EP0081887A1 - Method for the application of a protective light-transmitting coating on a toner image formed on a substrate - Google Patents

Method for the application of a protective light-transmitting coating on a toner image formed on a substrate Download PDF

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Publication number
EP0081887A1
EP0081887A1 EP82201586A EP82201586A EP0081887A1 EP 0081887 A1 EP0081887 A1 EP 0081887A1 EP 82201586 A EP82201586 A EP 82201586A EP 82201586 A EP82201586 A EP 82201586A EP 0081887 A1 EP0081887 A1 EP 0081887A1
Authority
EP
European Patent Office
Prior art keywords
toner
substrate
image
protective
toner image
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
EP82201586A
Other languages
German (de)
French (fr)
Other versions
EP0081887B1 (en
Inventor
Milan Percic
Edo Reitsma
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.)
Coulter Stork Patents BV
Original Assignee
Coulter Stork Patents BV
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 Coulter Stork Patents BV filed Critical Coulter Stork Patents BV
Priority to AT82201586T priority Critical patent/ATE12844T1/en
Publication of EP0081887A1 publication Critical patent/EP0081887A1/en
Application granted granted Critical
Publication of EP0081887B1 publication Critical patent/EP0081887B1/en
Expired legal-status Critical Current

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    • 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
    • G03G13/01—Electrographic processes using a charge pattern for multicoloured copies
    • G03G13/013—Electrographic processes using a charge pattern for multicoloured copies characterised by the developing step, e.g. the properties of the colour developers
    • G03G13/0139—Electrographic processes using a charge pattern for multicoloured copies characterised by the developing step, e.g. the properties of the colour developers developing using a step for clear toner deposition, e.g. for regulating gloss or supplying protective coatings
    • 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
    • G03G13/20—Fixing, e.g. by using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon

Definitions

  • the invention relates to a method for the application of a protective light-transmitting coating on a toner image formed on a substrate which is obtained by charging up a photoconductive substrate, image-wise discharging this by exposure and its development by means of pigmented toner and the subsequent transfer of the toner image obtained to a receptor substrate.
  • the present invention provides a solution for this problem.
  • a second toner image is formed with a protective light-transmitting toner, this second toner image being registered with the first image on the receptor substrate, and subsequently fixed.
  • protective toner is applied exclusively to the substrate where pigmented toner is present so that the surface portions of the substrate not provided with an image retain their original surface structure.
  • the invention can be used especially where, using known electrophotographic techniques a proof print is formed from a colour print, using a number of colour separations obtained from an original.
  • the operation of applying the protective toner can be undertaken precisely as many times as there are colour separations, using on each occasion another colour separation, but it is also possible to form the protective toner image starting with an exposure of the photoconductive coating via all the colour separations employed during image formation and brought into registration therewith.
  • Fig. 1a illustrates schematically a substrate 1 which is image-wise covered with toner of different colour; toner of the first colour is indicated by the toner sections 2 shown as solidly filled, and toner of the second colour is indicated by toner sections 3 which are shown thatched.
  • the toner images are obtained in the conventional manner starting from respectively the light-transmitting colour separations 4 and 5; toner image 2 is obtained after exposure via colour separation 4 and subsequent development with toner 2, and toner image 3 after exposure via colour separation 5 and development with toner 3. Naturally there are also locations where toner images of the two different colours are there placed one on top of the other, and locations where/is no toner present at all.
  • the image obtained in this manner is covered with a transparent, non-pigmented protective toner only where pigmented toner is present.
  • a transparent, non-pigmented protective toner only where pigmented toner is present.
  • Fig. lf indicates that it is also possible to apply the protective toner in a single operation. Then a toner image 9 is formed using all the colour separations 4, 5 employed during the formation of the respective partial images, these being registered one above the other, and via which the photoconductive covering 10 to be employed is exposed. The toner image obtained after exposure and development with protective toner as shown in fig. lf is then registered on the image 2, 3 which is to be protected. Fig. 1g shows the result finally obtained.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Fixing For Electrophotography (AREA)
  • Developing For Electrophotography (AREA)

Abstract

Method for forming a protective transparant coating on a toner image formed electrophotographically by depositing a transparant protective toner electrophotographically and in registration on said toner image, using the same original.

Description

  • The invention relates to a method for the application of a protective light-transmitting coating on a toner image formed on a substrate which is obtained by charging up a photoconductive substrate, image-wise discharging this by exposure and its development by means of pigmented toner and the subsequent transfer of the toner image obtained to a receptor substrate.
  • The formation of images by means of electro-photographic techniques, utilizing one or more pigmented toners adhering to a substrate, e.g. a sheet of paper, forms part of state of the art. As compared with known printing techniques, where use is made of a black or coloured ink, this electrophotographic technique possesses many advantages, but also the disadvantage that different types of toner which have nevertheless to be employed for certain reasons adhere more poorly to the recipient surface than the conventional ink. For this reason a known method is that after the formation of an image with such toners, the entire substrate is covered with a thin layer consisting of a suitable protective substance which is for example polymerisable or dissolved in a volatile solvent.
  • This method, where the entire surface of the substrate, i.e. also the sections not carrying any toner, is covered suffers however from the disadvantage that the substrate obtains a surface structure other than that normally obtained during printing. The surface appears unnatural to the observer. Especially if electrophotographic techniques are employed for the formation of a proof print, this is a major disadvantage.
  • The present invention provides a solution for this problem. In accordance with the invention, from the same orgininal, on the photoconductive substrate a second toner image is formed with a protective light-transmitting toner, this second toner image being registered with the first image on the receptor substrate, and subsequently fixed.
  • Thus with the method in accordance with the invention protective toner is applied exclusively to the substrate where pigmented toner is present so that the surface portions of the substrate not provided with an image retain their original surface structure. The image ultimately obtained, protected by a layer of protective toner, as a result appears to be much more "natural".
  • The invention can be used especially where, using known electrophotographic techniques a proof print is formed from a colour print, using a number of colour separations obtained from an original. Here the operation of applying the protective toner can be undertaken precisely as many times as there are colour separations, using on each occasion another colour separation, but it is also possible to form the protective toner image starting with an exposure of the photoconductive coating via all the colour separations employed during image formation and brought into registration therewith.
  • The invention will now be explained with the aid of the drawing which illustrates the various stages which lead to the procurement of the ultimate protective coating.
  • Fig. 1a illustrates schematically a substrate 1 which is image-wise covered with toner of different colour; toner of the first colour is indicated by the toner sections 2 shown as solidly filled, and toner of the second colour is indicated by toner sections 3 which are shown thatched.
  • The toner images are obtained in the conventional manner starting from respectively the light-transmitting colour separations 4 and 5; toner image 2 is obtained after exposure via colour separation 4 and subsequent development with toner 2, and toner image 3 after exposure via colour separation 5 and development with toner 3. Naturally there are also locations where toner images of the two different colours are there placed one on top of the other, and locations where/is no toner present at all.
  • In accordance with the present invention the image obtained in this manner is covered with a transparent, non-pigmented protective toner only where pigmented toner is present. To achieve this two different methods can be employed:
    • Fig. lb illustrates how, on a suitable photoconductive coating 6, a toner image is formed from the desired protective toner 7, utilising the first colour separation 4 and this toner image is registered precisely on the image to be protected. Fig. lc shows the result obtained.
  • At that point where solely toner 3 of the second colour is present no protective toner is applied. These locations are covered in the next stage: once again an image is formed from protective toner 8, on this occasion utilising the second colour separation 5 (see fig. ld) and the image obtained in this way is once again registered precisely on the substrate already partially covered with protective toner. The situation which then prevails is shown schematically in fig. le. All pigmented toner is now covered by protective toner, the latter fusing as a result of heating on the surface of the substrate.
  • Fig. lf indicates that it is also possible to apply the protective toner in a single operation. Then a toner image 9 is formed using all the colour separations 4, 5 employed during the formation of the respective partial images, these being registered one above the other, and via which the photoconductive covering 10 to be employed is exposed. The toner image obtained after exposure and development with protective toner as shown in fig. lf is then registered on the image 2, 3 which is to be protected. Fig. 1g shows the result finally obtained.
  • It is observed that the reference numerals in the claims are not intended to restrict the scope thereof, but are only denoted for clarification.

Claims (4)

1. Method for application of a protective light-transmitting-coating on a toner image formed on a substrate which is obtained by charging up a photoconductive substrate, discharging this image-wise by exposure, and developing it with the aid of pigmented toner and the subsequent transfer of the toner image obtained to a receptor substrate, characterised in that a second toner image is formed from the same original on the photoconductive substrate with a protective light-transmitting toner, this second toner image being brought into registration with the first image on the receptor substrate and subsequently fixed.
2. Method as in claim 1, as used in the case in which the image transferred to the substrate is obtained using a number of colour separations, by means of which a number of toner images of different colour and in precise registrations are formed consecutively, characterised in that the cycle of applying a protective light-transmitting coating is repeated as many times as there are colour separations, on each occasion with a different colour separation.
3. Method as in claim 1, as used in the case in which the image transferred to the substrate is obtained using a number of colour separations, by means of which a number of registered toner images of different colour are formed consecutively, characterised in that the second protective toner image is formed starting with an exposure of the photoconductive coating via all the colour separations employed in the preceding stages and being into registration with each other.
4. Method as in claims 1 - 3, characterised in that the protective toner layer is colourless.
EP82201586A 1981-12-16 1982-12-10 Method for the application of a protective light-transmitting coating on a toner image formed on a substrate Expired EP0081887B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82201586T ATE12844T1 (en) 1981-12-16 1982-12-10 PROCESS FOR APPLYING A LIGHT-TRANSMITTING PROTECTIVE COATING TO A TONER IMAGE FORMED ON A SUBSTRATE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8105674 1981-12-16
NL8105674A NL8105674A (en) 1981-12-16 1981-12-16 METHOD FOR APPLYING A PROTECTIVE LIGHT-TRANSPARENT COATING TO A TONER IMAGE CONTAINED ON A SUBSTRATE

Publications (2)

Publication Number Publication Date
EP0081887A1 true EP0081887A1 (en) 1983-06-22
EP0081887B1 EP0081887B1 (en) 1985-04-17

Family

ID=19838560

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82201586A Expired EP0081887B1 (en) 1981-12-16 1982-12-10 Method for the application of a protective light-transmitting coating on a toner image formed on a substrate

Country Status (6)

Country Link
EP (1) EP0081887B1 (en)
JP (1) JPS58114067A (en)
AT (1) ATE12844T1 (en)
AU (1) AU552848B2 (en)
DE (1) DE3263176D1 (en)
NL (1) NL8105674A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629921A1 (en) * 1993-06-18 1994-12-21 Xeikon Nv Electrostatographic printing including the use of colourless toner
EP0725317A1 (en) 1995-01-30 1996-08-07 Agfa-Gevaert N.V. Polymer suspension method for producing toner particles
EP0810482A1 (en) * 1996-05-21 1997-12-03 Agfa-Gevaert N.V. A toner image resistant to scratching
EP0839670A1 (en) * 1996-11-01 1998-05-06 The Stationery Office Limited Security coating of documents
EP1283449A3 (en) * 2001-08-08 2004-03-17 Heidelberger Druckmaschinen Aktiengesellschaft Method for reducing rub-off from a toner image using a phase change composition

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU588640B2 (en) * 1985-10-24 1989-09-21 Stork Colorproofing B.V. Method of image fixing in colour electrostatography
EP0486235B1 (en) * 1990-11-14 1996-05-15 Konica Corporation Color image forming method
WO1993007541A1 (en) * 1991-10-09 1993-04-15 Spectrum Sciences B.V. Reflection enhancement of images
US5339146A (en) * 1993-04-01 1994-08-16 Eastman Kodak Company Method and apparatus for providing a toner image having an overcoat
US5912097A (en) * 1993-07-06 1999-06-15 Eastman Kodak Company Electrostatographic method using an overlay toner
US5702852A (en) * 1995-08-31 1997-12-30 Eastman Kodak Company Multi-color method of toner transfer using non-marking toner and high pigment marking toner
US5794111A (en) * 1995-12-14 1998-08-11 Eastman Kodak Company Apparatus and method of transfering toner using non-marking toner and marking toner
US5612777A (en) * 1996-01-11 1997-03-18 Xerox Corporation Method and apparatus for applying a clear toner resin containing lightfastness material to toner images
US5837406A (en) * 1996-05-21 1998-11-17 Agfa-Gevaert, N.V. Toner image resistant to scratching
US5905006A (en) * 1996-07-01 1999-05-18 Agfa-Gevaert, N.V. Toner image resistant to cracking
US5887234A (en) * 1997-12-17 1999-03-23 Eastman Kodak Company Reproduction apparatus providing selectable image quality and gloss
US6535712B2 (en) 2001-07-06 2003-03-18 Hewlett-Packard Company Gloss control method and apparatus with disposable toner cartridges containing clear toners
DE10320064A1 (en) * 2002-10-14 2004-09-02 Nexpress Solutions Llc Method for recognizing a register mark, preferably a colorless or low-color register mark
EP1410910B1 (en) 2002-10-14 2008-12-03 Eastman Kodak Company Method for detecting a register mark, particularly a colorless or low-color register mark

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060020A (en) * 1958-03-20 1962-10-23 Rca Corp Method of electrophotographically producing a multicolor image
GB1074147A (en) * 1963-09-03 1967-06-28 Rank Xerox Ltd Colored electrostatographic toners
DE2042804A1 (en) * 1969-08-29 1971-03-11 Eastman Kodak Co Resin dispersion for use in the electrophoretic deposition of a protective resin layer on an image support material bearing a developed image
DE2262432A1 (en) * 1971-12-24 1973-07-05 Australia Res Lab METHOD AND DEVICE FOR TRANSFERRING IMAGES
DE2513951A1 (en) * 1974-04-03 1975-10-09 Agfa Gevaert Ag METHODS FOR PROTECTING TONER IMAGES

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3060020A (en) * 1958-03-20 1962-10-23 Rca Corp Method of electrophotographically producing a multicolor image
GB1074147A (en) * 1963-09-03 1967-06-28 Rank Xerox Ltd Colored electrostatographic toners
DE2042804A1 (en) * 1969-08-29 1971-03-11 Eastman Kodak Co Resin dispersion for use in the electrophoretic deposition of a protective resin layer on an image support material bearing a developed image
DE2262432A1 (en) * 1971-12-24 1973-07-05 Australia Res Lab METHOD AND DEVICE FOR TRANSFERRING IMAGES
DE2513951A1 (en) * 1974-04-03 1975-10-09 Agfa Gevaert Ag METHODS FOR PROTECTING TONER IMAGES

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629921A1 (en) * 1993-06-18 1994-12-21 Xeikon Nv Electrostatographic printing including the use of colourless toner
EP0725317A1 (en) 1995-01-30 1996-08-07 Agfa-Gevaert N.V. Polymer suspension method for producing toner particles
EP0810482A1 (en) * 1996-05-21 1997-12-03 Agfa-Gevaert N.V. A toner image resistant to scratching
EP0839670A1 (en) * 1996-11-01 1998-05-06 The Stationery Office Limited Security coating of documents
EP1283449A3 (en) * 2001-08-08 2004-03-17 Heidelberger Druckmaschinen Aktiengesellschaft Method for reducing rub-off from a toner image using a phase change composition

Also Published As

Publication number Publication date
JPS58114067A (en) 1983-07-07
ATE12844T1 (en) 1985-05-15
JPH0256668B2 (en) 1990-11-30
AU9158682A (en) 1983-06-23
EP0081887B1 (en) 1985-04-17
AU552848B2 (en) 1986-06-26
NL8105674A (en) 1983-07-18
DE3263176D1 (en) 1985-05-23

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