EP0324011A1 - Thermal printing method and system - Google Patents

Thermal printing method and system

Info

Publication number
EP0324011A1
EP0324011A1 EP19880906541 EP88906541A EP0324011A1 EP 0324011 A1 EP0324011 A1 EP 0324011A1 EP 19880906541 EP19880906541 EP 19880906541 EP 88906541 A EP88906541 A EP 88906541A EP 0324011 A1 EP0324011 A1 EP 0324011A1
Authority
EP
European Patent Office
Prior art keywords
medium
coating
copy
substrate
images
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.)
Withdrawn
Application number
EP19880906541
Other languages
German (de)
French (fr)
Inventor
Shashi G. Talvalkar
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.)
NCR Voyix Corp
Original Assignee
NCR Corp
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 NCR Corp filed Critical NCR Corp
Publication of EP0324011A1 publication Critical patent/EP0324011A1/en
Withdrawn legal-status Critical Current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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/46—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/475—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves
    • B41J2/48—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material for heating selectively by radiation or ultrasonic waves melting ink on a film or melting ink granules
    • 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
    • B41M5/38257—Contact thermal transfer or sublimation processes characterised by the use of an intermediate receptor
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/46—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
    • B41M5/465—Infra-red radiation-absorbing materials, e.g. dyes, metals, silicates, C black

Definitions

  • the present invention relates to thermal printing and to an improved system for making an original and at least one good record copy during a printing operation.
  • the early thermal printing systems used a thermal print element energized to heat specific and precise areas of a heat-sensitive paper or like record material and thereby produce readable characters on the single sheet of paper.
  • the single sheet of paper includes material which is reactive to the applied heat and is described as a self-contained system.
  • thermal printing systems have included two separate sheets of paper or like record material, wherein each sheet is coated with a heat- sensitive reactive material.
  • the top or front sheet is usually a light weight tissue-type paper which is coated with a heat-sensitive material and the second sheet is preferably bond-type paper which is also coated with the heat-sensitive material.
  • the two sheets are then mated or collated in a manner wherein the uncoated side of the tissue paper is in contact with the coating on the bond paper.
  • the coated side of the tissue paper is adjacent and in close proximity to the thermal printing elements, or in certain applications, the elements may be in actual contact with the tissue paper.
  • the thermal elements are actuated to provide specific and precise marking or imaging on the papers in the process which enables the obtaining of a master sheet plus a readable copy.
  • the tissue paper could be coated on both the front and back sides so that the thermal printing elements are adjacent or in contact with the front coated side of the tissue paper and the back coating is in contact with the bond paper.
  • the thermal elements are actuated to provide the specific and precise marking or imaging on the two papers so as to be in readable form.
  • the tissue sheet and the bond sheet are arranged in manifold manner and the imaging is accomplished by transfer of the ink or like material in the coating of the tissue sheet onto the bond sheet when the thermal elements are actuated.
  • a thermal printing method of forming multiple copy images including the step of heating a thermal transfer coating on a first substrate in selective manner for transferring coating material in the form of images onto a second substrate placed adjacent said first substrate, characterized in that said coating includes material absorbing near infra-red energy, and further characterized by the steps of placing a copy medium adjacent the second substrate, and applying near infra-red energy over the copy medium for heating the images on said second substrate and transferring the images to said copy medium.
  • a heat-sensitive copy system including a first medium having a coating thereon, a second medium adjacent the first medium, means for selectively heating part of the coating on said first medium for transferring coating material onto the second medium in the form of images, characterized in that said coating is chosen to include near infra-red absorbing material, and further characterized by a copy medium adjacent the second medium, and means for producing near infra-red radiation for heating the second medium and transferring the coating images therefrom onto the copy medium.
  • Fig. 1 is a diagrammatic view of the first step of the thermal copy system of the present invention.
  • Fig. 2 is a diagrammatic view of one method of practicing the multiple ply concept
  • Fig. 3 is a similar view of another method of practicing the concept.
  • Figs. 1 and 2 illustrate in diagrammatic form the concept of a first process embodiment of the present invention wherein a thermal transfer ribbon 10 comprises a substrate 12 and a thermal transfer coating 14.
  • a thermal print head 16 provides heat for transferring portions of the coating 14 onto a record medium which comprises a substrate 20 having a coating 21 for receiving the coating material 14 in the form of images 22.
  • the second step involves the use of the record medium 18 and the application of heat from a near infra-red lamp 24 for creating or developing the image or images 22 onto a thermal paper 26 comprising a substrate 28 and a coating 30 for receiving the image or images 22 in one manner or process.
  • a second process embodiment of the invention is shown in Figs. 1 and 3 and utilizes the same first step as the first embodiment, namely the use of the record medium 18, followed by the second step of applying heat from the near infra-red lamp 24 for transferring the image or images 22 onto the back side of translucent paper 32 which comprises a substrate 34 for receiving an image or images as at 36 from the coating 21 on the substrate 20.
  • Near infra-red is defined as that portion of the electromagnetic spectrum between the wavelengths of 0.8 and 3 microns or is that invisible radiation with wavelengths in the range between 8,000 angstroms and 30,000 angstroms.
  • Example I describes the materials for use with the method wherein the transfer coating 14 is applied to one side of the substrate 12.
  • the transfer coating formulation 14 for the substrate 12 essentially consists of a hydrocarbon or polyethylene resin, one or more waxes, and a magnetic oxide or any other infra-red absorbing pigment.
  • a preferred coating composition is as follows: TABLE 1
  • the coating formulation 21 on the substrate 20 essentially consists of a dye, a phenolic resin, a wax, and a clay.
  • the thermal transfer coating 14 is applied to the base sheet 12 in the creation of the thermal transfer ribbon 10, and the receiving sheet 18 includes the substrate 20 and the coating formulation 21 as set out in Table 2 above.
  • the coating 14 is in the range of 1.36 to 2.27 Kgs. pounds dry weight per ream on sheet 12 and the coating 21 is in the range of 0.68 to 0.9 Kg dry weight per ream on sheet 20.
  • the concept of multiple copy imaging in the present invention utilizes a combination of two technologies.
  • the first technology used in the first step (Fig. 1) of each of the first and the second process embodiments involves the creation of a thermal print or image on a substrate by means of a thermal transfer ribbon 10 containing the coating 14 that includes the near infra-red absorbing material.
  • the second step or phase of the first process embodiment involves the passing of a sandwich consisting of the substrate carrying the thermal print or image produced in the first step and a thermally reactive material sheet, such as thermal paper 26, under the near infra ⁇ red lamp 24 to create an image in the thermal paper (Fig. 2).
  • a translucent paper 32 may be used and the sandwich is passed under the lamp 24 to transfer an image on the translucent paper which image is visible through the paper (Fig. 3).
  • the overall concept of the present invention relies on the characteristic of absorbency of the near infra-red in the transferred print which heats the thermal image and reactivates the top thermally sensitive material thereby creating a readable image through the translucent sheet, as in the case of the second process embodiment.
  • the image 22 produced on the receiving substrate 20 (Fig. 1) requires the presence of near IR absorbing material which becomes hot when exposed to the near IR lamp 24.
  • the thermally reactive material combines with the hot dot or hot character to produce a clean, clear image on the paper (Fig. 2).
  • the translucent sheet 32 which does not contain a coating, the image is created by a partial transfer of the thermally reactive material from the receiving sheet 18 onto the back side of the translucent sheet 32 to provide a readable image 36 through such sheet (Fig. 3).
  • the present invention provides a method for making multiple copies by means of thermal printing equipment wherein such method eliminates the thickness sensitivity of materials currently used for multiple copy printing.
  • a readable copy of the image was produced when a 10.88 Kg coated sheet (60 cm by 92 cm) was employed as the thermal paper.
  • the invention is practical and simple for use where a limited amount of space is available for the necessary hardware since the only device required in the housing enclosure of the thermal transfer printer will be the near IR lamp 24.
  • the various ingredients utilized in the thermal transfer coating 14 are further identified and are available from the noted sources.
  • the Ceramid wax is a fatty acid derived amide wax available from Glyco Chemicals, Inc. and WB-17 is an oxidized, isocyanated hydrocarbon wax from Petrolite Corporation.
  • AC-617 is a low molecular weight polyethylene available from Allied Chemical Corporation and Piccotex-75 is a hard, color stable, substituted styrene copolymer resin from Hercules, Inc.
  • the iron oxide is available from BASF
  • the Soya Lecithin is a wetting agent, oil-like extract of soybean from Capricorn Chemical
  • the Slip Aid is a 20% dispersion of polymeric or high melting point polyethylene wax in xylene from Daniel Products.
  • the bisphenol (4,4 - isopropyli-denediphenol) as a reactive material of the phenol group, is available from Dow Chemical Company.
  • the black color forming dye of the fluoran group is Pergascript from Ciba- Geigy Corporation, or S205 from Yamada Chemical Company, or N-102 from Hilton-Davis Company, and the Vinol 107 is a polyvinyl alcohol used as a binding material.
  • the Acrawax C is a synthetic wax and is available from Glyco Inc., and the amide wax is Armid HT or Armoslip 18 from Armour Chemical Company.
  • the filler may be calcium carbonate supplied by Georgia Marble Company, or the filler may be Ansilex clay supplied by Engelhard Corporation.
  • Nopco NDW is a defoamer of the glycol group and is available from Diamond Shamrock Corp.
  • Niaproof 08 is a sodium 2- ethylhexyl sulfate used as a wetting agent and is available from Niacet Corp.
  • Tinopal PT is a fluorescent brightener available from Ciba-Geigy Corporation.
  • the titanium dioxide is a white pigment available from N. L. Industries (National Lead Corporation), and the zinc stearate is used as an anti-stick agent and is available from Witco Chemical Company.

Abstract

A thermal printing method and system uses a magnetic thermal transfer ribbon (10) to transfer images onto an adja­ cent medium (18) and near infra-red energy is used to transfer the images from the medium (18) onto thermal paper (26) or onto translucent paper (32) for producing multiple copies.

Description

THERMAL PRINTING METHOD AND SYSTEM
Technical Field
The present invention relates to thermal printing and to an improved system for making an original and at least one good record copy during a printing operation.
Background of the Invention
In the field of thermal printing, it is well- known that a significant limitation in the printing operation is the absence of copies during such printing operation. The early thermal printing systems used a thermal print element energized to heat specific and precise areas of a heat-sensitive paper or like record material and thereby produce readable characters on the single sheet of paper. In this respect, the single sheet of paper includes material which is reactive to the applied heat and is described as a self-contained system.
More recently, thermal printing systems have included two separate sheets of paper or like record material, wherein each sheet is coated with a heat- sensitive reactive material. The top or front sheet is usually a light weight tissue-type paper which is coated with a heat-sensitive material and the second sheet is preferably bond-type paper which is also coated with the heat-sensitive material. The two sheets are then mated or collated in a manner wherein the uncoated side of the tissue paper is in contact with the coating on the bond paper. The coated side of the tissue paper is adjacent and in close proximity to the thermal printing elements, or in certain applications, the elements may be in actual contact with the tissue paper. The thermal elements are actuated to provide specific and precise marking or imaging on the papers in the process which enables the obtaining of a master sheet plus a readable copy. Alternatively, the tissue paper could be coated on both the front and back sides so that the thermal printing elements are adjacent or in contact with the front coated side of the tissue paper and the back coating is in contact with the bond paper. In similar manner, the thermal elements are actuated to provide the specific and precise marking or imaging on the two papers so as to be in readable form. The tissue sheet and the bond sheet are arranged in manifold manner and the imaging is accomplished by transfer of the ink or like material in the coating of the tissue sheet onto the bond sheet when the thermal elements are actuated.
Summary of the Invention
It is an object of the present invention to provide a simple and low-cost thermal printing method and system which produces a master by transfer and at . least one copy by utilizing thermal paper or uncoated tissue paper.
Thus, according to the invention, there is provided a thermal printing method of forming multiple copy images including the step of heating a thermal transfer coating on a first substrate in selective manner for transferring coating material in the form of images onto a second substrate placed adjacent said first substrate, characterized in that said coating includes material absorbing near infra-red energy, and further characterized by the steps of placing a copy medium adjacent the second substrate, and applying near infra-red energy over the copy medium for heating the images on said second substrate and transferring the images to said copy medium. According to another aspect of the invention, there is provided a heat-sensitive copy system including a first medium having a coating thereon, a second medium adjacent the first medium, means for selectively heating part of the coating on said first medium for transferring coating material onto the second medium in the form of images, characterized in that said coating is chosen to include near infra-red absorbing material, and further characterized by a copy medium adjacent the second medium, and means for producing near infra-red radiation for heating the second medium and transferring the coating images therefrom onto the copy medium.
Brief Description of the Drawings
Embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. 1 is a diagrammatic view of the first step of the thermal copy system of the present invention.
Fig. 2 is a diagrammatic view of one method of practicing the multiple ply concept, and
Fig. 3 is a similar view of another method of practicing the concept.
Best Method for Carrying Out the Invention
Figs. 1 and 2 illustrate in diagrammatic form the concept of a first process embodiment of the present invention wherein a thermal transfer ribbon 10 comprises a substrate 12 and a thermal transfer coating 14. In a first step of the process, a thermal print head 16 provides heat for transferring portions of the coating 14 onto a record medium which comprises a substrate 20 having a coating 21 for receiving the coating material 14 in the form of images 22. As shown in Fig. 2, the second step involves the use of the record medium 18 and the application of heat from a near infra-red lamp 24 for creating or developing the image or images 22 onto a thermal paper 26 comprising a substrate 28 and a coating 30 for receiving the image or images 22 in one manner or process.
A second process embodiment of the invention is shown in Figs. 1 and 3 and utilizes the same first step as the first embodiment, namely the use of the record medium 18, followed by the second step of applying heat from the near infra-red lamp 24 for transferring the image or images 22 onto the back side of translucent paper 32 which comprises a substrate 34 for receiving an image or images as at 36 from the coating 21 on the substrate 20.
Near infra-red is defined as that portion of the electromagnetic spectrum between the wavelengths of 0.8 and 3 microns or is that invisible radiation with wavelengths in the range between 8,000 angstroms and 30,000 angstroms.
Example I Example I describes the materials for use with the method wherein the transfer coating 14 is applied to one side of the substrate 12.
Coating Composition The transfer coating formulation 14 for the substrate 12 essentially consists of a hydrocarbon or polyethylene resin, one or more waxes, and a magnetic oxide or any other infra-red absorbing pigment. A preferred coating composition is as follows: TABLE 1
The coating formulation 21 on the substrate 20 essentially consists of a dye, a phenolic resin, a wax, and a clay.
Range
It is to be noted that while blue dye has been reasonably satisfactory in providing an acceptable imaging of thermal paper systems, the black dye provides better environmental stability (resistance to fading) and is considered to be the preferred composition. The thermal transfer coating 14 is applied to the base sheet 12 in the creation of the thermal transfer ribbon 10, and the receiving sheet 18 includes the substrate 20 and the coating formulation 21 as set out in Table 2 above. The coating 14 is in the range of 1.36 to 2.27 Kgs. pounds dry weight per ream on sheet 12 and the coating 21 is in the range of 0.68 to 0.9 Kg dry weight per ream on sheet 20.
The concept of multiple copy imaging in the present invention utilizes a combination of two technologies. The first technology used in the first step (Fig. 1) of each of the first and the second process embodiments involves the creation of a thermal print or image on a substrate by means of a thermal transfer ribbon 10 containing the coating 14 that includes the near infra-red absorbing material. The second step or phase of the first process embodiment involves the passing of a sandwich consisting of the substrate carrying the thermal print or image produced in the first step and a thermally reactive material sheet, such as thermal paper 26, under the near infra¬ red lamp 24 to create an image in the thermal paper (Fig. 2). As an alternative to the thermal paper in the second step of the second process embodiment, a translucent paper 32 may be used and the sandwich is passed under the lamp 24 to transfer an image on the translucent paper which image is visible through the paper (Fig. 3).
The overall concept of the present invention relies on the characteristic of absorbency of the near infra-red in the transferred print which heats the thermal image and reactivates the top thermally sensitive material thereby creating a readable image through the translucent sheet, as in the case of the second process embodiment. The image 22 produced on the receiving substrate 20 (Fig. 1) requires the presence of near IR absorbing material which becomes hot when exposed to the near IR lamp 24. In the case of the thermal paper 26 used in the first process embodiment, the thermally reactive material combines with the hot dot or hot character to produce a clean, clear image on the paper (Fig. 2). In the case of the translucent sheet 32, which does not contain a coating, the image is created by a partial transfer of the thermally reactive material from the receiving sheet 18 onto the back side of the translucent sheet 32 to provide a readable image 36 through such sheet (Fig. 3).
The present invention provides a method for making multiple copies by means of thermal printing equipment wherein such method eliminates the thickness sensitivity of materials currently used for multiple copy printing. In the various experiments completed when using the process of the present invention, a readable copy of the image was produced when a 10.88 Kg coated sheet (60 cm by 92 cm) was employed as the thermal paper. The invention is practical and simple for use where a limited amount of space is available for the necessary hardware since the only device required in the housing enclosure of the thermal transfer printer will be the near IR lamp 24.
The various ingredients utilized in the thermal transfer coating 14 are further identified and are available from the noted sources. The Ceramid wax is a fatty acid derived amide wax available from Glyco Chemicals, Inc. and WB-17 is an oxidized, isocyanated hydrocarbon wax from Petrolite Corporation. AC-617 is a low molecular weight polyethylene available from Allied Chemical Corporation and Piccotex-75 is a hard, color stable, substituted styrene copolymer resin from Hercules, Inc. The iron oxide is available from BASF, the Soya Lecithin is a wetting agent, oil-like extract of soybean from Capricorn Chemical, and the Slip Aid is a 20% dispersion of polymeric or high melting point polyethylene wax in xylene from Daniel Products. The bisphenol (4,4 - isopropyli-denediphenol) , as a reactive material of the phenol group, is available from Dow Chemical Company. The black color forming dye of the fluoran group is Pergascript from Ciba- Geigy Corporation, or S205 from Yamada Chemical Company, or N-102 from Hilton-Davis Company, and the Vinol 107 is a polyvinyl alcohol used as a binding material. The Acrawax C is a synthetic wax and is available from Glyco Inc., and the amide wax is Armid HT or Armoslip 18 from Armour Chemical Company. The filler may be calcium carbonate supplied by Georgia Marble Company, or the filler may be Ansilex clay supplied by Engelhard Corporation. Nopco NDW is a defoamer of the glycol group and is available from Diamond Shamrock Corp., Niaproof 08 is a sodium 2- ethylhexyl sulfate used as a wetting agent and is available from Niacet Corp., and Tinopal PT is a fluorescent brightener available from Ciba-Geigy Corporation. The titanium dioxide is a white pigment available from N. L. Industries (National Lead Corporation), and the zinc stearate is used as an anti-stick agent and is available from Witco Chemical Company.

Claims

Claims :
1. A thermal printing method of forming multiple copy images including the step of heating a thermal transfer coating (14) on the first substrate (12) in selective manner for transferring coating material in the form of images (22) onto a second substrate (18) placed adjacent said first substrate (12), characterized in that said coating (14) includes material absorbing near infra-red energy, and further characterized by the steps of a copy medium (26, 32) adjacent the second substrate (18), and applying near infra-red energy over the copy medium (26, 32) for heating the images (22) on said second substrate (18) and transferring the images (22) to said copy medium (26, 32).
2. A method of claim 1, characterized in that said first substrate (12) with the thermal transfer coating (14) thereon is a transfer ribbon.
3. A method of claim 1, characterized in that the second substrate (18) includes a thermochromic coating (21) thereon.
4. A method according to either claim 1 or claim 2, characterized in that said copy medium (26) is a thermal paper, and said images are transferred to the thermal paper by heat generated in the image areas of said second substrate (18).
5. A method according to either claim 1 or claim 2, characterized in that said copy medium (32) is translucent paper and said images are transferred to the translucent paper by the transfer of coating material from said second substrate (18).
6. A heat sensitive copy system including a first medium (12) having a coating (14) thereon, a second medium (18) adjacent the first medium (12), means for selectively heating the coating (14) on said first medium (12) for transferring coating material onto the second medium (18) in the form of images, characterized in that said coating is chosen to include near infra-red absorbing material, and further characterized by a copy medium (26, 32) adjacent the second medium (18), and means (24) for producing near infra-red radiation for heating the second medium (18) and transferring the coating images therefrom onto the copy medium (26, 32).
7. A copy system according to claim 6, characterized in that the coating (14) on said first medium (12) includes a wax, a hydrocarbon resin, and a magnetic oxide mixed in a solution of mineral spirits.
8. A copy system according to claim 6, characterized in that the coating (14) on the first medium (12) includes an amide wax of about 15 to 25%, a synthetic wax of about 15 to 25%, a polyethylene resin of about 4 to 8% and a magnetic oxide of about 40 to 60%.
9. A copy system according to claim 6, characterized in that the coating (14) on the first medium (12) also includes a copolymer resin of about 3 to 7%, a wetting agent of about 1 to 2% and a dispersion of polymeric wax in xylene of about 1 to 2%.
10. A copy system according to claim 6, characterized in that the coating (21) on the second medium (18) includes a synthetic wax of about 6 to 10%, a filler of about 38 to 50%, a white pigment of about 2 to 4%, a chromogenic dye of about 5 to 7%, a polyvinyl alcohol of about 5 to 15%, a fluorescent brightener material of about 3 to 5%, and a color reactant of about 18 to 25%.
EP19880906541 1987-07-06 1988-06-28 Thermal printing method and system Withdrawn EP0324011A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US8754387A 1987-07-06 1987-07-06
US87543 1987-07-06

Publications (1)

Publication Number Publication Date
EP0324011A1 true EP0324011A1 (en) 1989-07-19

Family

ID=22205807

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880906541 Withdrawn EP0324011A1 (en) 1987-07-06 1988-06-28 Thermal printing method and system

Country Status (3)

Country Link
EP (1) EP0324011A1 (en)
JP (1) JPH02500099A (en)
WO (1) WO1989000109A2 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA535267A (en) * 1952-05-15 1957-01-01 Minnesota Mining And Manufacturing Company Physical-mixture heat-sensitive copying-paper
NL205707A (en) * 1955-03-28
US3706276A (en) * 1970-09-18 1972-12-19 Bell & Howell Co Thermal transfer sheet
JPS572794A (en) * 1980-06-10 1982-01-08 Tomoegawa Paper Co Ltd Support body for heatsensitive recording paper
US4533596A (en) * 1983-06-28 1985-08-06 Ncr Corporation Thermal magnetic transfer ribbon
JPS6287388A (en) * 1985-10-15 1987-04-21 Ricoh Co Ltd Thermal transfer medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8900109A2 *

Also Published As

Publication number Publication date
JPH02500099A (en) 1990-01-18
WO1989000109A3 (en) 1989-02-09
WO1989000109A2 (en) 1989-01-12

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