EP1755901A1 - Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede - Google Patents

Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede

Info

Publication number
EP1755901A1
EP1755901A1 EP05756012A EP05756012A EP1755901A1 EP 1755901 A1 EP1755901 A1 EP 1755901A1 EP 05756012 A EP05756012 A EP 05756012A EP 05756012 A EP05756012 A EP 05756012A EP 1755901 A1 EP1755901 A1 EP 1755901A1
Authority
EP
European Patent Office
Prior art keywords
carrier substrate
thermal reaction
reaction layer
recording material
smoothing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05756012A
Other languages
German (de)
English (en)
Other versions
EP1755901B1 (fr
EP1755901B2 (fr
Inventor
Michael Boschert
Georg Streif
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Papierfabrik August Koehler SE
Original Assignee
Papierfabrik August Koehler SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=34971127&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1755901(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Papierfabrik August Koehler SE filed Critical Papierfabrik August Koehler SE
Publication of EP1755901A1 publication Critical patent/EP1755901A1/fr
Publication of EP1755901B1 publication Critical patent/EP1755901B1/fr
Application granted granted Critical
Publication of EP1755901B2 publication Critical patent/EP1755901B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers

Definitions

  • the invention relates to a method according to the preamble of claim 1 for producing a heat-sensitive recording material. Furthermore, the invention relates to a heat-sensitive recording material according to the preamble of claim 17, which is produced by such a method.
  • Heat sensitive recording materials have long been known in the art. They generally have a thin flat carrier substrate and a thin thermal reaction layer applied thereon. Paper, paper with a proportion of plastic fibers or also a suitable plastic film is usually used as the carrier substrate.
  • the thin thermal reaction layer applied to the carrier substrate contains, in finest distribution, a color former, for example crystal violet lactone, and a color developer, for example in the form of an acidic reactant.
  • the color formers and color developers are dispersed in a binder which is not or only insignificantly meltable when exposed to heat.
  • a printhead of a thermal printer acts directly on the heat-sensitive thermal reaction layer, the heat effect largely melting and diffusing the color formers and color developers contained in the binder, which react with one another with discoloration.
  • the binder remains largely unchanged in the form of a solid matrix.
  • the discoloration reaction between the color former and the color developer in the thermal reaction layer occurs only within a fraction of a second at the heated point.
  • a carrier substrate is usually used which has as uniform a distribution of the fibers as possible, a uniform surface morphology and an absorbency which is as uniform as possible when viewed over the surface.
  • the roughness of the surface of the carrier substrate, to which the thermal reaction layer is applied is adjusted during the production of the carrier substrate such that the thermal reaction layer can adhere well to the surface of the carrier substrate.
  • Suitable processes with which the application suspension is applied to the carrier substrate are also intended to achieve as uniform a distribution as possible of the thermoreaction layer which subsequently results on the surface of the carrier substrate.
  • a wide variety of processes are used for this, for example the curtain coating process, application with rollers or blades, or so-called doctoring.
  • the recording materials are additionally smoothed after drying in order to achieve a surface that is as homogeneous, smooth but matt as possible.
  • a so-called mole smoothing unit (Matt online smoothing unit) is usually used as the smoothing unit.
  • This is a pair of rollers between which the carrier substrate with the applied thermal reaction layer is passed.
  • the rollers are made of metal, for example.
  • pairs of rollers are also used in which one of the two rollers is provided with a paper covering, a plastic covering or a rubber covering, while the other roller is made, for example, from surface-hardened steel or chilled cast iron. If necessary, pairs of rollers are also used in which the lateral surfaces of both rollers are elastically deformable.
  • the raw material used for the production of the carrier substrate also has a significant effect on the creation of the mottling effect.
  • the type of cellulose, the sizing agent and the pigments of the paper stock influence the properties of the carrier substrate produced therefrom and thus the adhesiveness and homogeneity of the thermal reaction layer applied to the carrier substrate.
  • a shoe smoothing value is a smoothing unit consisting of a roller, which is usually made of surface-hardened steel, and an elastic press jacket which serves as a pressing element and, like the roller, moves with the carrier substrate when the carrier substrate passes through the gap between the roller and the Press jacket is passed through.
  • the press jacket is hollow cylindrical, rotatably supported at its open ends and is pressed against the roller which is arranged opposite with the aid of a so-called pressure shoe.
  • a hydraulic cushion is usually formed between the inner circumferential surface of the press cover and the pressure shoe, with which the press cover is pressed as evenly as possible against the roller that is carried along.
  • Such shoe smoothing units are usually only used in the production of cardboard boxes in order to prevent the cardboard boxes from compacting during smoothing, the shoe smoothing units smoothing the surfaces of the cardboard boxes before they are provided with the outer layers to be printed.
  • the thermal reaction layer of recording materials smoothed with the aid of the shoe smoothing device shows a significantly lower tendency to form the mottling effect compared to recording materials which have been smoothed in a conventional manner, as is the case have impressively demonstrated a wide variety of test series.
  • the recording material shows a uniformly matt surface, which tends to be slightly mottled even after printing.
  • the contact pressure with which the dried carrier substrate with the applied thermal reaction layer is pressed against the roller is set in such a way that a possible pre-reaction of the thermal reaction layer is negligibly small or does not occur.
  • This measure ensures that the finished recording material does not show any color veil caused by pre-reactions of the color formers and color developers in the thermal reaction layer, for example a gray veil, but the recording material shows its desired basic color, for example white, after passing through the shoe smoothing unit.
  • the contact pressure is chosen so high that there is sufficient surface smoothness with the desired mattness.
  • both the conveying speed of the carrier substrate through the smooth shoe, the contact pressure with which the carrier substrate with the applied thermal reaction layer is pressed against the roller, and the effective contact surface with which the carrier substrate is pressed against the roller during smoothing be coordinated so that the recording material can be produced with a high surface quality.
  • the conveying speed, the contact pressure and the effective contact surface are preferably selected so that the thermal reaction layer on the carrier substrate is only heated to such an extent when passing through the shoe smoothing unit that no visible discoloration reactions of the thermal reaction layer occur yet.
  • the maximum permissible temperature for a conventional heat-sensitive recording material is in a range from about 60 to 70 ° C., at which no visible discoloration reaction of the thermal reaction layer occurs yet.
  • the contact pressure can in particular also be increased in order to obtain a surface that is as smooth as possible.
  • you can the three process parameters of conveying speed, contact pressure and effective contact surface can be set to one another in a defined manner by using the discoloration reaction of the thermal reaction layer, so that a high quality of the recording material can be set with the lowest degree of discoloration.
  • the conveying speed of the carrier substrate through the smooth shoe is in a range from approximately 700 to 1750 m / min. At these conveying speeds, it is ensured on the one hand that the thermal reaction layer does not show any of the discoloration reactions described above, but that the recording material can be produced at the same time with a sufficiently high production speed.
  • the line load of the shoe smoothing plant i.e. the load on the carrier substrate in the shoe smooth, which acts along a line of contact transverse to the conveying direction of the carrier substrate, is preferably in a range from about 40 N / mm to 650 N / mm. It has been shown that most of the reactants in the thermal reaction layer are only warmed up by the high compressive forces at a higher effective line load to such an extent that a discoloration reaction occurs.
  • the nip width of the shoe smoothing unit i.e. seen the length in the conveying direction of the carrier substrate, along which the roller and the press jacket bear against the carrier substrate, chosen such that the nip width is in a range from 30 to 50 mm for a web width of the carrier substrate of 3500 to 4500 mm. Due to the significantly larger nip width of the shoe smoothing compared to the prior art, which is in the prior art in a range of 2 to 4 mm, the maximum effective contact pressure can be set comparatively low in the method according to the invention, since the recording material over a longer period Period is smoothed in shoe smoothing.
  • the carrier substrate with the applied thermal reaction layer is dried immediately before smoothing only to such an extent that the moisture content of the carrier substrate with the applied thermal reaction layer is in a range of 4 to 8% by weight. lies.
  • the dried carrier substrate with the applied thermoreaction layer before smoothing in the shoe smooth on its back facing away from the thermoreactive layer is moistened again dry the moistened carrier substrate with the applied thermal reaction layer before smoothing in the shoe smooth to the desired moisture content.
  • the application suspension forming the subsequent thermal reaction layer is preferably applied to the carrier substrate by brushing.
  • a wide variety of known methods can be used for this purpose, for example applying the application suspension by doctor blade, with the aid of rollers or rollers or also with the aid of so-called blaids.
  • Another coating method with which the application suspension can be applied to the carrier substrate is the so-called curtain coating method.
  • the carrier substrate is guided through a curtain coating device in which the application suspension is applied to the surface of the carrier substrate in the form of a curtain or veil, the surface tension of the application suspension evenly distributing it on the surface to be coated.
  • the carrier substrate is preferably smoothed in a defined manner immediately prior to the application of the application suspension forming the subsequent thermoreaction layer. This gives the carrier substrate a uniformly homogenized surface on which the application suspension adheres well when applied.
  • thermoreaction layer on the flat carrier substrate In order to achieve a distribution of the thermoreaction layer on the flat carrier substrate that is as uniform as possible, in a particularly preferred variant of the method according to the invention it is proposed to apply an intermediate layer to the surface of the carrier substrate to which the thermoreaction layer is to be applied, with which the rough surface of the carrier substrate is leveled and homogenized.
  • the intermediate layer can be specifically adjusted so that it also serves as thermal insulation between the carrier substrate and the thermal reaction layer applied to the intermediate layer.
  • This heat-insulating effect also accelerates the discoloration reaction, since the amount of heat applied by the thermal print head to the thermal reaction layer during printing is reflected back from the intermediate layer back into the thermal reaction layer, while at most a small part of the amount of heat introduced is transferred to the carrier substrate and is radiated outward therefrom ,
  • the carrier substrate with the applied intermediate layer is additionally smoothed, for example by a coating, before the application suspension forming the subsequent thermal reaction layer is applied conventional mole calender.
  • the carrier substrate which is usually a paper or plastic web, can either have been produced beforehand and can be supplied, for example in the form of rolls, to the system carrying out the method according to the invention. However, it is particularly advantageous to produce the recording material online on a single machine.
  • the carrier substrate is already made from known raw materials on the same system, dried, pressed and smoothed and then fed to the corresponding devices for application of the intermediate layer or for application of the application suspension forming the subsequent thermal reaction layer.
  • the carrier substrate immediately before the application of the intermediate layer or before the application of the application suspension forming the subsequent thermal reaction layer, but on a separate system from the system carrying out the method according to the invention, so that the system for applying the intermediate layer or the thermal reaction layer can be optimally adjusted in its process parameters, in particular the conveying speed.
  • the production of the carrier substrate immediately before the application of the intermediate layer or before the application of the application suspension forming the subsequent thermal reaction layer has the advantage that online already during the production of the carrier substrate.
  • the properties of the carrier substrate can be specifically adjusted and, if necessary, readjusted in order to be able to produce the highest quality heat-sensitive recording material possible.
  • a paper web is preferably used as the carrier substrate.
  • a plastic film or also a paper web with a proportion of plastic fibers is also possible to use as the carrier substrate.
  • the invention relates to a heat-sensitive recording material with a carrier substrate and a thermal reaction layer containing a color former and a color developer.
  • the heat-sensitive recording material is preferably produced by a process as described in the various process variants described above.
  • the thermal reaction layer of the recording material according to the invention has been particularly preferably applied to the carrier substrate by the curtain coating method.
  • the use of the curtain coating process has the advantage that the recording material can be produced on the one hand at a very high production speed, while on the other hand a particularly fine and targeted metering and formation of the thermal reaction layer is possible.
  • the paper weight of the finished recording material is preferably in a range from 45 to 120 g / m 2 .
  • the whiteness or the white content of the finished recording material if it is a white recording material, measured in accordance with ISO 2469, is in a range from 85 to 98%.
  • a paper web was produced as a carrier substrate with an intermediate layer applied on a conventional paper production machine.
  • the paper web thus produced was then fed to the installation for applying the thermal reaction layer.
  • the aqueous application suspension forming the subsequent thermal reaction layer was applied to the carrier substrate using the curtain coating process.
  • the viscosity of the aqueous application suspension was 450 mPas (according to Brookfield, 100 rpm, 20 ° C).
  • the surface tension of the application suspension was 46 mN / m (statistical ring method).
  • the basis weight of the paper web was 43 g / m 2 .
  • the paper web was passed through the curtain coating device at a conveying speed of 1200 m / min.
  • an aqueous application suspension was applied in a known manner in order to form a thermal reaction layer with a weight of 5.8 g / m 2 (oven-dry).
  • the coated paper web was dried in the customary manner.
  • the flat side of the paper web opposite the cured thermal reaction layer was then moistened again and dried to such an extent that the moisture content of the paper web with the dried thermal reaction layer was approximately 7% by weight. This should ensure that the material properties of the paper web are as constant as possible over the entire width of the paper web.
  • the shoe smoothing unit was a shoe smoothing unit from Voith ® in the form of a so-called shoe calender.
  • the shoe smoothing unit used in the Voith ® test facility was a smoothing unit that was equipped with a cast iron roller and a pressure shoe unit.
  • the cast iron roller had a diameter of 1067 mm.
  • the pressure shoe unit was formed by a press jacket made of an elastomer with a diameter of 1100 mm, which was held on a holding device with rotatable clamping rings. in the
  • Pressure shoe a hydrostatic press zone could be formed.
  • the paper web coated with the thermoreaction layer was then passed through the smoothing gap of the shoe smoothing unit, the contact pressure with which the press jacket was pressed against the other roller being set such that a maximum line load of 600 N / mm and a minimum line load of 50 N / mm resulted.
  • the nip width depending on the size of the printing shoe was set to 40 mm with a web width in front of the calender of 800 mm.
  • the table below shows parameters of various heat-sensitive recording materials produced by the process according to the invention in comparison with recording materials which have been produced in a conventional manner.
  • optical density 1 the optical density 2
  • white content the smoothness measured according to Bekk and the pre-reactions were listed.
  • the patterns marked 100 and 300 were not smoothed.
  • the samples marked 101 to 105 were smoothed in a smoothing unit with a roller with a hard surface and a roller with an elastic surface, which had a Shore hardness of 90 ° Sh (D).
  • the samples marked with the number sequence 201 to 206 were smoothed in a smoothing unit with two rollers, the surfaces of which were each elastic and had a Shore hardness of 90 ° Sh (D).
  • optical density 1 and the optical density 2 are used to indicate how quickly a thermal paper reacts.
  • the optical densities were measured in each case with a Macbeth D 19 C remission densitometer, which measures the difference in contrast between the uncolored and heat-blackened measuring surface. The higher the measured value, the greater the blackening of the heat-sensitive recording material.
  • the optical density 1 indicates the maximum degree of blackening that occurs with a specific energy application (for example, obtained by an energization time of 1 millisecond). In order to obtain the optical density 2, the heat-sensitive recording material is treated under the same conditions but with half the energization time.
  • the white content which was determined in accordance with ISO 2469, it can be seen that a higher white content can be achieved with the method according to the invention than with the conventional smoothing method.
  • all of the samples smoothed with the shoe smooth show white contents of at least 92.0%, while the comparison samples each showed white contents of less than 92.0%, for example the sample 105 with a white content of 90.0%.
  • the smoothness values measured according to Bekk in Bekk seconds for the samples produced by the method according to the invention essentially corresponded to the usual values of the comparison samples.
  • the samples produced by the process according to the invention showed a matte appearance compared to the comparative samples produced by the conventional processes, which was retained even after going through a printing process, with almost no mottling effect.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Abstract

L'invention concerne un procédé pour réaliser un matériau d'enregistrement sensible à la chaleur, lequel comporte un substrat et une couche de réaction thermique contenant un agent chromogène et un révélateur chromogène. Selon le procédé, une suspension de revêtement contenant les matières de départ de la couche de réaction thermique est appliquée sur le substrat, qui est ensuite séché. Puis, le substrat ainsi séché et recouvert de la couche de réaction thermique est guidé à travers une lisseuse à patin pour être lissé, ledit substrat étant soumis à une pression de serrage définie appliquée sur de grandes surfaces contre un rouleau entraîné. La présente invention porte également sur un matériau d'enregistrement réalisé selon ce procédé.
EP05756012.0A 2004-06-17 2005-06-10 Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede Expired - Lifetime EP1755901B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004029261A DE102004029261B4 (de) 2004-06-17 2004-06-17 Verfahren zur Herstellung eines wärmeempfindlichen Aufzeichnungsmaterials sowie ein durch das Verfahren hergestelltes Aufzeichnungsmaterial
PCT/EP2005/006246 WO2005123411A1 (fr) 2004-06-17 2005-06-10 Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede

Publications (3)

Publication Number Publication Date
EP1755901A1 true EP1755901A1 (fr) 2007-02-28
EP1755901B1 EP1755901B1 (fr) 2008-11-26
EP1755901B2 EP1755901B2 (fr) 2016-11-09

Family

ID=34971127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05756012.0A Expired - Lifetime EP1755901B2 (fr) 2004-06-17 2005-06-10 Procede pour realiser un materiau d'enregistrement sensible a la chaleur et materiau d'enregistrement realise selon ce procede

Country Status (6)

Country Link
US (1) US7833573B2 (fr)
EP (1) EP1755901B2 (fr)
AT (1) ATE415284T1 (fr)
DE (2) DE102004029261B4 (fr)
DK (1) DK1755901T4 (fr)
WO (1) WO2005123411A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005028822A1 (de) * 2005-06-22 2007-01-04 Voith Patent Gmbh Verfahren zum Herstellen von thermosensitivem Papier
US20120203618A1 (en) * 2011-02-07 2012-08-09 Upwave, Inc. Image printing systems and methods
DE102014107567B3 (de) 2014-05-28 2015-11-05 Papierfabrik August Koehler Se Wärmeempfindliches Aufzeichnungsmaterial
DE102015104306B4 (de) 2015-03-23 2018-05-03 Papierfabrik August Koehler Se Wärmeempfindliches Aufzeichnungsmaterial
DE102016113203B4 (de) 2016-07-18 2018-05-30 Papierfabrik August Koehler Se Wärmeempfindliches aufzeichnungsmaterial

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JPS55156086A (en) † 1979-05-23 1980-12-04 Kanzaki Paper Mfg Co Ltd Thermosensitive recording means
JPS57208296A (en) † 1981-06-19 1982-12-21 Fuji Photo Film Co Ltd Heat-sensitive recording paper
JPH0686153B2 (ja) * 1985-04-25 1994-11-02 富士写真フイルム株式会社 感熱記録材料の製造方法
JP2528905B2 (ja) * 1987-10-27 1996-08-28 三菱製紙株式会社 感熱記録体の製造方法
DE3920204A1 (de) * 1988-10-31 1990-05-10 Escher Wyss Gmbh Verfahren zum glaetten einer papier- oder kartonbahn
SE9500949L (sv) † 1995-03-16 1996-07-08 Korsnaes Ab Bestruken kartong för formade artiklar, produktionslinje för produktion av bestruken kartong, förfarande för framställning av bestruken kartong samt sätt att minska sprickbildningsbenägenheten vid vikning av en bestruken kartong
DE19715345A1 (de) * 1997-03-27 1998-10-01 Voith Sulzer Papiermasch Gmbh Verfahren zur Herstellung einer gestrichenen Warenbahn, insbesondere aus Papier oder Karton
US6332953B1 (en) * 1998-10-02 2001-12-25 International Paper Company Paper product having enhanced printing properties and related method of manufacture
DE10157690C1 (de) * 2001-11-24 2003-02-20 Voith Paper Patent Gmbh Verfahren und Kalander zum Glätten einer Faserstoffbahn
DE10158910B4 (de) † 2001-11-30 2005-12-22 Voith Paper Patent Gmbh Verfahren und Kalander zum Satinieren einer Papier- oder Kartonbahn
DE10241903A1 (de) * 2002-09-06 2004-03-11 Mitsubishi Hitec Paper Flensburg Gmbh Wärmeempfindliches Aufzeichnungsmaterial mit Schutzschicht, Verfahren zur Herstellung desselben und Streichmaschine zur Herstellung desselben
DE10255422B4 (de) † 2002-11-28 2004-10-28 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Behandeln einer Papier- oder Kartonbahn
DE102004011230B4 (de) † 2004-03-04 2005-12-29 Papierfabrik August Koehler Ag Verfahren zur Herstellung eines Thermopapiers
DE102004022416B4 (de) † 2004-05-06 2013-02-21 Voith Patent Gmbh Verfahren und Vorrichtung zum Behandeln einer Bahn aus Papier oder Karton

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Also Published As

Publication number Publication date
DE502005006074D1 (de) 2009-01-08
DK1755901T3 (da) 2009-03-30
EP1755901B1 (fr) 2008-11-26
ATE415284T1 (de) 2008-12-15
WO2005123411A1 (fr) 2005-12-29
EP1755901B2 (fr) 2016-11-09
DE102004029261B4 (de) 2006-05-18
US20080269047A1 (en) 2008-10-30
US7833573B2 (en) 2010-11-16
DK1755901T4 (da) 2017-02-20
DE102004029261A1 (de) 2006-01-12

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