EP0872333A1 - Wellzylinder - Google Patents

Wellzylinder Download PDF

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Publication number
EP0872333A1
EP0872333A1 EP98302997A EP98302997A EP0872333A1 EP 0872333 A1 EP0872333 A1 EP 0872333A1 EP 98302997 A EP98302997 A EP 98302997A EP 98302997 A EP98302997 A EP 98302997A EP 0872333 A1 EP0872333 A1 EP 0872333A1
Authority
EP
European Patent Office
Prior art keywords
roll
corrugating
fluted
corrugated
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.)
Withdrawn
Application number
EP98302997A
Other languages
English (en)
French (fr)
Inventor
Peter Anthony Cartledge
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.)
SCM Corrugator Rolls Ltd
Original Assignee
SCM Corrugator Rolls Ltd
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 SCM Corrugator Rolls Ltd filed Critical SCM Corrugator Rolls Ltd
Publication of EP0872333A1 publication Critical patent/EP0872333A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/20—Corrugating; Corrugating combined with laminating to other layers
    • B31F1/24—Making webs in which the channel of each corrugation is transverse to the web feed
    • B31F1/26—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions
    • B31F1/28—Making webs in which the channel of each corrugation is transverse to the web feed by interengaging toothed cylinders cylinder constructions combined with uniting the corrugated webs to flat webs ; Making double-faced corrugated cardboard
    • B31F1/2845—Details, e.g. provisions for drying, moistening, pressing
    • B31F1/2863—Corrugating cylinders; Supporting or positioning means therefor; Drives therefor

Definitions

  • THIS INVENTION concerns fluted corrugating rolls which in a corrugating machine co-operate with each other to produce a corrugated sheet, and particularly through not exclusively to produce corrugated paper board which may be single or double faced with a plain sheet.
  • a first paper sheet is fed into a nip between upper and lower enmeshed corrugating rolls which are held together under pressure and rotating at, for example, 350 metres per minute, linear speed. Steam is circulated within the corrugating rolls to raise the temperature to approximately 180°C and the corrugated medium is formed by an "ironing" action at the nip.
  • the fluted or corrugated paper is then held to the surface of the second corrugating roll for example by pressure or vacuum, and is, carried close to the surface of a glue roll upon which a film of glue is present.
  • the tips of the formed corrugated paper are dipped into the film of glue on the glue roll before continuing around the second corrugating roll to be then bonded with a flat liner sheet under pressure and heat applied at a further nip between the second corrugating roll and a pressure roll.
  • the so-formed single-faced corrugated board then passes over a heating device to cure the glue.
  • each corrugating roll and its interface, in mesh, with the flutes of the other corrugating roll are arranged conventionally as a compromise to accommodate different paper thicknesses.
  • the actual profile interface between any two rolls is usually appropriate only for one specific thickness of paper but will tolerate different thicknesses within a certain range.
  • Papers of low thickness present a reduced cross-sectional area of paper to cushion the pressure between the two corrugating rolls at the nip or point of formation, the greatest point of pressure being at or about centre line or top dead centre of the profile of one flute. This results in the paper becoming crushed or compacted at the top dead centre of the flute making the formed corrugated paper weaker at each tip and rendering it difficult for glue subsequently to penetrate the paper.
  • a corrugating roll having a curvilinear fluted circumferential surface defining consecutive peaks and troughs, and adapted to be paired in mesh with another such roll to form a nip through which a flat sheet medium may be passed to become corrugated; characterised in that the geometry of the curvilinear fluted roll surface is such as to relieve or reduce pressure applied to the medium by the flute at its centre line relative to that applied by the same flute before and/or after the centre line.
  • each peak of the fluted surface is greater in the region of its top dead centre than elsewhere thereon.
  • each trough of the fluted roll surface is less in the region of its bottom dead centre then elsewhere thereon.
  • Fig. 1 the corrugating rolls 10 and 11 receive between them a first sheet 12 of paper board which is thus corrugated at the nip 13 formed by the enmeshed flutes of the two corrugating rolls 10 and 11.
  • the corrugated board is then carried around the surface of the second corrugating roll 11, the tips of the corrugated board passing through a film 14 (Fig. 5) of glue disposed around the cylindrical surface of the glue roll 15 such that a predetermined quantity of glue is applied along the entire length of each tip of the corrugated board.
  • a plain liner sheet 16 is carried around the pressure roll 17 and passes through a further nip 18 between the second corrugating roll 11 and the pressure roll 17 to be joined by bonding to the glue-faced tips of the corrugated board 12.
  • a single-faced corrugated board 20 is produced and this is subsequently passed over heating means (not shown) to cure the glue.
  • Fig. 2 in a conventional corrugating machine the enmeshed fluted surfaces of the rolls 10 and 11 come together at their closest point at a centre line 21 of a corresponding peak 22 and trough 23 of the fluted surface, whereat considerable pressure is applied to the paper sheet which, thus causes excess compaction thereof.
  • Fig. 3 illustrates in exaggerated form how, conventionally, the maximum pressure is applied at top dead centre with less or no pressure applied to the board in those regions 24 of the profile between the consecutive pairs of peaks and troughs.
  • Fig. 4 in which is illustrated a corrugating roll fluted profile in accordance with the invention, at the top dead centre line 21 the peak 22 of the flute of the second corrugating roll 11 is flattened out at 25 and the corresponding trough 23 between peaks of the corrugating roll 10, may be of increased depth locally at 26.
  • the pressure applied to the paper sheet is relieved or reduced relative to the pressure applied by the same flute in regions 27 and 28 "before and after" top dead centre line, respectively.
  • the enlarged space thus provided by the flattened peaks 22 and, if included, the corresponding deepened troughs 23 prevents the paper from being compressed in that region.
  • the modified peak and trough geometry relieves pressure with the paper about top dead centre of the flute during formation of the corrugated sheet.
  • the high pressure contact area is displaced from top dead centre to two regions 27 and 28 equally spaced on opposite sides of top dead centre 21 and since these two regions 27 and 28 in combination are larger than the single high pressure point with a conventional flute profile, the force exerted on the sheet generally and in a specific region, is reduced, thus in turn reducing damage and crushing of the paper.
  • the relieved peak 22 of each flute has the effect of widening the area of contact between the fluted sheet 12 and the plain sheet 16 at the nip 18.
  • the area has been increased from a single line to a zone illustrated, for example, at 33. If the relieved peak is by way of an actual recess or dimple i.e. a localised reversal of the curvature, this can be selected to match the circumferential form of the pressure roll 17 to achieve, in effect, a rolling action between rolls 11 and 17.
  • the increased surface area of contact at the bonding position reduces pressure lines and increases bond strength.
  • the reduced crush may be achieved by, in effect, flattening (or increasing the radius) or recessing of the peak, or localised deepening (or relieving) of the corresponding trough at or about the same position, or a predetermined combination of the two factors.
  • the essential aspect of the present invention is to replace a single pressure point with pressure areas disposed on opposite sides respectively of the centre line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
EP98302997A 1997-04-19 1998-04-20 Wellzylinder Withdrawn EP0872333A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9707951 1997-04-19
GBGB9707951.1A GB9707951D0 (en) 1997-04-19 1997-04-19 A corrugating roll

Publications (1)

Publication Number Publication Date
EP0872333A1 true EP0872333A1 (de) 1998-10-21

Family

ID=10811039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98302997A Withdrawn EP0872333A1 (de) 1997-04-19 1998-04-20 Wellzylinder

Country Status (2)

Country Link
EP (1) EP0872333A1 (de)
GB (1) GB9707951D0 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6800052B1 (en) 1999-08-12 2004-10-05 Kabushiki Kaisha Isowa Corrugating machine and corrugating roll design for the same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671361A (en) * 1970-11-09 1972-06-20 Harris Intertype Corp Low sound level single facer machine
FR2241657A1 (en) * 1973-08-23 1975-03-21 Harris Intertype Corp One-side covered corrugated cardboard machine - with sound reducing mechanism at the covering station
FR2344401A1 (fr) * 1976-03-17 1977-10-14 Bhs Bayerische Berg Machine pour fabriquer du carton ondule d'un seul cote
EP0098936A1 (de) * 1982-06-16 1984-01-25 Werner H. K. Peters Maschinenfabrik GmbH Einseitige Wellpappenmaschine
EP0577970A2 (de) * 1992-06-05 1994-01-12 Mitsubishi Jukogyo Kabushiki Kaisha Maschine zur Herstellung einseitig gewellter Pappe
EP0681909A2 (de) * 1994-05-13 1995-11-15 Mitsubishi Jukogyo Kabushiki Kaisha Vorrichtung zur Herstellung von Wellenpapier mit einer Deckbahn und Wellzylinder dafür
US5626709A (en) * 1993-11-20 1997-05-06 The Langston Corporation Single facer corrugating roll flute contour

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3671361A (en) * 1970-11-09 1972-06-20 Harris Intertype Corp Low sound level single facer machine
FR2241657A1 (en) * 1973-08-23 1975-03-21 Harris Intertype Corp One-side covered corrugated cardboard machine - with sound reducing mechanism at the covering station
FR2344401A1 (fr) * 1976-03-17 1977-10-14 Bhs Bayerische Berg Machine pour fabriquer du carton ondule d'un seul cote
EP0098936A1 (de) * 1982-06-16 1984-01-25 Werner H. K. Peters Maschinenfabrik GmbH Einseitige Wellpappenmaschine
EP0577970A2 (de) * 1992-06-05 1994-01-12 Mitsubishi Jukogyo Kabushiki Kaisha Maschine zur Herstellung einseitig gewellter Pappe
US5626709A (en) * 1993-11-20 1997-05-06 The Langston Corporation Single facer corrugating roll flute contour
EP0681909A2 (de) * 1994-05-13 1995-11-15 Mitsubishi Jukogyo Kabushiki Kaisha Vorrichtung zur Herstellung von Wellenpapier mit einer Deckbahn und Wellzylinder dafür

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6800052B1 (en) 1999-08-12 2004-10-05 Kabushiki Kaisha Isowa Corrugating machine and corrugating roll design for the same

Also Published As

Publication number Publication date
GB9707951D0 (en) 1997-06-11

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