EP0652808B1 - Procede de fabrication de bandes de papier a couches de reception ou d'emission utiles comme papiers d'enregistrement sensibles a la pression - Google Patents

Procede de fabrication de bandes de papier a couches de reception ou d'emission utiles comme papiers d'enregistrement sensibles a la pression Download PDF

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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
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Prior art keywords
coating
colour
paper web
color
application
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EP93917650A
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German (de)
English (en)
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EP0652808A1 (fr
Inventor
Horst Schoen
Horst Walter Heyer
Wolfram Friesen
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Stora Publication Paper AG
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Stora Publication Paper AG
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Priority claimed from DE19924224719 external-priority patent/DE4224719C3/de
Priority claimed from DE19924224716 external-priority patent/DE4224716C3/de
Priority claimed from DE19924224718 external-priority patent/DE4224718C2/de
Application filed by Stora Publication Paper AG filed Critical Stora Publication Paper AG
Publication of EP0652808A1 publication Critical patent/EP0652808A1/fr
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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
    • 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.

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Abstract

Selon un procédé de fabrication d'une bande de papier ayant une couche de réception et utile comme papier d'enregistrement sensible à la pression, la bande de papier (1) est encollée dans la masse afin d'obtenir un encollage total, et une encre de couchage (4) contenant des accepteurs de couleurs en pigments minéraux chromoréactifs est appliquée avec un dispositif de couchage, dans lequel la bande de papier (1) est guidée entre deux rouleaux de transfert (2, 2') écartés par une fente ou réglés de manière à exercer une pression minimale. Le premier rouleau transfère l'encre de couchage (4) volumétriquement prédosée sur une face de la bande de papier (1) au moyen d'une barre de couchage rotative entraînée à surface profilée, afin de former la couche de réception (4') et l'autre rouleau de transfert applique en même temps sur l'autre face de la bande de papier une solution aqueuse (5) volumétriquement prédosée au moyen lui aussi d'une barre de couchage (3) rotative et entraînée à surface profilée. La quantité de pigment chromoréactif dans la couche sèche de réception est comprise entre 3,5 et 5g/m2.

Claims (20)

  1. Procédé pour la fabrication d'une bande de papier portant une couche CF (coated front), destinée à des papiers d'enregistrement sensibles à la pression, par application d'une masse de couchage, dans laquelle les accepteurs de colorant sont des pigments minéraux réactifs chromogènes, caractérisé par la combinaison des propriétés suivantes :
    - la bande de papier (1) est collée dans la masse pour obtenir un collage fort,
    - l'application de la masse de couchage (4) est opérée avec une installation de couchage dans laquelle on fait passer la bande de papier (1) entre deux cylindres de transfert (2; 2') réglés de façon à laisser une fente ou avec une pression minimale;
    - parmi lesquels l'un assure le transfert de la masse de couchage (4) sur une face de la feuille de papier (1), en un volume dosé à l'aide d'une racle (3') entraînée en rotation, à surface profilée, afin de former la couche CF (4'),
    - et l'autre assure le transfert simultané de la solution aqueuse (5) sur l'autre face de la bande de papier, en un volume dosé à l'aide d'une racle (3) entraînée en rotation, à surface profilée,
    - la masse de couchage présente une viscosité comprise entre 500 et 2000 mPa.s et est appliquée à raison de 4 à 9 g/m2 (calculé en partie de matières sèches);
    - la quantité de pigments réactifs chromogènes dans la couche CF séchée est comprise entre 3,5 et 5 g/m2.
  2. Procédé pour la fabrication d'une bande de papier portant une couche CF (coated front), destinée à des papiers d'enregistrement sensibles à la pression, par application d'une masse de couchage, dans laquelle les accepteurs de colorant sont des pigments organiques réactifs chromogènes, caractérisé par les propriétés suivantes :
    - la bande de papier (1) est collée dans la masse pour obtenir un collage fort,
    - l'application de la masse de couchage (4) est opérée avec une installation de couchage dans laquelle on fait passer la bande de papier (1) entre deux cylindres de transfert (2; 2') réglés de façon à laisser une fente ou avec une pression minimale;
    - parmi lesquels l'un assure le transfert de la masse de couchage (4) sur une face de la feuille de papier (1), en un volume dosé à l'aide d'une racle (3') entraînée en rotation, à surface profilée, afin de former la couche CF (4'),
    - et l'autre assure le transfert simultané d'une solution aqueuse (5) sur l'autre face de la bande de papier, en un volume dosé à l'aide d'une racle (3) entraînée en rotation, à surface profilée,
    - la masse de couchage présente une viscosité comprise entre 200 et 2000 mPa.s et est appliquée à raison de 4 à 7 g/m2 (calculé en partie de matières sèches);
    - la quantité de pigments organiques réactifs chromogènes dans la couche CF séchée est comprise entre 0,2 et 2,0 g/m2.
  3. Procédé pour la fabrication d'une bande de papier portant une couche CB (coated back), destinée à des papiers d'enregistrement sensibles à la pression, par application d'une masse de couchage CB qui contient une solution de précurseurs de colorants enfermée dans des microcapsules, caractérisé par la combinaison des propriétés suivantes :
    - la bande de papier (1) est collée dans la masse pour obtenir un collage fort,
    - l'application de la masse de couchage (4) est opérée avec une installation de couchage dans laquelle on fait passer la bande de papier (1) entre deux cylindres de transfert (2; 2') réglés de façon à laisser une fente ou avec une pression minimale;
    - parmi lesquels l'un assure le transfert de la masse de couchage (4) sur une face de la feuille de papier (1), en un volume dosé à l'aide d'une racle (3') entraînée en rotation, à surface profilée, afin de former la couche CB (4'),
    - et l'autre assure le transfert simultané d'une préparation ou solution aqueuse (5) sur l'autre face de la bande de papier, en un volume dosé à l'aide d'une racle (3) entraînée en rotation, à surface profilée.
  4. Procédé pour la fabrication d'une bande de papier contenant des microcapsules avec une solution de précurseurs de colorant et des accepteurs de colorant enfermés dans celle-ci, par application d'une masse de couchage qui contient les microcapsules et les accepteurs de colorant, caractérisé par la combinaison des propriétés suivantes :
    - la bande de papier (1) est collée dans la masse pour obtenir un collage fort,
    - l'application de la masse de couchage (4) est opéréee avec une installation de couchage dans laquelle on fait passer la bande de papier (1) entre deux cylindres de transfert (2; 2') réglés de façon à laisser une fente ou avec une pression minimale;
    - parmi lesquels l'un assure le transfert de la masse de couchage (4) sur une face de la feuille de papier (1), en un volume dosé à l'aide d'une racle (3') entraînée en rotation, à surface profilée, afin de former la couche SC (4'),
    - et l'autre assure le transfert simultané d'une préparation ou solution aqueuse (5) sur l'autre face de la bande de papier, en un volume dosé à l'aide d'une racle (3) entraînée en rotation, à surface profilée.
  5. Procédé selon la revendication 1 ou 2, caractérisé par le fait que la pression réglée entre les deux cylindres (2,2') d'application est comprise entre 10 et 40 kN/m.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé par le fait que la fente entre les deux cylindres (2,2') est une fente dont la hauteur est inférieure à l'épaisseur du papier à l'état non couché.
  7. Procédé selon l'une des revendications 1, 2, 5 et 6, caractérisé par le fait que la teneur en matières solides de la masse de couchage CF est > 40 % en poids.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé par le fait que la solution aqueuse est une solution d'amidon ou une solution de poly(alcool de vinyle) ou de CMC.
  9. Procédé selon l'une des revendications 1 et 5 à 8, caractérisé par le fait que la masse de couchage CF contient, en plus du pigment minéral réactif chromogène, jusqu'à 50 % en poids ― rapporté à la teneur totale en pigment, calculé en partie de poids de matières sèches ― d'un pigment non réactif chromogène choisi parmi le groupe carbonate de calcium, kaolin, sulfate de barium, talc, chlorite, silicate précipité, hydroxyde d'aluminium et amidon inhibé ou d'un mélange de ces composés.
  10. Procédé selon l'une des revendications 1 et 5 à 9, caractérisé par le fait que la masse de couchage CF contient, en plus du pigment minéral réactif chromogène, jusqu'à 30 % en poids ― rapporté à la teneur totale en pigment, calculé en partie de poids de matières sèches ― d'un pigment non réactif chromogène choisi parmi le groupe carbonate de calcium, kaolin, sulfate de barium, talc, chlorite, silicate précipité, hydroxyde d'aluminium et amidon inhibé ou d'un mélange de ces composés.
  11. Procédé selon l'une des revendications 5 à 10, caractérisé par le fait que l'on applique la masse de couchage CF en une quantité d'application qui est comprise entre 4 et 9 g/m2 (calculée en partie de poids de matières sèches).
  12. Procédé selon l'une des revendications 1 et 5 à 11, caractérisé par le fait que l'on applique la masse de couchage CF en une quantité d'application qui est comprise entre 4 et 7 g/m2 (calculée en partie de poids de matières sèches).
  13. Procédé selon l'une des revendications 2 et 5 à 8, caractérisé par le fait que la masse de couchage CF contient, en plus des accepteurs de colorant organiques, jusqu'à 90 % en poids ― rapporté à la teneur totale en matières solides ― d'un pigment non réactif chromogène choisi parmi le groupe carbonate de calcium, kaolin, sulfate de barium, talc, chlorite, silicate précipité, hydroxyde d'aluminium et amidon inhibé ou d'un mélange de ces composés.
  14. Procédé selon l'une des revendications 5 à 8 et 13, caractérisé par le fait que l'on applique la masse de couchage CF en une quantité d'application qui est comprise entre 3 et 6 g/m2 (calculée en partie de poids de matières sèches).
  15. Procédé selon l'une des revendications 3 et 6, caractérisé par le fait que la teneur en matières solides de la masse de couchage CB est comprise entre 15 et 45 %.
  16. Procédé selon l'une des revendications 3, 6, 14 et 15, caractérisé par le fait que la préparation aqueuse est une masse de couchage CF.
  17. Procédé selon la revendication 16, caractérisé par le fait que la masse de couchage CF contient comme accepteurs de colorants des pigments réactifs chromogènes minéraux ou des substances organiques à réaction acide solubles dans l'huile.
  18. Procédé selon l'une des revendications 16 et 17, caractérisé par le fait que la teneur en matières solides de la masse de couchage CF est > 40 % en poids.
  19. Procédé selon l'une des revendications 3, 6, 8 et 15 à 17, caractérisé par le fait qu'avant application de la masse de couchage CB on soumet au moins la face de la bande de papier qui est opposée à la face prévue pour l'application de la masse de couchage CB, à un calandrage.
  20. Procédé selon l'une des revendications 1 à 19, caractérisé par le fait qu'il est mis en oeuvre sur une machine de papeterie.
EP93917650A 1992-07-27 1993-07-26 Procede de fabrication de bandes de papier a couches de reception ou d'emission utiles comme papiers d'enregistrement sensibles a la pression Revoked EP0652808B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE19924224719 DE4224719C3 (de) 1992-07-27 1992-07-27 Verfahren zur Herstellung einer eine CF-Schicht aufweisenden Papierbahn für druckempfindliches Durchschreibepapier
DE4224716 1992-07-27
DE4224719 1992-07-27
DE19924224716 DE4224716C3 (de) 1992-07-27 1992-07-27 Verfahren zur Herstellung einer eine CF-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere
DE4224718 1992-07-27
DE19924224718 DE4224718C2 (de) 1992-07-27 1992-07-27 Verfahren zur Herstellung einer eine CB-Schicht aufweisenden Papierbahn für druckempfindliche Aufzeichnungspapiere
PCT/EP1993/001982 WO1994002258A1 (fr) 1992-07-27 1993-07-26 Procede de fabrication de bandes de papier a couches de reception ou d'emission utiles comme papiers d'enregistrement sensibles a la pression

Publications (2)

Publication Number Publication Date
EP0652808A1 EP0652808A1 (fr) 1995-05-17
EP0652808B1 true EP0652808B1 (fr) 1997-04-16

Family

ID=27204016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93917650A Revoked EP0652808B1 (fr) 1992-07-27 1993-07-26 Procede de fabrication de bandes de papier a couches de reception ou d'emission utiles comme papiers d'enregistrement sensibles a la pression

Country Status (7)

Country Link
US (1) US5597612A (fr)
EP (1) EP0652808B1 (fr)
JP (1) JPH07509669A (fr)
DE (1) DE59306209D1 (fr)
ES (1) ES2102049T3 (fr)
FI (1) FI106391B (fr)
WO (1) WO1994002258A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5599393A (en) * 1995-04-25 1997-02-04 Macmillan Bloedel Limited Metering rod coaters
EP0903247A1 (fr) * 1997-09-19 1999-03-24 Simplex AG Bern Procédé et dispositif pour le revêtement partiel d'une bande de papier avec une masse sensible à la pression
EP1743976A1 (fr) * 2005-07-13 2007-01-17 SAPPI Netherlands Services B.V. Papiers enduits pour l'impression offset
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
US20130189457A1 (en) * 2012-01-23 2013-07-25 International Paper Company SEPARATED TREATMENT OF PAPER SUBSTRATE WITH MULTIVALENT METAL SALTS AND OBAs

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* Cited by examiner, † Cited by third party
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
FR2106202A5 (fr) * 1970-08-31 1972-04-28 Appleton Paper Inc
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

Also Published As

Publication number Publication date
JPH07509669A (ja) 1995-10-26
FI106391B (fi) 2001-01-31
FI950283A0 (fi) 1995-01-23
DE59306209D1 (de) 1997-05-22
EP0652808A1 (fr) 1995-05-17
WO1994002258A1 (fr) 1994-02-03
US5597612A (en) 1997-01-28
ES2102049T3 (es) 1997-07-16
FI950283A (fi) 1995-01-23

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