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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. See "Teflon".
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".
