US20050199361A1 - Integral nip press belt - Google Patents

Integral nip press belt Download PDF

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Publication number
US20050199361A1
US20050199361A1 US11/064,312 US6431205A US2005199361A1 US 20050199361 A1 US20050199361 A1 US 20050199361A1 US 6431205 A US6431205 A US 6431205A US 2005199361 A1 US2005199361 A1 US 2005199361A1
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US
United States
Prior art keywords
layer
press belt
nip press
carrier
nip
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.)
Abandoned
Application number
US11/064,312
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English (en)
Inventor
Franz Danzler
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.)
Stowe Woodward AG
Original Assignee
Stowe Woodward AG
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 Stowe Woodward AG filed Critical Stowe Woodward AG
Assigned to STOWE WOODWARD AG reassignment STOWE WOODWARD AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DANZLER, FRANZ
Publication of US20050199361A1 publication Critical patent/US20050199361A1/en
Abandoned 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
    • 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 relates to a nip press belt for a wet press or a calender, in particular in a paper, cardboard or tissue machine, according to the precharacterizing clause of claim 1 .
  • nip press belt of this kind in German also called Pre ⁇ mantel (translatable as “press jacket”), is used in paper, cardboard or tissue machines to extract most of the water from the product concerned (wet press) or to finish the surface (calender).
  • Such presses or calenders have an elongated press gap (“nip”) and are therefore also called “nip presses”.
  • the press belt makes sliding contact, by way of its back (lower) surface, with the actual pressing element; therefore this back surface must have excellent sliding properties.
  • the press belt On its front (upper) surface the press belt makes contact either with a pulp felt (by way of which it indirectly contacts the product concerned) or—in the case of a calender—directly with the product, against which it is pressed by a rotating roller.
  • Nip press belts of various designs are known in the state of the art.
  • the patent EP 0 420 372 B1 describes a nip press belt of this generic kind with a basic web in the form of an endless loop covered on its inner and outer surfaces with a smooth polymer-resin coating, which makes the web impermeable to liquids and endows it with a uniform thickness.
  • the polymer resin that forms the elastomer is here specified as polyurethane.
  • the patent DE 50 20 005 C1 discloses another band for use in paper machines, in particular wet presses with elongated nip (nip presses).
  • the band has on its back surface a smooth, flexible band layer that is impermeable to liquids, and on the front surface there is a carrier tread with a fiber layer attached thereto.
  • the patent DE 42 02 731 A1 also discloses a belt, here termed “jacket”, of this generic kind for a nip press, which comprises an elastomeric jacket material and two layers of reinforcing threads.
  • jacket material As specification of the jacket material, reference is made here on one hand to material capable of swelling, and on the other hand to polyurethane.
  • a paper-machine web specifically a nip press belt—is described in which a carrier web with a polymer coating is provided, which comprises a thixotropic material (for example, aramid or silica glass).
  • the base material specified here is polyurethane.
  • patent DE 44 38 354 A1 discloses another press jacket made of elastomeric material, in which is embedded substantially parallel to the surface a woven layer of an extremely stable material, for example aramid fibers.
  • a wet press for extracting the water from strips of fibrous material which likewise comprises a nip press belt (here called “continuous belt”), and this document also discusses appropriate parameters for an elastomeric or rubber coating of this belt as well as the possibility of vulcanizing or pouring the elastomeric material onto the armoring of this belt.
  • the document EP 0 939 162 describes a nip press belt for paper machines with a multilayered construction, which also comprises specially oriented or wound textile layers and is said to be extraordinarily stable both in the machine direction and in the direction transverse thereto.
  • a nip press belt of this kind that has been further developed with respect to its elasticity properties and an advantageous multidimensional bending behavior is described in the applicant's patent EP 1 251 203 A1.
  • This more recent nip press belt is distinguished by being made of soft rubber with particular properties and, in advantageous embodiments, by the special structure of a textile reinforcment layer.
  • This new belt based on soft rubber, is preferably used in the so-called brown-paper market, but is also equally interesting for tissue applications, because the soft-rubber strip is well adapted to the movements of the so-called Yankee and promotes the production of a voluminous tissue product.
  • nip press belt with especially simple construction and hence low manufacturing costs, which nevertheless fulfills all the demands made in practice and achieves a long running time.
  • at least one appropriate manufacturing procedure for such a nip press belt is disclosed.
  • This objective is accomplished with respect to the apparatus by a nip press belt with the characteristics given in Claim 1 , and with respect to method by a manufacturing method with the characteristics given in Claim 9 or 10 .
  • the invention includes the fundamental idea that the nip press belt is integrally designed so as to produce the necessary profile of properties over its cross section, from the surface that contacts the pressing element to the surface that contacts the strip of fibrous material. It further includes the idea of implementing the water-extraction function of the belt by means of at least a superficial region of the carrier or reinforcement layer, which also provides the required tensile strength and is to a great extent embedded in the belt.
  • the carrier web serves both to ensure the necessary stability and resistance to deformation and also to extract water from the strip of fibrous material, so that there is no longer any need for a separate layer with special properties for water extraction. Hence a special manufacturing step to produce such a layer can be eliminated, which means that there is a considerable potential for cost reduction.
  • the integral belt proposed here is suitable for all nip-press applications.
  • the integral basic web can be constructed as a stitched-felt or continuous fabric, and can be single- or multi-layered, depending on the intended use. Furthermore, the decision as to whether the components of the basic fabric should be twisted or untwisted monofilaments, or a longitudinal/transverse combination of these variants, is made according to the specific purpose of the belt.
  • nip press belt a substantial proportion, in particular in the range between 1 ⁇ 3 and 2 ⁇ 3, of the thickness of the integral carrier and functional layer serves as the water-extraction profile for the object being pressed, while the remaining fraction of the thickness is fixedly connected to the surface on which the belt slides.
  • the first aspect to emphasize is that it should be absolutely impermeable to water and oil.
  • Specific elastomer materials to be especially recommended are polyurethane or a soft-rubber material.
  • a thermoplastic hair, in particular PEEK, or a thermoplastic film can be employed in forming the sliding surface.
  • a preferred embodiment of the method for manufacturing the proposed nip press belt is distinguished by the fact that the sliding layer is attached to a cylindrical carrier so that it covers the circumference thereof, after which a spliced (or continuous) textile material with shrinkage properties is pulled onto the carrier, over the sliding layer, and the sliding layer and textile carrier are together subjected to a thermal treatment during which the textile carrier shrinks onto the sliding layer and becomes intimately connected thereto.
  • the spliced textile material is stretched onto a cylindrical carrier and closed by a stitched seam, and thereafter a sliding-layer material is put onto the textile carrier—in particular, a thermoplastic material is pressed onto the textile carrier during the application of heat.
  • a sliding-layer material is put onto the textile carrier—in particular, a thermoplastic material is pressed onto the textile carrier during the application of heat.
  • a strip of plastic film in particular a Teflon strip
  • FIG. 1 is a schematic drawing of the wet-press section of a paper machine in longitudinal section
  • FIG. 2 is a simplified cross-sectional drawing of an embodiment of the nip press belt of such a wet press, constructed in accordance with the invention.
  • FIG. 1 shows part of the nip of a wet press 1 (nip press) of a paper machine with elongated nip.
  • a pressing element 3 Opposite a pressing element 3 is disposed a press-roller 5 , and in the gap between these two, namely the nip 7 , water is removed from a paper web 13 enclosed between the surface of the press-roller 5 and a nip press belt 9 that slides along the pressing element 3 , with a pulp felt 11 .
  • the nip press belt 9 must on one hand have elasticity and flexibility such that it conforms as well as possible to the curved surface of the pressing element 3 and exerts an elastic pressure uniformly upon the paper web 13 (by way of the pulp felt 11 ). On the other hand, it must be sufficiently stable to withstand the high, long-term stress (tension, pressure and vibration) in the nip 7 for a service time that is economically acceptable.
  • a nip press belt 9 suitable to meet these demands is shown (schematically) in cross section in FIG. 2 .
  • This belt is so designed that it will remain stable in the long term at temperatures above 100° C., and can tolerate brief temperature peaks of up to ca. 130° C.; its overall thickness is in the range between 3 and 6 mm, and it has a hardness in the range between 5 and 30 P+J.
  • the nip press belt 9 consists of a thick elastomeric sliding layer 9 a , made for instance of a thermoplastic resin or polyurethane, into which, while it was still in the fluid state, a multilayered carrier fabric 9 b has been shrunk.
  • FIG. 2 should be regarded as a synoptic representation, inasmuch as in the upper region various kinds of multifilament threads 9 c , 9 c ′ and monofilaments 9 d are symbolized as a possible implementation of the threads in the integral carrier fabric.
  • the reference code OV designates the open volume in the belt 9 , namely the space formed by the free-standing loops in the upper layer of the carrier fabric, which constitutes the water-extraction profile on the felt side.
  • the belt 9 is preferably-constructed so that the liquid or viscous sliding layer is applied to a mandrel (or drum), after which an overdimensioned textile fabric is pulled over it, and finally this fabric is shrunk down to size by the application of heat.
  • a mandrel or drum
  • the particular design of the fabric to be shrunk and/or the choice of shrinkage temperature determines the force that induces the shrinking and hence the degree to which the continuously woven or spliced and seamed fabric can penetrate the sliding-layer mass.
  • nip press belt is subsequently removed from the processing mandrel, for example by the application of compressed air.
  • the process of pulling the belt away from the mandrel is also facilitated by the fact that prior to the application of the sliding-layer material, the mandrel has been provided with a non-stick coating, by covering it with one of the customary substances or by wrapping a film around it.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
US11/064,312 2004-03-10 2005-02-23 Integral nip press belt Abandoned US20050199361A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011665.2-27 2004-03-10
DE102004011665A DE102004011665A1 (de) 2004-03-10 2004-03-10 Integraler Schuhpressenbelt

Publications (1)

Publication Number Publication Date
US20050199361A1 true US20050199361A1 (en) 2005-09-15

Family

ID=34813640

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/064,312 Abandoned US20050199361A1 (en) 2004-03-10 2005-02-23 Integral nip press belt

Country Status (3)

Country Link
US (1) US20050199361A1 (de)
EP (1) EP1574617A1 (de)
DE (1) DE102004011665A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080289716A1 (en) * 2007-05-23 2008-11-27 CROOK Robert Low tensile creep belt
US10836536B2 (en) 2016-05-02 2020-11-17 Pro Form Products Ltd. Tap assembly for solvent container
US20220372701A1 (en) * 2019-09-26 2022-11-24 Voith Patent Gmbh Press cover, the use thereof, and the use of a thermoplastic elastomer in the form of a copolymer for a polymer layer of a press cover

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564551A (en) * 1982-07-02 1986-01-14 Thomas Josef Heimbach Gmbh & Co. Wet-pressing belt for paper machines
US4701368A (en) * 1985-04-25 1987-10-20 Ichikawa Wollen Textile Co., Ltd. Papermaker's pressure belt for extended nip presses
US4787946A (en) * 1987-08-07 1988-11-29 Albany International Corp. Method of making a paper machine press belt
US4812185A (en) * 1987-08-07 1989-03-14 Albany International Corp. Method of making a paper machine press belt
US5175037A (en) * 1989-05-02 1992-12-29 Thomas Josef Heimbach Gmbh & Co. Belt for papermaking machines
US5196092A (en) * 1991-09-25 1993-03-23 Albany International Corp. Reinforcement of coated surfaces of lnp belts
US5427653A (en) * 1991-05-24 1995-06-27 Albany Nord Skafilt Ab Press and method for modifying a press for use in the press section of a papermaking machine
US6214752B1 (en) * 1997-10-20 2001-04-10 Ichikawa Co., Ltd. Shoe press jacket
US6319365B1 (en) * 1999-09-20 2001-11-20 Ichikawa Co., Ltd Web transfer belt and production process for the same
US7156956B2 (en) * 2003-08-11 2007-01-02 Albany International Corp. Paper industry process belt with a surface structure composed of a porous membrane

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL185678C (nl) * 1981-09-24 1990-06-18 Albany Int Corp Persinrichting voor het ontwateren van een vezelbaan, alsmede werkwijze voor het vervaardigen van een eindloze band daarvoor.
DE8319684U1 (de) * 1983-07-08 1984-10-11 J.M. Voith Gmbh, 7920 Heidenheim Biegsames band fuer eine presse zum entwaessern einer faserstoffbahn
JPS6081391A (ja) * 1983-10-07 1985-05-09 三菱重工業株式会社 抄紙用エンドレス・ベルト
DE3629736A1 (de) * 1986-09-01 1988-03-03 Becker Gummiwerke Nasspresse zum entwaessern von faserstoffbahnen
FI92738C (fi) * 1989-09-08 1994-12-27 Albany Int Corp Hihna
US4946731A (en) * 1989-09-28 1990-08-07 Albany International Corp. Construction for an extended nip press belt
DE4028085C1 (de) * 1990-09-05 1992-02-27 Thomas Josef Heimbach Gmbh & Co, 5160 Dueren, De
DE4202731C2 (de) * 1992-01-31 1997-04-17 Voith Gmbh J M Preßmantel für eine Schuhpresse
JP2961008B2 (ja) * 1992-04-30 1999-10-12 市川毛織株式会社 シュープレス用ベルト
FI945850A (fi) * 1993-12-14 1995-06-15 Appleton Mills Puristusnauha tai -hihna, johon kuuluu avoin alustakantaja käytettäväksi pitkän nipin puristimissa ja menetelmä sen valmistamiseksi
GB2284772B (en) * 1993-12-15 1997-11-26 Scapa Group Plc Papermachine clothing
DE4438354A1 (de) * 1994-10-27 1996-05-02 Voith Sulzer Papiermasch Gmbh Preßmantel und Verfahren zur Herstellung eines Preßmantels
JP3408416B2 (ja) * 1998-02-26 2003-05-19 市川毛織株式会社 シュープレス用ベルト及びその製造法
ATE364750T1 (de) * 2001-04-18 2007-07-15 Stowe Woodward Ag Schuhpressenbelt

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4564551A (en) * 1982-07-02 1986-01-14 Thomas Josef Heimbach Gmbh & Co. Wet-pressing belt for paper machines
US4701368A (en) * 1985-04-25 1987-10-20 Ichikawa Wollen Textile Co., Ltd. Papermaker's pressure belt for extended nip presses
US4787946A (en) * 1987-08-07 1988-11-29 Albany International Corp. Method of making a paper machine press belt
US4812185A (en) * 1987-08-07 1989-03-14 Albany International Corp. Method of making a paper machine press belt
US5175037A (en) * 1989-05-02 1992-12-29 Thomas Josef Heimbach Gmbh & Co. Belt for papermaking machines
US5427653A (en) * 1991-05-24 1995-06-27 Albany Nord Skafilt Ab Press and method for modifying a press for use in the press section of a papermaking machine
US5196092A (en) * 1991-09-25 1993-03-23 Albany International Corp. Reinforcement of coated surfaces of lnp belts
US6214752B1 (en) * 1997-10-20 2001-04-10 Ichikawa Co., Ltd. Shoe press jacket
US6319365B1 (en) * 1999-09-20 2001-11-20 Ichikawa Co., Ltd Web transfer belt and production process for the same
US7156956B2 (en) * 2003-08-11 2007-01-02 Albany International Corp. Paper industry process belt with a surface structure composed of a porous membrane

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080289716A1 (en) * 2007-05-23 2008-11-27 CROOK Robert Low tensile creep belt
US7513277B2 (en) * 2007-05-23 2009-04-07 Voith Patent Gmbh Low tensile creep belt
US10836536B2 (en) 2016-05-02 2020-11-17 Pro Form Products Ltd. Tap assembly for solvent container
US20220372701A1 (en) * 2019-09-26 2022-11-24 Voith Patent Gmbh Press cover, the use thereof, and the use of a thermoplastic elastomer in the form of a copolymer for a polymer layer of a press cover

Also Published As

Publication number Publication date
EP1574617A1 (de) 2005-09-14
DE102004011665A1 (de) 2005-10-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: STOWE WOODWARD AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DANZLER, FRANZ;REEL/FRAME:016268/0645

Effective date: 20050518

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION