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FLEXO Magazine : July 2009
DESIGN A “Proof Compliance Cover Sheet” or label must accompany the contract proof submitted for color match at press and approved by the customer. It should identify the proofing product or system used and the company supplying the proof (contact name, telephone & fax numbers) as well as operator, date, job number, and customer. The cover sheet must also contain information needed to verify the proof’s compliance to the technical attributes required for that proofing type. It is a best practice approach for all proofs to include a “Certificate of Result” . It should include all pertinent measurements: density, dot area, Delta E @ 100% & 50%,trap, print contrast, bar code scan analysis, etc. Proof densities should be within the printers’ on-press density specifications. The Proof Compliance Cover Sheet and Certificate of Result can be combined into one document. Soft Proof: The soft proof consists of viewing a job on a color-calibrated monitor. It is used at any point in the product development process from a concept proof to a contract proof, depending on how well the system is calibrated. Components include a color consistent monitor and a color management system (CMS). CGS Publishing Technologies International AGFA 2.4b: Types of Proofs: Before a contract proof can be accurately used, the entire reproduction system must be characterized so that the proofing system is calibrated to match the printed result. 2.5 Process Control Test Elements Application: If consistency and repeatability are important to the customer, then space must be allocated on the sheet, web, or package for appropriate process control test elements. Measuring at set-up and throughout the run enables the printer to produce repeatable, consistent and accurate results on every job. Placement: In order for the printer to deliver the desired print results, the customer and design team must include key test elements in the product design. Some packaging lends itself to placing test elements under flaps, in a glue zone or on the waste matrix; other packaging requires the test elements to remain visible on the finished package. Therefore, each print application should determine where to place the individual elements to be monitored throughout the production run. The designer should consult with the printer and CPC on the necessary test elements and properly place them on the package/sheet/web when creating the design. Test Element Construction: Size: The designer must be careful to allocate enough room for the necessary elements of the process control target. ANSI/CGATS.5 (2003 Graphic Technology – Spectral Measurement and Colorimetric Computation for Graphic Arts Images) provides the minimum and recommended apertures (and therefore minimum test element size) specified by line screen listed in the following table. While these guidelines are useful, the print application must also be considered. The minimum acceptable aperature may be larger for some print applications. The designer and prepress provider should confirm individual test element size with the printer. For direct-print corrugated, each test patch (solid or tint) should be 2X-3X the flute width to provide a stable measurement target.
Sustainable Spring 2009