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FLEXO Magazine : July 2009
DESIGN 3.1.2 Process Color Type When identifying colors for text copy, the designer should be aware which colors will be built from process and which will use dedicated spot colors. In general, text copy should be printed with a single color or built from two process colors. As text size increases, a third process color may be introduced. Using more than one color to create text should be discussed with both the prepress and print providers to determine capability. 3.1.3 Process Reverse/Knockout A holding line should be used when type is reversed and comprised of more than one color. The holding line should be a single, dark color to hide any slight misregistration that is likely to occur during the printing process. The weight of the holding line should be twice the registration tolerance for the print segment as identified in Table 3.1.1, Total Trap Tolerance. Because the values provided are general guidelines, the designer should confirm the trap requirements with the prepress and print providers. If a holding line is not used, the darkest or predominant color should be made at full size and the remaining color must be choked back the width of one row of dots as determined by the screen ruling. If possible, the background color should be limited to one color. 3.1.4 Line Reverse/Knockout Reverse copy should be limited to one color. If copy is to be reversed from two or more colors, a holdback or choke must be created for register. Refer to Table 3.1.1 Image Trap Tolerance and the specific print segment. Because the values are general guidelines and print system dependent, the designer should confirm the trap requirement for reverse text with the prepress and print provider. 3.1.5 Drop Shadow If a drop shadow is abutting another color, it will need to trap. Be sure to move the drop shadow by more than twice the specified image trap for the appropriate print segment. Refer to Design Section 3.1.1 for segment specific guidelines on total trap tolerance. It is best to use only drop shadows for larger type, unless the color selected for the type is darker than the color it is abutting; remember, these abutting colors will be required to overprint each other to form the image trap. PROPER IMPROPER S. Gilbert 3.1.5: Drop Shadow: If inappropriate image trap tolerances are applied (such as using offset traps on a flexo job), objectionable type will result. NOT SUPPORTED BY FIRST: Reversed type without a holding line or lighter color choked back will result in misregister and legibility problems. FIRST RECOMMENDED: Reversed type with holding line – the weight of the holding line should be twice the image trap tolerance. FIRST RECOMMENDED: Reversed type with magenta choked back to allow for trap tolerance.
Sustainable Spring 2009