EP0194602B1 - EIne Methode zur Herstellung eines endlosen Bandes mit glatter Innenoberfläche zur Verwendung für eine Walze mit verlängertem Prepspalt zur Papierherstellung - Google Patents

EIne Methode zur Herstellung eines endlosen Bandes mit glatter Innenoberfläche zur Verwendung für eine Walze mit verlängertem Prepspalt zur Papierherstellung Download PDF

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Publication number
EP0194602B1
EP0194602B1 EP86103042A EP86103042A EP0194602B1 EP 0194602 B1 EP0194602 B1 EP 0194602B1 EP 86103042 A EP86103042 A EP 86103042A EP 86103042 A EP86103042 A EP 86103042A EP 0194602 B1 EP0194602 B1 EP 0194602B1
Authority
EP
European Patent Office
Prior art keywords
belt
mold
polymer
fabric
mandrel
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.)
Expired - Lifetime
Application number
EP86103042A
Other languages
English (en)
French (fr)
Other versions
EP0194602A1 (de
Inventor
William H. Dutt
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.)
Albany International Corp
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Albany International Corp
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Filing date
Publication date
Application filed by Albany International Corp filed Critical Albany International Corp
Priority to AT86103042T priority Critical patent/ATE54347T1/de
Publication of EP0194602A1 publication Critical patent/EP0194602A1/de
Application granted granted Critical
Publication of EP0194602B1 publication Critical patent/EP0194602B1/de
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
    • D21F3/0209—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

  • This invention relates to a method for producing an endless belt with a smooth inner surface for use in an extended press nip for dewatering a fibrous web formed in a papermaking machine.
  • a web is formed by depositing a fibrous slurry on a forming wire. A large amount of water is drained from the slurry during this process, after which the newly-formed web proceeds to a press section which includes a series of press nips. The web finally proceeds to a drying section including heated dryer drums where the water content is reduced to a desirable level.
  • the web is sandwiched between two moisture absorbing felts.
  • the felts are trained around a cylindrical press roll with the web between them while a belt is arranged to transfer the pressure exerted by a pressure shoe to the felts and roll.
  • the belt is provided with a very smooth surface for contacting the shoe so that it can transfer pressure to the felts and the fibrous web without overheating or wearing away. Furthermore the belt must be impermeable to oil used to lubricate its passage over the shoe which could contaminate the felts and the web.
  • the belt was made by applying a polymer coating to the outer surface of an endless fabric. Since the belt is arranged so that its inner surface is the shoe-contacting surface, the endless coated fabric is then reversed (i.e. turned inside out). While this procedure was satisfactory for belts having a length of 7.4 m (24 feet) or more it has been found that it is difficult to reverse belts having a length of less than 7.4 m. Furthermore it was found that it was difficult to apply the coating to the outer surface of shorter belts.
  • GB-A 2 106 557 shows a belt which is impregnated on only one side, that which comes into direct contact with the shoe. The other side is left unimpregnated and, as a consequence, provided voids for the temporary storage of water pressed from the wet paper sheet.
  • the endless fabric from which the belt is made is stretched between two rollers and coated on the inside. Yet the coated surface still has to be ground smooth. No mandrel is used for the manufacture of the known belt.
  • DE-A 3 318 984 teaches to pour a liquid polymer onto the moving fabric base held under tension.
  • the base fabric is placed on a rotating cylinder, and the liquid polymer material is then applied to the fabric by means of a nozzle which travels back and forth parallel to the cylinder axis.
  • the centrifugal force arising from the rotational motion of the cylinder would act to oppose the impregnation of the fabric by the polymer if the cylinder were to rotate too quickly. It would also appear that applying the liquid polymer material onto the fabric base with a nozzle would introduce air bubbles into the polymer.
  • An extended press is provided for dewatering a travelling web of material.
  • the nip 10 is defined by a cylindrical press roll 12, a pressure shoe 14 having an arcuate surface facing the press roll, and a belt 16 arranged such that it bears against the surface of the press roll.
  • the arcuate surface of the pressure shoe has about the same radius of curvature as the press roll.
  • the distance between the press roll and the pressure shoe may be adjusted by means of conventional hydraulic or mechanical apparatus (not shown) connected to a rod 18 pivotally secured to the shoe 14. The rod may also be actuated to apply the desired pressure to the shoe.
  • the pressure shoe and press roll described above as shown in Figures 1-2 are conventional and that other arrangements are also well known in the art.
  • Paper web 24 is carried to and away from the nip by a first felt 26.
  • a second felt 28 is used to absorb the water expressed from web 24 in the nip.
  • a lubricating means 30 is used to apply a lubricant such as oil to the inner surface 16' of belt 16 to further reduce friction between said inner surface and shoe 14.
  • the belt is entrained by rollers 32 used to drive the belt in a predetermined path as shown.
  • the belt 16 employed in accordance with the invention is shown in detail in Figure 3. It has proven to be superior to belts currently known to the art both from an operational standpoint and for manufacturing considerations.
  • the belt 16 comprises a base fabric 34 which is impregnated with a polymeric material 36.
  • Thermosetting resins such as polyurethanes have been found to be suitable impregnating materials. Preferably a 100% polyurethane resin should be used to avoid formation of bubbles during the curing of the belt structure.
  • Thermoplastic polymers such as polypropylene are also acceptable.
  • the base fabric 34 is sufficiently open to allow total impregnation. This eliminates the possibility of any voids forming in the final fabric which would allow the lubrication used between the belt and shoe to pass through the belt and contaminate the felt and fibrous web. It is endless in final construction and uniform in thickness.
  • the fabric must also be made to have sufficient stability under paper machine conditions. In other words, it must have length stability, width stability, and guideability.
  • the base fabric may comprise a single or multilayered flat woven fabric which has been heat stabilized and joined using normal joining techniques.
  • the base fabric may be made of polyester or other polymeric materials having the necessary properties in accordance with the invention.
  • the base may be made endless by endless weaving also.
  • At least one of the sides or surfaces of the belt, such as side 16', is smooth for contacting the pressure shoe 14.
  • Belts manufactured in accordance with the invention have been found to have many desirable characteristics. They move easily over the pressure shoe and are capable of transmitting pressure from the shoe to the web and press roll. Sufficient flexibility is obtained, and the belts have proven to be unaffected by lubricant applied prior to entering the press nip.
  • the belt is manufactured in a cylindrical mold 38 ( Figure 4) with an outer shell 39 and a concentric mandrel 42.
  • the mandrel is provided with a smooth outer surface 40.
  • the spacing between the outer shell 39 of the mold and the inner mandrel determines the thickness or caliper of the belt.
  • the base fabric 34 is first placed on the smooth mandrel surface 40 and then the mold 38 is hermetically sealed with cover 44.
  • the pressure within the mold is reduced by substantially removing the air contained therein via a pipe 46 connected to a vacuum source (not shown).
  • an appropriate polymer is injected into the mold through pipe 48. Because of the low pressure inside the mold, the polymer quickly fills the mold including the interstices of the fabric.
  • a smooth inner polymer surface is formed along the mandrel surface 40.
  • the polymer is cross-linked by applying heat to the mold. After the polymer has cured the finished belt may be removed from the mold.
  • a polymer catalyst mixture may be used which is self cross linking if left undisturbed several hours.
  • the resulting belt is shown in Figure 3, with the fabric 34 being fully impregnated with and impermeable to oil and other substances.
  • the belt has a uniform caliper as a result of the molding operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paper (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Making Paper Articles (AREA)
  • Belt Conveyors (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)

Claims (5)

1. Verfchren zur Beschichtung eines Textilerzeugnisses für ein Endlos-Band zur Herstellung eines Endlos-Bandes mit einer glatten Innenfläche für eine Papiermaschinenpresse mit verlängertem Preßspalt, dadurch gekennzeichnet, daß
a) ein als Basis dienendes, endloses, offenes Textilerzeugnis bereitgestellt,
b) eine zylindrische, hermetisch abdichtbare Form mit einem glatten Dorn und einer gleichmäßig beabstandeten äußeren Hülle vorgesehen,
c) das endlose Textilerzeugnis innerhalb der Form auf den Dorn aufgebracht,
d) die Form durch eine Unterdruckquelle evakuiert, und
e) ein Polymer in den Raum zwischen dem Dorn und der Hülle eingespritzt wird, um das offene Textilerzeugnis durchgehend zu tränken, und das Polymer vernetzt wird.
2. Verfahren nach Anspruch 1, wobei die Form in stationärem Zustand gehalten wird.
3. Verfahren nach Anspruch 1, wobei das Polymer direkt in den besagten Raum mittels eines Zuführungsrohres eingespritzt wird, das einen Auslaß hat und in dem gleichmäßigen breiten Bereich zwischen dem glatten Dorn und der äußeren Hülle angeordnet ist.
4. Verfahren nach Anspruch 1, wobei der Form Hitze zugeführt wird, um das Polymer zu vernetzen.
5. Verfahren nach Anspruch 1, wobei die Basis ein gewebtes Material ist.
EP86103042A 1985-03-13 1986-03-07 EIne Methode zur Herstellung eines endlosen Bandes mit glatter Innenoberfläche zur Verwendung für eine Walze mit verlängertem Prepspalt zur Papierherstellung Expired - Lifetime EP0194602B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103042T ATE54347T1 (de) 1985-03-13 1986-03-07 Eine methode zur herstellung eines endlosen bandes mit glatter innenoberflaeche zur verwendung fuer eine walze mit verlaengertem prepspalt zur papierherstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71145485A 1985-03-13 1985-03-13
US711454 1985-03-13

Publications (2)

Publication Number Publication Date
EP0194602A1 EP0194602A1 (de) 1986-09-17
EP0194602B1 true EP0194602B1 (de) 1990-07-04

Family

ID=24858156

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103042A Expired - Lifetime EP0194602B1 (de) 1985-03-13 1986-03-07 EIne Methode zur Herstellung eines endlosen Bandes mit glatter Innenoberfläche zur Verwendung für eine Walze mit verlängertem Prepspalt zur Papierherstellung

Country Status (10)

Country Link
EP (1) EP0194602B1 (de)
JP (1) JPS61258715A (de)
AT (1) ATE54347T1 (de)
BR (1) BR8506360A (de)
CA (1) CA1282270C (de)
DE (1) DE3672359D1 (de)
FI (1) FI86315C (de)
MX (1) MX162003A (de)
NO (1) NO167097C (de)
ZA (1) ZA859176B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816004A1 (de) * 1987-08-07 1989-02-16 Albany Int Corp Verfahren zur herstellung eines bandes fuer die papierherstellung
US6752908B2 (en) 2001-06-01 2004-06-22 Stowe Woodward, Llc Shoe press belt with system for detecting operational parameters

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201978A (en) * 1988-04-08 1993-04-13 Beloit Technologies, Inc. Method of fabricating a blanket for an extended nip press
DE3909935C2 (de) * 1989-03-25 1995-04-27 Oberdorfer F Siebtech Gmbh Verfahren und Vorrichtung zum Herstellen eines undurchlässigen und biegsamen Bandes oder Schlauches
JPH06287885A (ja) 1991-04-15 1994-10-11 Yamauchi Corp 脱水プレス用エンドレスベルト
SE468483B (sv) * 1991-05-24 1993-01-25 Nordiskafilt Ab Press samt saett att modifiera en press foer pressektionen i en pappersmaskin eller liknande
US5792323A (en) * 1995-09-07 1998-08-11 Albany International Corp. Spiral base structres for long nip paper machine press belts
DE19537182A1 (de) * 1995-10-06 1997-04-10 Wuertt Filztuchfab Preßvorrichtung mit verlängerter Preßzone
EP1251203B1 (de) * 2001-04-18 2007-06-13 Stowe Woodward Aktiengesellschaft Schuhpressenbelt
US7014733B2 (en) 2002-05-14 2006-03-21 Stowe Woodward L.L.C. Belt for shoe press and shoe calender and method for forming same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133157A (ja) * 1974-09-13 1976-03-22 Bando Chemical Ind Shoonseimasatsudendoberuto no seizohoho
DE2844907C3 (de) * 1978-10-14 1981-08-13 Fa. Carl Freudenberg, 6940 Weinheim Verfahren zur Herstellung eines Lieferwerksriemchens
FR2513281B1 (fr) * 1981-09-24 1985-07-26 Albany Int Corp Presse pour extraire l'eau d'une pate a papier et procede de fabrication d'une courroie pour une telle presse
JPS5954598U (ja) * 1982-10-01 1984-04-10 市川毛織株式会社 抄紙機の広巾ニツププレス用加圧ベルト
JPS59100789A (ja) * 1982-12-02 1984-06-11 アルバニ−・インタナシヨナル・コ−ポレ−シヨン 脱水プレス
JPS59192794A (ja) * 1983-04-15 1984-11-01 市川毛織株式会社 抄紙機の面圧ニツププレス用加圧ベルト及びその製造方法
DE3318984A1 (de) * 1983-05-25 1984-11-29 Fa. F. Oberdorfer, 7920 Heidenheim Herstellungsverfahren fuer zugfeste, undurchlaessige, biegsame baender insbesondere fuer pressen zum entwaessern von faserstoffbahnen
JPH07101698B2 (ja) * 1989-07-25 1995-11-01 日本電気株式会社 樹脂封止型半導体装置の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3816004A1 (de) * 1987-08-07 1989-02-16 Albany Int Corp Verfahren zur herstellung eines bandes fuer die papierherstellung
US6752908B2 (en) 2001-06-01 2004-06-22 Stowe Woodward, Llc Shoe press belt with system for detecting operational parameters

Also Published As

Publication number Publication date
FI86315B (fi) 1992-04-30
JPS61258715A (ja) 1986-11-17
FI855023A (fi) 1986-09-14
NO860939L (no) 1986-09-15
FI855023A0 (fi) 1985-12-17
CA1282270C (en) 1991-04-02
BR8506360A (pt) 1986-12-09
DE3672359D1 (de) 1990-08-09
NO167097C (no) 1991-10-02
FI86315C (fi) 1992-08-10
ATE54347T1 (de) 1990-07-15
NO167097B (no) 1991-06-24
JPH0357236B2 (de) 1991-08-30
ZA859176B (en) 1986-08-27
MX162003A (es) 1991-03-20
EP0194602A1 (de) 1986-09-17

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