SIST ISO 2846-2:2008

SLOVENSKI STANDARD
SIST ISO 2846-2:2008
01-junij-2008
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SIST ISO 2846-2:2005
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Graphic technology - Colour and transparency of printing ink sets for four-colour printing
- Part 2: Coldset offset lithographic printing
Ta slovenski standard je istoveten z: ISO 2846-2:2007
ICS:
17.180.20 Barve in merjenje svetlobe Colours and measurement of
light
87.080 Barvila. Tiskarske barve Inks. Printing inks
SIST ISO 2846-2:2008 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ISO 2846-2:2008

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SIST ISO 2846-2:2008

INTERNATIONAL ISO
STANDARD 2846-2
Second edition
2007-12-15

Graphic technology — Colour and
transparency of printing ink sets for four-
colour printing —
Part 2:
Coldset offset lithographic printing
Technologie graphique — Couleur et transparence des gammes
d'encre d'impression en quadrichromie —
Partie 2: Impression lithographique offset rotatif coldset




Reference number
ISO 2846-2:2007(E)
©
ISO 2007

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SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
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ii © ISO 2007 – All rights reserved

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SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Test method.2
4.1 Principle.2
4.2 Test print preparation.2
5 Requirements for colour, transparency and ink film thickness range.3
5.1 Colour .3
5.2 Transparency characteristics.4
5.3 Ink film thickness range.4
Annex A (normative) Reference substrate .5
Annex B (informative) Detailed explanation of testing including examples .6
Annex C (informative) Spectral data.9
Bibliography .11

© ISO 2007 – All rights reserved iii

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SIST ISO 2846-2:2008
ISO 2846-2:2007(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 2846-2 was prepared by Technical Committee ISO/TC 130, Graphic technology.
This second edition cancels and replaces the first edition (ISO 2846-2:2000), of which Clauses 4 and 5 have
been technically revised and the colorimetric properties of the inks were adjusted to be compatible with actual
[1]
commercial requirements and to the process standard ISO 12647-3 . Details for test print preparation, which
are now specified in ISO 2834-1, have been deleted.
ISO 2846 consists of the following parts, under the general title Graphic technology — Colour and
transparency of printing ink sets for four-colour printing:
⎯ Part 1: Sheet-fed and heat-set web offset lithographic printing
⎯ Part 2: Coldset offset lithographic printing
⎯ Part 3: Publication gravure printing
⎯ Part 4: Screen printing
⎯ Part 5: Flexographic printing
iv © ISO 2007 – All rights reserved

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SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
Introduction
The initial draft of ISO 2846-2 was prepared by ISO/TC 130 for materials and process control. They examined
the colorimetric properties of commercial coldset web offset inks from around the world and found that a single
set of colour coordinates could adequately represent these, within reasonable tolerances. Since the initial
publication of this part of ISO 2846, additional coordination between the various national bodies participating
in ISO/TC 130 has suggested that some minor refinements of the colorimetric aims would make them more
[1]
compatible with actual commercial printing requirements and to the process standard ISO 12647-3 .
This part of ISO 2846 will allow printers to obtain sets of process inks from various sources which will produce
a similar colour when printed on the reference substrate at the appropriate film thickness. This will allow colour
separations for coldset web offset printing to be based on known colour standards. The colorimetric
characteristics specified in this part of ISO 2846 may only be obtained when the inks are printed on the
reference substrate. However, similarity of two inks on the reference substrate will ensure similarity on another
substrate.

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SIST ISO 2846-2:2008

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SIST ISO 2846-2:2008
INTERNATIONAL STANDARD ISO 2846-2:2007(E)

Graphic technology — Colour and transparency of printing ink
sets for four-colour printing —
Part 2:
Coldset offset lithographic printing
1 Scope
This part of ISO 2846 specifies the colour and transparency to be produced by inks intended for four-colour
coldset web offset printing when printed under specified conditions on a printability tester. It also describes the
test method to ensure conformance.
This part of ISO 2846 is not applicable to fluorescent inks and does not specify pigments (or spectral
reflectance) so as not to preclude the use of future suitable pigment combinations and still claim compliance
with its colorimetric requirements.
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 536, Paper and board — Determination of grammage
ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method
ISO 2834-1, Graphic technology — Laboratory preparation of test prints — Part 1: Paste inks
ISO 8791-4, Paper and board — Determination of roughness/smoothness (air leak methods) — Part 4: Print-
surf method
ISO 13655, Graphic technology — Spectral measurement and colorimetric computation for graphic arts
images
ANSI/CGATS.5:2003, Graphic technology — Spectral measurement and colorimetric computation for graphic
arts images
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
coldset printing
web offset printing without accelerated drying
NOTE Ink sets by absorption into the substrate.
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SIST ISO 2846-2:2008
ISO 2846-2:2007(E)
3.2
standard ink
ink, intended for four-colour printing, which, when printed on the reference substrate and within the applicable
range of ink film thicknesses, complies to the colorimetric and transparency specifications of this part of
ISO 2846
3.3
primary colours
colours of individual prints from yellow, magenta and cyan inks
NOTE If the prints are produced as specified in this part of ISO 2846 and conform to the colorimetric characteristics
specified, they are standard primary colours.
3.4
transparency
ability of an ink film to transmit light, generally expressed as some measure of the unwanted scattering
3.5
transparency measurement value
T
reciprocal of the slope of the regression line between ink film thickness and colour difference for overprints of
chromatic inks over black
4 Test method
4.1 Principle
Each ink is printed on the reference substrate described in Annex A at a range of ink film thicknesses. The
colours which result are measured colorimetrically.
Transparency is evaluated by printing each of the three primary colours on a black substrate at a range of film
thicknesses. The CIELAB colour difference is determined for each sample, between the printed and unprinted
black, and the linear regression coefficient (slope of the regression line) between ink film thickness and colour
difference is calculated for each colour.
For a detailed description of procedures, together with examples, see the informative Annex B.
4.2 Test print preparation
4.2.1 Prints for colorimetric evaluation
For each of the inks to be evaluated, a number of test prints shall be made using a printability tester, each
produced at a different ink film thickness in accordance with the conditions specified in ISO 2834-1. They shall
be made on the reference substrate as specified in Annex A. The sample material shall be kept in the dark
under standard conditions of 23 °C and 50 % RH. The range of ink film thicknesses produced shall
encompass that specified in 5.3. In cases where the approximate ink film thickness is known to result in the
closest match of the target
...