Paper factsGeneric MICR Fundamentals Guide 3-7• If you are using micro-perforations, be sure to have more than60 ties to the inch.• Make sure that the perforation line is rolled sufficiently toeliminate the underside bulge (debossment). Otherwise,feeding and stacking may be unreliable and print deletionsmay occur.• When paper is perforated, a ridge or dimple forms around theholes. Make sure that the design and placement of theperforation does not cause document edge irregularities.• Do not use puncture-type perforations that are not ironedsmooth. They prevent the stack from lying flat, which cancause feeding problems and deletions. Use rolledperforations instead.• Make sure that the perforation design and placement do notcause document edge irregularities.• Make sure that die-cut perforated papers are free of paperdust and chaff.• Avoid printing any text or forms data within 1/8 inch/3.2 mm ofany perforation.• For printers that use edge registration: Full-length perforationthat is parallel to the registration edge should not be closerthan 1.5 inches/37.5 mm to that edge.Metallic contentPaper stock materials for MICR applications cannot containferromagnetic particles.StiffnessStiffness refers to the rigidity or bending resistance of the paper.Thicker papers are usually stiffer. In general, 16 pound/60 gsmand lighter papers are not as stiff as heavier stocks. They maybunch up or wrinkle in the printer, causing jams and misfeeds.Heavier papers, such as cover and index stock, may jam morefrequently and have more print quality defects (skips, blurs, anddeletions) due to their reduced ability to bend.24 pound/90 gsm paper usually provides stiffness levels in therange needed by the Xerox MICR laser printer and the proofing,reader sorter, and remittance-processing systems used inbanking environments.
