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PEEL ADHESION
The force required to remove a pressure sensitive
label from a standard test surface at a specified angle and speed,
after the label has been applied according to specified conditions.
PENETRATION
The change in appearance of the face material due
to movement of one or more components from the adhesive or substrate.
PERFORATION
A series of small incisions made in a material to
facilitate tearing or folding along a pre-determined line. They
are measured in TPIs (ties per inch).
PERMANENCY
The measure of an adhesive's ultimate holding power
or bonding strength. A bond that makes label removal difficult or
impossible without distorting or destroying the face material.
PERMANENT ADHESIVE
An adhesive characterized by having relatively high
ultimate adhesion to a wide variety of surfaces.
PHOTOPOLYMER
Plate material that is photosensitive and upon exposure,
its compounds polymerize to form a tough, abrasion-resistant surface
that becomes the inking media.
PIGGYBACK
A type of pressure sensitive label on a pressure
sensitive liner. The double-ply label is carried on a standard release
liner. Once the double-ply is applied to a substrate, the top ply
can be removed and applied to yet another substrate.
PIN-FED HOLES
Round or rectangular holes punched into the edge
of a liner to maintain the register of computer imprintable pressure
sensitive labels during imprinting. Holes can be clearly cut or
in a starburst.
PINHOLING
Unwanted holes in the printed areas.
PLASTICIZER
A substance added to polymeric materials to promote
flexibility, workability, and elongation.
PLASTICIZER MIGRATION
The movement of plasticizers from a plastic into
an adhesive, face material, or both. This can cause degradation
of the adhesive and bleed-through of adhesive components into the
face material.
PLATE
The image carrier in letterpress and flexographic
printing.
POLYESTER
A strong film that is resistant to moisture, solvents,
oils, and chemicals. It is usually transparent, but is available
with a metalized finish.
POLYETHYLENE
A tough, stretchy film suitable for use in low temperature
applications. It is frequently used for labeling semi-rigid bottles.
POLYMER
A compound formed by the reaction of simple molecules
called monomers, having functional groups that permit their combination
to proceed to high molecular weights under suitable conditions.
A long-chain molecular structure.
POLYPROPYLENE
Similar to polyethylene but stronger and having
a higher temperature resistance. Various thermoplastics are polymers
of propylene; this material has excellent clarity. Also used in
various thicknesses to print labels, as well as backing or liner
materials.
POLYSTYRENE
A thermoplastic produced by the polymerization of
styrene. The electrical insulating properties are outstanding, and
the material is relatively unaffected by moisture.
POSITIVE
Corresponds with the original artwork in all aspects.
PRESS PROOFS
Checking of the printed product before the production
run is made.
PRESSURE SENSITIVE LABEL
A self-adhesive label that is the usable part of
pressure sensitive material.
PRESSURE SENSITIVE MATERIAL/PRESSURE
SENSITIVE STOCK
The combination of face material, pressure sensitive
adhesive and release liner from which pressure sensitive labels
are manufactured. Colloquially referred to as a "sandwich."
PRESSURE SENSITIVE TAPE
A combination of a pressure sensitive adhesive with
a carrier. Tapes are either self-wound, or use release liners or
films.
PRICE MARK LABELS
Labels for retail and/or wholesale use that normally
carry alpha or numeric character information such as: unit price,
lot number, style number, and SKU number.
PRIME LABEL/PRIMARY LABEL
Usually a descriptive, decorative product label;
the label is typically on the front of the container.
PRIMER
A coating applied to face material, on the side
opposite the printing surface, to improve anchorage of the adhesive
and to prevent migration of adhesive components into face material.
PRINT RESOLUTION
The quality of print; the level of detail achieved
by a printer. Measured in dpi (dots per inch), typical capabilities
are 200 dpi for a thermal transfer printer and 300 dpi for a laser
printer. It is particularly critical in barcode printing.
PROCESS COLORS
Colors that are created by mixing halftones of the four process
colors (cyan, magenta, yellow and black).
PROTECTIVE COATING
A coating that protects the printing and surface
of a pressure sensitive labels from abrasion, sunlight, chemicals,
or moisture.
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