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Glossary
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Laser-perfs. Small perforations (20 to 30 perfs per inch) that create little paper dust and debris and
do not normally cause nesting. Also known as micro-perfs or data-perfs.
Leading edge. The edge of the print material that enters the printer paper path first.
Matrix. Unneeded portions of die-cut stock around labels. A stripped matrix is one that is removed to
make it easier to peel labels from the liner.
Micro-perfs. See Laser-perfs.
Moisture content. The amount of moisture in the paper, which affects both print quality and paper
feeding. Leave paper in its original wrapper until you are ready to use it. This limits the exposure of
the paper to moisture changes that can damage the paper.
Nesting. To fit compactly together; to interlock; to stick together.
Offset powder. A powder applied during some printing processes to help dry inks.
Oil bleed. Migration of materials from the substrate or the adhesive out to the face. This generally
occurs in aged materials or materials exposed to extreme temperature changes. Also known as
penetration, bleed through, and bleed.
Ooze. Migration of adhesive away from labels, which can cause printer contamination.
Perforation. Line of very small holes or slots punched to facilitate tearing. See also Laser-perfs.
Pick. The mechanical action the printer performs to remove one sheet of material from the tray.
Pick roller. The roller that assists in picking a sheet of material from the tray.
Pull strength. See Release.
Release. The ability of adhesive to resist label peeling during the printing process.
Roll-over. Bending of the paper edge during conversion due to a dull cutting knife.
Rollback. The lifting of labels from the backing during the printing process. Also known as
butterflying.
Semi-liquid. Having characteristics of both liquid and solid.
Shear strength. Cohesive strength of the adhesive.
Shelf talkers. Small signs that hang over or next to a regular shelf label. Shelf talkers may be
constructed of a pressure sensitive material or card stock.
Sizing. Additives applied to paper (internally or externally) that improve offset printing qualities and
resistance to liquids.