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GAPPING: Same as "Roll
Opening" listed under "Roll
Deformation".
GAUGE: See "Caliper".
GEARING: See "Roll
Deformation".
GHOSTING: A haze-like deposit of an adhesive component
left by a tape after its removal.
GLOSS: FINISH: A highly reflective or lustrous tape backing.
GOVERNMENT SPECIFICATION: A Government document that spells
out the requirements for a particular tape or group of tapes.
It will normally detail the physical properties, performance,
performance characteristics, general composition, sampling requirements
and packing.
GRAVURE COATER: (also known as Print Coater.) This coater
applies a specific amount of coating by etched or gravure rolls
to a substrate. It is used for Back-sizing, Priming, Saturating
solutions.
HAND: The relative suppleness of a textile, film or tape.
HEAT CURING: The application of heat to a tape to bring
about a chemical reaction forming cross-links, thereby increasing
the cohesive strength of the adhesive and its resistance to high
temperature and to attack by solvents.
HEAT RESISTANCE: See "Bake
Resistance".
HIGHLIGHTING: A phenomenon where the surface covered by
a tape shows a visual contrast with the surrounding area after
removal of a tape, even though there is no staining, ghosting,
imprinting or mass transfer. Sometimes caused by a change in surface
gloss, sometimes by a difference in thickness of the finish under
the tape, and sometimes by the protection from fading or yellowing
furnished by the tape while it was applied.
HIGH-SPEED UNWIND ADHESION: The force required to unwind
a roll of tape at relatively fast speeds, usually over 50 feet
per minute (fpm).
HOLD: See "Adhesion".
HOLD TO BOXBOARD: The ability of tape when applied to boxboard
to resist slippage when subjected to a shear stress by means of
a specified weight.
HOLD TO CHROME: The ability of tape to resist slippage
when applied to a chrome-plated bar and subjected to a shear stress
by means of a specified weight. Usually hung at 20 or 0 degrees
angle with a 400 gram weight.
HOLDING POWER: The ability of a tape to resist slippage
under shear stress. Holding power is measured by applying a standard
area of tape to a vertical test panel and suspending a standard
weight on the free end of the tape, i.e., holds to chrome, holds
to boxboard, etc.
HOMOGENIZER: A machine used to disperse or dissolve materials
under high speed and high shear.
HYDROCARBON: A molecule consisting only of carbon and hydrogen.
Many hydrocarbons are used as solvents, and originate from petroleum.
HYDROLYSIS: A chemical reaction with water, resulting in
decomposition.
HYGROSCOPIC: Capable of readily absorbing and retaining
moisture.
