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ABRASION RESISTANCE:
The ability of a tape to withstand rubbing and/or scuffing
and still function satisfactorily.
ACLAR FILM:
A chlorofluorocarbon film used in applications requiring clarity
and very low moisture vapor transmission rate. (Registered Trademark
of Allied Chemical Corp.)
ACETATE FILM:
A transparent film produced by chemically treating cellulose.
Provides moisture resistance and aging characteristics superior
to those of cellophane.
ACRYLIC ADHESIVE:
A pressure-sensitive adhesive formed by the polymerization
of acrylic ester monomers, and which generally exhibits excellent
clarity, aging and weathering characteristics.
ADHESION:
A measure of the ability of a pressure-sensitive tape to adhere
to a specified surface under specific conditions of application
and removal. This is usually expressed in the amount of force,
in ounces per inch width, required to remove a piece of tape from
a polished steel surface by pulling it back on itself at a 180
degree angle at the rate of 12" per minute. Adhesion is only
one of the factors determining the sticking qualities of a tape,
other factors are:
Feel: Feel
is the degree of stickiness of the adhesive as determined by
touching it with one's fingers. This is often a misleading test
of effective adhesion.
Finger-Stick:
See "Feel".
Hold: Refers
to the ability of a tape to adhere for long periods of time
to a specific surface while under a specified stress. Hold is
tested by applying a small area of tape to a specific surface
and hanging a weight to the free end of tape. Values are stated
as hours and minutes transpiring between application and failure.
Sometimes hold is tested at0 degree pull-off and sometimes 20
or 90 degree pull-off. Hold values are especially significant
determining suitability of tape for packaging where constant
stress on the tape is in effect.
Peel: The
force required to pull a strip of tape from a surface at a specific
angle and speed. Measured after application under specified
standard condition, and usually expressed in ounces per inch
width.
Quick-Stick:
Refers to the ability to adhere to a specific surface after
a very brief contact at a very low pressure.
Shear Adhesion:
The bond strength of a tape when stressed at a 0 degree angle.
Specific
Adhesion: Refers to ratio of adhesion to a particular surface
as compared with any other surface as a standard.
Tack: Refers
to the sticky feel of the adhesive. Can be measured by rolling
ball method. Expressed as a ratio of height of the drop of a
ball to distance traveled in a horizontal guided track.
ADHESION TO BACKING: Bond produced by the contact between
a pressure-sensitive tape adhesive and the tape backing, when
one piece of tape is applied over another piece. Generally measured
by a Peel Test.
ADHESION TO STEEL TEST: Used to determine the force required
to remove pressure-sensitive tape from a steel panel.
ADHESIVE: The pressure-sensitive layer applied to a tape.
There are a number of adhesive types. The most common is a combination
of rubber and resin-either natural and/or synthetic rubbers are
combined with resins to produce pressure-sensitivity. Other adhesives
are: Acrylic adhesives, which are synthetic polymers that generally
exhibit tack without the addition of resins: and Silicone Adhesives
(Silicone gums and resins), which have the highest service temperature
capability of the common pressure-sensitive adhesives as well
as excellent aging and weathering characteristics.
ADHESIVE DEPOSIT: Adhesive that is pulled away from the
tape and remains on the surface after the tape is removed.
ADHESIVE SPLITTING: Occurs when a part of the adhesive
remains as a layer on the surface from which the tape was removed.
See "Anchorage".
ADHESIVE TRANSFER: Adhesive deposited from its normal position
on the tape to the surface to which the tape was in contact. Can
occur, either during unwind or removal.
AGING: Controlled temperature and humidity conditioning
to provide a guide to any deterioration of the finished product
that may be attributed to aging.
AMBIENT TEMPERTAURE: Normal fluctuating temperatures in
an environment where the conditions are not closely controlled-e.g.
in a typical warehouse, boxcar, office building, etc.
ANCHORAGE: Refers to the degree of adhesion the adhesive
has for the backing on which it is carried. Insufficient anchorage
results in complete transfer of the adhesive to another surface
when the tape is removed. This is distinct from splitting, where
only a layer of adhesive is transferred. See "Adhesive Splitting".
ANTIOXIDANT: A chemical added to an adhesive that protects
it from oxygen deterioration during aging, thus extending the
usable life of the tape.
ASTM: The American Society for Testing and Materials-an
independent body which establishes testing methods and standards.
