EP0060114A1 - Beschichtungsverfahren - Google Patents

Beschichtungsverfahren Download PDF

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Publication number
EP0060114A1
EP0060114A1 EP82301149A EP82301149A EP0060114A1 EP 0060114 A1 EP0060114 A1 EP 0060114A1 EP 82301149 A EP82301149 A EP 82301149A EP 82301149 A EP82301149 A EP 82301149A EP 0060114 A1 EP0060114 A1 EP 0060114A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
microcapsules
coating
support
paper
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.)
Granted
Application number
EP82301149A
Other languages
English (en)
French (fr)
Other versions
EP0060114B1 (de
Inventor
Nicholas J.B. Jones
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=EP0060114(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
Priority to AT82301149T priority Critical patent/ATE17599T1/de
Publication of EP0060114A1 publication Critical patent/EP0060114A1/de
Application granted granted Critical
Publication of EP0060114B1 publication Critical patent/EP0060114B1/de
Expired 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 with microcapsules, especially but not exclusively in the preparation of pressure-sensitive recording papers.
  • the air-knife technique is very reliable and accurately controllable, and avoids mechanical damage of the microcapsules.
  • a disadvantage is that the suspension must be of low solids content otherwise the air blast is insufficient to remove the excess accurately.
  • the coated paper emerging from the air-knife is therefore very wet, and this leads to swelling of the paper. As a result the image on the copies can be of poor definition and it is necessary to provide large drying apparatus. These coating machines therefore occupy considerable areas, primarily due to the amount of drying needed.
  • the coating applied by the air-knife technique is relatively rough in surface finish, and the coated paper has to be calendered to provide an acceptable smoothness. This can be done when the coating is the colour developer, but the calendering process ruptures microcapsules and cannot therefore be performed on the sheet coated with colour former. The colour former-coated sheet has had to remain rough.
  • Blade coating has been found to produce a much smoother surface finish than air-knife coating, but such a technique has never before been used industrially in the application of a microcapsule coating in view of the much greater mechanical forces applied by the blade to the paper and coating material. Blade coating has therefore been regarded as necessarily resulting in rupture of the microcapsules and has not been considered to be a practical proposition. This has been emphasised by the use of gelatin-walled microcapsules; gelatin is hydrophilic and swells on absorption of water, thus weakening the integrity of the microcapsules when wet and making them more likely to rupture under blade coating.
  • a method of coating a support with microcapsules comprising providing in a carrier liquid a dispersion of microcapsules having hydrophobic walls, applying the dispersion to the support, passing the support with the applied dispersion past a blade in contact with the dispersion on the support to remove excess of the dispersion, and drying the coated support.
  • the microcapsules are typically 10-90% by weight of the solids in the coating material, and the balance may be made up of "stilt” and other material.
  • "Stilt” comprises particles of greater size than the microcapsules so that in use they extend further from the support and protect the microcapsules from accidental rupture during transit and storage of the coated support.
  • Starch is a typical stilt material, although others such as glass beads and polymer granules can be used.
  • a further factor of considerable importance in the use of particulate stilt material in the method of this invention is that the stilt protects the microcapsules during the coating procedure. As the particles are larger than the microcapsules they are struck by the blade in preference to the microcapsules which thus pass below the blade with the minimum of physical contact.
  • the support may be paper and the microcapsules may contain a colourless colour former.
  • microcapsules allow a very high solids content of the dispersion to be achieved, considerably in excess of 25% which is generally the maximum in conventional coating techniques.
  • the preferred concentration of coating material in the dispersion is more than 40% and the concentration is preferably selected to make the solids content in the dispersion as high as possible (to minimise the required amount of drying) while still allowing the blade to produce a reasonably smooth coating on the substrate.
  • a solids content of 40-60% has been found to be effective in this.
  • the blade is preferably flexible so as to "spread" the dispersion on the substrate; flexible blades are also to be recommended as they cause less mechanical damage to the microcapsules than do rigid blades and spread the dispersion more evenly over the substrate surface.
  • microcapsule-containing coating material In order that the specified concentration of microcapsule- containing coating material can be achieved without the microcapsules being ruptured by the blade, they should be synthetic polymer-walled rather than gelatin-walled, and the polymer preferably provides physical strength greater than that provided by the conventional gelatin wall.
  • suitable materials for producing such a polymer wall are polyurea, polyamide, urea-formaldehyde, melamine-formaldehyde and polyurethane, all of which are hydrophobic.
  • the hydrophobic walls of the microcapsules used in the present invention resist swelling and weakening when wet, and therefore provide a medium which can be passed through a blade coater without rupture and which allow a sharp image to be achieved in use.
  • the hydrophobic property of the wall material therefore allows the coated support, which may for example be pressure-sensitive recording paper, to retain its microcapsule walls intact, with the result that when the microcapsules contain colourless colour former the colour former does not escape during the coating procedure and undesirable background colouration of the paper is absent when it comes into contact with a sheet containing colour developer.
  • the blade coating technique provides a considerably smoother surface finish to the coated support than does the conventional air-knife technique and, as paper coated with microcapsules cannot be calendered for fear of rupturing the microcapsules, this allows a superior product to be obtained.
  • the smooth finish enhances not only the feel and appearance of the coated paper, making it a more commercially-acceptable product, but also the sharpness of the image obtained on rupture of the microcapsules in view of the more even microcapsule coating.
  • the method of this invention allows considerable manufacturing advantages to be gained over conventional and commonly-used coating methods, especially in the saving of space and power for the drying stages.
  • the coating operation can also be conducted at much higher speeds than previously, thus producing an increase in output and greater capacity for the coating machinery.
  • the blade-type coating machinery used in the method of this invention can operate at speeds in excess of 1000 metres of continuous paper sheet per minute, and the reduced drying requirement allows such coating speeds to be coped with without an overall increase in the size of the machine as compared with conventional air-knife machinery.
  • the present method allows great savings to be made both in capital cost of machinery and in running costs.
  • a further advantage in the use of the present method is in the ease of controlling and maintaining the equipment used.
  • conventional air-knife coating it is necessary to make fine adjustments to the velocity of the air blasts and to ensure that the air jets remain clear, otherwise the uniformity of the coating suffers.
  • blade coating however much less maintenance is required as the blade is a fixed mechanical entity, set at a predetermined pressure against the support, and adjustment after initial setting is rarely needed.
  • a continuous length of paper 1 is fed to calendering rollers 2 and passes between them to receive a smooth surface. From the rollers 2 the paper 1 passes round a guide roller 3 and thence downwards past a horizontally-disposed slot orifice 4 through which a dispersion of hydrophobic-walled microcapsules in water is fed onto one face of the paper 1.
  • the paper with its applied dispersion then passes between a flexible steel blade 5 and a driven roller 6, the blade 5 being biassed towards the roller 6 on the coated side of the paper 1 so that as the paper passes between them the blade 5 allows only a predetermined depth of dispersion to remain on the paper 1, the excess dispersion remaining in a pool 7 above the blade line of contact between the blade 5 and paper 1 and flowing from the ends of the blade 5 into a receiving vessel (not shown) for feeding back to the orifice 4.
  • the blade 5 is set at an acute angle to the paper 1 where it contacts the roller 6 so that, as the paper passes, the microcapsule coating is spread and smoothed over the surface of the paper.
  • the blade is of similar length'to the width of the paper 1 and is about 80mm wide and 0.5mm thick.
  • the paper coated with the dispersion After passing the blade 5 the paper coated with the dispersion passes through a drying tunnel 10 until the coating is dry, round heated conditioning rollers 8 and then wound onto a spool 9.
  • Polyurethane-walled microcapsules were prepared as described in Example 1 of U.K. Patent No. 1,292,939, and a dispersion of the following components was made up in water:
  • the solids content of the dispersion was 45% by weight.
  • the resulting dispersion was applied to one face of 4 0 g/m 2 support paper 1 by applying from the slot orifice 4 an excess of the dispersion continuously onto the paper face as the paper in strip form was run at 1000 metres per minute through the coating machine. After being sprayed the paper passed between the flexible blade 5 and roller 6 which spread the dispersion evenly over the paper face to a constant depth and removed the excess. The coated paper then passed over the drying rollers 8 to remove the water from the dispersion and leave the microcapsules evenly coated on the paper face.
  • Example 1 The method of Example 1 was followed, with the exception that the feed rate of the paper was 700 metres per minute,and the coating dispersion had 50% solids content. The number of drying rollers 8 was correspondingly reduced.
  • the dispersion contained the following components in water:
  • Example 1 The method of Example 1 was followed with the exception that the paper feed rate was 600 metres per minute and the coating dispersion had a solids content of 50%. The amount of drying was even less than in Example 2.
  • the dispersion contained the following components in water:
  • Example 1 The method of Example 1 was followed with the exception that the paper feed rate was 950 metres per minute and the coating dispersion had a solids content of 60% by weight.
  • the dispersion contained the following components in water:
  • the microcapsules contained colourless colour-forming material and the coated paper was useful as pressure-sensitive recording paper when in contact with paper coated with colour developer such as activated bentonite clay.

Landscapes

  • Color Printing (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Amplifiers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Hall/Mr Elements (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Emergency Protection Circuit Devices (AREA)
EP82301149A 1981-03-11 1982-03-05 Beschichtungsverfahren Expired EP0060114B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82301149T ATE17599T1 (de) 1981-03-11 1982-03-05 Beschichtungsverfahren.

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0060114A1 true EP0060114A1 (de) 1982-09-15
EP0060114B1 EP0060114B1 (de) 1986-01-22

Family

ID=10520326

Family Applications (2)

Application Number Title Priority Date Filing Date
EP82301148A Withdrawn EP0060113A1 (de) 1981-03-11 1982-03-05 Verfahren zur Beschichtung eines Trägerblatts
EP82301149A Expired EP0060114B1 (de) 1981-03-11 1982-03-05 Beschichtungsverfahren

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP82301148A Withdrawn EP0060113A1 (de) 1981-03-11 1982-03-05 Verfahren zur Beschichtung eines Trägerblatts

Country Status (4)

Country Link
EP (2) EP0060113A1 (de)
AT (1) ATE17599T1 (de)
DE (1) DE3268618D1 (de)
FI (2) FI820830L (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994011116A1 (en) 1992-11-06 1994-05-26 Patrick Sundholm Method and apparatus for coating paper or the like

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8607689D0 (en) * 1986-03-27 1986-04-30 Wiggins Teape Group Ltd Imaged microcapsule-coated paper
JP2008520459A (ja) * 2004-11-17 2008-06-19 ビーエーエスエフ ソシエタス・ヨーロピア マイクロカプセルを有するコーティングを有する包装材料

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1339082A (en) * 1971-02-23 1973-11-28 Wiggins Teape Research Dev Ltd Blade for use in the application of coatings to webs
US3897578A (en) * 1970-11-30 1975-07-29 Fuji Photo Film Co Ltd Process of producing capsule-coated sheets
GB2014481A (en) * 1978-02-14 1979-08-30 Appleton Paper Inc Coating apparatus and method
GB2052588A (en) * 1979-06-18 1981-01-28 Mitsubishi Paper Mills Ltd Process for Producing Pressure- Sensitive Copying Paper

Family Cites Families (4)

* 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
DE1144987B (de) * 1957-07-20 1963-03-07 J W Zanders Feinpapierfabrik G Vorrichtung zum beruehrungslosen Fuehren von laufenden Bahnen, insbesondere beschichteten, noch nassen Papierbahnen
US3485209A (en) * 1966-05-05 1969-12-23 Combined Locks Paper Co Apparatus for coating a traveling web of paper
JPS4844171B1 (de) * 1969-07-03 1973-12-22

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3897578A (en) * 1970-11-30 1975-07-29 Fuji Photo Film Co Ltd Process of 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
GB2014481A (en) * 1978-02-14 1979-08-30 Appleton Paper Inc Coating apparatus and method
GB2052588A (en) * 1979-06-18 1981-01-28 Mitsubishi Paper Mills Ltd Process for Producing Pressure- Sensitive Copying Paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994011116A1 (en) 1992-11-06 1994-05-26 Patrick Sundholm Method and apparatus for coating paper or the like

Also Published As

Publication number Publication date
DE3268618D1 (en) 1986-03-06
FI820831L (fi) 1982-09-12
EP0060113A1 (de) 1982-09-15
ATE17599T1 (de) 1986-02-15
EP0060114B1 (de) 1986-01-22
FI820830L (fi) 1982-09-12

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