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FLEXO Magazine : January 2013
and measure combinations of spot color inks, instead each ink is characterized in conjunction with a print sub- strate by means of its spectral characteristics and opacity Definition of minimal number of tone values, measure- ment condition, background, etc... TVI curves defining spot colors must be measured with spectral density using correct bandwidth for solid, and the same bandwidth for the tint. The CIELAB tolerances for the solids and spot colors from ISO 12647-6 are shown on page 24. Deviation from these values is for discussion between sender and receiver A Deviation Tolerance of +/- 6 h° for spot colors if considering: • Different print process applications (e.g. offset, digital) • Usage of a digital characterization for the master (e.g. Pantone Live) 13. REPORTING OF PRESS AIMS (ISO 12647-6 ANNEX C) The suggested reporting of press aims is discussed in ISO 12647-6 Annex C, which is included in the table on page 24. 14. DESIGN PRINTS The requirements for designer prints (validation prints) is contained in ISO 12647-8, Graphic Technology --- Process Control for the Production of Halftone Color Separations, Proof and Production Prints---Part 8: Validation Print Processes Working Directly from Digital Data. This is designed for non- contract proofs, prints, comps providing tools for colors aims and tools for process control and validation of print. 15. PROOFING The requirements for digital proofs are defined in ISO 12647- 7, Graphic Technology--- Process Control for the Production of Halftone Color Separations, Proof and Production Prints --- Part 7: Proofing Processes Working Directly from Digital Data Some of the constraints included are: • Proofs must contain an ISO tint scale for verification • Where spot colors are used, the spot color and tints shall be included on the proof for process control • Substrates must be same as printing job or per standard • Substrates have light fast qualities per standards • Control scales tolerances shall be according to standard or per agreement between sender and receiver If spot/special/brand color are used in a particular design, the proof control strip should, when applicable, include the relevant special color solid rendering 16. SOFT PROOFING The current documentation covering soft proofing is being revised and is included in: • ISO 14861, Graphic Technology --- Color Proofing Using Electronic Displays • ISO 12646, Graphic Technology --- Displays for Color Proofing --- Characteristics and Viewing Conditions • ISO 3664,Graphic Technology and Photography --- View- ing Condition 17. POST PROCESSING Post processing and finishing are common in packaging applications. A detailed work was made and is available from The As- sociation of the GraphicArts (TAGA) Italy and could be used. 18. COA & COC TESTING COA/COC testing is required by CPCs. These tests are designed to insure that all packaging components will main- tain the desired design intent and equity by withstanding the rigors of converting operations, transportation, and distribu- tion chain to retail. Typical testing required could be: • Brand Color Validation -- Print Quality • Sutherland Rub Test -- American Society for Testing and Materials (ASTM) D-5264-98 • Alcohol Rub • Scratch Resistance Test • Tape Test -- ASTM D3359 • Light Fastness Testing • Slip Angle Test, Burst Test • Brand Color Statistical Process Control Reporting -- Print Quality • Flop Index (metallic inks) 18. PRELIMINARY CHECKLIST FOR COMPLIANCE: ISO WG13 / Packaging Schema Design File ISO 15930 PDFX 1.7 or higher 0.50 Validation Print - ISO 12647-8 0.50 Preflight Approved ISO15390 GWG 2012 specifications 0.50 File Delivery to Pre-Media or Printer 0.00 Viewing Conditions ISO 3664:2009 0.50 Spectrophotometer / Certification ISO 5.0, ISO 13655, ASTM284 0.50 Proofing - ISO 12647-7 0.50 Substrates - see aims and agreed tolerances 0.50 Plates - see annexes (ISO 12647-6 Flexograpy) 12647-5 Digital 0.25 Inks 12647-6, see annexes 0.75 Printing - see annex A, B C or D for print type i.e. FIRST, ISO 12647 - series, GAA 0.75 Mechanical i.e. Die / Varnish TAPPI # 0.91 Process Control Documentation 0.50 Spot Color Management/ TVI ISO 12647-6:2012 0.50 Process Analysis 0.25 Material Testing Preformed & Meets Requirements per customers 0.91 Total Score 8.32 About the Author: Steve Smiley is president/owner Smiley- Color & Associates LLC and a G7 process control expert. Both he and the firm specialize in providing and improving supply chain communications through audits, training and global certifica- tion tools. SmileyColor is an active member of FTA, ICC, CGATS, ISO, GWG and IDEAlliance Print Properties. 26 FLEXO JANUARY 2013 www.flexography.org