Glossary of Terms for
Paper and Printing
"O"
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OCR (Optical Character Recognition)
Paper that is specially made for reading machines, having a tight specification on brightness, opacity and smoothness.
OFF-MACHINE
Indicates an operation that is not performed on the paper machine, but as a separate operation (i.e. in off-machine paper coating).
OFFCUT
Paper of usable size obtained as a by-product when larger sheets or reels are cut down to the size of the order.
OFFSET
An indirect printing process, usually referring to offset lithography. The term offset comes from the fact that ink is transferred to paper from a blanket that carries an impression from the printing plate.
OFFSET
The most commonly used printing method, whereby the printed material does not receive the ink directly from the printing plate but from an intermediary cylinder called a blanket that receives the ink from the plate and transfers it to the paper.
OFFSET LITHO
See Lithographic or Offset.
OFFSET PAPER
An uncoated sheet specially suited for offset printing.
OPACITY
Property of paper that minimises the "show-through" of printing from the back side or the next sheet. A paper with low opacity is more transparent.
OUT-OF-SQUARE
Paper trimmed improperly so the corners are not true 90 degrees. This will result in difficulty when the presser does not have a good guide edge to work from for accurate register.
OVERS
Additional copies run to the amount specified.
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