EP0060113A1 - Méthode de couchage d'une feuille de support - Google Patents

Méthode de couchage d'une feuille de support Download PDF

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Publication number
EP0060113A1
EP0060113A1 EP82301148A EP82301148A EP0060113A1 EP 0060113 A1 EP0060113 A1 EP 0060113A1 EP 82301148 A EP82301148 A EP 82301148A EP 82301148 A EP82301148 A EP 82301148A EP 0060113 A1 EP0060113 A1 EP 0060113A1
Authority
EP
European Patent Office
Prior art keywords
sheet
dispersion
coating
paper
microcapsules
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Withdrawn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
EP82301148A
Other languages
German (de)
English (en)
Inventor
Nicholas J.B. Jones
Hugh Higgins
Thomas Galloway Green
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.)
DRG UK Ltd
Original Assignee
DRG UK 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10520326&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0060113(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by DRG UK Ltd filed Critical DRG UK Ltd
Publication of EP0060113A1 publication Critical patent/EP0060113A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/10—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
    • B41M5/1246—Application of the layer, e.g. by printing
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape
    • D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H5/00—Special paper or cardboard not otherwise provided for
    • D21H5/0005—Processes or apparatus specially adapted for applying liquids or other fluent materials to finished paper or board, e.g. impregnating, coating
    • D21H5/006—Controlling or regulating
    • D21H5/0062—Regulating the amount or the distribution, e.g. smoothing, of essentially fluent material already applied to the paper; Recirculating excess coating material applied to paper
    • D21H5/0065—Regulating the amount or the distribution, e.g. smoothing, of essentially fluent material already applied to the paper; Recirculating excess coating material applied to paper with blades

Definitions

  • This invention relates to a method of coating a support sheet especially but not exclusively for coating paper.
  • excess solution or dispersion is preferably removed prior to drying.
  • This can be achieved in a variety of ways, for example by air-knife or by coating the sheet by roller, but the most preferable manner of removing the excess liquid from a face of the coated sheet is by feeding the sheet past a fixed blade so that the coating depth on that face is controlled by contact with the blade.
  • the blade is preferably flexible and may be biassed towards the sheet, as in this way it not only controls the depth of coating but also spreads the coating evenly and smoothly across the sheet's face. Once dried the coated sheet then has a smoother finish than with an air-knife technique.
  • the blade may act in conjunction with a roller so that the coating depth is controlled on both faces simultaneously, the coated sheet passing through the nip between the blade and roller, or a pair of blades may be provided between whch the coated sheet passes.
  • An especially effective method is where coating heads apply the solution or dispersion to each face of the sheet as it passes upwardly past the heads, and the coated sheet then continues upwardly between a pair of flexible blades whose edges are biassed towards one another so that excess liquid is removed from the coated sheet and falls downwards for collection and recycling to the coating heads.
  • Blades can be used on faces of the sheet which are coated without microcapsules, or with microcapsules whose walls are strong enough to withstand the mechanical forces imposed by the blades.
  • the microcapsules have walls of hydrophobic material, for example synthetic polymers, rather than hydrophilic material such as gelatin. Hydrophobic materials retain their inherent strength when exposed to water whereas gelatin and the like materials swell with resulting weakening of the microcapsule walls and rupture on contact with the blades.
  • Suitable examples of polymers for use in manufacture of the microcapsule walls are polyurea, polyamide, urea-formaldehyde, melamine-formaldehyde, polyurethane, polyester, epoxy resin and polyvinyl acetate.
  • blades are of considerable value also in allowing a much higher solids content of the microcapsule dispersion coated on the support sheet than is possible with the conventional air-knife technique.
  • the single drying stage for the coatings on each face of the sheet in the method of this invention allows considerable savings in energy, this can be enhanced by the use of smaller quantities of water in the blade coating technique.
  • the feed rate of the support sheet can be increased and the amount of drying equipment can be reduced.
  • the present invention makes it possible for increased efficiency, lower capital outlay and lower running costs to be obtained.
  • a method of coating a support sheet comprising feeding the support sheet past coating means to apply a solution of dispersion of coating material to opposite faces of the sheet, the coating material applied to at least one of the faces of the sheets comprising microcapsules, and passing the coated sheet through drying means thereby concurrently to deposit the coating material from solution or dispersion onto both faces of the sheet.
  • a major advantage accruing from applying a wet coating to both faces simultaneously is that "curl" is eliminated without adding to the amount of water which eventually must be driven off.
  • driers which operate by subjecting the wet substrate to hot air.blast from jets in the form of nozzles or slots arranged along both sides of the coated sheet.
  • the sheet passes between the jets without contacting the walls, and drying can thus be effected very rapidly and without disturbing the evenness of the coatings by solid contact.
  • Any changes in direction of the wet coated sheet can be achieved by passing the sheet round an "air roll" whose surface has a cushion of air on which the sheet runs, so that again the wet coating is not disturbed.
  • the method of this invention is of particular benefit when the materials being coated on each face of the substrate are not merely different but also reactive with one another, as this method allows the materials to be simultaneously applied without reaction.
  • the apparatus may also be used with only one of the coating heads in operation so as to prepare a substrate having a coating on only one face; alternatively water or other non-reactive liquid can be applied to the other face to eliminate paper curl in this situation, in conventional manner.
  • Fig. 1 illustrates schematically a paper making machine in combination with apparatus for use in applying to one face of the paper a coating of microcapsules containing colour former and to the other face a coating of clay containing colour developer, to produce an intermediate sheet of carbonless copy paper by the method of this invention
  • Fig. 2 is a schematic detail view of the coating area of the apparatus of Fig. I.
  • a slurry comprising 99.6% of water and 0.4% of wood fibre is led along a conveyor 1 having a surface formed of wire cloth. As the slurry moves along the conveyor water filters through the cloth and drops into a collecting area below. The slurry is then passed between a pair of rollers 2 which squeeze out more of the water, and around a set of rollers 3 which are steam heated. These rollers are at about 150°C and further dry the fibrous material to an extent that on leaving the rollers 3 the paper contains 15% water.
  • the paper which is now a continuous strip from 2 to 7 metres wide, passes round guide rollers 4 and through a size press 5 and thence round further heated rollers 6, after which the moisture content is 4-6%.
  • the paper is then led between calendering rolls 7 which impart a smooth surface to the paper, and round a guide roller 8 which passes the paper upwardly into coating apparatus 9 which is shown in detail in Fig. 2.
  • the paper enters the apparatus 9 between a pair of applicators in the form of jets lla, llb through one of which a dispersion of microcapsules in water is fed onto one face lOa of the paper and through the other of which a dispersion of acid activated bentonite or other colour developer in water is fed to the opposite face lOb.
  • the microcapsules have hydrophobic synthetic polymer walls and contain a colourless colour former such as crystal violet lactone reactive with the colour developer.
  • the microcapsule dispersion also contains starch particles whose particle size is greater than that of the microcapsules.
  • the dispersions are applied across most of the width of the paper, but strips at each edge are left uncoated so that the dispersions on each face lOa, lOb of the paper do not come into contact.
  • the dispersions are fed to the paper in excess, and as the paper continues to move upwardly it passes between an opposed pair of flexible blades 12 each of which is about 80mm in width, of similar length to the paper width and 0.3 to 0.5 mm thick. These blades are biassed towards one another so that as the paper carrying its excess of dispersions travels between them the surplus of each dispersion is wiped off the surface lOa, lOb of the paper, while the residual coated surface is smoothed by the blades 12. The blades while flexible are rigidly held and this imparts stability to the moving web of paper and "fluttering" is prevented.
  • the surplus dispersion removed by the blades 12 runs down the blades and blade holders 13 into a reservoir 14 from which it is pumped to the applicators lla, llb for recirculation.
  • microcapsules pass the blade they are protected to a considerable extent from mechanical damage by the starch particles which, being of greater size, contact the blade 12 and allow the microcapsules to pass in dispersion below the blade.
  • the microcapsules are thus, at least in part, separated from the blade 12 by the starch particles.
  • a double-blade coating apparatus 9 as shown can be obtained as a Twinblade apparatus from Inventing AB of Sweden.
  • the paper with its wet coatings of microcapsules on one face 10a and clay on the other lOb emerges vertically and is guided round an air roll 15 through 90° so as to move horizontally.
  • the air roll 15 has a cushion of air continuously applied to its surface so that the paper rests on the air cushion, thus protecting the smooth surface of the coatings from damage.
  • the paper then enters a drying chamber 16 in which it passes between banks of air jets 17 which blow hot air against it, thus driving off the wa:er from the dispersions and depositing the solid material on the paper.
  • a drying chamber 16 On emerging from the drying chamber 16 the paper is hot and the coatings dry, and the paper then passes round further conventional guide rollers to a centre-driven rewind with a flying splice facility 18, where it is wound for storage and collection.
  • the embodiment of the invention described above allows an intermediate sheet for pressure-sensitive carbonless copy paper to be produced having microcapsules containing colour former on one face and colour developer reactive with the colour former on the other face.
  • the sheet can be produced at speeds of up to 1000 metres per minute and with a much reduced amount of drying compared with conventional methods.
  • the arrangement in this embodiment of the invention allows either or both of the applicators lla, llb to be used, so that paper can be coated on one or both sides. This adaptability allows the quantity production of each type of paper to be maximised.
  • the apparatus of this embodiment is very compact as the drying chambers are relatively small and the coatings are applied simultaneously.
  • the use of the twin blades also allows much higher solids content to be used in the dispersions with the resulting saving in the amount of drying required.
  • the coated paper has po tendency to curl as it is wetted on both faces simultaneously.
  • Microcapsule dispersion (60% solids content) in water:
  • Microcapsule dispersion (60% solids content) in water:
  • Microcapsule dispersion (60% solids content) in water:

Landscapes

  • Color Printing (AREA)
  • Amplifiers (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Hall/Mr Elements (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP82301148A 1981-03-11 1982-03-05 Méthode de couchage d'une feuille de support Withdrawn EP0060113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8107711 1981-03-11
GB8107711 1981-03-11

Publications (1)

Publication Number Publication Date
EP0060113A1 true EP0060113A1 (fr) 1982-09-15

Family

ID=10520326

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82301149A Expired EP0060114B1 (fr) 1981-03-11 1982-03-05 Méthodes de couchage
EP82301148A Withdrawn EP0060113A1 (fr) 1981-03-11 1982-03-05 Méthode de couchage d'une feuille de support

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82301149A Expired EP0060114B1 (fr) 1981-03-11 1982-03-05 Méthodes de couchage

Country Status (4)

Country Link
EP (2) EP0060114B1 (fr)
AT (1) ATE17599T1 (fr)
DE (1) DE3268618D1 (fr)
FI (2) FI820830A7 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2596324A1 (fr) * 1986-03-27 1987-10-02 Wiggins Teape Group Ltd Papier revetu de microcapsules, porteur d'images
WO2006053714A1 (fr) * 2004-11-17 2006-05-26 Basf Aktiengesellschaft Materiau d'emballage presentant une couche contenant des microcapsules

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69323438T2 (de) 1992-11-06 1999-06-24 Robert Christchurch Neuseeland Donnelly Verfahren und vorrichtung zur beschichtung von papier und dergleichen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB894062A (en) * 1957-07-20 1962-04-18 J W Zanders Feinpapierfabrik G Apparatus for guiding travelling webs such as paper webs
US3311499A (en) * 1967-03-28 High speed means and method for coating and drying thin paper webs
US3485209A (en) * 1966-05-05 1969-12-23 Combined Locks Paper Co Apparatus for coating a traveling web of paper
GB1318635A (en) * 1969-07-03 1973-05-31 Fuji Photo Film Co Ltd Method of coating both surfaces of a web
GB2014481A (en) * 1978-02-14 1979-08-30 Appleton Paper Inc Coating apparatus and method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1337345A (en) * 1970-11-30 1973-11-14 Fuji Photo Film Co Ltd Producing capsule-coated sheets
GB1339082A (en) * 1971-02-23 1973-11-28 Wiggins Teape Research Dev Ltd Blade for use in the application of coatings to webs
JPS56192A (en) * 1979-06-18 1981-01-06 Mitsubishi Paper Mills Ltd Preparation of press-sensitive copying paper

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311499A (en) * 1967-03-28 High speed means and method for coating and drying thin paper webs
GB894062A (en) * 1957-07-20 1962-04-18 J W Zanders Feinpapierfabrik G Apparatus for guiding travelling webs such as paper webs
US3485209A (en) * 1966-05-05 1969-12-23 Combined Locks Paper Co Apparatus for coating a traveling web of paper
GB1318635A (en) * 1969-07-03 1973-05-31 Fuji Photo Film Co Ltd Method of coating both surfaces of a web
GB2014481A (en) * 1978-02-14 1979-08-30 Appleton Paper Inc Coating apparatus and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2596324A1 (fr) * 1986-03-27 1987-10-02 Wiggins Teape Group Ltd Papier revetu de microcapsules, porteur d'images
EP0240259A3 (en) * 1986-03-27 1989-04-26 The Wiggins Teape Group Limited Imaged microcapsule-coated paper
BE1001269A3 (fr) * 1986-03-27 1989-09-12 Wiggins Teape Group Ltd Papier revetu de microcapsules, porteur d'images.
WO2006053714A1 (fr) * 2004-11-17 2006-05-26 Basf Aktiengesellschaft Materiau d'emballage presentant une couche contenant des microcapsules

Also Published As

Publication number Publication date
FI820830L (fi) 1982-09-12
FI820831A7 (fi) 1982-09-12
EP0060114B1 (fr) 1986-01-22
DE3268618D1 (en) 1986-03-06
FI820830A7 (fi) 1982-09-12
EP0060114A1 (fr) 1982-09-15
ATE17599T1 (de) 1986-02-15
FI820831L (fi) 1982-09-12

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LU NL SE

17P Request for examination filed

Effective date: 19830308

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19841123

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HIGGINS, HUGH

Inventor name: JONES, NICHOLAS J.B.

Inventor name: GREEN, THOMAS GALLOWAY