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RAZOR BLADE SLITTER: A slitting machine that slices the
tape backing with razor blades. This imparts a very smooth, and
therefore strong, edge that is difficult to tear by hand. Film
tapes are often slit by this method.
RELATIVE HUMIDITY: The amount of moisture present in the
atmosphere as a percentage of the maximum quantity of moisture
that the air can hold at that temperature.
REINFORCE: A material, such as glass yarn, laminated to
a tape backing to provide additional tensile strength and tear
resistance.
RELEASE COATING: Release Coating and Backsize are sometimes
used interchangeably. The term Release Coating usually refers
to a very thin coating which is applied to the backside of a film
or other impervious tape backing and which allows the tape to
be unwound at a controlled level.
RELEASE LINER: A backing coated on one or both sides with
a controlled amount of release agent. It is frequently used with
label stocks or double-face tapes.
RESIN: A material, usually a polymer, which imparts tackiness
and pressure-sensitive adhesion to a rubber/resin adhesive.
RESISTIVITY: The specific resistance of a material. The
electrical resistance offered by a section of material of standard
dimensions.
REVERSE ROLL COATER: The most adaptable web coating method;
capable of coating a variety of flexible substrates with a wide
range of adhesive and solutions.
REWIND MACHINE: A unit or units which rewind sub-standard
individual rolls of finished tape and salvage good portions, making
usable and salable rolls.
REWOUND: Refers to a roll of tape that has been enrolled
to remove defects.
ROLL DEFORMATION: This is a general term to describe any
physical departure from the shape and proportions of a perfect
roll of tape, i.e. differences in diameter, openings between layers
in the roll and displacement of layers axially with relation to
each other.
Note examples defined below:
- Buckling: That type or Roll Deformation wherein bumps
appear along the circumference of the roll.
- Fluting: A term sometimes used to indicate "Gearing"
or "Smoking".
- Gearing: That type of Roll Deformation wherein a regular
succession of humps appears along the circumference of the roll.
The regularity of the spacing from hump to hump gives the appearance
of a gear.
- Roll Opening: (Also called Gapping) That type of Roll
Deformation wherein any two layers become separated from each
other so as to create an opening.
- Spoking: That type of Roll Deformation which results
in the appearance of lines radiating from the center of a roll
to the circumference. Its resemblance to a spoked wheel is marked.
Telescoping: That type of Roll Deformation wherein successive
layers of tape slide across each other in the same axial direction.
The movement is similar to the lengthening of a telescope.
ROLL HARDNESS: A value which reflects proper winding of
individual rolls of tape. The value is measured by an instrument
which measures the relative hardness of wind.
ROPE PAPER: A paper formerly composed of reclaimed rope
fibers. The decreasing used of hemp rope has created a shortage
of used rope, and virgin hemp fiber is being used.
RUBBER: A long chain polymer, synthetic or natural, that
has the properties of elasticity, resilience, and recovery.
