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FLEXO Magazine : July 2009
DESIGN Size Considerations The area reserved for a bar code depends on several interrelated specifications. First, it is important to know what symbol type is specified based on where the product will be scanned. For example, if the product will be scanned at the retail POS (point of sale), an EAN/UPC symbol is typically specified. After the symbol type is known, it is important to know the allowable range of dimensions (height and width) for the symbol, including the human-readable text associated with it. It is important to note that certain symbols have a fixed relationship between their height and width, while others have minimum heights specified. Bar code truncation is a reduction of a symbol’s height below the application standard or symbol specification and is not supported by FIRST. All compliant printers will be able to meet the minimum bar code sizes outlined in the table below. However, the smaller the symbol’s size, the tighter the tolerance on bar width growth; therefore, larger symbols are better. Printing a bar code below the minimum size specified by the bar code application standards is not acceptable. Please consult your product manufacturer, printer/separator for direction. Minimum Bar Code Magnification: General Guidelines Bar Code magnification is print system dependent; determine optimum magnification with print characterization Segment Preprint Linerboard Wide Web Combined Corrugated flute dependent Narrow Web Folding Carton Multiwall Bag Film Products Paper Products Film Products Quiet Zone Considerations The quiet zone is the area, free of printing, that precedes the left bar and follows the right bar in a bar code symbol. The quiet zones allow scanners to detect when a bar code starts and stops. Quiet zones are based on multiples of the symbol’s narrowest element width (X-dimension). Minimum quiet zone specifications depend on the symbol specified. 3.3.2d: Quiet Zones: Quiet zones allow scanners to detect when a bar code starts and stops. Minimum quiet zone specifications depend on the symbol specified and its magnification. Machine Direction 100% UPC: 110% - 200%; ITF-14: 100% 100% 115% 100% 80% 100% Printer Specific Minimum Magnification Machine Direction
Sustainable Spring 2009