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LABEL STOCK: Pressure-sensitive tape, which is suitable
for printing and die-cutting, for use as labels. It is frequently
furnished in roil form with a release inter-liner.
LAMINATED: A laminated tape is one whose backing is composed
of two or more different materials laminated or glued together
by an adhesive. For instance, a film with threads laminated to
it or a film and a paper laminated. Strapping tape is a common
example of a laminated tape.
LAP SPLICE: A splice made by overlapping the ends.
LATEX: A water dispersion of a rubber. Used to saturate
paper backing; may also be used as a primer.
LATHE CUTTER: A machine used to cut tape by rotating a
large tape roll and slicing individual rolls to the desired width
with a rotating or fixed knife.
LIFTING: Refers to that condition in which tape releases
or comes away from, on its own accord, the surface to which it
has been applied. See "Flagging",
see "Edge
Curling".
LINER: A web or sheet affixed to the adhesive for protection
during handling and storage. It is removed and discharged before
application. Most frequently found on double face tapes and label
stocks.
LOG ROLL: A roll on which a predetermined length of tape
is wound in wide widths instead of in narrow roll sizes.
MANDREL: A part of the slitting machine assembly on which
cores are fitted and on which the individual rolls of tape are
wound.
MASS: Mass is the adhesive substance which gives a pressure-sensitive
tape its adhesive properties. It is the adhesive.
- Exudation: See "Cold
Flow".
- Pick-Off: See "Backsize".
- Weight: The amount of dry adhesive that is left on
the substrate of backing. Amount is controlled on coaters by
AccuRay or hand samples weighed on torsion balances. Generally
described in terms of ounces per square yard.
MAT: A web of fibers.
MATTE FINISH: A dull, non-reflective, irregular surface
of a tape backing.
MEK (METHYL ETHYL KETONE): An oxygenated solvent which
will dissolve certain types of vinyl resins and nitrile rubbers.
MELINEX FILM: See "Polyester".
METALLIZED POLYSTER (or OTHER FILM): A polyester film upon
which a thin layer of metal has been deposited.
METERING ROLL: Operating part of the reverse roll coating
head that serves to create a nip or aperture which then regulates
the amount of adhesive to be applied by the casting roll.
METHYLYENE CHLORIDE: A strong cleaning solvent often used
in the capacitor industry.
MIGRATION: The slow movement of an ingredient from one
part of a tape into another part, or between a tape and the surface
to which the tape has been applied. Some plastic films and foams,
for example, contain plasticizers which migrate into the adhesive
and soften it. See "Plasticizer
Migration".
MODULUS: A measurement that defines the stress/strain characteristics
of a material; usually expressed as the force in pounds per square
inch required to cause a certain elongation. Also used to refer
to the slope of the stress-strain curve.
MOISTURE RESISTANCE: The resistance of a tape to the passage
or the absorption of moisture, or to the harmful affects of moisture.
MOISTURE VAPOR TRANSMISSION RATE: See "Water
Vapor Transmission Rate".
MOLECULAR WEIGHT: A measure of the size of an organic molecule
polymer.
MONOMER: The basic building block from which a polymer
chain is made. Many monomer molecules are chemically joined together
to make up the polymer.
MYLAR FILM: See "Polyester".
