EP0652808B1 - Verfahren zur herstellung von cf- oder cb-schichten aufweisenden papierbahnen für druckempfindliche aufzeichnungspapiere - Google Patents
Verfahren zur herstellung von cf- oder cb-schichten aufweisenden papierbahnen für druckempfindliche aufzeichnungspapiere Download PDFInfo
- Publication number
- EP0652808B1 EP0652808B1 EP93917650A EP93917650A EP0652808B1 EP 0652808 B1 EP0652808 B1 EP 0652808B1 EP 93917650 A EP93917650 A EP 93917650A EP 93917650 A EP93917650 A EP 93917650A EP 0652808 B1 EP0652808 B1 EP 0652808B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- colour
- paper web
- color
- application
- 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.)
- Revoked
Links
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 228
- 239000011248 coating agent Substances 0.000 claims abstract description 224
- 239000000049 pigment Substances 0.000 claims abstract description 66
- 239000000370 acceptor Substances 0.000 claims abstract description 56
- 238000012546 transfer Methods 0.000 claims abstract description 39
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 31
- 239000011707 mineral Substances 0.000 claims abstract description 31
- 239000007864 aqueous solution Substances 0.000 claims abstract description 14
- 238000004513 sizing Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 39
- 239000003094 microcapsule Substances 0.000 claims description 32
- 229920002472 Starch Polymers 0.000 claims description 29
- 239000008107 starch Substances 0.000 claims description 29
- 235000019698 starch Nutrition 0.000 claims description 29
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 28
- 239000007787 solid Substances 0.000 claims description 21
- 238000002360 preparation method Methods 0.000 claims description 18
- 239000002243 precursor Substances 0.000 claims description 16
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 14
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 13
- 239000005995 Aluminium silicate Substances 0.000 claims description 12
- 235000012211 aluminium silicate Nutrition 0.000 claims description 12
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 10
- 239000000454 talc Substances 0.000 claims description 7
- 229910052623 talc Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 5
- 229910001919 chlorite Inorganic materials 0.000 claims description 5
- 229910052619 chlorite group Inorganic materials 0.000 claims description 5
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims 3
- 238000003490 calendering Methods 0.000 claims 1
- 239000003086 colorant Substances 0.000 description 37
- 238000001035 drying Methods 0.000 description 11
- 239000011230 binding agent Substances 0.000 description 6
- YGSDEFSMJLZEOE-UHFFFAOYSA-N salicylic acid Chemical compound OC(=O)C1=CC=CC=C1O YGSDEFSMJLZEOE-UHFFFAOYSA-N 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000004927 clay Substances 0.000 description 5
- 239000004816 latex Substances 0.000 description 5
- 229920000126 latex Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000009499 grossing Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- -1 phenol aldehyde Chemical class 0.000 description 4
- 229920003043 Cellulose fiber Polymers 0.000 description 3
- 229920000881 Modified starch Polymers 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 150000002148 esters Chemical class 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 235000019426 modified starch Nutrition 0.000 description 3
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229960004889 salicylic acid Drugs 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- KJCVRFUGPWSIIH-UHFFFAOYSA-N 1-naphthol Chemical compound C1=CC=C2C(O)=CC=CC2=C1 KJCVRFUGPWSIIH-UHFFFAOYSA-N 0.000 description 2
- JWAZRIHNYRIHIV-UHFFFAOYSA-N 2-naphthol Chemical compound C1=CC=CC2=CC(O)=CC=C21 JWAZRIHNYRIHIV-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- GHMLBKRAJCXXBS-UHFFFAOYSA-N resorcinol Chemical compound OC1=CC=CC(O)=C1 GHMLBKRAJCXXBS-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229930185605 Bisphenol Natural products 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- YIOQCYXPSWJYHB-UHFFFAOYSA-N acetylene;phenol Chemical group C#C.OC1=CC=CC=C1 YIOQCYXPSWJYHB-UHFFFAOYSA-N 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 229950011260 betanaphthol Drugs 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 229920006184 cellulose methylcellulose Polymers 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003593 chromogenic compound Substances 0.000 description 1
- 239000011436 cob Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000007606 doctor blade method Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 150000004780 naphthols Chemical class 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052625 palygorskite Inorganic materials 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 150000003872 salicylic acid derivatives Chemical class 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 150000003681 vanadium Chemical class 0.000 description 1
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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
-
- 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
-
- 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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
Definitions
- the invention relates to a method for producing paper webs having a CF layer for pressure-sensitive recording papers by applying a coating color containing mineral-reactive mineral pigment or organic color acceptors.
- the present invention also relates to a method for producing a paper web having a CB layer for pressure-sensitive recording papers by applying a coating color which contains a color precursor solution enclosed in microcapsules.
- the invention relates to a method for producing a microcapsule in a layer with a color precursor solution enclosed therein and color acceptors therefor containing paper web by applying a coating color in which the microcapsules and the color acceptors are contained.
- CF layers (coated front) are understood to be so-called color receiver or color acceptor layers, which are usually arranged on the top of a sheet of paper and, when brought into contact with so-called color precursors or color formers, an image is triggered by a color reaction produce.
- CB layers are understood to mean the layers arranged on the back of a sheet of paper, in which the compounds referred to as color formers or color precursors are contained, which, in contact with the color acceptors, produce an image by triggering a color reaction.
- CB layers are to be understood which contain color precursors enclosed in microcapsules.
- Color-reactive mineral pigments which are usually referred to as acid clay, acid clay or the like and which are attributed to bentonite clays, have become widespread as color acceptors.
- color-reactive mineral pigments are to be understood as the clays mentioned above, in particular those clays whose main mineral is montmorillonite but also other color-reactive clays, such as attapulgite.
- organic color acceptors are generally understood to mean oil-soluble, acid-reacting organic substances which lead to a color reaction with suitable color precursors based on basic chromogenic compounds.
- suitable color precursors based on basic chromogenic compounds.
- phenolic substances such as phenol, resorcinol, naphthols and salicylic acid, which can also be alkyl-substituted, which can be present as monomers, oligomers or polymers (resins) and are metal-modified, preferably zinc-modified.
- From DE 14 21 395 C3 phenol di- or trioxybenzenes and 1- or 2-naphthol are known as organic color acceptors.
- DE 12 75 550 B1 specifies the polymers of phenol aldehyde and phenol acetylene as organic color acceptors, while in DE 22 28 431 B2 oil-soluble metal salts of phenol-formaldehyde resins, e.g. B. zinc (II) -paraphenylphenolformaldehyde resinate are described.
- DE 16 71 642 B2 names alkyl phenol carboxylates; According to DE-21 30 456 B2, phenol aldehyde resins with the addition of vanadium salt or other metal salts are known.
- Another group of organic color acceptors relates to salicylic acid and its derivatives, for which DE 21 52 763 A1 describes a polymeric reaction product of an aromatic carboxylic acid with an aldehyde or Acetylene, e.g. B. a salicylic acid-aldehyde polymer is known.
- DE 21 47 585 B2 relates to salicylic acid or derivatives with the addition of metal compounds.
- the common technical problem of the clays used as color-reactive pigments lies in that of the other coating pigments of the paper industry, e.g. As kaolin or calcium carbonate, different rheological behavior in the manufacture and processing of the coating color. In some cases there are abnormally high viscosities which restrict working with a high solids content. An economically significant problem is that the color reactive pigments are expensive and therefore must be used sparingly. This forces you to apply low coat weights, but this does not result in adequate coverage of the coating base paper for coat weights below 6 to 6.5 g / m 2 when using conventional coating processes - leveling and metering the applied coating color using a doctor knife and roller doctor knife the stroke becomes uneven and has areas uncovered by the coating color.
- the other coating pigments of the paper industry e.g. As kaolin or calcium carbonate
- a method for producing CF layers on the paper machine is proposed according to DE 26 23 802 B2.
- the problem of producing slave sheet layers with acid-leached bentonite clays is discussed in detail, and a mixture of color-reactive pigment, calcium carbonate and possibly kaolin is provided to remedy the existing difficulties.
- the application is carried out with a doctor knife or the roller coaters known at the time.
- EP 0 160 106 A1 also deals with the rheological problems (gel formation) of CF coating colors containing color-reactive pigment and provides for the combined addition of a bisphenol compound and calcium carbonate to form a coating color containing a special color-reactive pigment.
- the viscosities achieved are considerably reduced, there is still a disadvantage in that a special color-reactive pigment is required and the production of the coating color is relatively complicated due to the large number of components required.
- the application with a doctor knife is proposed as the coating device; the application of the coating color in an online process is not mentioned.
- a method for coating a paper web on both sides is known, which can also be used in the production of CFB sheets.
- a device is used in which a CB coating color is applied to the surface of a roller and metered with a doctor knife or a doctor roller.
- the applied CB coating slip is transferred to the paper web by tangentially guiding the paper web to the roller, the transfer being carried out by one on the other Side of the paper web press roll is supported.
- a further coating station is used to apply a CF coating color to the side of the paper web opposite the CB layer.
- the known method primarily serves to avoid web curling, but offers no further advantages in terms of improving the CF layer that go beyond the already known prior art.
- Airbrush coaters which indeed allow the application of a uniform and well covering coat application in the coat weight range below 6 g / m 2 , cannot be operated at the coating speeds customary today because the coating color is sprayed or the coating color is distributed unevenly due to the formation of air swirls.
- the coating colors In order to be able to distribute coating colors evenly with an air brush, the coating colors must be thin, which disadvantageously leads to the coating color being strongly pushed away into the paper, so that less color-reactive pigment on the surface Color reaction is available and the intensity of the copy deteriorates significantly.
- Another problem is the strong binder strike into the base paper, which requires a higher dosage of the binder.
- Another disadvantage is due to the high water content of the coating color in the high energy required for the evaporation of the water. If the drying capacity of the coating machine is limited, sufficient drying of the applied coating color is only possible by reducing the machine speed.
- Knife and doctor blade coaters have the common disadvantage that an uneven application arises due to the paper roughness. If the coating weight is below 6 to 6.5 g / m 2 , the coating color only fills the depressions in the paper, while the above areas are scratched free of coating color (spatula effect). CF layers with this defect do not produce a closed copy, rather this is interrupted several times in the millimeter range.
- the only remedy here is the admixing of non-color-reactive pigment already discussed, while accepting the disadvantages already described.
- Roller coating devices have the disadvantage when applying CF coating colors that due to the film splitting between paper and Applicator roller results in an uneven coating structure, which is commonly referred to as "orange peel structure".
- Organic color acceptors are also applied to a paper web from aqueous coating slip, in which, in addition to the organic color acceptors, one or more non-color-reactive mineral pigments, e.g. As calcium carbonate or kaolin, a binder, for. B. a starch solution or a latex and the usual tools such. B. dispersants, defoamers or the viscosity of the coating color regulating aids are included. Mixtures of organic color acceptors with inorganic color acceptors - color-reactive mineral pigments, such as acid clay - have also been proposed. Solids contents of between 25 and 60% by weight are known for coating colors containing organic color acceptors.
- non-color-reactive mineral pigments e.g. As calcium carbonate or kaolin
- a binder for. B. a starch solution or a latex and the usual tools such.
- B. dispersants, defoamers or the viscosity of the coating color regulating aids are included.
- CB coating colors are used.
- an air brush coating device is proposed according to DE 21 43 636 A1. This makes it possible to apply the coating color without exerting pressure on the microcapsules.
- DE 19 06 823 B2 relates to an application method for a liquid containing capsules, in which the paper web to be coated is carried out between two rollers, one of which serves as a counter roller and the other as an application roller.
- Small depressions are provided in the surface of the application roller, which are filled with the liquid containing the microcapsules and transferred from there to the paper web.
- the application roller is immersed in a container containing the microcapsule liquid and its surface is provided with a wiping device which is fitted between the container and the nip with the counter roller.
- the solids content of the microcapsule liquid to be applied is stated at 24% by weight.
- a disadvantage of this Application technology is the elaborate production of the application rollers and the dependence of the application weight on the size of the depressions made in the application roller or their pattern.
- a method is described in which one side of the paper web is treated with a microcapsule dispersion referred to there as the emulsion layer and the other side with a clay slurry.
- the application takes place by means of an engraved roller, which is coated with a coating color by a feed roller, via an application roller onto a paper web.
- DE 29 03 972 A1 discloses a method for simultaneously coating the two sides of a paper web, it being possible for one side to be provided with a microcapsule layer and the other side with a color acceptor layer.
- a transfer roller is used, on the surface of which the microcapsule dispersion is pre-metered by means of an engraved roller.
- the other side of the paper web can optionally also be provided with a color acceptor layer using an engraved roller or alternatively by means of a doctor blade coating method.
- a method for coating a material web with microcapsules in which an excess of coating material is applied and the excess is removed by pressing on a fixed device, and the remaining coating material is leveled on the material web.
- the pressing or leveling can take place with a doctor blade placed against a counter-pressure roller or with a metering doctor which either only presses against the web or against a counter-pressure roller wrapped around the web.
- the specified machine running speeds are little more than 100 m / min. Due to the pressure exerted on the paper web, there is a risk that the paper web will tear off, in particular if the application is carried out by means of a drag roller and the paper web is already moist.
- Sheets provided with a color acceptor layer (CF layer) on the front side are provided with a CB layer on the back side, resulting in a so-called CFB sheet.
- CF layer color acceptor layer
- the CF layer is also to be applied using a coating device installed in the paper machine, in addition to the drying device for the size press preparation, a further drying device is required to dry the CF layer. In economic terms as well as in terms of the space required for the necessary facilities, this creates a further disadvantage.
- a further object of the invention is to develop a method with which a coating color containing both microcapsules and color acceptors can be applied to one side of a paper web to form an SC layer (self contained).
- the invention makes use of the devices also known under the name "speedsizer” and described in the DE literature reference: Kliblatt für Textilfabrikation 23/24 (1987), p. 1.063 ff. And DE 34 17 487 A1 .
- speedsizer the use of the known devices as a size press and for applying coating colors is specified, but without the production of CF or CB sheets being addressed.
- the expression "simultaneously" used in claims and description in connection with the application of a coating color to one side and an aqueous solution or preparation to the other side of the paper web means that the transfer of the predosed coating color or Solution is done on the paper web from a cooperating pair of transfer rollers.
- the coating ink or solution predosed on the jacket of the transfer rollers is transferred simultaneously;
- the paper web is not guided vertically, but in such a way that the paper web rests on one of the two transfer rollers over part of its circumference, so that the coating color or solution to be transferred by means of this roller is transferred first, while the second coating ink or solution is transferred at the inlet in the nip of the pair of rollers, the transmission is not absolutely simultaneous, but with such a minimal interval that this is of no importance for the purposes of the invention.
- One by changing the paper web guide The minimal time shift caused in the order is therefore also encompassed by the invention.
- a pressure between 10 and 40 kN / m is preferably set between the two application rollers.
- the gap set between the two application rollers is smaller than the thickness of the uncoated paper.
- a gap setting is expediently carried out when applying higher coat weights, while the pressure is to be set in the range specified above for lower application weights.
- the gap setting is preferably also carried out so that the gap set is smaller than the thickness of the uncoated paper.
- the solids content of the CF coating color is adjusted to> 40% by weight, preferably the solids content is> 42% by weight and particularly preferably> 45% by weight .
- full sizing used in claims and description in connection with the invention is to be understood as a sizing degree in the range from 18 to 35 ° Cobb.
- CB coating or CB layer used in the description and claims is understood to mean aqueous coating colors which, in addition to the microcapsules, are also a binder for these, e.g. B. latex-based or starch-based.
- starch also includes starch derivatives such as starch esters.
- the coating colors containing microcapsules also contain so-called spacers based on non-dissolving starch granules or on the basis of fine and short cellulose fibers.
- the diameter of the spacers is 20 to 60 ⁇ m.
- the solids content of the CB coating slip is preferably in a range between 15 and 45% by weight.
- the aqueous solution or preparation to be applied to the back of CF or to the front of CB sheets according to the invention can consist of water, but only the tendency to curl the paper web is restricted or prevented.
- a starch solution is preferably used as the aqueous solution, so that the printability is also improved as a result of the better binding of the paper fibers.
- starch derivatives such as. B. to understand starch ether or ester. Solutions of polyvinyl alcohol and CMC are also suitable.
- the CF coating colors preferably contain only color-reactive mineral pigment and no further non-color-reactive pigments. Thus, although the addition of non-color-reactive pigments to improve the line uniformity is no longer absolutely necessary, these can still be present in the CF coating color or the CF layer.
- the process according to the invention also gives satisfactory results with a proportion of color-reactive pigments of not more than 50% by weight, based on the total pigment content, and with a small amount of coating, but the proportion of non-color-reactive pigment is preferably not more than 30% by weight on total pigment content.
- Calcium carbonate can be added to the CF coating colors to stabilize the high pH values.
- the closing speed of the printing ink can be slowed down by closing the surface if the sheet provided with a CF layer is then to be printed.
- Talc is also used to make the surface hydrophobic and smooth, which improves the transfer of dye precursor solutions in the form set.
- Barium sulfate and aluminum hydroxide result in a higher basic whiteness and optical brightening of the CF layers; Chlorite can be used in exchange for talc, but leads to a better intensity of the copy.
- Inhibited starch ie starch which is restricted or insoluble in its solubility, leads to a reduction in the line opacity, so that the lightening of the base paper shines through more clearly.
- the amount of coating applied is preferably not more than 7 g / m 2 .
- the uniform line structure which can be achieved by the process according to the invention is surprisingly also determined by the low line weight, in that the orange peel effect caused by film splitting is reduced at low line weights. This effect is reduced even further if the proportion of starch or starch derivatives, based on total binders, in CF coating colors with color-reactive mineral pigments is set to not more than 20% by weight.
- the real advantage of the invention is that even with low coating weights, a uniform coating structure and so that good coverage of the coating base surface can be adjusted while maintaining a constant application weight.
- the invention enables a higher quality of the image produced by the color reaction between the color precursor and the color-reactive mineral pigment due to the improved covering of the coating base paper surface.
- the comparison of a standard CF sheet described below with a CF sheet produced by the method of the present invention shows that the coating base surface is covered much better in the CF sheet produced according to the invention.
- Both sheets were produced under production conditions with the same coating color, in which the color acceptors consist of color-reactive mineral pigment, and using the same coating base paper.
- the standard CF sheet was produced on a conventional doctor blade equipped coating machine.
- the application weight for the standard sheet was 7 g / m 2 ; 6.5 g / m 2 were applied according to the invention.
- the surfaces of the two sheets produced were colored with a dye precursor solution producing a blue color, so that a deep blue coloration resulted on the sheets.
- the coating base papers to be used in the context of the present invention have a mass per unit area in the range from 35 to 50 g / m 2 , preferably from 36 to 46 g / m 2 .
- CF coating colors containing organic color acceptors As coating tests carried out with CF coating colors containing organic color acceptors have shown, even with relatively low application weights, a uniform coat application, a constant application weight and good coverage of the coating base paper surface are achieved, which is attributed to the volumetric pre-metering by means of a surface-profiled doctor rod.
- the measure known per se, CF coating colors containing organic color acceptors, and mineral non-color-reactive ones Mixing in pigments, eg calcium carbonate or kaolin, is also retained in the process according to the invention.
- the mineral pigments serve as carriers for the organic color acceptors and improve their effectiveness.
- the proportion of mineral, non-color-reactive pigments can be up to 90% by weight, based on the total solids content of the coating color.
- calcium carbonate, kaolin, barium sulfate, talc, chlorite, precipitated silicate, aluminum hydroxide or a mixture of these substances is preferably used.
- the actual advantage of the invention when applying CF coating colors with organic color acceptors is that both with a very low application weight, preferably not more than 6 g / m 2 , it is possible to apply both a sufficient amount of the organic color acceptors within the CF layer. as well as being able to produce a satisfactorily covered paper surface. This results in a sufficient intensity of the image generated by the reaction between the color precursor and the color acceptor.
- the amount of organic color acceptors applied is preferably in the range between 0.4 and 1 g / m 2 .
- the front of a CB sheet can be applied simultaneously with a CB coating color to be applied on the back with an aqueous solution, e.g. B. a starch solution.
- an aqueous solution e.g. B. a starch solution.
- all devices known per se can be used within the scope of the present invention, with which smoothing can take place on one or on both sides of a paper web. This includes both the devices working with several metal rollers in contact with one another and also those devices in which metal rollers are in contact with more or less elastic rollers.
- a smoothing of the side opposite the CB layer is particularly useful if a so-called CF layer is to be applied on this side.
- the smoothness is advantageously set to a value of at least 80 Bekk sec before the coating process.
- the simultaneous application of a CB coating color on one side of the paper web and a CF coating color on the other side of the paper web is therefore of particular economic importance.
- both coating colors with color-reactive mineral pigments or those with oil-soluble acid-reacting organic substances can be used as CF coating colors.
- the solids content of these CF coating slips is preferably> 40% by weight.
- the solids content of the CB coating colors to be used according to the invention is preferably in the range from 15 to 45% by weight.
- the coating device to be used according to the invention is installed in a paper machine instead of one of the previously used size presses, the economically particularly advantageous advantage arises that both a CF coating applied to the front and a starch solution or CB coating applied to the back are dried in a single drying device can be.
- the implementation of the method in the paper machine (on line) is therefore particularly preferred.
- the doctor rod is preferably profiled as such by milling or the doctor rod can be wire-wrapped to produce its profile.
- the profile depth and the contact pressure between the squeegee and transfer roller regulate the application quantity of the CF coating color.
- the direction of rotation of the doctor rod is opposite to the direction of travel of the paper web.
- Table 2 below shows various CF coating colors in which the color acceptors consist of color-reactive mineral pigment and the results obtained in pilot tests with a coating device installed in a paper machine.
- the coating colors also contained the usual auxiliaries in an amount not exceeding 3 parts by weight, such as carboxymethyl cellulose to regulate the viscosity, sodium hydroxide solution to adjust the pH to about 10.3 and calcium stearate.
- auxiliaries such as carboxymethyl cellulose to regulate the viscosity, sodium hydroxide solution to adjust the pH to about 10.3 and calcium stearate.
- the coating colors were adjusted to the solids content given in Table 1 with water.
- the information on the proportions of the individual components of the coating color relate to dry weight proportions.
- the line structure was uniform in all experiments, with good coverage of the paper surface.
- Table 3 shows various CF coating colors with organic color acceptors, which were also applied to an experimental coating device installed in a paper machine.
- Table 3 1 2nd 3rd 4th 5 6
- Calcium carbonate 73 60 72 60 60 60 Na-Al-silicate 20th 20th 20th 20th Zn-modified alkyl-substituted phenol-aldehyde condensation product 13 20th 20th 20th Zn-modified salicylic acid derivative 13 Strongest 13 16 13 6 6 6
- Color acceptor g / m 2 in the CF layer 0.4 0.6 0.6 0.9 1.0 1.0
- the information on the proportions of the individual components of the coating color relate to dry weight proportions. Rest: water.
- the line structure was uniform in all tests.
- the coating colors specified in Tables 2 and 3 were applied to a neutral sized wood-free coating base paper with a basis weight of 39 g / m 2 at a speed of 600 m / min. A 12% starch solution was applied on the back, so that an application weight of 0.9 g / m 2 , calculated as dry weight fractions, resulted.
- a coating comprising microcapsules and color-reactive mineral pigment for the production of a so-called SC paper is produced as follows: Sour clay 80 kaolin 20th latex 26 Microcapsules 71 Spacers 28 Solids content the coating color% by weight 35 Application weight g / m 2 11
- a pre-metered layer of an aqueous starch solution (5) On the surface of a first transfer roller (2) there is a pre-metered layer of an aqueous starch solution (5), while on the surface of the other transfer roller (2 ') a coating color (4) serving to form a CF layer (4') is pre-metered .
- the starch solution is pre-dosed by means of the grooved doctor blade (3) shown in simplified form and in the case of the CF coating color (4) by means of the grooved doctor blade (3 '). Both doctor blades are driven opposite to the direction of rotation of the transfer rollers.
- the pre-metered starch solution (5) or CF coating color (4) is transferred from the surfaces of the transfer rollers to the paper web (1).
- a device is shown in a simplified representation, comprising a doctor blade holder (7), also shown schematically.
- the starch solution (5) is brought in excess against the surface of the transfer roller (2). Excess starch solution runs off, as indicated by the arrow.
- the same squeegee holder or ink tray can be installed in the right part of the figure.
- Doctor blade holder, ink tray and ink guide devices are not the subject of the present invention and can therefore also by other suitable devices, such as. B. paint application tubes to be replaced.
- the color acceptors can either consist of mineral, color-active pigments or can be organic color acceptors.
- a CB coating color can be applied while the other side is treated with a starch solution or a CF coating.
Landscapes
- Paper (AREA)
- Color Printing (AREA)
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4224718 | 1992-07-27 | ||
DE19924224719 DE4224719C3 (de) | 1992-07-27 | 1992-07-27 | Verfahren zur Herstellung einer eine CF-Schicht aufweisenden Papierbahn für druckempfindliches Durchschreibepapier |
DE19924224716 DE4224716C3 (de) | 1992-07-27 | 1992-07-27 | Verfahren zur Herstellung einer eine CF-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere |
DE4224719 | 1992-07-27 | ||
DE19924224718 DE4224718C2 (de) | 1992-07-27 | 1992-07-27 | Verfahren zur Herstellung einer eine CB-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere |
DE4224716 | 1992-07-27 | ||
PCT/EP1993/001982 WO1994002258A1 (de) | 1992-07-27 | 1993-07-26 | Verfahren zur herstellung von cf- oder cb-schichten aufweisenden papierbahnen für druckempfindliche aufzeichnungspapiere |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0652808A1 EP0652808A1 (de) | 1995-05-17 |
EP0652808B1 true EP0652808B1 (de) | 1997-04-16 |
Family
ID=27204016
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93917650A Revoked EP0652808B1 (de) | 1992-07-27 | 1993-07-26 | Verfahren zur herstellung von cf- oder cb-schichten aufweisenden papierbahnen für druckempfindliche aufzeichnungspapiere |
Country Status (7)
Country | Link |
---|---|
US (1) | US5597612A (es) |
EP (1) | EP0652808B1 (es) |
JP (1) | JPH07509669A (es) |
DE (1) | DE59306209D1 (es) |
ES (1) | ES2102049T3 (es) |
FI (1) | FI106391B (es) |
WO (1) | WO1994002258A1 (es) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5599393A (en) * | 1995-04-25 | 1997-02-04 | Macmillan Bloedel Limited | Metering rod coaters |
EP0903247A1 (de) * | 1997-09-19 | 1999-03-24 | Simplex AG Bern | Verfahren zum partiellen Beschichten einer Papierbahn mit druckempfindlichen Massen und Vorrichtung zur Durchführung des Verfahrens |
EP1743976A1 (en) * | 2005-07-13 | 2007-01-17 | SAPPI Netherlands Services B.V. | Coated paper for offset printing |
DE102005057836B3 (de) * | 2005-12-03 | 2007-03-08 | Corvus Beschichtungssysteme Gmbh | Haftungsverbessernde Substanz und Verwendungen für Papier und Selbstdurchschreibepapier, Mikrokapselbeschichtungsmasse für Selbstdurchschreibepapier, Verfahren zu deren Herstellung |
DE102009023762A1 (de) * | 2009-06-03 | 2010-12-09 | Papierfabrik Schoellershammer Heinr. Aug. Schoeller Söhne GmbH & Co. KG | Für Digitaldruck geeignetes Transparentpapier und Verfahren zur Herstellung desselben |
WO2013112511A2 (en) * | 2012-01-23 | 2013-08-01 | International Paper Company | Separated treatment of paper substrate with multivalent metal salts and obas |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3630835A (en) * | 1968-02-13 | 1971-12-28 | Appleton Coated Paper Co | Method for coating paper with pressure rupturable fluid containing capsules |
US3632378A (en) * | 1969-01-31 | 1972-01-04 | Appleton Paper Inc | Method and apparatus for manufacture of dual coated sheet with pressure rupturable materials |
CA945443A (en) * | 1970-08-31 | 1974-04-16 | Thomas W. Busch | Film coating on paper base material |
US3705049A (en) * | 1970-08-31 | 1972-12-05 | Appleton Paper Inc | Method for the manufacture of double coated sheets with pressure-rupturable materials |
GB1337345A (en) * | 1970-11-30 | 1973-11-14 | Fuji Photo Film Co Ltd | Producing capsule-coated sheets |
US4042412A (en) * | 1975-06-20 | 1977-08-16 | Moore Business Forms, Inc. | High solids content active clay coating formulations and methods for producing and applying the same |
US4198446A (en) * | 1978-02-14 | 1980-04-15 | Ncr Corporation | Apparatus for the manufacture of a dual coated manifold sheet with pressure-rupturable materials |
JPS6096487A (ja) * | 1983-10-31 | 1985-05-30 | Mitsubishi Paper Mills Ltd | 画像記録材料用顕色シ−トの製造法 |
GB8402190D0 (en) * | 1984-01-27 | 1984-02-29 | Wiggins Teape Group Ltd | Coating paper |
DE3417487A1 (de) * | 1984-05-11 | 1985-11-21 | J.M. Voith Gmbh, 7920 Heidenheim | Vorrichtung zum auftragen einer fluessigkeit auf eine laufende bahn |
JPS62133198A (ja) * | 1985-11-30 | 1987-06-16 | 神崎製紙株式会社 | 紙シ−ト加工方法 |
GB8904112D0 (en) * | 1989-02-23 | 1989-04-05 | Wiggins Teape Group Ltd | Process for applying microcapsule-containing compositions to paper |
GB9009105D0 (en) * | 1990-04-23 | 1990-06-20 | Wiggins Teape Group Ltd | Improvements in apparatus for coating sheet material |
-
1993
- 1993-07-26 EP EP93917650A patent/EP0652808B1/de not_active Revoked
- 1993-07-26 WO PCT/EP1993/001982 patent/WO1994002258A1/de not_active Application Discontinuation
- 1993-07-26 ES ES93917650T patent/ES2102049T3/es not_active Expired - Lifetime
- 1993-07-26 JP JP6503926A patent/JPH07509669A/ja active Pending
- 1993-07-26 DE DE59306209T patent/DE59306209D1/de not_active Revoked
- 1993-07-26 US US08/256,846 patent/US5597612A/en not_active Expired - Fee Related
-
1995
- 1995-01-23 FI FI950283A patent/FI106391B/fi not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US5597612A (en) | 1997-01-28 |
FI950283A (fi) | 1995-01-23 |
FI106391B (fi) | 2001-01-31 |
WO1994002258A1 (de) | 1994-02-03 |
DE59306209D1 (de) | 1997-05-22 |
ES2102049T3 (es) | 1997-07-16 |
EP0652808A1 (de) | 1995-05-17 |
FI950283A0 (fi) | 1995-01-23 |
JPH07509669A (ja) | 1995-10-26 |
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