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FLEXO Magazine : July 2009
DESIGN 3.3.3 USPS Intelligent Mail Bar Code The Intelligent Mail Bar Code (CB4), used by the United States Postal Service (USPS), is a 4-state bar code that consists of 65 bars. The information in this section was obtained from the United States Postal Service Intelligent Mail Bar Code specification USPSB-3200C. Dimensional Parameters Horizontal Dimensions: The overall bar code width must be within 20 - 24 bars per inch. Vertical Dimensions: The overall bar code height must be within 0.134” (3.4mm) and 0.23” (5.84mm). Quiet Zone Minimum 0.040” (1.02mm) above and below bar code. Minimum 0.125” (3.18mm) on either side of bar code. Specifications for Human-Readable Information Vertical Position: When human readable information is required, it shall be printed immediately above or below the bar code but outside of the quiet zone. The human readable information shall be at least 0.04” (1.02mm) above or below the bar code but not more than 0.50” (12.7mm) above or below the bar code. No other printing is allowed between the bar code and the human readable information. Horizontal Position: The human readable information, when required, shall be printed so that the left edge of the leftmost digit aligns with the leftmost bar of the Intelligent Mail Bar Code. Content: When human readable information is required, it shall consist of the 20-digit tracking code and the 5-, 9-, or 11-digit routing code, if present. The tracking code shall include a space between each data field. When the bar code contains a routing code, the 5-digit ZIP code, the 4-digit add-on and the remaining 2 digits shall be separated with a space between data fields. 3.3.3: USPS CB4 Bar Code: The Intelligent Mail Bar Code (CB4) is a 4-state bar code that consists of 65 bars. Font Specification: The human readable information, when required, shall be printed using a sans serif font and a minimum 10 to 12 point type size. 3.4 Screen Ruling Screen rulings vary based on imaging method, plate material, and print conditions (such as press width, anilox configuration, and substrate). The range for both conventionally and digitally imaged plates is determined by print and substrate constraints. The graphics and process images to be used should be selected carefully because some print conditions require lower screen rulings. The screen ruling should be specified by the printer and considered by the designer. Table 3.4 provides general line screen guidelines by market segment and substrate category. The designer should consult the prepress and print providers to determine the optimum line screen for a specific design. 85 lpi 110 lpi 150 lpi S. Gilbert 3.4: Screen Ruling: The higher the line screen ruling, the more dots per square inch and the smaller the diameter of each dot. Generally, dot gain increases with higher line screens.
Sustainable Spring 2009