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Tape Glossary | C

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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.

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