ISO 12647-9:2021
Graphic technology — Process control for the production of half-tone colour separations, proof and production prints — Part 9: Metal decoration printing processes using offset lithography
This document specifies requirements for systems that are used to produce offset prints for process colour reproduction on metallic substrates, which have been printed with a white coating. It is intended for flat printed sheet metal applications. It does not cover shaped or pre-formed metal such as pre-formed cans. Recommendations are provided with regard to appropriate test methods associated with these requirements.
This document differs from the method used to produce an offset print on paper or board in ISO 12647-2 in that it considers the colour values of a typical white coated metal substrate intended for metal decoration, using offset lithography and substrates that are independent of backing colour.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 General
4.2 Data files and printing forms
4.2.1 Data delivery
4.2.2 Printing forme quality
4.2.3 Screen frequency (periodic screens)
4.2.4 Dot size (non-periodic screens)
4.2.5 Screen angle (periodic screens)
4.2.6 Dot shape and its relationship to tone value (periodic screens)
4.2.7 Tone value sum
4.2.8 Grey reproduction and grey balance
4.3 Proof or production print
4.3.1 General
4.3.2 Visual characteristics of image components — Print substrate colour
4.3.3 Ink set colours (colorant description)
4.3.4 Tone value reproduction limits
4.3.5 Tone value increase and spread
4.3.6 Tolerance for image positioning
4.3.7 Conformance
5 Measurement methods
5.1 Computation of densities, CIELAB colour coordinates and CIELAB colour differences
5.2 Control strip
Annex A (informative) Grey reproduction and grey balance
Annex B (informative) Handling differences in coating colour
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
4.1 General
4.2 Data files and printing forms
4.2.1 Data delivery
4.2.2 Printing forme quality
4.2.3 Screen frequency (periodic screens)
4.2.4 Dot size (non-periodic screens)
4.2.5 Screen angle (periodic screens)
4.2.6 Dot shape and its relationship to tone value (periodic screens)
4.2.7 Tone value sum
4.2.8 Grey reproduction and grey balance
4.3 Proof or production print
4.3.1 General
4.3.2 Visual characteristics of image components — Print substrate colour
4.3.3 Ink set colours (colorant description)
4.3.4 Tone value reproduction limits
4.3.5 Tone value increase and spread
4.3.6 Tolerance for image positioning
4.3.7 Conformance
5 Measurement methods
5.1 Computation of densities, CIELAB colour coordinates and CIELAB colour differences
5.2 Control strip
Annex A (informative) Grey reproduction and grey balance
Annex B (informative) Handling differences in coating colour
Bibliography