EP0109319A1 - Magnetisches Druckverfahren und Kopieblatt für Vorlagen - Google Patents

Magnetisches Druckverfahren und Kopieblatt für Vorlagen Download PDF

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Publication number
EP0109319A1
EP0109319A1 EP19830402062 EP83402062A EP0109319A1 EP 0109319 A1 EP0109319 A1 EP 0109319A1 EP 19830402062 EP19830402062 EP 19830402062 EP 83402062 A EP83402062 A EP 83402062A EP 0109319 A1 EP0109319 A1 EP 0109319A1
Authority
EP
European Patent Office
Prior art keywords
paper
sheet
relative humidity
magnetography
printing
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
EP19830402062
Other languages
English (en)
French (fr)
Other versions
EP0109319B1 (de
Inventor
Georges Gidon
Claude Richard
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.)
Aussedat Rey SA
Original Assignee
Aussedat Rey SA
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 Aussedat Rey SA filed Critical Aussedat Rey SA
Priority to AT83402062T priority Critical patent/ATE25155T1/de
Publication of EP0109319A1 publication Critical patent/EP0109319A1/de
Application granted granted Critical
Publication of EP0109319B1 publication Critical patent/EP0109319B1/de
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/14—Transferring a pattern to a second base
    • G03G13/16—Transferring a pattern to a second base of a toner pattern, e.g. a powder pattern
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/3188—Next to cellulosic
    • Y10T428/31895—Paper or wood
    • Y10T428/31906—Ester, halide or nitrile of addition polymer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31971—Of carbohydrate
    • Y10T428/31993—Of paper
    • Y10T428/31996—Next to layer of metal salt [e.g., plasterboard, etc.]

Definitions

  • the present invention relates to magnetography, that is to say printing using a magnetic drum on which a magnetic image of the impression to be produced is formed, then particles are adhered to this magnetic image.
  • solid magnet ink generally called “toner” which reveals the recorded image.
  • Printing by magnetography is more particularly advantageous for printing at high speed documents originating from computers.
  • the print When the paper has been exposed to a relative air humidity above 50%, the print is very pale, that is, its optical density is low.
  • magnetographic printing requires a low humidity of paper and a maintenance of this humidity by a sealed packaging protecting it from ambient humidity until the moment of printing.
  • the printer must be able to operate in unconditioned atmospheres.
  • the object of the invention is to overcome the drawbacks of magnetography in highly humid atmospheres and to make it possible to obtain correct impressions without special precautions, even at high ambient humidities.
  • the subject of the invention is a process for printing by magnetography under ambient atmospheric conditions of relative humidity which can exceed 65%, in which a fusible pulverulent magnetizable ink is transferred onto a sheet of paper, distributed according to the configuration to be reproduced on a temporary magnetizable support, then the ink is fixed by fusion on the sheet of paper, characterized in that a sheet of paper is used whose surface resistivity in the conditions of relative humidity of the transfer is at least 10 ohms square , and whose smoothness is at least 20 Bekk.
  • a subject of the invention is also a sheet of paper for printing by magnetography under ambient atmospheric conditions of relative humidity which may exceed 75%, characterized in that that it has a surface resistivity of at least 10 10 ohms square measured with the Keithley device after exposure to 20 ° C in an atmosphere of relative humidity of 30% for one hour, then to 23 ° C in an environment of relative humidity of 50% for at least 10 hours, and in that it exhibits a smoothness of at least 20 Bekk.
  • a sheet of paper according to the invention contains practically no fluorescent whitening agent or electrolyte.
  • a sheet of paper for magnetography has a surface layer of mineral pigments in a non-hydrophilic binder on its face which is to receive the impression.
  • Such an inorganic pigment advantageously consists mainly of powdered calcium carbonate with an average particle diameter of the order of a micron and of which approximately 80% of the particles have a diameter of less than approximately 2 microns.
  • the binder is advantageously constituted at least in part by a substance from the group relating to acrylate and styrene copolymers, polyvinyl alcohol, urea-formaldehyde resins, without plasticizer or solvent.
  • a sheet of paper having a porosity of the order of 200 to 300, measured according to the Bendtsen method and a pH below 7, is used.
  • the refining of the pulp should be as low as possible, taking into account the mechanical strength of the paper that is desired.
  • the rate of mineral fillers should be as high as possible within the limit of the mechanical strength of the desired paper.
  • optical density of printing produced on a magnetographic printer depends on the surface electrical resistivity at the time of printing, this factor being essential, but also on the surface smoothness which must be greater than 20 Bekk, this factor however being of second order.
  • the surface resistivity values indicated here are those measured with the Keithley device with the appropriate electrodes for measurements in "square ohms”.
  • any process which makes it possible to reduce the hygroscopicity of paper that is to say the quantity of water which it is capable of fixing when it is subjected to a given climate, will be favorable to magnetographic printing.
  • a lower water content in fact leads to an increase in resistivity and it has been found that the base logarithm of the surface resistivity is a decreasing linear function of logarithm of the water content.
  • the invention also relates to documents printed by magnetography on papers according to the invention.
  • This preparation is placed on the sheet to about 16 g / m 2 , or 8 g / m 2 on each side.
  • the sheet is subjected to calendering to give it a smoothness greater than 20 Bekk.
  • a dough is prepared with the same materials as in Example I.
  • the sheet of paper thus produced is subjected to a surface coating by means of a trailing blade coater which is more efficient than the surfacing press of Example I and allows coating on one side with a more uniform deposit.
  • the preparation is extended to 1000 kg by adding water and any introduction of bleaching agents or other optical agents is avoided.
  • a deposit of the order of 12 to 15 g / m is carried out on the side to be printed.
  • a coating is carried out with a starch preparation based on starch degraded by enzymation at a concentration of 10%, free of any fluorescent dye and any electrolyte.
  • the porosity of the finished paper which must be between 200 and 500, is measured, measured according to the Bendtsen method.
  • This porosity is the index of a weak refining, according to the known law linking refining to porosity, the latter being a decreasing function of refining.
  • this paper produced in an acid medium has a pH of less than 7 measured by the method of "determining the pH of the aqueous extracts of the papers" as described in standard AFNOR Q 03 005 or standard ISO / DIS 6588.
  • a paper according to Example III must have a surface resistivity greater than 3 . 1 0 12

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Hard Magnetic Materials (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Duplication Or Marking (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Credit Cards Or The Like (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Decoration By Transfer Pictures (AREA)
EP19830402062 1982-11-04 1983-10-24 Magnetisches Druckverfahren und Kopieblatt für Vorlagen Expired EP0109319B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83402062T ATE25155T1 (de) 1982-11-04 1983-10-24 Magnetisches druckverfahren und kopieblatt fuer vorlagen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8218471A FR2535752A1 (fr) 1982-11-04 1982-11-04 Procede et papier pour impression par magnetographie, et documents imprimes sur un tel papier
FR8218471 1982-11-04

Publications (2)

Publication Number Publication Date
EP0109319A1 true EP0109319A1 (de) 1984-05-23
EP0109319B1 EP0109319B1 (de) 1987-01-21

Family

ID=9278888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830402062 Expired EP0109319B1 (de) 1982-11-04 1983-10-24 Magnetisches Druckverfahren und Kopieblatt für Vorlagen

Country Status (10)

Country Link
US (1) US4689282A (de)
EP (1) EP0109319B1 (de)
JP (1) JPS59111671A (de)
AT (1) ATE25155T1 (de)
BE (1) BE898137A (de)
CA (1) CA1205687A (de)
DE (1) DE3369406D1 (de)
FI (1) FI75062C (de)
FR (1) FR2535752A1 (de)
IT (1) IT1169661B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2588583B1 (fr) * 1985-10-14 1988-11-04 Aussedat Rey Papier de resistivite superficielle elevee et son utilisation dans le domaine de l'impression par magnetographie
US4891240A (en) * 1988-09-06 1990-01-02 Storage Technology Corporation MICR character coating system
FI109415B (fi) 2000-01-28 2002-07-31 M Real Oyj Menetelmä painotuotteiden valmistamiseksi
US11982236B2 (en) 2017-12-22 2024-05-14 General Electric Company Titanium alloy compressor case

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340568A1 (fr) * 1976-02-05 1977-09-02 Mita Industrial Co Ltd Procede et appareil d'impression electrophotographique ou electrostatique
FR2482737A1 (fr) * 1980-05-13 1981-11-20 Savin Corp Feuille de support d'image electrostatique, procede et appareil de fabrication d'une telle feuille, et procede et appareil de formation d'images par electrophotographie
US4328265A (en) * 1976-09-24 1982-05-04 Mita Industrial Company Limited Process for preparation of a transfer sheet for electrostatic photography or printing

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1401145A (en) * 1972-10-18 1975-07-16 Pluss Stauffer Ag Pigmetned paper
US4058648A (en) * 1975-04-03 1977-11-15 Louden William G Dense paper
US4500607A (en) * 1982-07-28 1985-02-19 William Gordon Louden Flat paper and method of manufacturing involving controlled drying conditions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340568A1 (fr) * 1976-02-05 1977-09-02 Mita Industrial Co Ltd Procede et appareil d'impression electrophotographique ou electrostatique
US4328265A (en) * 1976-09-24 1982-05-04 Mita Industrial Company Limited Process for preparation of a transfer sheet for electrostatic photography or printing
FR2482737A1 (fr) * 1980-05-13 1981-11-20 Savin Corp Feuille de support d'image electrostatique, procede et appareil de fabrication d'une telle feuille, et procede et appareil de formation d'images par electrophotographie

Also Published As

Publication number Publication date
IT8323582A0 (it) 1983-11-03
FI75062B (fi) 1987-12-31
FR2535752B1 (de) 1985-03-22
FI834000A (fi) 1984-05-05
BE898137A (fr) 1984-05-03
DE3369406D1 (en) 1987-02-26
CA1205687A (en) 1986-06-10
FI834000A0 (fi) 1983-11-01
FR2535752A1 (fr) 1984-05-11
EP0109319B1 (de) 1987-01-21
IT1169661B (it) 1987-06-03
ATE25155T1 (de) 1987-02-15
US4689282A (en) 1987-08-25
FI75062C (fi) 1988-04-11
JPS59111671A (ja) 1984-06-27

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