EP1834214A2 - Process for relief printing - Google Patents

Process for relief printing

Info

Publication number
EP1834214A2
EP1834214A2 EP05821710A EP05821710A EP1834214A2 EP 1834214 A2 EP1834214 A2 EP 1834214A2 EP 05821710 A EP05821710 A EP 05821710A EP 05821710 A EP05821710 A EP 05821710A EP 1834214 A2 EP1834214 A2 EP 1834214A2
Authority
EP
European Patent Office
Prior art keywords
activable
printing
product
printable medium
anyone
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.)
Withdrawn
Application number
EP05821710A
Other languages
German (de)
French (fr)
Inventor
Herbert Bucher
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.)
Amcor Specialty Cartons Switzerland GmbH
Original Assignee
Amcor Rentsch Rickenbach 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 Amcor Rentsch Rickenbach AG filed Critical Amcor Rentsch Rickenbach AG
Publication of EP1834214A2 publication Critical patent/EP1834214A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/20—Screening processes; Screens therefor using screens for gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0054—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by thermal means, e.g. infrared radiation, heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams

Definitions

  • the invention pertains to a printing process for obtaining relief or embossing effects .
  • Embossing technology requires embossing cylinders comprising the desired patterns to be embossed on the printable medium. Embossing cylinders consist of 2 parts
  • embossing technology cost, since embossing cylinders are much more expensive than printing cylinders .
  • Silkscreen printing involves applying foaming ink on a printable medium.
  • the main drawbacks of silkscreen printing include increased time for letting the foaming ink to rise, additional equipment such as printing units and powerful ovens for the drying process, fuzzy rendering of images and reduced durability of printing tools . Further, the line speed is reduced .
  • the present invention provides a printing process for obtaining relief effects on a printable medium, said printing process comprising the following steps : a . applying a layer of a UV-activable product (i . e . product whose polymerisation is triggered by application of ultraviolet light) on a printing tool, the surface of said printing tool having engraved, direct lasered or etched cells containing said UV- activable product and forming desired patterns; b . applying said printing tool onto said printable medium; c . applying ultraviolet light to said printable medium comprising said UV-activable product .
  • a UV-activable product i . e . product whose polymerisation is triggered by application of ultraviolet light
  • Said UV-activable product may be UV-activable ink, UV- activable varnish or any other UV-activable product .
  • said UV-activable product may be based on a cationic UV-activable system or a radical UV-activable system.
  • said UV-activable product has a solids content of at least 90% and a viscosity rating between 35 and 100 seconds (viscosity rating measured according to the 4 mm DIN cup method) .
  • the printing tool according to the invention may be a printing cylinder, a printing plate or any other printing tool .
  • the printing process according to the invention is preferably gravure printing, but may also consist in any- other printing techniques such as offset printing, etc .
  • the process of the invention is preferably used on foil, semi-rigid packaging material and rigid packaging material as printable medium, but may also be used with any other appropriate printable medium.
  • the process according to the invention is used for printing cigarette packs , where relief effects help differentiating the packaging from competition .
  • the present invention consists in the application of a special varnish at a high layer thickness using existing gravure technique to imitate embossing .
  • a varnish will be applied on the board online with gravure technique using a gravure cylinder without compromising on production speed.
  • the layer thickness needs to be increased significantly, e . g . to a range of 60-100 micron .
  • Such thickness requires special ink type, e . g . - High reactivity varnish to promote fast curing/polymerisation of the thick layer .
  • High solids content ideally 100%, to avoid reduction of the height of the relief during cure and to avoid long drying time due to solvent evaporation.
  • a radical UV-varnish is ideal as it fulfils the above requirements .
  • Cross-linking/polymerisation is initiated via UV-light .
  • the initiation of the polymerisation is also conceivable via heat or other physico-chemical means .
  • Viscosity 35-100 sec (measured according to the 4 mm DIN cup method) solid contents : preferably 90 to 100% reactivity: immediate drying Gravure cylinder :
  • Gravure cylinders for applying UV-varnish are considerably cheaper (one order of magnitude) compared to embossing cylinders .
  • High gloss is obtained without an extra printing step .
  • One application of UV-varnish may be used to attain both relief printing and high gloss .
  • embossing technology an extra layer of high gloss varnish is required.

Abstract

A method for transmitting product information read from an identification tag to another processor and a system therefore. The system finds one application in radio frequency (RFID) tags. The method includes receiving data read from a tag by a tag reader, the data including product data identifying the product to which the tag is attached and tag data uniquely identifying the tag and forwarding the product data but not the tag data to another processor. This ensures that the part of the tag number which specifically identifies the particular product is kept private. This invention has one application in a retail environment where products are tagged with RFID transponders.

Description

005/003876
PROCESS FOR RELIEF PRINTING
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention pertains to a printing process for obtaining relief or embossing effects .
2. Description of the Prior Art Printing processes for obtaining relief effects are known in the prior art and include embossing technology and silkscreen printing .
Embossing technology requires embossing cylinders comprising the desired patterns to be embossed on the printable medium. Embossing cylinders consist of 2 parts
(one male cylinder and one female - or blank - counter cylinder) , milled or etched in metal with gears , sometimes additionally hardened to increase durability . An important drawback of embossing technology is cost, since embossing cylinders are much more expensive than printing cylinders .
Other drawbacks include possible deformation of the embossed medium (especially with line embossing) , and added costs due to the requirement of precise alignment of male and female embossing cylinders .
Silkscreen printing involves applying foaming ink on a printable medium. The main drawbacks of silkscreen printing include increased time for letting the foaming ink to rise, additional equipment such as printing units and powerful ovens for the drying process, fuzzy rendering of images and reduced durability of printing tools . Further, the line speed is reduced .
Accordingly, there is a need for a printing process for obtaining relief effects devoid of the drawbacks present in the prior art .
BRIEF DESCRIPTION OF THE INVENTION
The present invention provides a printing process for obtaining relief effects on a printable medium, said printing process comprising the following steps : a . applying a layer of a UV-activable product (i . e . product whose polymerisation is triggered by application of ultraviolet light) on a printing tool, the surface of said printing tool having engraved, direct lasered or etched cells containing said UV- activable product and forming desired patterns; b . applying said printing tool onto said printable medium; c . applying ultraviolet light to said printable medium comprising said UV-activable product .
Said UV-activable product may be UV-activable ink, UV- activable varnish or any other UV-activable product .
In addition, said UV-activable product may be based on a cationic UV-activable system or a radical UV-activable system.
Preferably, said UV-activable product has a solids content of at least 90% and a viscosity rating between 35 and 100 seconds (viscosity rating measured according to the 4 mm DIN cup method) .
The printing tool according to the invention may be a printing cylinder, a printing plate or any other printing tool . The printing process according to the invention is preferably gravure printing, but may also consist in any- other printing techniques such as offset printing, etc .
The process of the invention is preferably used on foil, semi-rigid packaging material and rigid packaging material as printable medium, but may also be used with any other appropriate printable medium.
Preferably, the process according to the invention is used for printing cigarette packs , where relief effects help differentiating the packaging from competition .
DESCRIPTION OF THE INVENTION
The present invention consists in the application of a special varnish at a high layer thickness using existing gravure technique to imitate embossing . A varnish will be applied on the board online with gravure technique using a gravure cylinder without compromising on production speed. The normal layer thickness applied with gravure for printed board is in the range of 20 - 45 micron wet (= 12 - 27 micron dry at a solids content of 60% ) . In order to imitate embossing, the layer thickness needs to be increased significantly, e . g . to a range of 60-100 micron .
Such thickness requires special ink type, e . g . - High reactivity varnish to promote fast curing/polymerisation of the thick layer . High solids content, ideally 100%, to avoid reduction of the height of the relief during cure and to avoid long drying time due to solvent evaporation. - Medium to high viscosity to avoid λflow out' of varnish after application before it is cured .
A radical UV-varnish is ideal as it fulfils the above requirements . Cross-linking/polymerisation is initiated via UV-light . The initiation of the polymerisation is also conceivable via heat or other physico-chemical means .
Details on the UV-varnish :
Viscosity: 35-100 sec (measured according to the 4 mm DIN cup method) solid contents : preferably 90 to 100% reactivity: immediate drying Gravure cylinder :
In order to apply a thicker layer on the board, deeper cells are needed for the gravure cylinder to enable enough uptake of required ink.
Particularly for large surface reliefs, a special gravure cylinder is required, as scooped out of ink needs to be avoided during the printing process . Therefore, special cell walls have to be designed on the cylinder to avoid that the doctor blade scoops out to the ink in an uncontrolled way . On the other hand, the cell walls need to arrange in such a way that the ink still flows well together and to avoid that flow lines of the varnish are later visible .
In experiments , it was demonstrated that the application of the relief varnish for the imitation of embossing can be applied with conventional gravure technology at usual production speed. The present invention provides the following advantages over prior art printing processes for obtaining relief effects :
Gravure cylinders for applying UV-varnish are considerably cheaper (one order of magnitude) compared to embossing cylinders .
Reduced preparation times in comparison to embossing cylinders, which require alignment of male and female cylinders . - Reduced number of printing units and printing cylinders required when printing different types of patterns , such as dots and larger surfaces , on a same printable medium. The invention allows to obtain all types of patterns with only one printing unit and one gravure cylinder .
High gloss is obtained without an extra printing step . One application of UV-varnish may be used to attain both relief printing and high gloss . With embossing technology, an extra layer of high gloss varnish is required.
Use of existing gravure equipment and technology .

Claims

1. A printing process for obtaining relief effects on a printable medium, said printing process comprising the following steps : a . applying a layer of a UV-activable product on a printing tool, the surface of said printing tool having engraved cells containing said UV-activable product and forming desired patterns ; b . applying said printing tool onto said printable medium; c . applying ultraviolet light to said printable medium comprising said UV-activable product .
2. A printing process for obtaining relief effects on a printable medium, said printing process comprising the following steps : a . applying a layer of a UV-activable product on a printing tool, the surface of said printing tool having direct lasered or etched cells containing said UV-activable product and forming desired patterns ; b . applying said printing tool onto said printable medium; c . applying ultraviolet light to said printable medium comprising said UV-activable product .
3. The process of claims 1 or 2 , characterized in that said UV-activable product is selected from the group consisting of UV-activable inks and UV- activable varnishes .
4. The process of anyone claims 1 to 3, characterized in that said UV-activable product is selected from the group consisting of cationic UV-activable products and radical UV-activable products
5. The process of anyone of claims 1 to 4 , characterized in that said UV-activable product has a solids content of at least 90% .
6. The process of anyone of claims 1 to 5 , characterized in that said UV-activable product has a viscosity rating between 35 and 100 seconds , as measured according to the 4 mm DIN cup method.
7. The process of anyone of claims 1 to 6, characterized in that said printing tool is a printing cylinder .
8. The process of anyone of claims 1 to 7 , characterized in that said printing process is gravure printing .
9. The process of anyone of claims 1 to 8 , characterized in that said printable medium is selected from a group consisting of foil, semirigid packaging material and rigid packaging material .
10. The process of anyone of claims 1 to 9 , characterized in that said printable medium is a cigarette pack .
EP05821710A 2005-01-07 2005-12-23 Process for relief printing Withdrawn EP1834214A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IB2005000033 2005-01-07
PCT/IB2005/003876 WO2006072824A2 (en) 2005-01-07 2005-12-23 Process for relief printing

Publications (1)

Publication Number Publication Date
EP1834214A2 true EP1834214A2 (en) 2007-09-19

Family

ID=36216849

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05821710A Withdrawn EP1834214A2 (en) 2005-01-07 2005-12-23 Process for relief printing

Country Status (2)

Country Link
EP (1) EP1834214A2 (en)
WO (1) WO2006072824A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8607974B2 (en) * 2008-12-22 2013-12-17 British America Tobacco (Holdings) Limited Pack for smoking articles
IT202000015622A1 (en) * 2020-06-29 2020-09-29 Neos S R L PROCESS FOR CREATING A THREE-DIMENSIONAL PATTERN ON A RIGID SUPPORT, AND EQUIPMENT FOR CARRYING OUT SUCH PROCESS

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB432716A (en) * 1934-01-29 1935-07-29 Robinson E S & A Ltd Improvements in or relating to letterpress or relief printing
JPS5636654A (en) * 1979-09-04 1981-04-09 Tomoegawa Paper Co Ltd Electrostatic recording material
JPH02139238A (en) * 1988-09-13 1990-05-29 Sony Corp Form cylinder device of intaglio
CA2065121C (en) * 1992-04-03 1997-06-24 Roger Boulanger Method and apparatus for printing a fibrous web
DE4324577C1 (en) * 1993-07-22 1994-12-15 Ver Glaswerke Gmbh Printing form for a high-pressure process, use of the printing form for printing on glass surfaces and process for producing a printing form having a printing screen for the flexographic printing process
FR2720976B1 (en) * 1994-06-08 1996-07-12 Pechiney Emballage Alimentaire Rotogravure printing process with solvent-free inks.
JPH08258497A (en) * 1995-03-17 1996-10-08 Nissha Printing Co Ltd Three-dimensional stereogram transfer sheet and cubic body decorated with pattern having three-dimensional stereogram
GB2303094A (en) * 1995-07-12 1997-02-12 Bernard John Boyle Laser engraved ceramic gravure cylinder
KR20000041352A (en) * 1998-12-22 2000-07-15 강우식 Printing method of three-dimensional picture using gravure printing
IL129076A (en) * 1999-03-21 2002-02-10 Creoscitex Corp Ltd Gravure short run printing plate and method for using the same
WO2002026496A1 (en) * 2000-09-29 2002-04-04 Creo Il. Ltd. Method for producing short run gravure printing plates using lithographic plates
US20050208275A1 (en) * 2002-05-30 2005-09-22 Kazuhiro Abe Decorative material and decorative sheet
JP4530393B2 (en) * 2002-12-02 2010-08-25 株式会社シンク・ラボラトリー Gravure plate making factory

Non-Patent Citations (1)

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Title
See references of WO2006072824A3 *

Also Published As

Publication number Publication date
WO2006072824A2 (en) 2006-07-13
WO2006072824A3 (en) 2006-09-21

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