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Tape Glossary | P-Q

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PENETRATION RESISTANCE: A tape's ability to withstand high pressure on a small area for a long time without puncturing.
PERMEABILITY: The ease with which a liquid or a gas can pass through a tape or a film.
PHENOLIC RESIN: A family of resins which are derived from phenol and frequently are used as curing agents in adhesives to impart high temperature resistance and hold.
PIN HOLE: A very small defect in the mass or backing which may permit the passage of light or electricity.
PIGTAILING: The spiraling of a tape when unwound due to uneven stresses in the backing.
PLASTICITY: See "Cold Flow".
PLASTICIZER: A liquid or semi-liquid incorporated in a material to increase its flexibility and workability. Generally used in reference to flexible film backings.
PLASTICIZER MIGRATION: This term is usually associated with the use of tape on plastic sheets, films, and forms. Specific plasticizers used in producing plastic sheeting or forms pass from the plastic into the pressure-sensitive adhesive of the applied tape. The result is a softening of the adhesive to point of adhesion failure and a slight embrittlement of the adjoining plastic. See "Migration".
POLYBUTADIENE: A polymeric material generally soft and rubbery, very tough and elastic; made from butadiene monomer.
POLYESTER: A tough, strong film with good moisture, solvent, oil and temperature resistance.
POLYETHYLENE: A polyolefin plastic which can be extruded into a low tensile film with good moisture barrier properties but with the limited temperature resistance.
POLYIMIDE: A polymer which, in film form, is amber-colored and with physical properties similar to polyester but with much higher temperature resistance. See "Kapton".
POLYISOPRENE: A polymeric synthetic rubber material made from isoprene monomer, with properties similar to natural rubber.
POLYMER: A large molecular chain made up of repeating monomer units.
POLYMERIZATION: The process of chemically linking monomer molecules to form a long chain polymer.
POLYPROPYLENE: A polyolefin plastic similar in properties to polyethylene, nut with higher temperature capability and greater strength.
POLYURETHANE: A tough abrasion-resistant polymer which can be extruded into film as well as other forms.
POLYTETREFLUOROETHYLENE: A fluorinated plastic characterized by high temperature resistance and an inherent release surface. A skived film is made by shaving a billet of material with a sharp broad knife to produce a continuous web.
POLYVINYLCHLORIDE/PVC: A synthetic plastic used extensively as tape backing, either with a large amount of plasticizer added to make it flexible and stretchy (plastic electrical tape), or as unplasticized rigid film. See "UPVC".
POLYVINYLFLUORIDE: A fluorine containing film, characterized by good flame resistance, excellent weathering resistance and good electric properties.
POLYVINYLACETATE: A plastic used frequently as a coating for paper or as adhesive for laminating webs.
PRESSURE-SENSITIVE: Adhesive materials which stick by application of pressure alone and do not require activation by heat or solvent. Bets-known example: pressure-sensitive tape.
PRIMER: This is a preliminary coating applied to a backing to enable the adhesive to adhere to the backing.
PRINT COATER UNIT: A unit consisting of a two roll gravure printing unit and a gas fired vertical high-velocity air drying oven.
PRINTABILITY: The ability of a tape to accept ink and not destroy the printed legend when unwound.
PUCKERS: Distortions in web materials associated primarily with laminated constructions or interlined produced. Puckers appear as ripples on the surface and often exhibit separation of the two laminated components. Puckers generally run in the cross machine direction.
QUICK-STICK: See "Adhesion".

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