby opening near-surface pores of the foamed metallic material; Applying the seal while allowing the sealant material to enter the open pores.
  • FIG. 1 shows a highly schematic representation of a calender roll stack in which a roll according to the invention can be used
  • Fig. 2 is a highly schematic sectional view of a roll cover for a roll according to the invention.
  • a calender roll stack 1 for a high-performance calender for smoothing a fibrous web F is shown in highly schematic form to explain the inventive measures.
  • the inventively designed rolls can also be used in other positions, such as in the press section of a machine for producing a fibrous web to the application.
  • the calender roll stack 1 described by way of example is formed from a plurality of rolls 2, 3, 4 arranged one above the other in a vertical stacking plane in the exemplary embodiment.
  • ten rollers 2, 3, 4 are shown, but it is also possible to use more or fewer rollers 2, 3, 4, depending on the type and quality of the fibrous web F to be processed.
  • the stack level may also be inclined, for example at an angle of about 40 to 50 °.
  • the fibrous web F passes through all calendering gaps which are formed by two adjacent and pressed-together rolls 2, 3, 4. Between the Glättspalten the fibrous web F is guided over guide rollers 5.
  • the calender roll stack 1 is limited in the embodiment of two soft end rolls 2, wherein between the end rolls 2 a plurality of intermediate rolls 3, 4 are arranged, some of which may be formed as hard rolls 3 and some as soft rolls 4.
  • the soft rolls 2, 4 have either an elastic roll shell which is supported from the inside or a roll cover made of plastic on a preferably metallic core or on a core made of a composite material. On the structure of the soft rolls 2, 4 will be discussed in more detail below.
  • the hard rollers 3 have a roll shell of metal, alternatively of a metal-coated composite material which is heated from the inside.
  • the heating can be done in various ways, for example, by hot oil.
  • a roll cover 1 1 is arranged, which has at least one or more layers 12.
  • this simultaneously represents the fiber web contact surface, in the case of a plurality of layers 12, the outermost of these layers 12 is suitably designed to come into contact with the fibrous web F.
  • the roll cover 1 1 must have a modulus of elasticity, which produces an optimal pressure curve in the smoothing gap between two rolls 2, 3, 4 over the entire axial length of the rolls 2, 3, 4.
  • the conventional materials which form the state of the art for this purpose, are composite materials with embedded fiber reinforcements or in many cases even pressed paper or textile discs, which are plugged onto the roller core 10 and pressed by end plates.
  • the modulus of elasticity of the roll cover 1 1 should be for the listed applications in the order of about 5000 MPa.
  • Metals and metal alloys have a significantly higher modulus of elasticity than fiber composites. This is around values of around 70000 MPa, which is why it is necessary to lower it for the desired applicability in press or calender positions.
  • the preferred values are on the order of about 2000 MPa to about 10000 MPa, in particular about 5000 MPa.
  • the metallic or alloyed material 13 is thus subjected to a treatment which allows to lower the elastic modulus and thus to generate the desired property profile.
  • a blowing agent is introduced into the still moldable material 13, which produces bubbles or pores in the material 13.
  • the injection of gas or sintering of the material 13 can also produce the desired porous foam structure.
  • metal or alloy foams are often done by means of metal powder and a metal hydride, for example titanium dihydride. Both powders are mixed together and then compacted by hot pressing or extrusion to a starting material. The starting material is then heated to a temperature above the melting point of the metal. The titanium dihydride releases gaseous hydrogen and foams the mixture.
  • metal foams For example, it is possible to inject gas into a molten metal which has previously been made foamable by adding solid constituents.
  • aluminum alloys are used to Stabilization 10-20% by volume of silicon carbide or alumina added. The addition of calcium is also possible. In this case, an increase in viscosity and a concomitant stabilization of the melt is achieved by alloying.
  • the Schlickerreticiansschaumsinter method (SRSS method) is available, with the iron, steel and nickel foams can be produced in particular.
  • SRSS method Schlickerreticiansschaumsinter method
  • a slurry is foamed by means of hydrogen, which is formed by the reaction of acid with the respective metal powder.
  • the foam structure is set and dried in a mold.
  • the resulting green compact is then sintered under reducing atmosphere or in vacuo.
  • the foaming processes generally described above can be applied to roll covers 11 for use in fibrous web machines.
  • the roll cover 1 1 may e.g. from a metal or metal alloy sheet containing a blowing agent, which is applied to the roll core 10 by, for example, pressing, cold rolling, or winding and gluing.
  • the layer containing the blowing agent is heated to the melting range of the metal or alloy and thereby foamed.
  • a gradient in density and pore volume between the roll core 10 and surface of the roll cover 1 1 can be generated so that adjacent to the roll core 10, a relatively high density with low pore volume and radially outward decreasing density with a larger pore volume can be observed.
  • metal-coated polymer spheres for example of foamed polystyrene
  • foamed polystyrene also leads to a vesicular, porous structure of the metallic or alloyed material 13, which exhibits the desired properties.
  • APM advanced pore morphology
  • a largely closed-pore structure is formed, which is characterized by a high thermal conductivity and temperature resistance and thereby has a modulus of elasticity which can be adapted to the selected position of the roll 2, 4.
  • foamed metallic or alloyed materials 13 are characterized by high impact energy absorption and good compressive strength. This leads to excellent damping properties, which act vibration-inhibiting, excellent mechanical stability and thus high durability.
  • the property profiles mentioned by using the foamed metallic or alloyed material are achievable both for inner layers 12 as a base layer to the roll core 10 as well as for the fiber web F contacting functional layers.
  • the roller 2, 4 may have a seal 15 on a fiber web contact side. This ensures a high degree of smoothness of the fiber web contact side and corresponding Possibilities of saving drive energy, which plays a role especially in the calender.
  • the seal 15 may be, for example, a filled epoxy with a thickness of 2 to 10 mm.
  • the transition between the foamed metallic material 13 and the seal 15 can also be formed fluently, as a gradient or by means of a transition layer.
  • the existing of the foamed metallic or alloy material 13 roll cover 1 1 is processed for example by grinding or over-turning.
  • the seal 15 may also be a thermal coating having a thickness of 0.05 to 0.3 mm.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)
  • Paper (AREA)

Abstract

La présente invention concerne un cylindre (2, 4) utilisé dans une machine pour fabriquer et/ou usiner et/ou façonner une bande de matière fibreuse (F) telle qu'une bande de papier ou de carton, lequel cylindre présente une partie centrale (10) et un revêtement (11) qui est situé sur la partie centrale et qui comprend au moins une couche (12) ou plusieurs couches (12), ladite couche (12) ou au moins une desdites couches (12) étant composée d'un matériau expansé à base de métal ou d'alliage (13).
PCT/EP2013/067277 2012-08-21 2013-08-20 Cylindre et procédé de fabrication d'un tel cylindre WO2014029754A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13753151.3A EP2888402A1 (fr) 2012-08-21 2013-08-20 Cylindre et procédé de fabrication d'un tel cylindre
CN201380043751.5A CN104583490A (zh) 2012-08-21 2013-08-20 辊子和用于制造辊子的方法
US14/422,724 US20150211181A1 (en) 2012-08-21 2013-08-20 Roller and method for producing a roller

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012214815.9 2012-08-21
DE102012214815 2012-08-21

Publications (1)

Publication Number Publication Date
WO2014029754A1 true WO2014029754A1 (fr) 2014-02-27

Family

ID=49035565

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/067277 WO2014029754A1 (fr) 2012-08-21 2013-08-20 Cylindre et procédé de fabrication d'un tel cylindre

Country Status (4)

Country Link
US (1) US20150211181A1 (fr)
EP (1) EP2888402A1 (fr)
CN (1) CN104583490A (fr)
WO (1) WO2014029754A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028552A1 (fr) * 1997-10-14 1999-06-10 Valmet Corporation Rouleau de construction legere et procede de fabrication dudit rouleau
EP1057931A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
DE19928755A1 (de) 1999-06-23 2000-12-28 Voith Sulzer Papiertech Patent Elastische Walze

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09250539A (ja) * 1996-03-19 1997-09-22 Shin Etsu Polymer Co Ltd 半導電性ロールとその製造方法
US6007657A (en) * 1998-06-29 1999-12-28 Xerox Corporation Method for increasing thermal conductivity of fuser member having elastomer and anisotropic filler coating
JP4562072B2 (ja) * 2003-07-17 2010-10-13 シンジーテック株式会社 二層ロールの製造方法及び円筒部材の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999028552A1 (fr) * 1997-10-14 1999-06-10 Valmet Corporation Rouleau de construction legere et procede de fabrication dudit rouleau
EP1057931A2 (fr) * 1999-06-02 2000-12-06 Voith Sulzer Papiertechnik Patent GmbH Rouleau élastique et procédé de fabrication d' un tel rouleau
DE19925421A1 (de) 1999-06-02 2000-12-07 Voith Sulzer Papiertech Patent Elastische Walze und Verfahren zum Herstellen einer solchen
DE19928755A1 (de) 1999-06-23 2000-12-28 Voith Sulzer Papiertech Patent Elastische Walze

Also Published As

Publication number Publication date
CN104583490A (zh) 2015-04-29
US20150211181A1 (en) 2015-07-30
EP2888402A1 (fr) 2015-07-01

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