EP0505362A1 - Ruban a transfer thermique. - Google Patents

Ruban a transfer thermique.

Info

Publication number
EP0505362A1
EP0505362A1 EP90915090A EP90915090A EP0505362A1 EP 0505362 A1 EP0505362 A1 EP 0505362A1 EP 90915090 A EP90915090 A EP 90915090A EP 90915090 A EP90915090 A EP 90915090A EP 0505362 A1 EP0505362 A1 EP 0505362A1
Authority
EP
European Patent Office
Prior art keywords
binder
ribbon according
ribbon
layer
dye
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
EP90915090A
Other languages
German (de)
English (en)
Other versions
EP0505362B1 (fr
Inventor
Unterrichter-Worthmann Joh Von
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.)
Eastman Kodak Co
Original Assignee
Siemens AG
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
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0505362A1 publication Critical patent/EP0505362A1/fr
Application granted granted Critical
Publication of EP0505362B1 publication Critical patent/EP0505362B1/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
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents

Definitions

  • an ink which can be transferred under the action of heat is transferred from an ink ribbon to a recording material, in particular paper.
  • a suitable ink ribbon consists of a carrier material, for example a flexible film and a heat-sensitive ink layer applied thereon. This usually contains a pigment, for example carbon black, which is dispersed in a readily melting binder, for example wax.
  • thermocouples The heat required for ink transfer is supplied by the printer through several individually controllable thermocouples. These can be arranged, for example, in matrix form on a printhead or in a cell shape on a so-called Thermoka m.
  • DE-OS 34 16 067 proposed that in addition to the colorant in microencapsulation, a gas-forming component which could be heated under the influence of heat was also added to the easily melting binder Generates gas that supports the transfer of the ink.
  • this ribbon leaves an improved color transfer with respect to color adhesion and print quality can be achieved on paper with a surface that is not quite flat. Good color saturation is observed in the center of a generated pixel or character.
  • the structure of the paper surface comes to light at the edges of the pixels or characters generated and thus produces more or less frayed print edges depending on the paper quality. This reduces the optical quality of the printed image, in particular when a high resolution is required or an even rougher paper is used.
  • an ink ribbon which has at least one
  • a carrier in particular a film
  • thermolabile component which releases a gas and heat during decay to support the transfer of ink components onto a recording medium.
  • ribbon according to the invention can even on rough Paper (rougher or less than 30 Bekk seconds) pixels or characters of high print quality are produced, which have both high color saturation and sharp edges that are clean and independent of the structure of the paper.
  • the colorants contained in the binder are pigment dyes and the further dye, which can be a sublimable dye. This can be incorporated into the binder without any problems and in a stable manner.
  • the printing process itself is no longer a purely "mechanical" transfer of the binding agent, including the color pimentos contained therein. Rather, the decay of the thermolabile component is controlled by the supply of energy (during printing). The released gas presses the binder and the color pigments it contains onto the paper or the recording medium.
  • the additional dye is evaporated or sublimed by the heat of decay and can penetrate even deeper into the paper surface in the gas phase. This penetration is further supported by the gas released from the thermolabile component. This means that there is no longer any need for good contact between the ink ribbon and the recording medium and is therefore largely independent of the surface of the recording medium or of the paper. Since the further dye preferentially precipitates on the paper which is cooler in comparison to the melted binder, a coloring takes place above all in the areas of an image point or character on the recording medium which do not reach and cover with the binder during the printing process become.
  • a clever color selection of the dye to be transferred in gaseous form enhances the color of the printed image.
  • black color pigments for example, blue tones are suitable as further or further dyes.
  • the color enhancement can also be achieved by a corresponding color pigment mixture, for example by adding "Berlin blue”, “Milori blue” or “reflex blue” to carbon black.
  • corresponding color pigments cyan, magenta, Yellow, black
  • gaseous transferable dyes can be organic or inorganic in nature.
  • the brilliance of the printed image can be increased with fluorescent dyes.
  • a dye which can be sublimed below 200 ° C. is advantageously used.
  • a dye which can be sublimed, for example, at 160 ° C. can easily be converted into the gas phase during the printing process and is nevertheless sufficiently stable or not too volatile on the ink ribbon.
  • which can be sublimed in this area are selected, for example, from the class of anthraquinone dyes, for example "disperseblue 14" (1- (methylamino) anthraquinone).
  • thermolabile components are, for example, those which chemically decompose under the action of radiation and / or heat to form a gas.
  • Such compounds can, for example, be selected from the group of azo compounds. It is also possible to influence the decomposition of the azo compounds in mixtures with respect to the required temperature and reaction rate with the aid of further catalytically active components.
  • a well-suited thermolabile compound is azodicarbonamide, which only releases toxicologically harmless substances when it decomposes, for example gases N 2 , C0 or C0 2 , which are non-corrosive and odorless. The coloring is also not influenced by decomposition residues.
  • azo type foams are azobisisobutyronitrile (AIBN), diazoaminobenzene (DAB), and the like.
  • AIBN azobisisobutyronitrile
  • DAB diazoaminobenzene
  • the amounts of gas that can be released are between 100 and 220 ml / g, depending on the foam mixture, and the amounts of decay heat are about 300 to 900 J / g (reaction enthalpy).
  • So-called kickers, starter compounds or mixtures thereof are used as catalytically active components for influencing the decomposition temperature of the azo compounds.
  • These can be selected from inorganic compounds such as zinc oxide, hydrazine or activated carbon, from aromatic Matic and non-aromatic hydrazo ⁇ and sulfonyl compounds, for example p-toluenesulfonyl hydrazide (TSH), benzenesulfonyl hydrazide (BSH), p, p'-oxybisbenzenesulfonyl hydrazide, dinitrosopentamethylene tetramine (PNPT), zinc benzene sulfinate or from other organic explosives.
  • Solid foam mixtures based on ADC which are commercially available are also suitable.
  • Such mixtures can be set to reaction temperatures of, for example, 80 to 220 ° C.
  • mixtures which are set to reaction temperatures above 130 * 0 are advantageously used for the ink ribbon according to the invention, which is the lower limit for safe processing and stable storage of the ink ribbon or whose components have been produced. In the finished ribbon, they remain stable for at least 4 weeks even during storage at 50 "C.
  • the structure of the ink ribbon can be realized in several or only in one layer on the carrier.
  • the latter represents a microdispersion of the finely divided solid constituents in the binder.
  • coloring agents for example pigments or carbon black
  • thermolabile gas-releasing component optionally in admixture with a a catalytically active component, for example an azo compound / kicker mixture and 2 to 5% by weight of a gaseous transferable dye (thermal transfer dye).
  • the main constituent of the binder is a wax, which is selected from the group of hard waxes, paraffins or microwaxes and which is contained in the entire layer in an amount of approximately 40 to 80 percent by weight.
  • a wax which is selected from the group of hard waxes, paraffins or microwaxes and which is contained in the entire layer in an amount of approximately 40 to 80 percent by weight.
  • Refined montan waxes, ester waxes or natural waxes such as carnauba wax can be used as hard waxes.
  • this hard wax is modified with further binder components.
  • resins such as modified rosin or hydrogenated hydrocarbon resins.
  • oils, fats or thermoplastic polymers are contained in a proportion of 5 to 10 percent by weight as plasticizers.
  • Higher fatty acids and their derivatives for example metal salts, esters or amides, for example stearic acid esters, lauric acid amide or oleic acid amide, may be present as further additives with 3 to 15 percent by weight.
  • binder mixtures are known from the prior art and are already commercially available as color waxes in a mixture with dyes. However, they must be chemically matched to the foamer.
  • a foamer can be made hydrophilic or hydrophobic or catalyzed with acid so that it has a lower decomposition temperature in an acidic environment.
  • the solidification, melting or dropping point of the binder mixture lie in a narrow interval, which is preferably set to 80 to 95 ° C.
  • the constituents mentioned are homogeneously incorporated and dispersed in the binder.
  • this mixture is brought to a temperature above the melting point of the binder Tem ⁇ , but is at least 20 ⁇ C below the reaction temperature of the gas-releasing component or Schumermischung and then applied with a doctor blade on the carrier.
  • This is, for example, a PETB or PBTB film (polyethylene terephthalate or polybutylene terephthalate) with a thickness of approx. 4 ⁇ m.
  • the film may not be provided with a protective layer, a so-called antisticking layer.
  • the layer thickness of the binder is determined by the doctor blade and set to approximately 3 to 5 ⁇ m.
  • an ink ribbon according to the invention with this single-layer structure has various advantages over a multi-layer structure to be described below.
  • an ink ribbon according to the invention can also be easily regenerated in the single-layer structure or also re-coated or re-coated and used again for one or more further uses.
  • ribbons for printing processes with a Thermoka m the. After the printing process represent a negative of the printed paper and therefore have almost as much unused ribbon area as the printed paper has unprinted areas, this is particularly profitable.
  • the "copy" of the printing process is "destroyed", which is particularly important in the case of data worth protecting.
  • the regeneration of an ink ribbon according to the invention in a single-layer structure can be carried out with a scraper under slight pressure and elevated temperature.
  • the same limit values apply to the temperature as to the manufacturing process.
  • the maximum number of possible regenerations depends on the amount of unused ribbon area and the
  • Thickness of the layer containing the ink components or more simply according to the amount of the layer material still available.
  • the gas-releasing component is arranged together with the catalytically active component in a further binder layer beneath the binder layer containing the color pigments and the dye.
  • the same composition is selected for the latter upper layer as in the single-layer structure.
  • the lower layer which is usually applied directly to the carrier, contains the foamer or the foamer mixture in a finely divided form in a further binder.
  • the latter can be an organic poly or copolymer and only has to be compatible with the foam mixture.
  • the same requirements apply to the foamer as in the single-layer structure, in particular its decay temperature be adapted to the gaseous dye and to the melting point of the binder layer containing the dye and the color pigments.
  • Other ink properties that are matched to the material to be printed, or coloring agents are not required for the foaming layer.
  • a well-suited binder for an azo group-containing foaming mixture is ethylene-vinyl acetate copolymer (EVA).
  • EVA ethylene-vinyl acetate copolymer
  • Water can be used to prepare a dispersion into which about 5 to 25% by weight, preferably 15% by weight, foaming mixture can easily be stirred. The whole is then applied cold to the support so that the dry layer has a thickness of 0.3 to 2.0 microns. The layer dries within a few seconds at room temperature.
  • the EVA binder gives very good adhesion both to the PETB and PBTB films used and to the wax mixtures used, so that a stable three-layer structure for the ink ribbon is produced. This is particularly important for high-speed printers, where such an ink ribbon is exposed to high mechanical loads.
  • FIG. 1 shows in cross section an ink ribbon according to the invention in the one-layer structure (FIG. 1) and in the two-layer structure (FIG. 2).
  • a layer 4 is now applied to it, which consists of a commercially available color wax (binder mixture and pigments) into which about 5 percent by weight of a submissible dye (for example "disperse blue 14") has been stirred.
  • the layer is applied with a doctor blade at 90 * C. After the wax or binder has solidified, the ink ribbon is finished. The adhesion of the layers to one another is very good. In printing tests using the thermal transfer printing method, a sharp typeface is produced on rough paper (for example 30 Bekk seconds), the pixels or characters of which have sharp edges.
  • a foaming agent mixture (Porofor VP-KL3-2014 and Porofor ADC-K, 1: 1, Bayer) and a sublimable dye are stirred into a color wax mixture (Hoechst) at 85 ° C. and mixed. Upon reaching a microdispersion of the mixture to a 3.5 micron thick with antisticking-coating is provided tung film 1 (PETB, Toray) at 90 * C applied.
  • a foaming agent mixture Porofor VP-KL3-2014 and Porofor ADC-K, 1: 1, Bayer
  • Hoechst color wax mixture
  • the layer 2 After solidification, the layer 2 has a thickness of 4.2 ⁇ m.
  • the adhesion of layers 1 and 2 to one another is very good.
  • the decomposition beginning of the layer 2 is about DSC to 140 "C (maximum at 152 * C.). Thermal transfer printing tests with this ribbon also give a very good printing quality with high resolution and sharp edges.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Il est proposé un nouveau ruban pour un procédé d'impression par transfert thermique, lequel comporte sur un film support au moins des liants, des pigments colorés ainsi qu'au moins un autre colorant qui est transférable sous forme gazeuse. Le ruban peut être utilisé pour l'impression de papier rugueux (également du papier de recyclage), ce qui permet d'obtenir aussi une haute qualité d'impression homogène.
EP90915090A 1989-12-15 1990-10-24 Ruban a transfer thermique Expired - Lifetime EP0505362B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3941517 1989-12-15
DE3941517A DE3941517A1 (de) 1989-12-15 1989-12-15 Thermotransferfarbband
PCT/DE1990/000808 WO1991008908A1 (fr) 1989-12-15 1990-10-24 Ruban a transfer thermique

Publications (2)

Publication Number Publication Date
EP0505362A1 true EP0505362A1 (fr) 1992-09-30
EP0505362B1 EP0505362B1 (fr) 1995-07-19

Family

ID=6395564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90915090A Expired - Lifetime EP0505362B1 (fr) 1989-12-15 1990-10-24 Ruban a transfer thermique

Country Status (4)

Country Link
EP (1) EP0505362B1 (fr)
JP (1) JPH05501525A (fr)
DE (2) DE3941517A1 (fr)
WO (1) WO1991008908A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692381B1 (fr) 1992-06-15 1997-01-24 Bull Sa Systeme de transmission de donnees entre un bus d'ordinateur et une memoire de masse.
DE4300982C2 (de) * 1993-01-15 1996-05-15 Siemens Nixdorf Inf Syst Thermotransferdruckverfahren zur Verbesserung des Druckbildes auf Papier mit rauher Oberfläche

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4491432A (en) * 1982-12-30 1985-01-01 International Business Machines Corporation Chemical heat amplification in thermal transfer printing
US4565737A (en) * 1983-05-02 1986-01-21 Canon Kabushiki Kaisha Heat-sensitive transfer material
US4549824A (en) * 1983-12-30 1985-10-29 International Business Machines Corporation Ink additives for efficient thermal ink transfer printing processes
US4525722A (en) * 1984-02-23 1985-06-25 International Business Machines Corporation Chemical heat amplification in thermal transfer printing
DE3736728A1 (de) * 1987-10-29 1989-05-11 Siemens Ag Druckertinte
US4897310A (en) * 1987-12-15 1990-01-30 Siemens Aktiengesellschaft Inking ribbon for transferring color under the influence of heat

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9108908A1 *

Also Published As

Publication number Publication date
DE3941517A1 (de) 1991-06-27
WO1991008908A1 (fr) 1991-06-27
JPH05501525A (ja) 1993-03-25
DE59009424D1 (de) 1995-08-24
EP0505362B1 (fr) 1995-07-19

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