EP3662107B1 - Pressmantel und dessen verwendung sowie presswalze und schuhpresse - Google Patents

Pressmantel und dessen verwendung sowie presswalze und schuhpresse Download PDF

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Publication number
EP3662107B1
EP3662107B1 EP18731427.3A EP18731427A EP3662107B1 EP 3662107 B1 EP3662107 B1 EP 3662107B1 EP 18731427 A EP18731427 A EP 18731427A EP 3662107 B1 EP3662107 B1 EP 3662107B1
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EP
European Patent Office
Prior art keywords
press
polymer layer
press cover
cover
shoe
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.)
Active
Application number
EP18731427.3A
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German (de)
English (en)
French (fr)
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EP3662107C0 (de
EP3662107A1 (de
Inventor
Delphine Delmas
Hermann Reichert
Michael Wokurek
Uwe Matuschczyk
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 Patent GmbH
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Filing date
Publication date
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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
    • 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
    • D21F3/0236—Belts or sleeves therefor manufacturing methods

Definitions

  • the invention is based on a press cover, in particular for a press device for treating a fibrous web, e.g. for smoothing or dewatering it, in detail according to the independent claims.
  • the invention also relates to a press roll, a shoe press and the use of a press cover in such a press, in detail according to the independent claims.
  • Pressing devices such as shoe presses have long been part of modern paper machines. They essentially comprise a stationary shoe (also called a press shoe), which extends in a cross-machine direction, and a press sleeve that runs around the stationary shoe. The latter is deformable and essentially takes on a tubular shape during operation.
  • the shoe is shaped in such a way that it forms a press nip with a counter roll.
  • the press nip is defined by the contact surface of the counter roll in the shoe.
  • the shoe is designed to be movable and can be moved to the counter roll.
  • the press sleeve has to meet enormous demands in terms of stability, namely in terms of surface hardness, resistance to pressure, temperature and hydrolysis.
  • the press sleeve is also exposed to strong alternating bending loads during operation.
  • Press covers must therefore be sufficiently flexible so that it can be guided around the shoe, it must be sufficiently rigid so that it does not deform or compress too much in the nip under the press load, and it must be sufficiently wear-resistant.
  • Press covers therefore consist of a single or multi-layer polymer layer, preferably polyurethane, in which reinforcing threads in the form of scrims or fabrics can be embedded.
  • the present invention relates to such generic objects as mentioned above.
  • Multilayer press sleeves known from the state of the art tend to fail prematurely when used as intended due to a - often only local - detachment of one of the polymer layers. In practice, this leads to unplanned downtimes of the press device and thus to increased, costly downtimes.
  • Corresponding press sleeves are made of US 2009/0038770 A1 , DE 102015217941 A1 and the WO 2016/163350 A1 known.
  • detachment of the individual polymer layers is to be avoided, the service life of such a press cover is to be increased and the downtimes of a press device equipped with such a press cover are to be reduced.
  • the inventors have recognized that detachment of the individual polymer layers can be avoided if the individual polymer layers are precisely aligned This is the case when the thickness of the radially outermost polymer layer of a multilayer press cover is between at least 5 and at most 60%, preferably at most 55% of the total thickness of the press cover, i.e. the thickness of all polymer layers.
  • the values mentioned are inclusive.
  • the mechanism of action could not be conclusively clarified, the inventors noticed that with such a thickness ratio, a press cover can be specified that has a particularly low tendency for the individual polymer layers to delaminate during operation of the press. This finding is initially independent of the material used for the press cover.
  • the inventors have recognized that, in addition to the two measures of the thickness and depth ratio, delamination can be prevented by making the first and second polymer layers different in terms of their hardness. A difference of 1 to 6 Shore is sufficient, namely if the second polymer layer is made less hard than the first polymer layer.
  • thickness or depth when, according to the present invention, thickness or depth is mentioned, this means the largest spatial extension measured in the radial direction, i.e. perpendicular to the longitudinal axis of the press cover.
  • the total thickness is the vertical distance between its radially outermost and radially innermost surface.
  • a pressing device is understood to mean, for example, a shoe press, e.g. for dewatering or treating, such as smoothing, a fibrous web.
  • the shoe press comprises a shoe press roll and a counter roll, which together form or delimit a press nip.
  • the shoe press roll further comprises a rotating press cover and a stationary press element, the so-called press shoe.
  • the latter is supported on a supporting, also stationary yoke - for example via hydraulic press elements - and is pressed against the rotating press cover.
  • the press cover rotates relative to the fixed press shoe and yoke and is thereby pressed against the counter roll in the press nip.
  • the press shoe and yoke are arranged radially within the press cover.
  • the term stationary is understood to mean that the press element does not rotate relative to the shoe press roll or the counter roll, but can move translationally - towards and away from the counter roll, preferably in the radial direction of the counter roll - and thus relative to the counter roll.
  • one or more press felts that run continuously in the circumferential direction and/or further press belts that run continuously can be guided through the press nip of the shoe press.
  • Such a shoe press can of course comprise more than one press nip.
  • a fibrous web in the sense of the invention is understood to mean a tangle or interlace of fibers, such as wood fibers, plastic fibers, glass fibers, carbon fibers, additives, or the like.
  • the fibrous web can be designed as a paper, cardboard or tissue web. It can essentially comprise wood fibers, with small amounts of other fibers or There may also be additional substances and additives. This is left to the specialist depending on the application.
  • a press cover in the sense of the invention is understood to mean a belt, hose or a cover which, as shown, is guided through the press nip of a shoe press together with a fibrous web.
  • the radially outermost surface (polymer layer) of the press cover can, during normal operation, come into contact with a press felt, which directly supports the fibrous web to be dewatered.
  • the press cover can, for example, come into direct contact with the fibrous web in order to smooth it.
  • the press cover is designed as a closed cover (hose) that is endless in the circumferential direction around its longitudinal axis.
  • the press cover can therefore be held at these axial ends by two lateral tensioning disks in order to form the shoe press roller.
  • the press sleeve can be guided over the press shoe and several guide rollers, as is the case with open shoe presses. Regardless of whether the press sleeve is guided by the tensioning disks or the guide rollers, the press shoe (or the guide rollers) comes into contact (temporarily) with part of the radially innermost surface of the press sleeve.
  • the radially outermost surface of such a press sleeve e.g. the radially outermost polymer layer of the same, is provided with grooves and/or blind holes.
  • the press jacket can be made partially or completely from a polymer.
  • the polymer used can be a castable, curable, preferably elastomeric polymer such as polyurethane.
  • the polymer can therefore be configured as a cast elastomer.
  • polymer layer refers to a layer that comprises such a castable, curable, preferably elastomeric polymer or is made entirely from it.
  • the polymer layer can preferably be a one-piece, molded layer. hardened layer. In other words, this is monolithically formed, i.e. produced by casting, for example.
  • one-piece also includes cases in which the one layer was produced from several layers of the same material when the polymer was cast. However, this only applies to the extent that these layers are essentially no longer visible after hardening, but rather a single, preferably uniform layer is formed. The same applies to the finished press jacket.
  • the press cover can be arranged one above the other in the radial direction - at least in sections across the width of the press cover. At least in sections across the width of the press cover means that the press cover, for example, has only one layer at its axial ends, whereas it has two or more layers between the axial ends.
  • the polymer layers can also extend across the entire width of the press cover.
  • the thickness of the press cover - and thus the thickness of the individual polymer layers - can also vary in sections along the longitudinal axis in a section through its longitudinal axis.
  • the radially outermost polymer layer can be smaller in the area of the width edges of the press cover than in the middle of the press cover.
  • the radially outermost polymer layer can be less thick than a radially inner or radially innermost polymer layer.
  • exactly two or three polymer layers are provided. These can be identical in terms of their polymer or vary in terms of their hardness or stoichiometry of the prepolymer.
  • a total thickness of the finished press cover in a section through the longitudinal axis thereof measured in the radial direction can be 5 to 10 mm, preferably 5 to 7, particularly preferably 5 to 6 mm.
  • the press cover when a single layer is provided, the press cover can be made from only one casting, i.e. monolithically, so that the single layer has the thickness just mentioned.
  • a finished press jacket in the sense of the invention is one whose polymer layers have been cured and possibly finally processed, i.e. for the is ready for use for the purpose mentioned above, e.g. in a shoe press.
  • a finished polymer layer means a layer that has hardened.
  • the press cover has a reinforcing structure.
  • the term reinforcing structure in the sense of the invention refers to a reinforcement of the at least one layer containing the polymer or consisting of it - i.e. the polymer layer.
  • the reinforcing structure can be completely embedded in the polymer layer so that the reinforcing structure does not extend beyond the boundaries of the polymer layer.
  • the polymer layer takes on the role of a matrix which surrounds the reinforcing structure and binds it to the matrix as a result of adhesion or cohesion forces.
  • Such a reinforcing structure can comprise textile linear structures - e.g.
  • starting material is understood to mean the material or semi-finished product by means of which the reinforcing structure of the finished press cover according to the invention is produced.
  • At most refers to a right-hand closed interval that includes all values between greater than 0 and the maximum specified value (maximum value). For example, if we say “at most 5", we mean the interval between (including or greater than) 0.01 and (including or exactly) 5.
  • the invention also relates to a press roll, such as a shoe press roll, for a shoe press for dewatering a fibrous web, wherein the press roll has at least one press cover according to the invention.
  • the invention also relates to a shoe press for dewatering a fibrous web, preferably a paper, cardboard, tissue or pulp web, comprising a press roll, namely a shoe press roll, and a counter roll, which together forming or delimiting a nip, wherein the press roller comprises a circumferential press cover, wherein the press cover is designed according to the invention.
  • the invention relates to the use of a press cover according to the invention for a press, namely a shoe press for dewatering a fibrous web, preferably a paper, cardboard, tissue or cellulose web.
  • FIG.1 A shoe press 10 is shown in a partially sectioned, schematic side view, which in the present case comprises a press roll according to the invention, namely a shoe press roll 12, and a counter roll 14.
  • Shoe press roll 12 and counter roll 14 are arranged parallel to one another with respect to their longitudinal axes. Together they form a nip 22 or delimit such a nip.
  • the shoe press roll 12 is composed of a shoe 16, a stationary yoke 18 supporting it and a press cover 20.
  • Shoe 16 and yoke 18 are arranged fixedly in relation to the counter roll 14 and the press cover 20. This means that they do not rotate.
  • the shoe 16 is supported by the yoke 18 and pressed by hydraulic pressing elements (not shown) onto the radially innermost surface of the press cover 20 rotating relative thereto.
  • the shoe press 10 is particularly suitable for dewatering fibrous webs 24.
  • a fibrous web 24 is guided through the press nip 22 with one or two press felts 26, 26'.
  • pressure is exerted indirectly on the fibrous web 24 in the nip 22 by the press felts 26, 26'. This occurs because the radially outermost surface of the counter roll 14 on the one hand and the radially outermost surface of the press cover 20 on the other hand come into direct contact with the corresponding press felts 26, 26'.
  • the liquid emerging from the fibrous web 24 is temporarily absorbed by the press felt(s) 26, 26' and any depressions provided in the press cover surface (not shown). After leaving the nip 22, the liquid absorbed by the depressions of the press cover 20 is spun off before the press cover 20 re-enters the press gap 22. In addition, the water absorbed by the press felt 26, 26' can be removed with suction elements after leaving the press gap 22.
  • the press felts 26, 26' can be dispensed with.
  • the fibrous web 24 is in direct contact with the press cover 20 on the one hand and with the counter roll 14 on the other hand, which together form a press nip.
  • the latter can then be designed as a heated drying cylinder.
  • FIG. 2a and 2b Different embodiments of the invention are shown in a partially illustrated cross-section through the longitudinal axis 20' of the finished press cover 20, which is not to scale.
  • the distance between the longitudinal axis 20' and the radially innermost surface of the corresponding polymer layer of the press cover 20 is also not shown to scale.
  • first polymer layer 20.1 is also the radially outermost polymer layer of the press cover 20.
  • second polymer layer 20.2 is also the radially innermost polymer layer of the press cover 20. Both polymer layers 20.1, 20.2 are directly adjacent to one another in the radial direction, ie there is no intermediate layer between them.
  • a reinforcing structure 20" can be provided in the second polymer layer 20.2.
  • a reinforcing structure 20" is embedded in the single polymer layer 20.1. This is indicated by the hatched circles, which can be textile surface or linear structures such as fibers.
  • the reinforcing structure 20" is completely embedded in the second polymer layer 20.2. This means that the reinforcing structure 20" does not extend beyond the boundaries of the polymer layer 20.2.
  • the first and a second polymer layer 20.1, 20.2 are made of a polyurethane. This is obtained from a prepolymer and a crosslinker.
  • the thickness d of the first polymer layer 20.1 - viewed in the radial direction - is according to the invention less than half the total thickness D of the entire press jacket 20, i.e. the thickness of all polymer layers 20.1, 20.2 together.
  • Figure 2b shows in a variation of the Fig. 2a a three-layer press jacket.
  • This comprises a first polymer layer 20.1 - here the radially outermost one - a radially innermost third polymer layer 20.3 and a second polymer layer 20.2 sandwiched between these two.
  • the arrangement refers - as in the illustration of the Fig. 2a - starting from the longitudinal axis 20' of the press cover 20 in its radial direction. In the present case, only a (single) reinforcing structure 20" is provided in the second polymer layer 20.2.
  • the first and second polymer layers 20.1, 20.2 are each made of a polyurethane or contain one. This also applies analogously to the Fig. 2a .
  • Fig.3 shows a highly schematic side view of a device for producing a press cover 20 according to the invention.
  • the device has exactly one cylindrical winding mandrel 4, with a starting material 20"' being applied spirally to its radially outermost surface.
  • the starting material 20 ⁇ forms the reinforcing structure 20" of the finished press cover 20 according to the invention after being embedded in the polymer.
  • the illustration shows an initial stage of the manufacturing process.
  • one end of the starting material 20′′′ is attached to a polymer that is arranged on the outer circumference of the winding mandrel 4.
  • one end of the starting material 20′′′ could also rest directly on the winding mandrel 4. or applied without a polymer initially being provided between the starting material 20′′′ and the winding mandrel 4.
  • the starting material 20′′′ can be a textile fabric or linear structure.
  • the winding mandrel 4 is mounted so that it can rotate about its longitudinal axis 20', which corresponds to the longitudinal axis of the press cover to be produced. Longitudinal axis 20' runs perpendicularly into the plane of the drawing.
  • a casting material such as a pourable, curable elastomeric polymer, e.g. polyurethane, is fed from above through a line 5 through a pouring nozzle 6 onto the radially outermost surface of the winding mandrel 4 or onto the starting material 20′′′.
  • Such a casting material can be selected, for example, with regard to its pot life and viscosity, such that it does not drip down from the winding mandrel 4 during pouring.
  • the winding mandrel 4 is rotated in the direction of the arrow about its longitudinal axis.
  • the pouring nozzle 6 is fed via a suitable, in Fig.3 not shown guide parallel to the longitudinal axis 20' along this relatively along the winding mandrel 4.
  • the starting material 20′′′ is unrolled and wound onto the rotating winding mandrel 4 to form spirals.
  • the casting material can thereby pass through the starting material 20′′′ to the winding mandrel 4.
  • the polymer forms a radially innermost and preferably elastomeric polymer layer, which corresponds to the polymer layer 20.2 of the press jacket made of Fig. 2a corresponds to which in Fig.3 only a part is shown.
  • the casting material emerging from the casting nozzle 6 is a mixture of a prepolymer and a crosslinker.
  • the former is provided from a prepolymer container (not shown) in which it is stored or mixed.
  • the prepolymer can comprise an isocyanate according to the invention and a polyol.
  • the prepolymer container it can be present, for example, in the form of a prepolymer made of the substances just mentioned.
  • the crosslinker can be provided in a crosslinker container. It is designed according to the invention.
  • Prepolymer containers and crosslinker containers are assigned to the device for producing a press cover 20. They are connected in a flow-conducting manner to a mixing chamber (not shown) upstream of the pouring nozzle 6 in the flow direction via lines (also not shown). The prepolymer-crosslinker mixture is thus produced upstream and outside of the pouring nozzle 6, i.e. mixed in the mixing chamber. Irrespective of the production of the mixture, it is then applied to the surface of the winding mandrel 4 to form the at least one polymer layer of the press cover 20.
  • an endless, self-contained, cylindrical tube-shaped press sleeve 20 is gradually produced across the width of the winding mandrel 4, the inner circumference of which essentially corresponds to the outer circumference of the winding mandrel 4.
  • the source material 20′′′ on more than one Fig.3 shown winding mandrel 4.
  • two winding mandrels could be provided, which could be arranged parallel with respect to their longitudinal axes at a distance from one another.
  • the finished press cover 20 is finally removed from the at least one winding mandrel 4.
  • the press cover 20 is designed according to the invention.
  • the reinforcement structure 20" of the at least one polymer layer 20.1, 20.2 could also be constructed from several starting materials 20′′′ placed one above the other in the radial direction, each running in the longitudinal axis direction and in the circumferential direction of the press cover 20.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Polyurethanes Or Polyureas (AREA)
EP18731427.3A 2017-07-31 2018-06-13 Pressmantel und dessen verwendung sowie presswalze und schuhpresse Active EP3662107B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017117227.0A DE102017117227A1 (de) 2017-07-31 2017-07-31 Pressmantel und dessen Verwendung sowie Presswalze und Schuhpresse
PCT/EP2018/065606 WO2019025065A1 (de) 2017-07-31 2018-06-13 Pressmantel und dessen verwendung sowie presswalze und schuhpresse

Publications (3)

Publication Number Publication Date
EP3662107A1 EP3662107A1 (de) 2020-06-10
EP3662107C0 EP3662107C0 (de) 2024-05-01
EP3662107B1 true EP3662107B1 (de) 2024-05-01

Family

ID=62620875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18731427.3A Active EP3662107B1 (de) 2017-07-31 2018-06-13 Pressmantel und dessen verwendung sowie presswalze und schuhpresse

Country Status (6)

Country Link
US (1) US20210131034A1 (zh)
EP (1) EP3662107B1 (zh)
JP (1) JP7044864B2 (zh)
CN (1) CN110998020B (zh)
DE (1) DE102017117227A1 (zh)
WO (1) WO2019025065A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018122777A1 (de) * 2018-09-18 2020-03-19 Voith Patent Gmbh Pressmantel, dessen Verwendung sowie Presswalze und Schuhpresse
JP6909549B1 (ja) * 2020-01-30 2021-07-28 東芝三菱電機産業システム株式会社 系統周波数検出器

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19651557A1 (de) * 1996-12-11 1998-06-18 Voith Sulzer Papiermasch Gmbh Preßmantel
JP4827542B2 (ja) * 2006-01-31 2011-11-30 イチカワ株式会社 製紙機械用ベルト
DE102009028215B3 (de) * 2009-08-04 2010-09-09 Voith Patent Gmbh Kombination eines Pressfilzes mit einem Presswalzenbezug und/oder einem Saugwalzenbezug für eine Papiermaschine
DE102011004565A1 (de) * 2011-02-23 2012-08-23 Voith Patent Gmbh Pressenpartie einer Maschine zur Herstellung einer Faserstoffbahn
JP5161376B1 (ja) 2012-02-01 2013-03-13 イチカワ株式会社 製紙用シュープレスベルト
US9650743B2 (en) * 2012-08-15 2017-05-16 Voith Patent Gmbh Sealing device, suction roll and method for producing and/or processing a paper, cardboard or tissue web
CN106661838B (zh) * 2014-07-28 2019-07-23 福伊特专利有限公司 用于制备或加工滚筒的方法、滚筒和滚筒功能层
JP6674698B2 (ja) * 2015-04-07 2020-04-01 ヤマウチ株式会社 シュープレス用ベルト
DE102015217941A1 (de) * 2015-09-18 2017-03-23 Voith Patent Gmbh Pressmmantel und Verfahren zur Herstellung eines solchen

Also Published As

Publication number Publication date
JP2020528972A (ja) 2020-10-01
US20210131034A1 (en) 2021-05-06
WO2019025065A1 (de) 2019-02-07
CN110998020A (zh) 2020-04-10
EP3662107C0 (de) 2024-05-01
JP7044864B2 (ja) 2022-03-30
DE102017117227A1 (de) 2019-01-31
CN110998020B (zh) 2022-02-15
EP3662107A1 (de) 2020-06-10

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