EP0700470B1 - Pressing arrangement for a moving web - Google Patents

Pressing arrangement for a moving web Download PDF

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Publication number
EP0700470B1
EP0700470B1 EP93919793A EP93919793A EP0700470B1 EP 0700470 B1 EP0700470 B1 EP 0700470B1 EP 93919793 A EP93919793 A EP 93919793A EP 93919793 A EP93919793 A EP 93919793A EP 0700470 B1 EP0700470 B1 EP 0700470B1
Authority
EP
European Patent Office
Prior art keywords
belt
press
roll
web
pressing arrangement
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
EP93919793A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0700470A1 (en
Inventor
Erik Nykopp
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.)
Individual
Original Assignee
Individual
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
Priority claimed from SE19939301802A external-priority patent/SE9301802D0/sv
Application filed by Individual filed Critical Individual
Publication of EP0700470A1 publication Critical patent/EP0700470A1/en
Application granted granted Critical
Publication of EP0700470B1 publication Critical patent/EP0700470B1/en
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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • 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
    • 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
    • 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
    • D21F3/0281—Wet presses in combination with a dryer roll
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/0066—Calenders; Smoothing apparatus using a special calendering belt

Definitions

  • the present invention concerns a pressing arrangement for a moving web in accordance with the preamble of claim 1.
  • the unit is principally intended for surface finishing of fiber mats such as paper or board which under pressure pass between the press roll and the moving belt.
  • the press roll is heated to a temperature of at least 100° Celcius.
  • a calendering arrangement is known from DE 3632692 A wherein a web is transported thru a calender nip formed between two rolls where both rolls are controllably driven and a soft belt encloses one of the rolls.
  • An "ironing" action is achieved on the web by pressing the rolls very lightly against each other and driving them at different speeds so as to produce a satinating effect thru friction.
  • This arrangement the surface improvement of the web is obtained solely thru a speed difference and frictional polishing action between the web and the roll facing the web.
  • One main purpose wih the present invention is to achieve a pressing arrangement of the general type indicated in the introduction wherein the moving web is pressed against the press roll with a uniform pressure independent of variations in the thickness of the moving web. Another purpose is to achieve effective cooling of the belt. A further purpose is to provide the possibility of preheating the web in a controlled manner prior to the press zone.
  • the invented pressing arrangement has the characterizing features set fort in the main claim. In this manner one obtains a smooth and uniform web surface on the side facing the press roll, irrespective of variations in the thickness of the web.
  • the moving web is subjected to pressure in the press zone formed between a press roll and an elastic belt which is supported by a roll of suitable diameter or a stationary glide body or shoe.
  • average unit pressures in the press zone have to be relatively high, i.e. a minimum of approximately 2 MPa and the surface temperature of the press roll at least 100° Celsius, preferably between 150 and 250°C.
  • the web facing side of the belt would be surface finished to a roughness of typically 2 microns but importantly to a finish which yields a more uniform surface structure than that of the side of the web in contact with it in the press zone, e.g. at least the same, suitably 50%, preferably 25%, and especially 10% of the average pore size of the web.
  • the high unit pressures in the press zone cause the smooth elastic belt to follow the contour of the less uniform side of the web facing it, thus resulting in a very even pressure on the web. As a cosequence this will enhance the uniformity and evenness of the pressing action on the side of the web facing the press roll.
  • the pressing action would typically cause a minimum thickness reduction in the belt equal to about 3% in the middle of the press zone. This would normally represent an indentation which is considerably more than the deepest nonuniformity in typical paper or board.
  • the cooling action on the backside of the moving belt by means of coolant in the supporting counter body protects the belt from overheating in the middle where where the reinforcing structure normally is located.
  • the moving web is pressed against the heated press roll by the moving belt following said roll ahead of the press zone.
  • This pressure is a function of the tension in the belt and can thus be considerable depending on the physical properties of the belt and certainly much higher than if the moving web alone (without the belt) would be contacting the press roll.
  • It is also desirable to control the time of contact (preheating) prior to the press zone which can be done by adjusting the guide roll guiding the belt ahead of the press zone.
  • the supporting counter body constitutes a cylindrical roll and thus the inside of the belt, facing this roll, could have a relatively nonuniform surface as said surface contacts a moving surface (roll) instead of sliding over stationary parts in the press zone.
  • a desired length of the press zone can further be achieved by selecting a proper diameter for the roll. The bigger the diameter of both the press roll and the counter roll, the longer will be the press zone.
  • the length of the press zone is also a function of the elasticity and thickness of the moving belt which encloses the counter roll. In practice, the length of the press zone can be between approximately 1 and 10 centimeters.
  • the indentation in the belt could then be about 1 mm.
  • the surface roughness of the side of the belt facing the web is suitably 5 microns, preferably 2 microns, and most preferably 1 micron.
  • the counter roll could be cooled by water whereas oil, circulating in a closed loop including an oil cooler, could preferentially be utilized when the supporting counter body constitutes a glide shoe or glide body.
  • Fig. 1 shows a pressing arrangement for a moving web, formed between a cylindrical press roll 1 and a belt 5 supported by a counter body constituting a roll 2.
  • a moving web 6 is passed between the rotating press roll and the moving belt.
  • a guide roll 3 and a stretch roll 4 are provided for guiding the belt and maintaining it under proper tension.
  • the press and counter rolls are forced against eachother by arbitrary, known loading mechanisms not shown here, thus producing the press zone 7.
  • the press roll is heated to a temperature of at least 100°C.
  • the counter roll can be cooled by known means not shown here.
  • the counter body constitutes a glide body 9 which is supported by a beam 15.
  • a lubricating duct 10 and lubricating nozzles 12 are provided for lubricating the area between the glide body 9 and the moving belt 5.
  • a duct 13 is indicated for a cooling fluid which transfers heat within a closed loop including a heat exchanger.
  • Arbitrary, known loading mechanisms for applying load between the press roll and the glide body are not shown here.
  • the glide body can be adjusted from the end flanges 50 as indicated by the arrows 52.
  • the moving web 6 passes between the press roll 1 and the moving belt 5 in the press zone 7.
  • an adjustable 14 guide roll 16 is shown and has been included for the purpose of obtaining a preheating zone 8 of variable length prior to the press zone 7.
  • the moving belt 5 encloses guide roll 16. With the exception of this guide roll the arrangement is similar to that shown in fig. 1.

Landscapes

  • Paper (AREA)
  • Press Drives And Press Lines (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Finger-Pressure Massage (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
EP93919793A 1993-05-27 1993-09-08 Pressing arrangement for a moving web Expired - Lifetime EP0700470B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9301802 1993-05-27
SE19939301802A SE9301802D0 (sv) 1992-09-09 1993-05-27 Press arrangement for a moving web
PCT/SE1993/000730 WO1994028239A1 (en) 1993-05-27 1993-09-08 Pressing arrangement for a moving web

Publications (2)

Publication Number Publication Date
EP0700470A1 EP0700470A1 (en) 1996-03-13
EP0700470B1 true EP0700470B1 (en) 2000-03-22

Family

ID=20390063

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919793A Expired - Lifetime EP0700470B1 (en) 1993-05-27 1993-09-08 Pressing arrangement for a moving web

Country Status (10)

Country Link
EP (1) EP0700470B1 (sv)
JP (1) JP2899414B2 (sv)
KR (1) KR960703446A (sv)
AT (1) ATE191023T1 (sv)
BR (1) BR9307856A (sv)
CA (1) CA2163532A1 (sv)
DE (1) DE69328199T2 (sv)
FI (1) FI111090B (sv)
PL (1) PL171819B1 (sv)
WO (1) WO1994028239A1 (sv)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5400707A (en) * 1992-10-09 1995-03-28 Champion International Corporation Apparatus for finishing a continuous sheet of paper
US6007921A (en) * 1992-10-09 1999-12-28 Champion International Corporation Continuous finishing belt capable of finishing surface of a web of paper
EP0805896B1 (en) * 1995-01-10 1999-10-20 The Procter & Gamble Company High density tissue and process of making
WO1996021768A1 (en) * 1995-01-10 1996-07-18 The Procter & Gamble Company Smooth, through air dried tissue and process of making
US6821386B2 (en) 1995-01-10 2004-11-23 The Procter & Gamble Company Smooth, micropeak-containing through air dried tissue
US6551453B2 (en) 1995-01-10 2003-04-22 The Procter & Gamble Company Smooth, through air dried tissue and process of making
FI101985B1 (sv) * 1996-12-10 1998-09-30 Valmet Corp Förfarande och anordning för torkning av fiberbana
FI102304B1 (sv) * 1997-04-02 1998-11-13 Valmet Corp Kalandreringsförfarande och kalander för tillämpning av förfarandet
FI102305B1 (sv) * 1997-04-02 1998-11-13 Valmet Corp Kalandreringsförfarande och kalander för tillämpning av förfarandet
US6203307B1 (en) * 1997-08-28 2001-03-20 Champion International Corporation System for finishing surface of a web of paper having an improved continuous finishing belt
WO1999023305A1 (en) * 1997-10-31 1999-05-14 Beloit Technologies, Inc. Soft nip calender
US6287424B1 (en) 1998-09-22 2001-09-11 International Paper Company Method for finishing paperboard to achieve improved smoothness
US6332953B1 (en) 1998-10-02 2001-12-25 International Paper Company Paper product having enhanced printing properties and related method of manufacture
US6190500B1 (en) 1998-10-02 2001-02-20 International Paper Company Multilayer linerboard having improved printing properties and related method of manufacture
US6946186B2 (en) 2002-08-24 2005-09-20 International Paper Co. Uncoated facestock for adhesive-backed labels
CN101694076A (zh) 2003-05-13 2010-04-14 王子制纸株式会社 造纸机的压榨装置和造纸方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI74065C (sv) * 1985-10-04 1987-12-10 Waertsilae Oy Ab Kalander, t.ex. superkalander
ATE125893T1 (de) * 1991-01-24 1995-08-15 Erik Nykopp Pressanordnung für eine fortlaufende bahn.

Also Published As

Publication number Publication date
CA2163532A1 (en) 1994-12-08
KR960703446A (ko) 1996-08-17
FI955672A0 (sv) 1995-11-24
EP0700470A1 (en) 1996-03-13
JPH08510014A (ja) 1996-10-22
JP2899414B2 (ja) 1999-06-02
WO1994028239A1 (en) 1994-12-08
ATE191023T1 (de) 2000-04-15
BR9307856A (pt) 1996-01-16
FI955672A (sv) 1995-11-24
PL311744A1 (en) 1996-03-18
DE69328199T2 (de) 2000-10-05
DE69328199D1 (de) 2000-04-27
PL171819B1 (pl) 1997-06-30
FI111090B (sv) 2003-05-30

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