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REGISTRATION MARKS
Symbols attached to original copy prior to photography,
used for positioning films in register, or registering two or more
colors when printing.
RELEASE/RELEASING
1) The act of freeing or separating a pressure sensitive
label from its liner.
2) The force required to free or separate a pressure sensitive label
from its liner.
RELEASE COAT
The (silicone) coating on a liner that allows pressure
sensitive labels to be easily removed or dispensed.
RELEASE COAT TRANSFER
A defect resulting from the transfer of the release
coat from the liner, to the pressure sensitive adhesive during release.
RELEASE LINER
The component of the pressure sensitive label material
which functions as a carrier for the pressure sensitive label. Usually
silicone coated, it readily separates from the label when the label
is removed for application.
REMOVABILITY
A relative term applied to pressure sensitive labels
to describe the force or condition under which they can be removed
from a substrate. A removable label would be one in which little
or no damage occurs to the substrate or the label upon removal.
REMOVABLE ADHESIVE
A pressure sensitive adhesive characterized by low
ultimate adhesion and clean removability from a wide variety of
surfaces.
REPEAT
The printing length of a plate cylinder, determined
by one revolution of the plate cylinder gear.
RESIDENCE TIME
The time during which a pressure sensitive material
remains on a surface before testing for adhesive permanence or removability.
RESOLUTION
Measured in dpi (dots per inch), typical capabilities
are 200 dpi for a thermal transfer printer and 300 dpi for a laser
printer. It is particularly critical in barcode printing.
REWIND
After printing the roll, it is wound up to the original
unprinted form.
ROLL LABELS
Pressure sensitive labels that are packaged in continuous
roll form.
ROLL-TO-ROLL
A method of running materials through a printing
machine. A roll or material is fed into a printing unit, is printed,
then is rewound into a roll as it exits the machine.
ROLL-TO-SHEET
A method of running materials through a printing
machine. A roll or material is fed into a printing unit, is printed,
then is sheeted as it exits the printing machine.
RUBBER-BASE ADHESIVES
Pressure sensitive adhesive based on natural or synthetic rubber.
Can be coated as a solvent, hot melt or emulsion system.
RUNNING REGISTER
The control on a flexographic press which accurately
positions, while in the run mode, the printing of each color station
in the direction of web travel. Also called circumferential register
or longitudinal register.
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