WO2014191188A1 - Enveloppe de compression pour rouleau de presse à sabot - Google Patents

Enveloppe de compression pour rouleau de presse à sabot Download PDF

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Publication number
WO2014191188A1
WO2014191188A1 PCT/EP2014/059686 EP2014059686W WO2014191188A1 WO 2014191188 A1 WO2014191188 A1 WO 2014191188A1 EP 2014059686 W EP2014059686 W EP 2014059686W WO 2014191188 A1 WO2014191188 A1 WO 2014191188A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
outer layer
press cover
inner layer
layer
Prior art date
Application number
PCT/EP2014/059686
Other languages
German (de)
English (en)
Inventor
Delphine Delmas
Uwe Matuschczyk
Hermann Reichert
Michael Wokurek
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
Publication of WO2014191188A1 publication Critical patent/WO2014191188A1/fr

Links

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

Definitions

  • the invention relates to a press cover for a shoe press roll, in particular for use in a machine for producing and / or finishing a fibrous web, such as a paper, board or tissue web, according to the preamble of claim 1.
  • the press cover runs together with a fibrous web through a shoe press nip, which is formed between a stationary pressing element, the so-called press shoe, and a cylindrical counter-roller.
  • the press shoe is supported on a fixed yoke and is hydraulically pressed against the counter roll.
  • one or more endlessly circulating felts and / or further endlessly circulating press belts can be guided through the press nip.
  • the press cover of the shoe press roll is usually designed as a closed jacket, which is held by two side clamping disks and rotates around the fixed press shoe.
  • oil is applied to the inside of the press belt for lubrication.
  • the press cover can be guided as a press belt, as is the case with open shoe presses, over the press shoe and a plurality of guide rollers.
  • the surface of the press jackets is often provided with grooves and / or blind holes.
  • a fibrous web is fed through the press nip along with one or two press felts, the liquid emerging from the fibrous web due to the pressure exerted on the fibrous web in the press nip, which are dissolved and undissolved in addition to water, such as fibers , Fiber fragments, fillers and / or additives, is temporarily absorbed by the press felt and provided in the press shell surface depressions.
  • water such as fibers , Fiber fragments, fillers and / or additives
  • the liquid absorbed by the press cover is removed from the press cover spun off before the press cover enters the press nip again.
  • the water taken up by the press felt is removed after leaving the press nip with suction elements.
  • a press cover of such a shoe press must ideally meet a variety of requirements in order to achieve optimum results. Due to the high pressing forces, the high dwell time and the strong alternating bending in the shoe press nip, the press jackets are exposed to particularly high loads. Such a press cover must therefore be sufficiently flexible to be able to be guided around the shoe. At the same time, the press cover has to be sufficiently stiff so as not to be excessively deformed and deformed under the press load prevailing in the press nip. In addition, a press cover must have high wear resistance, good abrasion resistance, high cracking resistance, good crack growth resistance and high resistance to chemicals, especially water, oil, acids, bases and solvents.
  • press sleeves are usually constructed of fiber-reinforced polyurethane, ie of a composite material in which in a matrix of crosslinked polyurethane a fiber fabric or fiber fabric is embedded. Both single-layer and corresponding multi-layer press jackets are known.
  • a press cover for a shoe press which consists of one or more layers of crosslinked polyurethane, in the fiber fabric is embedded, is composed.
  • the crosslinked polyurethane is the reaction product of a prepolymer prepared from a 55 to 100 mole percent p-phenylene diisocyanate-containing isocyanate component and a polyol, and a crosslinker component containing 65 to 100 mole percent of one or more particular polyamines.
  • EP 2 248 944 A1 describes a press jacket for a shoe press, which is composed of a layer of crosslinked polyurethane in which fiber fabric is embedded.
  • the crosslinked polyurethane is the reaction product of a prepolymer prepared from a 55 to 100 mole% of p-phenylene diisocyanate, 4,4'-methylene diphenyl diisocyanate or toluene diisocyanate-containing isocyanate component and a polyol component containing polypropylene glycol, polytetramethylene glycol or polycarbonate diol, and a crosslinker component which contains 75 to 99.9 mol% of an aliphatic diol compound having a molecular weight between 62 and 1, 000, hydroquinone-bis-beta-hydroxyethyl ether or an organic polyamine compound having a molecular weight between 108 and 1,300 and 25 to 0 , 1 mol% of an aliphatic triol compound having a molecular weight between
  • this document discloses a corresponding press cover, for the production of a crosslinking component is used which 60 to 99.8 mol% of an aliphatic diol compound having a molecular weight between 62 and 1, 000 or hydroquinone bis-beta-hydroxylethylether, 0.1 to 15 mol% of an organic polyamine compound having a molecular weight between 108 and 1, 300 and 25 to 0.1 mol% of an aliphatic triol compound having a molecular weight between 92 and 134.
  • the known compression jackets have sufficient flexibility and at the same time sufficient rigidity, their chemical resistance, in particular to water and oil, abrasion resistance, cracking resistance, crack growth resistance and swelling behavior, need to be improved.
  • CMD cross machine direction
  • a shoe press jacket with edge zone reinforcements is disclosed in JP 2010/16652 A.
  • polyurethane reinforcements are inserted in the press cover, which reinforce the areas in which the shoe edge runs, and thus prevent material fatigue.
  • a disadvantage of this prior art is the risk of delamination, through which the reinforcements can flake off the press cover and can cause damage to the shoe press and subsequent machine parts as well as endangerment of employees.
  • the object of the present invention is therefore to provide a press jacket for a press roll of a shoe press, the press cover depending on the position in the cross machine direction in the press zone high wear resistance and good abrasion resistance in the edge zones high cracking resistance and good crack growth resistance and generally low Swelling and a high resistance to chemicals, especially water, oil, acids, bases and solvents, and at the same time characterized by a sufficiently high flexibility and rigidity.
  • a pressing region is either completely formed by the outer layer or that the pressing region is partially formed from the inner layer and partially from the outer layer, wherein a thickness of the outer layer decreases in edge regions of the pressing region or outside of the pressing region and zero in edge regions of the press roll is.
  • the material of the inner layer and the outer layer can be selected according to requirements so that the best possible properties for each position in the cross machine direction are given.
  • a hardness of the outer layer is greater than a hardness of the inner layer.
  • the hardness of the inner layer is between 90 and 96 ShoreA, preferably between 92 and 94 ShoreA.
  • the hardness of the outer layer may be between 90 and 98 ShoreA, preferably between 94 and 96 ShoreA.
  • the thickness of the inner layer can be a maximum of 4 mm and preferably between 2 and 4 mm.
  • the thickness of the outer layer may preferably be between 1 and 3 mm. According to one aspect of the invention it can be provided that the inner layer is thicker than the outer layer. According to another aspect of the invention it can be provided that the thickness of the inner layer corresponds approximately to the thickness of the outer layer.
  • At least the inner layer preferably also the outer layer, consist of a plastic, in particular of a polyurethane.
  • the inner layer can comprise reinforcements, preferably in the form of a woven fabric and / or netting.
  • the proportion of reinforcement on the volume of the inner layer can be between 5 and 30%.
  • Figure 1 is a schematic side view of a shoe press, which is suitable for use of an inventively designed press jacket, and
  • FIG. 2 shows a schematic section in the cross-machine direction through a press jacket designed according to the invention.
  • Fig. 1 for better understanding of the invention, first a shoe press with the associated clothing exemplified.
  • a fibrous web 4 is guided by the press nip 3 formed by a press roll 1 and a cylindrical counter roll 2 together with a dewatering belt 5 for receiving the pressed-out water.
  • the press nip 3 is made longer in the interest of intensive but gentle dewatering.
  • the flexible press cover 6 of the press roll via a support member 7 with concave pressing surface.
  • the support element 7 is supported on the support 8 of the press roll, is hydrostatically lubricated and pushes the press cover 6 towards the counter roll 2.
  • the press cover 6 consists, as can be seen in FIG. 2, of two layers 10, 1 1 made of polyurethane, a radially inner inner layer 10 which contacts the concave pressing surface and an outer outer layer 1 1, which contacts the fiber web 4.
  • a reinforcement 12 is usually provided, which may for example consist of intersecting longitudinal and circumferential threads 13, 14.
  • the volume of the reinforcement 12 is about 5 to 40% of the volume of the inner layer 10.
  • the inner layer 10 has a thickness between 2 and 4 mm, while the thickness of the outer layer 1 1 is between 1 and 3 mm.
  • the inner layer 10 is at least as thick or thicker than the outer layer 1 first
  • the inner layer 10 In order to achieve the above-mentioned high wear resistance and abrasion resistance properties in the cross machine direction inner crimping zone and edge zones, high crack resistance and crack growth resistance, and generally low swelling and high resistance to chemicals such as water, oil , Acids, bases and solvents to maintain, the inner layer 10 according to the invention softer than the outer layer 1 1 is formed.
  • the inner layer 10 has in a preferred embodiment, a hardness of 92 ShoreA and the outer layer 1 1 of 96 ShoreA.
  • the outer layer 1 1 is not provided over the entire extent of the press jacket 6 in the cross-machine direction, but only in an inner region which substantially corresponds to the press region 15.
  • the width of the individual components involved in the pressing process is staggered as follows: the width of the fibrous web 4 is the smallest, it is plus a certain amount of traveling up to about 100mm less than the width of the pressing area.
  • the pressing area 15 is narrower than the support element 7 up to about 200 mm.
  • a high abrasion resistance is desirable, which is achieved by a harder and impact resistant material.
  • the tendency to cracking and increased crack growth is the main source of malfunction and fractures of the press jacket 6.
  • a softer material conducive because the stability takes a subordinate role and rather the occurring flexing work must be compensated reliably.
  • the outer layer 11 may be embedded in the inner layer 10 like an insert.
  • the edge regions 16 only the inner layer 10 is present, in the pressing region 15, the outer layer 1 1 superimposed on the inner layer 10. The transition to axially outside can thereby gradually, also step-shaped. In this case, the pressing region 15 can also extend axially beyond the outer layer 11 into the region where the inner layer 10 forms the contact surface.
  • the outer layer 1 1, the inner layer 10 also cover the entire surface.
  • the harder layer must always at least partially overlap the softer one.
  • the variation of the hardness between inner layer 10 and outer layer 1 1 can be achieved by various methods during manufacture. On the one hand, it is possible to modify the formulation of the polyurethane itself. Furthermore, it is conceivable to change the stoichiometry so that different hardnesses can be achieved with the same polyurethane. The targeted addition of a plasticizer to the inner layer is possible.
  • the press cover 6 may, if it serves to drain the fiber web 3, in Fig. 2 not shown surface shapes such as blind holes and circumferentially extending grooves.
  • the invention is not limited to the illustrated embodiment.
  • the features of the invention are also applicable to transfer belts and roll covers made of polyurethane.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une enveloppe de compression (6) destinée à un rouleau de presse à sabot servant à traiter une bande de papier, de carton, de tissu ou d'une autre matière fibreuse (4) dans une machine de fabrication et/ou de finition de ladite bande. L'enveloppe de compression (6) comporte des éléments de support (7) intérieurs et au moins deux couches (10, 11) dont une est la couche intérieure (10) et l'autre la couche extérieure (11). Une zone de compression (15) est formée soit entièrement par la couche extérieure (11), soit en partie par la couche intérieure (10) et en partie par la couche extérieure (11). L'épaisseur de la couche extérieure (11) diminue dans des zones de bord de la zone de compression (15) ou hors de la zone de compression (15) et elle est nulle dans des zones de bord (16) du rouleau de presse (1).
PCT/EP2014/059686 2013-05-27 2014-05-13 Enveloppe de compression pour rouleau de presse à sabot WO2014191188A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013209788 2013-05-27
DE102013209788.3 2013-05-27

Publications (1)

Publication Number Publication Date
WO2014191188A1 true WO2014191188A1 (fr) 2014-12-04

Family

ID=50693684

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/059686 WO2014191188A1 (fr) 2013-05-27 2014-05-13 Enveloppe de compression pour rouleau de presse à sabot

Country Status (1)

Country Link
WO (1) WO2014191188A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978428A (en) * 1985-10-03 1990-12-18 Beloit Corporation Bearing blanket for an extended nip press having laminates of different hardnesses
DE4322322A1 (de) * 1993-07-05 1993-11-11 Voith Gmbh J M Pressenmantel einer Papiermaschine
DE4411620A1 (de) * 1994-04-02 1995-10-05 Voith Sulzer Papiermasch Gmbh Preßmantel und Verfahren zur Herstellung eines Preßmantels
DE102004033751A1 (de) * 2004-07-13 2006-02-02 Voith Paper Patent Gmbh Walzenmantel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4978428A (en) * 1985-10-03 1990-12-18 Beloit Corporation Bearing blanket for an extended nip press having laminates of different hardnesses
DE4322322A1 (de) * 1993-07-05 1993-11-11 Voith Gmbh J M Pressenmantel einer Papiermaschine
DE4411620A1 (de) * 1994-04-02 1995-10-05 Voith Sulzer Papiermasch Gmbh Preßmantel und Verfahren zur Herstellung eines Preßmantels
DE102004033751A1 (de) * 2004-07-13 2006-02-02 Voith Paper Patent Gmbh Walzenmantel

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