SIST ISO 2834-2:2008

SLOVENSKI STANDARD
SIST ISO 2834-2:2008
01-junij-2008
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SIST ISO 2834:2002
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Graphic technology - Laboratory preparation test prints - Part 2: Liquid printing inks
Ta slovenski standard je istoveten z: ISO 2834-2:2007
ICS:
87.080 Barvila. Tiskarske barve Inks. Printing inks
SIST ISO 2834-2:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 2834-2:2008

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SIST ISO 2834-2:2008

INTERNATIONAL ISO
STANDARD 2834-2
First edition
2007-12-15


Graphic technology — Laboratory
preparation of test prints —
Part 2:
Liquid printing inks
Technologie graphique — Préparation en laboratoire des impressions
d'essai —
Partie 2: Encres d'impression liquides




Reference number
ISO 2834-2:2007(E)
©
ISO 2007

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SIST ISO 2834-2:2008
ISO 2834-2:2007(E)
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SIST ISO 2834-2:2008
ISO 2834-2:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 2834-2 was prepared by Technical Committee ISO/TC 130, Graphic technology.
This first edition of ISO 2834-2 together with ISO 2834-1:2006 cancels and replaces the third edition
ISO 2834:1999, which has been technically revised. It also incorporates its Technical Corrigendum,
ISO 2834:1999/Cor. 1:2003).
ISO 2834 consists of the following parts, under the general title Graphic technology — Laboratory preparation
of test prints:
⎯ Part 1: Paste inks
⎯ Part 2: Liquid printing inks
⎯ Part 3: Screen printing inks
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SIST ISO 2834-2:2008
ISO 2834-2:2007(E)
Introduction
This part of ISO 2834 describes the test print preparation of liquid inks (gravure and flexography). These test
prints have a homogeneous distribution of ink on a substrate, and a reproducible ink composition and relative
ink coverage. Therefore, they are suitable for optical tests so that the measured reflectance can be assigned
to a known ink coverage. If tests are done only for the characterization of mechanical and/or chemical
properties of links, the user may apply less accurate methods. The methods described in this part of ISO 2834
are used in other International Standards, such as ISO 2846-3, ISO 2846-5 and ISO 2836. The preparation of
test prints for paste inks (lithography) is described in ISO 2834-1 whilst screen inks will be covered in
ISO 2834-3.
In ISO 2834-1, specific operational settings for the “round-to-round” and the “round-to-flat” offset ink printability
testers are provided. Printability testers for liquid inks encompass a much wider array of operating processes
and associated settings. In addition, it is generally acknowledged that it is not possible to directly determine
the actual thickness of an ink film printed by gravure or flexography. Therefore, the guidelines included in this
part of ISO 2834 are more general and will, of necessity, result in more opportunities for operator error when
making the test prints.
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SIST ISO 2834-2:2008
INTERNATIONAL STANDARD ISO 2834-2:2007(E)

Graphic technology — Laboratory preparation of test prints —
Part 2:
Liquid printing inks
1 Scope
This part of ISO 2834 specifies a test method for preparation of test prints produced with liquid water-based or
solvent-based printing inks as used in flexography and gravure printing. These test prints are intended
primarily for optical tests, such as colorimetry, transparency and reflection density as described in ISO 2846-3
and ISO 2846-5. They can also be used for testing gloss, light fastness and the chemical, physical and
mechanical resistance to mechanical and chemical attack regarding either printing ink and/or substrate.
Flexographic inks with higher viscosity, such as those cured by radiation are also covered. This part of
ISO 2834 is not applicable to inks for ink jet printing.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 2431, Paints and varnishes — Determination of flow time by use of flow cups
ISO 2846-3, Graphic technology — Colour and transparency of printing ink sets for four-colour-printing —
Part 3: Publication gravure printing
ISO 2846-5, Graphic technology — Colour and transparency of printing ink sets for four-colour printing —
Part 5: Flexographic printing
ISO 14981, Graphic technology — Process control — Optical, geometrical and metrological requirements for
reflection densitometers for graphic arts use
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
anilox roller
roller with a chromium-plated or a ceramic surface with evenly distributed small cells generally mounted on a
flexographic printing press to control the quantity of ink transferred to the printing forme
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SIST ISO 2834-2:2008
ISO 2834-2:2007(E)
3.2
extender
transparent material (varnish or polymer solution) to reduce the colorant concentration while maintaining
viscosity to adapt ink colour concentration to print substrates
3.3
printing forme for flexography
cylinder or sleeve covered with a relief type rubber or photopolymer plate for application of printing ink to print
substrate
3.4
printing forme for gravure
mechanically or laser-engraved or chemically-etched cylinder, sleeve or plate for application of printing ink to
a print substrate
3.5
printability tester
device for uniformly applying a reproducible amount of ink to a substrate under specified conditions
3.6
retarder
additive to reduce the evaporation speed of the solvent in a liquid ink to prevent drying during the application
of ink to the substrate
3.7
test-ready ink
printing ink of the appropriate composition and viscosity for the purpose of the test
4 Test method
4.1 Principle
Using a printability tester, the gravure or flexographic printing ink is applied consistently and uniformly on the
chosen substrate.
NOTE 1 Test samples for the characterization of mechanical and/or chemical properties of inks can be prepared using
any technique resulting in a uniform ink film in a desired thickness range. Ink film thicknesses different from those used in
practice will have a strong influence on the results of such tests. These methods are not covered by this part of ISO 2834.
NOTE 2 Due to differences between a printing press and a laboratory printability tester, prints produced on a laboratory
printability tester can be different in appearance and in ink film thickness from commercial prints. To reach the same
colour strength or print density, different settings from the actual press settings are generally required.
4.2 Apparatus and quality requirements
4.2.1 Apparatus
Any printability tester specifically designed for liquid printing inks of the type to be tested, liquid printing ink
(solvent, water or radiation cured), substrate and drying apparatus may be used as long as the resulting
printed ink film is uniform and at the required ink film thickness. Test conditions and variables associated with
such equipment and materials shall be agreed upon between parties since variations in design and process
have a strong influence on the test results and comparability of the properties of the test sample.
4.2.1.1 Printability tester.
To ensure repeatable operation, the printability tester shall provide motorized control of the ink transfer
function. It is not practical to duplicate exactly a commercial production printing process in the laboratory.
However, it is possible to duplicate results between two laboratories. The chosen laboratory printability tester
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SIST ISO 2834-2:2008
ISO 2834-2:2007(E)
must provide a consistent, uniform printed ink film at the required ink film thickness. To achieve this control,
the printing speed and the pressure or impression (for flexography) between the printing forme and printing
substrate shall be adjustable, and shall be constant and uniform during the printing process.
For gravure, the Shore hardness of the pressure roller as well as the use of an electrostatic printing aid shall
be agreed upon and specified. For flexography, the anilox roller (see also 4.2.1.3) and the type of blade or
doctoring device shall be agreed upon and specified.
4.2.1.2 Printing formes.
4.2.1.2.1 Gravure printing forme.
These may be produced by electromechanical engraving, laser engraving or etching. Printing formes can
contain solid and tinted areas. The design of printing formes can either be of a standard layout with a
designation of the supplier of the printability tester or special with respect to costumer needs. Printing formes
shall have a designation.
It is not practical to duplicate commercial production printing in the laboratory, and therefore it is not necessary
for the lab printability tester to have the same gravure engraved cylinder
...