EP0063890B1 - Method and apparatus for decurling web material - Google Patents

Method and apparatus for decurling web material Download PDF

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Publication number
EP0063890B1
EP0063890B1 EP82301876A EP82301876A EP0063890B1 EP 0063890 B1 EP0063890 B1 EP 0063890B1 EP 82301876 A EP82301876 A EP 82301876A EP 82301876 A EP82301876 A EP 82301876A EP 0063890 B1 EP0063890 B1 EP 0063890B1
Authority
EP
European Patent Office
Prior art keywords
web
steam
shower
source
air foil
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
Application number
EP82301876A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0063890A3 (en
EP0063890A2 (en
Inventor
William James Goetz
Thomas Gerard Engel
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.)
Appvion Operations Inc
Original Assignee
Appleton Papers Inc
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
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Application filed by Appleton Papers Inc filed Critical Appleton Papers Inc
Priority to AT82301876T priority Critical patent/ATE48119T1/de
Publication of EP0063890A2 publication Critical patent/EP0063890A2/en
Publication of EP0063890A3 publication Critical patent/EP0063890A3/en
Application granted granted Critical
Publication of EP0063890B1 publication Critical patent/EP0063890B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs

Definitions

  • This invention relates to a method and apparatus for decurling web material, particularly a web of coated or uncoated paper.
  • the present invention provides in a first aspect a method for decurling a web by substantially uniform application of moisture thereto, comprising the step of subjecting one surface of the web to a steam shower as the web passes thorugh a stream treatment station, the web being free to move under the influence of the force imparted by the steam shower, characterized in that a substantially constant distance is maintained between the web and the source of the steam shower by diercting a gas flow obliquely towards the web from an air foil assembly disposed adjacent the opposite surface of the web from the steam shower, in a manner such that the gas flow is substantially parallel to the web after the gas flow has impinged on the web, the edge of said air foil assembly nearest the source of the steam shower being offset with respect thereto by a distance of approximately 0.0125 m to 0.0190 m (I to inch), so as to be just prior thereto as viewed in the direction of web movement.
  • the present invention provides apparatus for decurling a web by substantially uniform application of moisture thereto, comprising means for passing the web through a steam treatment station and a steam source for providing a steam shower to one surface of the web, characterized in that an air foil assembly is provided adjacent the opposite surface of the web path from the steam source, whereby a substantially constant distance is maintained in use between the web and the steam source, as a result of impingement of the gas flow on the web and subsequent flow of gas parallel to the web, the edge of said air foil assembly nearest the steam source being offset with respect thereto by a distance of approximately 0.0125 m to 0.0190 m (2 to 4 inch), so as to be just prior thereto as viewed in the direction of web movement.
  • the present method and apparatus are particularly suited to the decurling of paper webs, either coated or uncoated.
  • the steam shower is normally directed at the uncoated surface of the web, or, if both web surfaces are coated, at the surface opposite the last-coated surface.
  • the web path is horizontal and the steam shower is directed at the web from beneath the web.
  • the vertical displacement of the web material from the steam source is preferbaly approximately half that from said nearest edge of the air foil assembly to the steam source. This may be achieved by suitable balancing of the air pressure and the steam shower pressure.
  • the preferred air pressure in the airfoil assembly is 1.74 to 2.24 kPa (7-9 inches of water).
  • the preferred steam shower pressure is approximately 34.5 kPa (5 psi), although this is not critical. Steam pressure above about 206.8 kPa (30 psi) should however preferably be avoided.
  • a plurality of steam shower sources and a corresponding number of offset air foil assemblies are provided.
  • the or each steam shower source may be a steam pipe with at least one steam emitting orifice, which is or are normally located along the centre line of the pipe. Such a steam shower source permits the pressure of steam emitted to be varied, so as to facilitate uniform application of moisture to the web being treated.
  • the or each steam shower is preferably located below the web, adjacent to the web surface.
  • the invention stems from the finding that the factors most significant in controlling the curling effect, particularly in relation to paper webs and more especially to coated paper webs, are the distance between the web and the source of the steam shower, the web temperature, the stream pressure and the exhaust level.
  • the present invention permits an efficient regulation of these factors and provides for reliable control of the distance between the web and the source of the steam shower. This minimises any web fluttering effect which might otherwise result from excessive steam pressures and results in more uniform steam application and penetration of the web.
  • billowing is minimised and the necessity for extreme exhaust conditions is eliminated.
  • the invention also permits the use of steam pressures less than would be needed with a comparable conventional method and apparatus.
  • the use of one or more air foil assemblies has the advantage of permitting a constant distance to be maintained between the web and the steam source without the need for contact with the web surface. This reduces the possibility of the surface of the web being impaired or blemished, which is particularly significant where a coated surface is involved, especially if it is a relatively recently coated surface.
  • Use of an air foil assembly also provides a cushioning effect on the web surface in the area immediately above the steam pipe orifice(s). There is also a cooling effect on the web surface since the air film promotes temperature reduction, thus causing more efficient steam condensation.
  • a steam shower decurling apparatus generally indicated 1 comprises a steam shower housing 2 containing two steam pipes 3, 4 having respective orifices 5, 6.
  • the steam shower housing 2 includes exhaust chambers 10.
  • a web 7 When in use, a web 7 is unwound from a feed roll 8, is passed over the steam pipes 3, 4 and is taken up on an idle roll 9. Steam showers issue from the orifices 5, 6 of the steam pipes 3, 4 and impinge on the web 7 as it passes over them. Any excess steam is removed via the exhaust chambers 10.
  • a steam-shower decurling apparatus generally indicated 20 comprises a steam shower housing 21 containing two steam pipes 22, 23 having respective orifices 24, 25. These orifices are disposed along the centre line of their respective pipes 22, 23.
  • the steam shower housing 21 includes exhaust chambers 29 for controlled venting of billowing steam from the steam pipes 22, 23.
  • Each air foil assembly comprises an air foil housing 33, 34 and an air supply duct 35, 36.
  • the ducts 35, 36 are attached to a remote air blower (not shown).
  • Each air foil housing has an outlet 37 arranged so as to direct air obliquely towards the web, with the result that the air flow is parallel to the web.
  • air foil assemblies of this kind gives rise to a Venturi effect (as witnessed at the surface of an aeroplane wing).
  • the air emitted through the outlet 37 establishes a uniform air flow or film pattern directed parallel to the web surface and this prevents contact of the web with the air foil assemblies whilst at the same time maintaining the web at a constant distance from the air foil assemblies, and thus also from the steam shower assemblies.
  • Each air foil assembly 33, 34 is positioned or offset such that its edge nearest its respective steam pipe 22, 23 is just before the orifice 24, 25 or centre line thereof, as viewed in the direction of web movement.
  • the extent of the offset is indicated as I and is approximately 0.0125 m to 0.0190 m H to 4 inch).
  • the vertical displacement between each air foil assembly and its respective steam pipe is indicated as d.
  • a web 26 When in use, a web 26 is unwound from a feed roll 27, is passed between the air foil assemblies 33, 34 and the steam pipes 22, 23 and is taken up on an idle roll 28.
  • the air foil pressure is maintained such that the web floats uniformly between the air foil assemblies 33, 34 and the steam pipes 22, 23, with the result that the distance between the steam pipe orifices 24, 25 and the web material 26 is maintained substantially constant at a value approximately half the vertical displacement d between each air foil assembly and its respective steam pipe.
  • the offset of the air foil assemblies 33, 34 with respect to the steam pipes 22, 23 minimises the possibility of damage to the web due to high steam pressures.
  • the use of air foils provides a cushioning effect on the web in the area immediately above the steam pipes.
  • the upper surface of the web does not actually contact the air foil assemblies, which is especially significant when the upper surface of the web carries a coating, since the possibility of impairing the web surface is reduced.
  • the steam pressure employed in the apparatus of Fig. 2 is generally about 34.5 kPa (5 psi) and is preferably not greater than 206.8 kPa (30 psi).
  • Fig. 2 does not utilise electrostatic means for guiding moisture to be applied to the web.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Paper (AREA)
  • Glass Compositions (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Advancing Webs (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Metal Rolling (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Undergarments, Swaddling Clothes, Handkerchiefs Or Underwear Materials (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Soil Working Implements (AREA)
  • Coating Apparatus (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
EP82301876A 1981-04-27 1982-04-08 Method and apparatus for decurling web material Expired EP0063890B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82301876T ATE48119T1 (de) 1981-04-27 1982-04-08 Verfahren und apparat zum glaetten einer bahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25794681A 1981-04-27 1981-04-27
US257946 1981-04-27

Publications (3)

Publication Number Publication Date
EP0063890A2 EP0063890A2 (en) 1982-11-03
EP0063890A3 EP0063890A3 (en) 1982-12-22
EP0063890B1 true EP0063890B1 (en) 1989-11-23

Family

ID=22978462

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82301876A Expired EP0063890B1 (en) 1981-04-27 1982-04-08 Method and apparatus for decurling web material

Country Status (13)

Country Link
EP (1) EP0063890B1 (no)
JP (1) JPS57184053A (no)
AT (1) ATE48119T1 (no)
AU (1) AU8262482A (no)
BR (1) BR8202319A (no)
CA (1) CA1172863A (no)
DE (1) DE3280031D1 (no)
DK (1) DK185382A (no)
ES (1) ES8400678A1 (no)
FI (1) FI821430L (no)
GR (1) GR75420B (no)
NO (1) NO821358L (no)
ZA (1) ZA822626B (no)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672063B1 (fr) * 1991-01-25 1993-06-04 Champagne Teinturerie Dispositif d'entrainement de produits textiles dans une machine textile.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627667A (en) * 1946-10-07 1953-02-10 Joseph R Gillis Method and apparatus for drying inks
GB732558A (en) * 1951-08-20 1955-06-29 Joseph Monforts Improvements in and relating to driers operating in conjunction with printing machines
US2797074A (en) * 1955-04-28 1957-06-25 John H Flynn Operating controls for print-drying apparatus
US3453742A (en) * 1967-09-26 1969-07-08 Nat Distillers Chem Corp Apparatus for drying printing ink on plastic film
US3467541A (en) * 1965-11-23 1969-09-16 Svenska Flaektfabriken Ab Method and apparatus for moisturizing web material
FR2397221A1 (fr) * 1977-07-11 1979-02-09 Bobst Fils Sa J Procede et dispositif de traitement des solvants degages par les presses d'impression

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH344813A (de) * 1956-08-07 1960-02-29 Alpura Ag Vorrichtung zum Befeuchten einer laufenden biegsamen Materialbahn
GB933636A (en) * 1960-03-10 1963-08-08 Hall & Kay Ltd Improvements in or relating to apparatus for treating or conditioning webs or sheetsof paper, cloth, plastics or a like material
GB1156056A (en) * 1967-05-03 1969-06-25 Greenbank Engineering Company Method and Apparatus for Adding Moisture to a Pre-Conditioned Web of Paper.
ES368019A1 (es) * 1968-05-28 1971-05-01 Fuji Photo Film Co Ltd Perfeccionamientos en las maquinas para el tratamiento de materiales en hojas y similares.
IT951025B (it) * 1971-04-28 1973-06-30 Monforts Fa A Impianto per la guida ed il traspor to allo stato flottante di materia le a nastro esteso in larghezza
SE393826B (sv) * 1974-05-29 1977-05-23 Svenska Flaektfabriken Ab Anordning for att vid transport av ett ban- eller arkformigt av luft uppburet material, framfora materialet i ett fixerat stabilt svevlege genom en eller flera etager av en behandlingsanleggning, foretredesvis en ...
US4201323A (en) * 1978-10-12 1980-05-06 W. R. Grace & Co. High velocity web floating air bar having a recessed Coanda plate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2627667A (en) * 1946-10-07 1953-02-10 Joseph R Gillis Method and apparatus for drying inks
GB732558A (en) * 1951-08-20 1955-06-29 Joseph Monforts Improvements in and relating to driers operating in conjunction with printing machines
US2797074A (en) * 1955-04-28 1957-06-25 John H Flynn Operating controls for print-drying apparatus
US3467541A (en) * 1965-11-23 1969-09-16 Svenska Flaektfabriken Ab Method and apparatus for moisturizing web material
US3453742A (en) * 1967-09-26 1969-07-08 Nat Distillers Chem Corp Apparatus for drying printing ink on plastic film
FR2397221A1 (fr) * 1977-07-11 1979-02-09 Bobst Fils Sa J Procede et dispositif de traitement des solvants degages par les presses d'impression

Also Published As

Publication number Publication date
DE3280031D1 (en) 1989-12-28
JPH0329707B2 (no) 1991-04-25
EP0063890A3 (en) 1982-12-22
EP0063890A2 (en) 1982-11-03
CA1172863A (en) 1984-08-21
GR75420B (no) 1984-07-16
ES511697A0 (es) 1983-11-01
ES8400678A1 (es) 1983-11-01
FI821430A0 (fi) 1982-04-23
JPS57184053A (en) 1982-11-12
FI821430L (fi) 1982-10-28
ATE48119T1 (de) 1989-12-15
ZA822626B (en) 1983-03-30
NO821358L (no) 1982-10-28
AU8262482A (en) 1982-11-04
BR8202319A (pt) 1983-04-05
DK185382A (da) 1982-10-28

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