EP0060114B1 - Improvements in coating methods - Google Patents
Improvements in coating methods Download PDFInfo
- Publication number
- EP0060114B1 EP0060114B1 EP82301149A EP82301149A EP0060114B1 EP 0060114 B1 EP0060114 B1 EP 0060114B1 EP 82301149 A EP82301149 A EP 82301149A EP 82301149 A EP82301149 A EP 82301149A EP 0060114 B1 EP0060114 B1 EP 0060114B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dispersion
- microcapsules
- support
- blade
- 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.)
- Expired
Links
Images
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.
- US Patent No. 3,897,578 describes a method of applying to a paper support a dispersion of microcapsules having a solids content of from 20 to 80%, and optionally containing cellulose flocks to increase the anti-wear property of the microcapsule coating. An excess of the dispersion is applied and the support is then passed below a blade to remove the excess at a speed of 90 to 120 metres per minute.
- a method of providing a sheet support with a coating of microcapsules comprising providing in a carrier liquid a dispersion of microcapsules having hydrophobic walls and particulate material of greater particle size than the microcapsules, the dispersion having a solids content in excess of 40 per cent by weight, applying the dispersion in the form of a continuous liquid to the sheet support, passing the support with the applied dispersion past a blade in contact with the dispersion on the support at a speed of at least 600 metres per minute to remove excess of the dispersion, and drying the coated support.
- the microcapsules are typically 10-90 per cent by weight of the solids in the coating material, and the balance may be made up of "stilt” and other material.
- "Stilt” comprises the 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.
- the concentration of coating material in the dispersion 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 per cent 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.
- suitabie 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 8b mm wide and 0.5 mm 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 40 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:
- 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.
Abstract
Description
- This invention relates to a method of coating a support with microcapsules, especially but not exclusively in the preparation of pressure-sensitive recording papers.
- In recent years there has been a considerable increase in the use of pressure-sensitive recording papers which act by virtue of a coating of microcapsules, containing a colour former such as crystal violet lactone, on one face of a first sheet of the paper, and a coating of a colour developer such as clay on a face of a second sheet. The colour former and developer are reactive to form a coloured product. Rupture of the microcapsules when the two coated faces are in contact releases the colour former for reaction with the developer, producing a coloured area on the second sheet in the area of rupture.
- Many techniques have been proposed for applying the microcapsule coating, but in each case it has been considered essential to avoid excessive shear being applied to the microcapsules themselves, and it has therefore been advocated to use an air-knife technique. In this a suspension of the microcapsules in water is applied in excess to the paper as it passes in continuous form through a coating machine, and the excess is then removed by passing the paper with its applied suspension past a fine blast of air. The air blast is controlled at a velocity sufficient to remove all but a predetermined thickness of the suspension from the paper.
- The air-knife technique is very reliable and accurately controllable, and avoids mechanical damage of the microcapsules. However, 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. Further, 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.
- It has previously been proposed in, for example, production of magazine-quality paper, to coat the paper on each side with starch by application of a blade-coating technique. 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.
- Advances have been made in recent years in the manufacture of microcapsules, for example as described in UK Patent Nos. 1,292,939 and 1,319,123 of Fuji Photo Film Co. Ltd., whereby the capsule wall material is a synthetic polymer produced in situ rather than the conventional gelatin. The synthetic polymer wall is hydrophobic and therefore less likely than gelatin to swell when wet. As a result it has now surprisingly been discovered that a coating of such hydrophobic synthetic polymer-walled microcapsules can be applied to paper successfully by techniques other than the air-knife method.
- US Patent No. 3,897,578 describes a method of applying to a paper support a dispersion of microcapsules having a solids content of from 20 to 80%, and optionally containing cellulose flocks to increase the anti-wear property of the microcapsule coating. An excess of the dispersion is applied and the support is then passed below a blade to remove the excess at a speed of 90 to 120 metres per minute.
- According to the present invention there is provided a method of providing a sheet support with a coating of microcapsules, comprising providing in a carrier liquid a dispersion of microcapsules having hydrophobic walls and particulate material of greater particle size than the microcapsules, the dispersion having a solids content in excess of 40 per cent by weight, applying the dispersion in the form of a continuous liquid to the sheet support, passing the support with the applied dispersion past a blade in contact with the dispersion on the support at a speed of at least 600 metres per minute to remove excess of the dispersion, and drying the coated support.
- The microcapsules are typically 10-90 per cent by weight of the solids in the coating material, and the balance may be made up of "stilt" and other material. "Stilt" comprises the 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. In the prior art it has been suggested to use cellulose fibres as the stilt material when air-knife coating, but fibrous material is not recommended in the present invention as it tends to clog the blade by the fibre becoming entangled and causing a build-up. This also tends to cause scoring of the support paper. The particulate material used in the present invention such as starch, does not suffer from this disadvantage.
- The support may be paper and the microcapsules may contain a colourless colour former.
- The concentration of coating material in the dispersion 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 per cent 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.
- 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. Examples of suitabie 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.
- As well as producing a superior product, 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. Thus 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. In 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. With 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.
- An embodiment of the invention will now be described by way of example with reference to the accompanying drawings, in which:
- Fig. 1 is a schematic view of a part of a coating machine for performing the method of this invention; and
- Fig. 2 is a side view of the blade portion of the machine of Fig. 1.
- Referring to the drawings, 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 drivenroller 6, theblade 5 being biassed towards theroller 6 on the coated side of the paper 1 so that as the paper passes between them theblade 5 allows only a predetermined depth of dispersion to remain on the paper 1, the excess dispersion remaining in apool 7 above the blade line of contact between theblade 5 and paper 1 and flowing from the ends of theblade 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 theroller 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 8b mm wide and 0.5 mm thick. - After passing the
blade 5 the paper coated with the dispersion passes through adrying tunnel 10 until the coating is dry, round heatedconditioning rollers 8 and then wound onto aspool 9. - The invention will be further illustrated in the following Examples which describe embodiments of the invention, in which the machine shown in the drawings was used for coating.
-
- The solids content of the dispersion was 45% by weight.
- The resulting dispersion was applied to one face of 40 g/m2 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 androller 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 dryingrollers 8 to remove the water from the dispersion and leave the microcapsules evenly coated on the paper face. - Because of the high percentage of solids in the dispersion and despite the high feed rate of the paper, no additional drying apparatus was needed; thus increased output was obtained at no additional capital cost and greatly reduced heating costs for the drying apparatus.
-
- 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:
-
-
- In these Examples 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.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT82301149T ATE17599T1 (en) | 1981-03-11 | 1982-03-05 | COATING PROCESS. |
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 EP0060114A1 (en) | 1982-09-15 |
EP0060114B1 true EP0060114B1 (en) | 1986-01-22 |
Family
ID=10520326
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82301149A Expired EP0060114B1 (en) | 1981-03-11 | 1982-03-05 | Improvements in coating methods |
EP82301148A Withdrawn EP0060113A1 (en) | 1981-03-11 | 1982-03-05 | Method of coating a support sheet |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82301148A Withdrawn EP0060113A1 (en) | 1981-03-11 | 1982-03-05 | Method of coating a support sheet |
Country Status (4)
Country | Link |
---|---|
EP (2) | EP0060114B1 (en) |
AT (1) | ATE17599T1 (en) |
DE (1) | DE3268618D1 (en) |
FI (2) | FI820830L (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8607689D0 (en) * | 1986-03-27 | 1986-04-30 | Wiggins Teape Group Ltd | Imaged microcapsule-coated paper |
DE69323438T2 (en) | 1992-11-06 | 1999-06-24 | Patrick Sundholm | METHOD AND DEVICE FOR COATING PAPER AND THE LIKE |
US20090148575A1 (en) * | 2004-11-17 | 2009-06-11 | Basf Aktiengesellschaft | Packaging material comprising a coating with microcapsules |
Family Cites Families (8)
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 (en) * | 1957-07-20 | 1963-03-07 | J W Zanders Feinpapierfabrik G | Device for the contactless guiding of running webs, especially coated, still wet paper webs |
US3485209A (en) * | 1966-05-05 | 1969-12-23 | Combined Locks Paper Co | Apparatus for coating a traveling web of paper |
JPS4844171B1 (en) * | 1969-07-03 | 1973-12-22 | ||
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 |
US4198446A (en) * | 1978-02-14 | 1980-04-15 | Ncr Corporation | Apparatus for the manufacture of a dual coated manifold sheet with pressure-rupturable materials |
JPS56192A (en) * | 1979-06-18 | 1981-01-06 | Mitsubishi Paper Mills Ltd | Preparation of press-sensitive copying paper |
-
1982
- 1982-03-05 EP EP82301149A patent/EP0060114B1/en not_active Expired
- 1982-03-05 EP EP82301148A patent/EP0060113A1/en not_active Withdrawn
- 1982-03-05 AT AT82301149T patent/ATE17599T1/en not_active IP Right Cessation
- 1982-03-05 DE DE8282301149T patent/DE3268618D1/en not_active Expired
- 1982-03-10 FI FI820830A patent/FI820830L/en not_active Application Discontinuation
- 1982-03-10 FI FI820831A patent/FI820831L/en not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0060113A1 (en) | 1982-09-15 |
FI820831L (en) | 1982-09-12 |
FI820830L (en) | 1982-09-12 |
DE3268618D1 (en) | 1986-03-06 |
ATE17599T1 (en) | 1986-02-15 |
EP0060114A1 (en) | 1982-09-15 |
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