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WO2002030678A2 - Procede de reduction d"artefacts d"impression non desires - Google Patents

Procede de reduction d"artefacts d"impression non desires Download PDF

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Publication number
WO2002030678A2
WO2002030678A2 PCT/CA2001/001426 CA0101426W WO0230678A2 WO 2002030678 A2 WO2002030678 A2 WO 2002030678A2 CA 0101426 W CA0101426 W CA 0101426W WO 0230678 A2 WO0230678 A2 WO 0230678A2
Authority
WO
WIPO (PCT)
Prior art keywords
printing plate
positive
border
working
selectable width
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.)
Ceased
Application number
PCT/CA2001/001426
Other languages
English (en)
Other versions
WO2002030678A3 (fr
Inventor
Bradley J. F. Palmer
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.)
Creo SRL
Original Assignee
Creo SRL
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 Creo SRL filed Critical Creo SRL
Publication of WO2002030678A2 publication Critical patent/WO2002030678A2/fr
Publication of WO2002030678A3 publication Critical patent/WO2002030678A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/20—Curved printing plates, especially cylinders made of metal or similar inorganic compounds, e.g. plasma coated ceramics, carbides

Definitions

  • the invention pertains to the field of printing and in particular to the manufacture and processing of printing plates.
  • Irradiation and processing of printing plates is central to offset printing. Given the nature of economics in the printing industry it is important that all available exposable surface of a printing plate be used as efficiently as possible in rendering images on a printed medium.
  • irradiation is used in what follows to denote the use of a form of radiation that will cause the imageable material on the printing plate to change so that processing will either cause the irradiated material to be removed and the un-irradiated to remain, or cause the un-irradiated to be removed and the irradiated to remain.
  • Different kinds of printing plates respond in this way to different forms of radiation.
  • negative is used here to denote a situation where the areas of imageable material on the plate that are irradiated by the irradiation system, will ultimately remain on the plate.
  • the rest of the imageable material will be removed through either ablation during the irradiation process, or through subsequent chemical processing.
  • This results in a finished printing plate on which the areas where imageable material has been removed to expose an hydrophilic base (such as aluminum) will retain water and will therefore not be inked.
  • the areas of the plate that are not exposed in this way retain their hydrophobic imageable material and will be inked, the ink not wetting areas that retain water. The result is that areas of plate that are exposed will be printed.
  • negative working printing plates and “negative working imageable material” when denoting this "negative” process.
  • the issue described here also pertains when the printing plate is processed on a plate-setter in portrait mode, but employed in landscape mode on the printing press.
  • the edge or border regions of the printing plate that are distorted by clamping in the plate-setter become free edges on the press and will retain ink and cause printing artifacts on the periphery of the image being printed.
  • the surface of a positive working printing plate is rendered water retentive in the area where the plate is to be mechanically held or deformed during imaging.
  • FIG.l shows a printing plate mounted for imaging.
  • FIG.2 shows a printing plate with imageable material absent from its border area.
  • FIG.3 shows a positive working printing plate with a border covered in hydrophilic material.
  • FIGS. 4A, 4B and 4C depict the process for irradiating a positive working plate to create a hydrophilic border.
  • FIG.1 Illustrates the essence of the preferred embodiment of a method of the invention.
  • a positive working printing plate 1 is mounted by means of mechanical fixtures 3 and 4 on the drum 2 of the machine on which it is to be imaged.
  • Printing plate 1 is slotted in under the mechanical fixtures 3 and 4 to a certain depth.
  • the printing plate 1 has mechanical deformations 5 and 6. It is to be noted that we depict here just one possible means of mounting a printing plate. There are various other mechanical arrangements by which plates are, or could be, held in position during imaging, all sharing the basic issue of parts of the plate being obscured and parts being deformed.
  • the printing plate 1 has a border 7 of extent at least equal to the depth to which the printing plate 1 is obscured by the mechanical fixtures 3 and 4 from any imaging beam intended to irradiate it.
  • Border 7 preferably extends to the additional extent of the deformations 5 and 6. Since the plate may be rotated by 90 degrees between being imaged and being used on a press, the border preferably extends around the entire circumference of the printing plate. It is not always necessary for the border to extend all of the way around the printing plate.
  • the border may be limited to areas in which imaging is affected by fixture and/or mechanical deformation. Such areas may be only on two sides of the plate or on portions of sides of the plate.
  • the border is preferably created on both faces of the printing plate.
  • the width of this border is selectable.
  • the border as described here, as "a selectable width of border”.
  • face will be used with reference to printing plates to denote the flat surface of the printing plate. A plate with imageable material on both flat surfaces will therefore be referred to as having two "faces”.
  • the bulk of the printing plate is coated with a positive working imageable layer 8 and the border is not coated, leaving the bare hydrophilic aluminum base 9 as the exposed surface in the border.
  • the border is not coated, leaving the bare hydrophilic aluminum base 9 as the exposed surface in the border.
  • This particular embodiment ensures that the problem of undesirable artifacts on the periphery of the final printed image will be avoided altogether.
  • the artifacts described here will be referred to as "printing process-induced artifacts”.
  • the entire plate is coated with a positive working imageable layer 8 during manufacture. Before the printing plate is imaged, this layer is removed in the border area, by either mechanical means or chemical means, to physically expose the hydrophilic base 9.
  • the entire printing plate is coated with positive working imageable layer 8.
  • the border is coated with a hydrophilic material layer 10.
  • An example of such material is the imaging material employed in negative working printing plates.
  • FIG.4 A the entire printing plate comprising a hydrophilic base 9 (which may comprise an aluminum base layer), is covered in a coating of positive working imageable material 8 during manufacture.
  • FIG.4B the border area of the positive working printing plate is irradiated prior to imaging.
  • FIG.4C the irradiated material is then removed either through ablation during the irradiation or by a subsequent processing step. This renders the border area hydrophilic by physically exposing the underlying aluminum base 9 before the plate is placed on the machine on which it is to be imaged.
  • the irradiation may be performed by means of a contact frame and an illumination source in the case of photosensitive imageable materials, or by means of a powerful heat source in the case of heat mode, or thermally activated, imageable materials.
  • the heat source may be applied by bringing it into direct contact with the surface to be thermally treated. This may be done, for example, using a heated frame. Heating may also be achieved without direct contact. For example, achieved with laser irradiation.
  • the terms "heat mode imageable material”, “thermally activated imageable material” and “thermal resist” all refer to materials that may be imaged using heat rather than light. In either case, the plate may also have its border irradiated on an additional off-line plate-setter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)

Abstract

Selon l"invention, on rend rétentrice d"eau la surface d"une plaque d"impression positive, dans la zone où cette plaque doit être supportée ou déformée mécaniquement, pendant la formation d"image, ce qui permet de réduire l"incidence d"artefacts d"impression.
PCT/CA2001/001426 2000-10-12 2001-10-12 Procede de reduction d"artefacts d"impression non desires Ceased WO2002030678A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US68752100A 2000-10-12 2000-10-12
US09/687,521 2000-10-12

Publications (2)

Publication Number Publication Date
WO2002030678A2 true WO2002030678A2 (fr) 2002-04-18
WO2002030678A3 WO2002030678A3 (fr) 2002-06-13

Family

ID=24760743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/001426 Ceased WO2002030678A2 (fr) 2000-10-12 2001-10-12 Procede de reduction d"artefacts d"impression non desires

Country Status (1)

Country Link
WO (1) WO2002030678A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1256461A3 (fr) * 2001-05-11 2005-01-19 Fuji Photo Film Co., Ltd. Procédé de dévelopement de plaque lithographiques et plaques ainsi obtenues

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5359933A (en) 1992-03-30 1994-11-01 Heidelberger Druckmaschinen Ag Clamping and tensioning device for a printing plate in a printing machine
US6063544A (en) 1997-03-21 2000-05-16 Kodak Polychrome Graphics Llc Positive-working printing plate and method of providing a positive image therefrom using laser imaging

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU7225187A (en) * 1986-05-01 1987-11-05 Minnesota Mining And Manufacturing Company Method and underpacking for mounting printing plates on a rotary printing press
US5345870A (en) * 1993-02-10 1994-09-13 Miles Inc. "Direct-to-press" positive lithographic printing plate and method for making same
AU722433B2 (en) * 1997-03-05 2000-08-03 Presstek, Inc. Lithographic printing system with reusable support surfaces and lithographic constructions for use therewith

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5359933A (en) 1992-03-30 1994-11-01 Heidelberger Druckmaschinen Ag Clamping and tensioning device for a printing plate in a printing machine
US6063544A (en) 1997-03-21 2000-05-16 Kodak Polychrome Graphics Llc Positive-working printing plate and method of providing a positive image therefrom using laser imaging

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1256461A3 (fr) * 2001-05-11 2005-01-19 Fuji Photo Film Co., Ltd. Procédé de dévelopement de plaque lithographiques et plaques ainsi obtenues

Also Published As

Publication number Publication date
WO2002030678A3 (fr) 2002-06-13

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