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DEAD STRETCH: Stretching and not recovering or striking
back to former length. This is particularly important in crepe
paper masking tapes, where it is not desirable to have the tape
spring back or recover after stretching around a curve. The ability
to stretch around a curve is achieved by creping the backing or
by a specific impregnation.
DEFECT: A condition which fails to meet a tape's design
requirements.
DELAMINATION: The tearing apart or splitting of a tape
within the backing layer, in laminated tapes, the separation of
the layers upon unwinding. In the case of paper tapes the de-lamination
occurs within the paper, while in laminated tapes the de-lamination
occurs at the laminated surface between the two layers.
DENSITY: The amount of material in a unit volume.
DICER: A type of machine used to cut rubber compounds into
fine particle size prior to making them into an adhesive.
DIELECTRIC STRENGTH: The voltage expressed in volts or
in volts per mil that a tape will withstand without breaking down
and passing current through it.
DIP IMPREGNATION: The process of saturating a web (usually
paper) by immersing it in a latex or solution to unify and bond
the fibers together.
DIRECT COATING: Application of a solution directly to the
web to be coated by the engraved roll of a print roll coating
unit.
DISPERSION: Fine particles distributed in a matrix of some
other substance. An example: the dispersion of a color pigment
in an oil, clay, etc.
DOCTOR BAR OR BLADE: A scraper mechanism that regulates
the amount of adhesive on the spreader rolls of a coater.
DOCTOR ROLL: Roller mechanism used to regulate the adhesive
applied to the spreader roll of Reverse Roll coater - it revolves
at a different surface speed, or in an opposite direction, that
results in a wiping action.
DOUBLE-FACE TAPE: An adhesive tape coated on both sides
of its backing (which served as a carrier for the adhesive) and
interlined with a released liner.
