ISO 2846-2-2017 Printing technology – Colour and transparency of four-colour printing inks – Part 2: Cold-set offset lithography

preface
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to set international standards. The draft international standards adopted by the Technical Committee will be circulated to member bodies for voting. Publication as an international standard requires approval by at least 75% of member bodies.

Please note that certain contents of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents.

ISO 2846-2 was developed by the Technical Committee ISO/TC 130, Graphic Technology.

The second edition cancels and replaces the first edition (ISO 2846-2:2000), in which articles 4 and 5 have been technically revised and the colorimetric characteristics of inks have been adjusted to meet actual commercial requirements and process standard ISO 12647-3[1]. The test print readiness details specified in ISO 2834-1 have now been removed.

ISO 2846 consists of the following sections under the general heading Graphics Technology – Color and Transparency of printing ink sets for four-colour printing:

— Part 1: Sheet-fed and heat-set web offset lithography

— Part 2: cold-set offset lithography

— Part 3: Intaglio printing of publications

— Part 4: Screen printing

— Part 5: Flexographic printing

ISO 2846-2-2017 Printing technology – Colour and transparency of four-colour printing inks – Part 2: Cold-set offset lithography

introduce
The first draft of ISO 2846-2 was written by ISO/TC 130 for material and process control. They examined the colorimetric properties of commercial cold-set web offset inks from around the world and found a set of color coordinates that adequately represented these color coordinates within reasonable tolerances. Since this part of ISO 2846 was first published, additional coordination between the various national agencies involved in ISO/TC 130 has shown that minor improvements to the contrasting color target will bring it more in line with the actual commercial printing requirements and process standard ISO 12647-3 [1].

This part of ISO 2846 will allow printers to obtain sets of printing inks from a variety of sources that will produce similar colours when printed on a reference substrate at the appropriate film thickness. This will allow color separation of cold-set offset printing based on known color standards. The colorimetric properties specified in this part of ISO 2846 can only be obtained when the ink is printed on a reference substrate. However, the similarity of the two inks on the reference substrate will ensure the similarity on the other substrate.

1 range
This part of ISO 2846 specifies the color and transparency of inks used for four-color cold-set web offset printing when printed on a printability tester under specified conditions. It also describes testing methods to ensure consistency.

This part of ISO 2846 does not apply to fluorescent inks and does not specify pigments (or spectral reflectance) so as not to rule out future use of suitable pigment combinations and still claim to meet its colorimetric requirements.

2 Normative references
The following reference documents are not available or available for use in this document. For dated references, citation-only versions apply. For undated references, the new version of the reference (including any revisions) applies.

ISO 536, paper and board – Determination of gram weight

ISO 2471, Paper and board – Determination of opacity (paper backing) – diffuse reflection method

ISO 2834-1, Graphic techniques – Laboratory preparation of test prints – Part 1: pasting inks

ISO 8791-4, paper and board – Determination of roughness/smoothness (air leakage method) – Part 4: printing surf method

ISO 13655, Graphic Techniques – Spectral measurement and chrominance calculation of graphic art images

ANSI/CGATS. 5:2003, Graphic Techniques — Spectral measurement and chrominance calculation of graphic art images

ISO 2846-2-2017 Printing technology – Colour and transparency of four-colour printing inks – Part 2: Cold-set offset lithography

3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Cold set printing

Web offset printing without accelerated drying

Note 1: The ink set is absorbed into the substrate.

3.2 Standard Ink

Inks for four-colour printing, printed on a reference substrate and printed within the applicable ink film thickness range, comply with the colorimetric and transparency specifications in this part of ISO 2846

3.3 Primary Color

The color of individual prints with yellow, magenta, and cyan inks

Note 1 Prints are standard primary colors if they are produced in accordance with this part of ISO 2846 and conform to specified colorimetric characteristics.

3.4 Transparency

The ability of an ink film to transmit light is usually expressed as some measure of unwanted scattering

3.5 Transparency measurement T

The reciprocal of the slope of the regression line between the film thickness and the color difference of the color ink overprint on black

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.

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