EP0109319B1 - Procédé et papier pour impression par magnétographie et documents imprimés sur un tel papier - Google Patents

Procédé et papier pour impression par magnétographie et documents imprimés sur un tel papier Download PDF

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Publication number
EP0109319B1
EP0109319B1 EP19830402062 EP83402062A EP0109319B1 EP 0109319 B1 EP0109319 B1 EP 0109319B1 EP 19830402062 EP19830402062 EP 19830402062 EP 83402062 A EP83402062 A EP 83402062A EP 0109319 B1 EP0109319 B1 EP 0109319B1
Authority
EP
European Patent Office
Prior art keywords
paper
relative humidity
sheet
ohms
surface resistivity
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.)
Expired
Application number
EP19830402062
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0109319A1 (fr
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/fr
Application granted granted Critical
Publication of EP0109319B1 publication Critical patent/EP0109319B1/fr
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 magnetic ink generally called “toner which reveals the recorded image.
  • the ink is transferred to the paper where it is fixed by heating.
  • magnetizable inks are used, fuses.
  • 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 particular 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 (RH) which can exceed 65%, in which a fusible pulverulent magnetizable ink is transferred onto a sheet of paper, distributed according to the configuration at reproduce 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 50% during the transfer is at least 10 12 ohm / square, and whose smoothness is at least 20 Bekk.
  • RH relative humidity
  • a sheet having a surface resistivity of at least 10 12 ohm / square at 50% RH is suitable for use at 75% RH (surface resistivity of the order of 10 10 ohm / square) or more (surface resistivity greater than 10 10 ohm / square at 75% RH).
  • the invention also relates to a sheet of paper for printing by magnetography in ambient atmospheric conditions of relative humidity which can exceed 75%, characterized in that it has a surface resistivity of at least 10 12 ohm / square. measured with the Keithley device after exposure to 20 ° C in a 30% relative humidity atmosphere for one hour, then to 23 ° C in a 50% relative humidity atmosphere for at least 10 hours, and that it has a smoothness of at least 20 Bekk.
  • a sheet of paper having a surface resistivity of at least 10 12 ohm / square at 50% RH and at least 10 10 ohm will be used. / square at 75% RH.
  • 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 pigment in a non-hydrophilic binder on its face which is to receive the impression.
  • an inorganic pigment advantageously consists mainly of powdered calcium carbonate with an average particle diameter of the order of ⁇ m and of which approximately 80% of the particles have a diameter of less than approximately 2 ⁇ m.
  • the binder advantageously consists at least in part of a substance from the group relating to acrylate and styrene copolymers, 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 lower than 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 resistance mechanical 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 apparatus with the electrodes suitable for the measurements in "ohm / square",
  • 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.
  • a paper pulp is prepared by introducing the materials constituting the pulp suspension upstream of the paper machine:
  • This preparation is deposited on the sheet at a rate of approximately 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 1.
  • 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 1 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 2 is carried out on the side to be printed.
  • a pulp is produced by introducing the following materials upstream into the paper machine:
  • cationic retention agent cationized starch, such as that sold under the trade name Cato by the company known as ROQUETTE.
  • 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 3.10 12 ohm / square.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Paper (AREA)
  • Hard Magnetic Materials (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Credit Cards Or The Like (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Duplication Or Marking (AREA)
EP19830402062 1982-11-04 1983-10-24 Procédé et papier pour impression par magnétographie et documents imprimés sur un tel papier Expired EP0109319B1 (fr)

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
FR8218471 1982-11-04
FR8218471A FR2535752A1 (fr) 1982-11-04 1982-11-04 Procede et papier pour impression par magnetographie, et documents imprimes sur un tel papier

Publications (2)

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

Family

ID=9278888

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830402062 Expired EP0109319B1 (fr) 1982-11-04 1983-10-24 Procédé et papier pour impression par magnétographie et documents imprimés sur un tel papier

Country Status (10)

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

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 (1)

* 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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4058648A (en) * 1975-04-03 1977-11-15 Louden William G Dense paper
GB1510281A (en) * 1976-02-05 1978-05-10 Mita Industrial Co Ltd Electrophotographic or electrostatic printing process and apparatus
JPS5339752A (en) * 1976-09-24 1978-04-11 Mita Industrial Co Ltd Transfer sheet and method of preparing same
US4364661A (en) * 1980-05-13 1982-12-21 Savin Corporation Process and apparatus for transferring developed electrostatic images to a carrier sheet, improved carrier sheet for use in the process and method of making the same
US4500607A (en) * 1982-07-28 1985-02-19 William Gordon Louden Flat paper and method of manufacturing involving controlled drying conditions

Patent Citations (1)

* 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

Also Published As

Publication number Publication date
DE3369406D1 (en) 1987-02-26
FI75062B (fi) 1987-12-31
CA1205687A (en) 1986-06-10
FR2535752B1 (fi) 1985-03-22
JPS59111671A (ja) 1984-06-27
EP0109319A1 (fr) 1984-05-23
IT1169661B (it) 1987-06-03
FR2535752A1 (fr) 1984-05-11
US4689282A (en) 1987-08-25
IT8323582A0 (it) 1983-11-03
FI75062C (fi) 1988-04-11
FI834000A (fi) 1984-05-05
FI834000A0 (fi) 1983-11-01
ATE25155T1 (de) 1987-02-15
BE898137A (fr) 1984-05-03

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