Color Label Press University "Glossary of Terms" Part Seventeen, Course One

Color Label Press University "Glossary for Pressure Sensitive Labels"  Course One (Sponsored by Muratec a Konica Minolta Company)

Piping
Also known as tunneling, a condition occurring in an incompletely bonded laminate characterized by release of longitudinal portions of the substrate and delamination of these portions to form these pipelike structures. The material fails to adhere to release paper or film tightly enough and a line of air forms between them. Usually starts at one edge and works across web.
Pitch Diameter The measure of a gear or cylinder, determined by diving the circumference by Pi (3.1416).
Plasticizer    A substance added to materials to impart softness, flexibility, workability, elongation and dispensability.
Plasticizer Migration   The migration of liquid plasticizers from some plastics into an adhesive and/or face material. Often causes excessive softening or degradation of adhesives.
Plasticizer Resistance   Plasticizers can migrate into adhesives and/or inks and cause a breakdown, resulting in loss of adhesion to the substrate. If
the adhesive or ink is formulated to resist the plasticizer, the breakdown may not occur.
Plate    The image carrier in letterpress and flexographic printing.
Plate Cylinder   There are two types of plate cylinders; the integral, with the shaft a permanent part of the body and the de-mountable, in which the shaft is removable to receive a multiplicity of bodies of varying diameters, and in some cases face widths. These plate rolls are undercut in their diameter so as to accommodate various thicknesses of mounting tape and plate materials.
Platen Press   Printing press in which a flat surface bearing the paper is pressed against a flat surface bearing the inked type. PLIABILITY
See flexibility.
Ply    Each layer in a multi-layered structure.
Point   Printer's unit of measurement to designate type size. There are 12 points to a pica; approximately 72 points to an inch. Also, a term used for an expression of thickness of a sheet of material in one-thousands of an inch increments, I.e. 7 point = .007" thick.
Poise    The unit of viscosity, expressed as one dyne per second per square centimeter.

Polar Solvent    Solvents with oxygen in their molecule, I.e. alcohols, water, esters, etc.
Polarity    Refers to the relative surface charge of the material, resulting from the molecular structure of the adherent surface.
Polycarbonate    A high clarity film having the versatality of acetate with the durability of polyester.
Polyester   A strong film having good resistance to moisture, solvents, oils, etc., usually transparent, although available with opaque
and metalized finish. A clear complex ester formed by polymerization or condensation. Excellent strength, clarity and dimensionally stable.
Polyester Liner   A polyester film that is silicone release coated. It provides an excellent die-cutting surface and is also used on overlaminating films to provide a smooth, glass-like surface of adhesive.
Polyester Metalized Film    A clear polyester film, vacuum metalized on one side to provide a metallic look.
Polyester Overlam    A clear, glossy polyester film coated with clear acrylic adhesive. Can also be supplied with a matte surface.
Polyethylene   A tough, stretchy plastic film having very good low temperature characteristics. Also used a great deal for producing semirigid
recyclable 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.

Polymerization    A chemical reaction initiated by a catalyst, haet or light, in which monomers and/or oligomers combine to form a polymer.
Polypropylene   Similar to polyethylene but stronger and having a higher temperature resistance. Various thermoplastic plastics are
polymers of propylene; excellent clarity. Also used in various thicknesses in the printing of labels as well as backing or liner materials.
Polystyrene   A thermoplastic produced by the polymerization of styrene. The electrical insulating properties are outstandingly good and
the material is relatively unaffected by moisture.
Polyvinyl    Refers to a group of resins formed by polymerizing various vinyl monomers.
Polyvinylidene Chloride    A usually very thin transparent film with excellent resistance to acids, water and organic solvents. Saran.
Poor Trapping   Condition in wet printing that results when less ink transfers to previously printed ink than to unprinted paper. Also called under-trapping.
POP Point of Purchase.    The location at which a product is sold, the store or retail counter.
POP Display    The displays or merchandising units used at the point of purchase.
Porosity    The property of paper that governs the degree of permeability, I.e., the passage of a substance through it.
Post Cure   The continuation of a polymerization (curing) process within a UV ink or coating, after exposure to UV radiation has been
terminated.
Pot Life    The time period during which an adhesive or coating remains effective and workable.
PP    Polypropylene.
Pre-Separated Art   Artwork in which the basic layout, register marks and major color is prepared on illustration board and each additional color plate is drawn on a separate sheet or film overlay.
Press   In-Line Press with the printing units in-line.
Press Proofs   Printed sections of substrate material made on a press to allow for approval or final corrections before the production
printing run is made.

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