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CALENDAR: A machine equipped with pressure rollers to
make thin plastic webs, or to apply adhesive and coatings to substrates
such as cloth.
CALENDAR COATER: A solventless type of coating machine
used primarily for the application of adhesives to cloth and heavy
substrates of tape.
CALIPER: A measurement of the thickness. Expressed in one-thousandths
of a an inch (English units) of millimeters (Metric units).
CAMERON SLITTER: A type of machine used to cut film, papers
and a wide variety of substrates.
CASTING ROLL: Operating part or the reverse roll coating
head that "casts" or applies adhesives to backing.
CELLULOSE: The naturally occurring basic chemical building
block which makes up paper fiber.
CHLOROPRENE: A chlorinated monomer used in the manufacture
of Neoprene rubber.
COATED CLOTH: Fabric that is given a rubber or plastic
back coating to increase moisture resistance and promote longer
wear.
COATER: A machine composed of ovens, rollers, spreading
devices, carriage bars, unwind stand and windup stand used in
applying adhesive to the tape backing.
COATER HEAD: An assembly of rollers (metering, casting
and back up roll) plus measuring and adjusting equipment, used
to apply adhesive to the tape backing.
COATING: Application of a solution to various types of
materials or backings such as paper, cloth, vinyl, cellulose film
and metal foils. Accomplished by using reverse roll coating, air
doctor, doctor roll and knife coating equipment. Via this process,
raw backing is converted into pressure-sensitive tape.
COHESION STRENGTH: The internal strength of the adhesive
and its ability to resist internal stresses that are, in turn,
caused by external forces. For example, adhesive splitting upon
tape removal indicates the force on the adhesive has exceeded
the internal strength of the adhesive.
COLD FLOW: The extremely slow flow or minute movement of
a semi-solid substance when subjected to a stress. Pressure-sensitivity
implies cold flow. It accounts for increase of adhesion as application
time or pressure increases. It also relates to oozing or exudation
of adhesion from the edges of the roll and adhesive transfer.
Some of the terms used in describing effects of cold flow follow:
Firm: Refers to the resistance of an adhesive to flow
or distortion. It is the opposite of soft.
Mass Exudation: Refers to that condition where the sides
of a roll become sticky due to mass exudation or flowing out
from between the layers of tape.
Oozing: The same as mass exudation. The result is sticky
or tacky sides when it occurs in a roll of tape.
Plasticity: A measure of resistance to flow or deformation
used in describing the physical properties of semi-liquids and
solids. The higher the plasticity, the higher the firmness.
COLOR: The visual color impression of a tape viewed from
the backing side, irrespective of the color of its adhesive or
other components.
COLOR STABILITY: Ability of the tape to retain its original
color, especially when tape is exposed to light.
COMPRESSION SET: Permanent deformation of rubber or a plastic
as a result of pressure.
CONDUCTIVITY, SURFACE: The ability of a tape to carry an
electrical current along its surface. The opposite of "Insulation
Resistance".
CONFORMABILITY: Ability of a tape to fit snugly or make
total contact with the surface or an irregular-shaped object without
creasing or folding.
CONTAMINANT: An impurity, usually in trace amount, which
sometimes renders a product unfit for a specified use.
CORROSION: The electrolytic or chemical deterioration of
a surface to which applied. See "Electrolytic Corrosion factor".
CREEP: Small, slow, dimensional changes caused by continuing
stress. Examples are the slight retraction of tape edges after
applying tape in a stretched condition, and loosening of heavy
taped bundles due to slow stretching of the tape.
CREPE PAPER: Generally a kraft paper which has been treated
(creped) to impart such desirable features as conformability and
flexibility, with good tensile strength.
CROSS-LINK: A chemical bridge formed between molecular
chains, increasing their strength and heat resistance. The curing
of an adhesive to increase its temperature and shear resistance.
CURING: See "Heat
Curing".
CURLING: Refers to a situation in which the free end of
tape curls back upon itself when the roll is unwound.
CUT-THROUGH RESISTANCE: The ability of tape to withstand
cutting by a wire lead or the sharp edge of a package or part.
