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Knowledge / Mistakes / Perforations

Punch Mistake: printers term for a deviation caused by a punch mistake

Shifted Perforation: deviation from the intended perforation position

Misperforated Postage Stamp: shifted perforation split on multible postage stamps

Sheet Turn-Over: paper sheet turned over before perforation

Blind Perforation: perforation with not fully punched holes

Partly Blind Perforation: perforation with not fully punched holes at one or more, but not at all four, sides

Missing Perforation: postage stamp without perforation at all sides caused by a mistake

Partly Missing Perforation: postage stamp with missing perforation at one or more, but not at all four, sides caused by a mistake

Missing Perforation Hole: perforation with a missing hole caused by a broken perforation pin

Pair With Missing Perforation in Between: pair with missing perforation in between caused by a mistake

Block of 4 With Missing Perforation in Between: sheet part with missing perforation in between caused by a mistake

Oblique Perforation: postage stamp with perforation shifted out of alignment

Oblique Perforation: postage stamp with perforation shifted out of alignment

Inverted Perforation: sheet with 180 degrees rotated perforation

Double Perforation: postage stamp twice perforated at all sides

Partly Double Perforation: postage stamp twice perforated at one or more, but not at all four, sides

Rough Perforation: imperfect perforation with paper rest in the holes

Irregular Perforation: perforation with holes not in a line

Perforation Size Error: postage stamp with a different number of perforation elements at all four sides caused by a mistake

Partly Perforation Size Error: postage stamp with a different number of perforation elements at one or more, but not at all four, sides caused by a mistake

Perforation Size Difference: deviation from the intended size of a perforation

Level Out Tooth: from the standard deviate tooth to avoid misperforated postage stamps

Straggering Perforation: perforation with uneven space between the holes

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