EP0432506A2 - Feuille pour le transfert thermique pour former des images directement sur un cylindre d'impression - Google Patents

Feuille pour le transfert thermique pour former des images directement sur un cylindre d'impression Download PDF

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Publication number
EP0432506A2
EP0432506A2 EP90121868A EP90121868A EP0432506A2 EP 0432506 A2 EP0432506 A2 EP 0432506A2 EP 90121868 A EP90121868 A EP 90121868A EP 90121868 A EP90121868 A EP 90121868A EP 0432506 A2 EP0432506 A2 EP 0432506A2
Authority
EP
European Patent Office
Prior art keywords
layer
thermal transfer
substance
transfer film
printing form
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
EP90121868A
Other languages
German (de)
English (en)
Other versions
EP0432506B1 (fr
EP0432506A3 (en
Inventor
Josef Dr. Schneider
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen 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 MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0432506A2 publication Critical patent/EP0432506A2/fr
Publication of EP0432506A3 publication Critical patent/EP0432506A3/de
Application granted granted Critical
Publication of EP0432506B1 publication Critical patent/EP0432506B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor

Definitions

  • the invention relates to a thermal transfer film for the direct imaging of a printing form cylinder by means of a pixel transfer unit working with selective heat transfer according to the preamble of patent claim 1.
  • the invention has for its object to develop a generic thermal transfer film so that this distance and pressure fluctuations between thermal print head and printing form cylinder surface compensates.
  • This object is achieved in that a layer of foamable material is arranged between the film substrate and the fusible substance, the response temperature for the foaming process is greater than the melting temperature of the substance.
  • a thermal transfer film is drawn between a printing form cylinder 1 and an image transfer unit 3 equipped with a plurality of individually activatable heating elements 2 by means of a transport device consisting of two coils 5, 6.
  • a layer 8 of material that can be foamed under the influence of heat, the response temperature of which for the foaming process is greater than the melting temperature of the substance 7.
  • a separating layer 10 is additionally arranged between a layer 8 'of foamable material and a layer 7 of a fusible substance 7', which promotes the detachment of the molten substance 7 '.
  • the carrier layer 9 is made of a material which is dimensionally stable in the longitudinal and transverse directions and is only slightly compressible in thickness and has good thermal conductivity.
  • the layer 8 made of foamable material consists for example of a thermoplastic or a mixture containing a thermoplastic, and a blowing agent.
  • the blowing agent concentration is 0.3-1.5%, preferably 0.6-1%.
  • the mass is spread onto the substrate 9, e.g. Polyethylene glycol terephthalic acid ester film, applied as layer 8 of 0.002-0.01 mm, preferably 0.002-0.004 mm, in thickness.
  • a layer 8 with a defined moisture content e.g. 200 g of cellulose (molecular weight 1100) are stirred into 1 l of water with the addition of 0.01% carboxymethyl cellulose (degree of substitution 0.5).
  • the mixture is brought to pH 6 with NAOH and mixed in a ball mill for 3 hours.
  • the mixture as layer 8 is coated onto a polyester film hydrophilized by corona discharge as a substrate 9 and doctored off. After predrying with hot air to about 60% dye content, the film coated in this way is brought to 3-4% residual moisture via press and drying rollers and subsequent hot air treatment. The residual moisture is then set to 8% in a spray system.
  • the finished layer 8 has a thickness of 6 microns.
  • An oleophilic layer 8 of dispersion as described above can then be applied in a prescribed manner.
  • the separating layer 10 has good non-stick properties on the side facing the coating 7 in order to facilitate the detachment of molten substance parts.
  • the meltable substance has oleophilic properties.
  • the printing form cylinder 1 has a surface with a continuously hydrophilic property in the unimaged state.
  • Plasma or flame sprayed ceramic or metallic surfaces such as chrome, copper, etc., which, owing to its surface roughness, exert a greater adhesive force on the molten substance 7, 7 'than the layers 8 or 10.
  • the pixel transmission unit 3 receives data for an imaging of the printing form cylinder 1 from a memory (not shown). According to this data, the heating elements 2 opposite each other on the back of the thermal transfer film 4 are heated by the supply of energy at the level of the image-guiding parts of the printing form cylinder 1. The heat given off by the head of the heating elements 2 successively penetrates the substrate 9 or 9 ', the layer 8 or 8', the separating layer 10 which may be present and melts a narrowly defined area out of the substance 7, 7 '.
  • part 7 a of the substance 7 is accepted by the cold surface of the printing form cylinder 1 and solidifies there.
  • the substance parts 7 a mark the color-guiding image areas on the surface of the printing form cylinder 1 due to their oleophilic property during later printing.
  • the temperature continues to rise until the response temperature of the layer 8, 8' is reached.
  • the layer 8, 8 'foams interrupts the further supply of heat due to its increased strength, which is essentially due to air bubbles formed during foaming with poor thermal conductivity, and at the same time presses the molten substance 7, 7' against the surface of the printing form cylinder 1, where it sticks and freezes.
  • gas or water vapor bubbles form, the effect of which is analogous to that of the foamed layer 7.
  • the water vapor bubble is re-formed each time it cools down, the water condenses out, so that there is an additional advantage here shows that the rewound film has no bumps and is easier to handle.
  • the sharpness of the contour of the image areas marked on the surface of the printing form cylinder 1 is not the sharpness of the edge of the foaming area, but rather the sharpness of the edge of the melted area in the substance 7, 7 '.
  • the foamable intermediate layer 8 can also compensate for larger dimensional deviations of all components involved in the range up to approximately one millimeter in an advantageous manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP90121868A 1989-12-14 1990-11-15 Feuille pour le transfert thermique pour former des images directement sur un cylindre d'impression Expired - Lifetime EP0432506B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3941303 1989-12-14
DE3941303A DE3941303C1 (fr) 1989-12-14 1989-12-14

Publications (3)

Publication Number Publication Date
EP0432506A2 true EP0432506A2 (fr) 1991-06-19
EP0432506A3 EP0432506A3 (en) 1991-10-16
EP0432506B1 EP0432506B1 (fr) 1994-09-21

Family

ID=6395458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90121868A Expired - Lifetime EP0432506B1 (fr) 1989-12-14 1990-11-15 Feuille pour le transfert thermique pour former des images directement sur un cylindre d'impression

Country Status (5)

Country Link
US (1) US5382964A (fr)
EP (1) EP0432506B1 (fr)
JP (1) JP2999243B2 (fr)
CA (1) CA2027332C (fr)
DE (2) DE3941303C1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284788A (en) * 1993-12-16 1995-06-21 Roland Man Druckmasch Improvements in or relating to relief printing
US6677010B1 (en) 1999-08-07 2004-01-13 Man Roland Druckmaschinen Ag Thermal transfer sheet for the laser-induced coating of a printing form cylinder
US20110201837A1 (en) * 2008-11-07 2011-08-18 Evonik Oxeno Gmbh Method for producing 6-chlorodibenzo[d,f] [1,3,2]dioxaphosphepin

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5881645A (en) * 1992-09-10 1999-03-16 Lenney; John Richard Method of thermally spraying a lithographic substrate with a particulate material
US5967047A (en) * 1993-12-27 1999-10-19 Agfa-Gevaert Ag Thermal process for applying hydrophilic layers to hydrophobic substrates for offset printing plates
US5816161A (en) * 1994-07-22 1998-10-06 Man Roland Druckmaschinen Ag Erasable printing plate having a smooth pore free metallic surface
US5819661A (en) * 1995-01-23 1998-10-13 Presstek, Inc. Method and apparatus for laser imaging of lithographic printing members by thermal non-ablative transfer
GB2334727A (en) 1998-02-28 1999-09-01 Horsell Graphic Ind Ltd Planographic printing member
JP3422754B2 (ja) * 2000-05-31 2003-06-30 三菱重工業株式会社 印刷用版材の作製方法、再生方法及び印刷機
DE10054284B4 (de) * 2000-11-02 2010-04-08 Manroland Ag Verfahren zur Behandlung einer löschbaren lithographischen Druckform
DE10063819B4 (de) * 2000-12-21 2006-02-02 Man Roland Druckmaschinen Ag Maskenerstellung zur Herstellung einer Druckform

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248178C2 (de) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt Bildmäßige Beschichtung von Druckformen für den Flachdruck
US4565737A (en) * 1983-05-02 1986-01-21 Canon Kabushiki Kaisha Heat-sensitive transfer material
JPS6141547A (ja) * 1984-08-02 1986-02-27 Toppan Printing Co Ltd 印刷版の製造方法
JPS61110593A (ja) * 1984-11-02 1986-05-28 Canon Inc 感熱転写材
JPS61162392A (ja) * 1985-01-11 1986-07-23 Alps Electric Co Ltd 感熱転写媒体
JPS63751A (ja) * 1986-06-20 1988-01-05 Fujitsu Ltd プリフエツチ制御方式
JPS6360751A (ja) * 1986-09-01 1988-03-16 Matsushita Electric Ind Co Ltd 印刷用マスタ−及びその製造方法
JPS63214481A (ja) * 1987-03-02 1988-09-07 Canon Inc 感熱転写材
US4897310A (en) * 1987-12-15 1990-01-30 Siemens Aktiengesellschaft Inking ribbon for transferring color under the influence of heat
DE3834270A1 (de) * 1988-10-08 1990-04-12 Roland Man Druckmasch Verfahren zur herstellung von druckformen
US5191834A (en) * 1988-10-14 1993-03-09 Man Roland Druckmaschinen Ag Printing system with printing form having a ferro-electric layer
US5072671A (en) * 1988-11-09 1991-12-17 Man Roland Druckmaschinen Ag System and method to apply a printing image on a printing machine cylinder in accordance with electronically furnished image information

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2284788A (en) * 1993-12-16 1995-06-21 Roland Man Druckmasch Improvements in or relating to relief printing
GB2284788B (en) * 1993-12-16 1997-07-16 Roland Man Druckmasch Improvements in or relating to relief printing
US6677010B1 (en) 1999-08-07 2004-01-13 Man Roland Druckmaschinen Ag Thermal transfer sheet for the laser-induced coating of a printing form cylinder
US20110201837A1 (en) * 2008-11-07 2011-08-18 Evonik Oxeno Gmbh Method for producing 6-chlorodibenzo[d,f] [1,3,2]dioxaphosphepin
US8609878B2 (en) * 2008-11-07 2013-12-17 Evonik Oxeno Gmbh Method for producing 6-chlorodibenzo[D,F] [1 3,2]Dioxaphosphepin

Also Published As

Publication number Publication date
DE3941303C1 (fr) 1990-12-13
JPH03189151A (ja) 1991-08-19
CA2027332C (fr) 1996-10-15
CA2027332A1 (fr) 1991-06-15
EP0432506B1 (fr) 1994-09-21
JP2999243B2 (ja) 2000-01-17
EP0432506A3 (en) 1991-10-16
DE59007252D1 (de) 1994-10-27
US5382964A (en) 1995-01-17

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