Procedures
for subjecting pressure sensitive label stock to special environmental
conditions in order to predict the course of natural ageing.
ADHESION
/ ADHERENCE
A
bond produced between a pressure sensitive adhesive and a surface.
ADHESION/PEEL
ADHESION/ADHESION STRENGTH
Peel
adhesion is the force per unit width required to remove a pressure sensitive
label from a standard test panel at a specified angle and speed after the label
has been applied to the test panel under specified conditions. (Pressure Sensitive Tape Council).
ADHESION,
SHEAR/HOLDING-POWER
The
time required, under specified test conditions, to slide a standard area of
pressure sensitive label from a standard flat surface in a direction parallel
to the surface.
ADHESION,
SPECIFIC
The
force required to remove a pressure sensitive adhesive from a specific substrate
under specified conditions.
ULTIMATE
ADHESION/ADHESION BUILD-UP
The
mature bond established under standardised laboratory conditions between a
tacky surface of a pressure sensitive label and a substrate.
It is measured in the same manner as peel adhesion.
ADHESIVE
BLEED/OOZE
Adhesive
exudation for pressure sensitive label stock and labels as a result of cold
flow.
ADHESIVE,
COLD TEMPERATURE
An
adhesive that will enable a pressure sensitive label to adhere or stick well
when applied to a substrate at low temperature.
ADHESIVE,
HIGH TEMPERATURE
An
adhesive that will enable a pressure sensitive label to adhere or stick well
when applied to a hot substrate.
ADHESIVE,
PERMANENT
An
adhesive characterised by having relatively high ultimate adhesion.
ADHESIVE,
PRESSURE SENSITIVE
A
type of adhesive which in dry (solvent free) form is aggressively and
permanently tacky at room temperature and firmly adheres to a variety of
dissimilar surfaces upon mere contact, without the need of more than finger or
hand pressure.
ADHESIVE,
REMOVABLE
A
pressure sensitive adhesive characterised by relatively high cohesive strength
and low ultimate adhesion.
AGEING
The
changes undergone by a material with the passage of time.
ANCHORAGE
The
specific adhesion of a pressure sensitive adhesive to a face material or an
anchor coat.
CURLING
/LIFTING
The
spontaneous lifting of the edges of a pressure sensitive label from a surface
CALIPER/THICKNESS
The
thickness (as of a sheet of paper) measured under specified conditions.
It is usually expressed in millimetre
or in mils.
CHEMICAL
RESISTANCE
The
resistance of a pressure sensitive label to the deteriorating effects resulting
from exposure to chemicals under specified conditions.
COHESIVE
STRENGTH
The
internal strength of the adhesive.
COLD
FLOW/OOZE
The
viscous flow of a pressure sensitive adhesive under stress.
COLOUR
FASTNESS/COLOUR PERMANENCE/COLOUR STABILITY
That
property of a pressure sensitive label to retain its colour in normal storage
or to resist change in colour when exposed to light, heat or other deleterious
influences.
CONFORMABILITY
The
ability of a pressure sensitive label to yield to the contours of a surface
(curved or rough)
CROSS
DIRECTION
The
direction at right angles to the machine direction in the plane of a sheet of
paper.
CURL
The
tendency of paper by itself or in a laminate to bend or partly wrap around the
axis of one of its directions.
DELAMINATION
The
separation of a material into layers in a direction approximately parallel to
the surface.
DIE
Any
of various tools or devices used for imparting or cutting a desired shape form
or finish to or from a material.
DIE-CUT
ELONGATION
The
increase in length of a material produced by extending it to the point of
rupture.
EMBOSSED
A
term applied to the face material of pressure sensitive labels that has
printing or a design in raised relief.
FACE
MATERIAL/BACKING
MATERIAL
Any
paper, film, fabric, laminated or foils material suitable for converting into
pressure sensitive label stock.
FISH
EYES
Round
or eye-shaped deformations in a coating (adhesive, release, protective, etc.)
FLEXOGRAPHIC
PRINTING
Formerly
called aniline printing. A method
of rotary letterpress printing that employs flexible rubber plates and
rapid-drying inks.
GLOSS
That
property of a surface, which causes it to reflect light specularly.
HEAT
RESISTANCE
The
property of a material, which inhibits the occurrence of physical or chemical
changes, caused by exposure to high temperatures.
LABEL
A
slip of any material that can be affixed to anything, and indicating ownership,
contents, directions, destination, rating etc.
LABEL,
FACE-CUT
A
die-cut label product from which the matrix has not been removed.
LABEL,
FAN FOLDED
Pressure
sensitive labels that are in a continuous form but are fan folded rather than
rolled.
LABEL,
LAID-OUT/DIE-CUT
LABEL
Die-cut;
pressure sensitive labels mounted on a release liner from which the matrix has
been removed.
SELF
ADHESIVE LABEL
A
pressure sensitive (self adhesive) label product is a die-cut part that has
been converted through roll fed production equipment utilising the type of
pressure sensitive (self adhesive) material which has a protective backing.
The end product is produced in the form of either rolls, sheets,
fan-fold, or by other techniques that produce like products, which have been
slit or cut from the converted roll.
LABEL,
PUNCHED-OUT
A
pressure sensitive label, which has been die-cut through all components of the
label, stock.
LABEL,
ROLL
Pressure
sensitive labels that are packaged in a continuous roll form.
LABEL,
SHEET
Pressure
sensitive labels that are packaged in sheets.
LABEL
STOCK, PRESSURE SENSITIVE /SELF
ADHESIVE LABEL STOCK
The
combination of face material, pressure sensitive adhesive and release liner
from which pressure sensitive labels are manufactured.
LABEL, TAMPERPROOF/DESTRUCTIBLE LABEL/NON-REMOVABLE LABEL
A
class of pressure sensitive labels that cannot be removed from a substrate
without damaging them in some manner, thus making their reuse impossible.
LABEL,
TRANSPARENT
A
pressure sensitive label whose face material, adhesive and protective coatings
transmit light so that objects can be seen through it.
LINER,
RELEASE /BACKING
LINER/ RELEASE LINING
The
component of the pressure sensitive label stock which functions as a carrier
for the pressure sensitive label. Prior
to application, it protects the adhesive, and readily separates from the label
immediately before the label is applied to its substrate.
MATRIX
/WASTE
The
pressure sensitive face material surrounding a pressure sensitive label, which
is usually removed after die-cutting, thereby leaving laid-on labels on the
release liner.
MATT
FINISH
A
dull finish
MOISTURE
CONTENT
The
moisture present in a material, as determined by specified methods.
MOISTUREPROOF
The
property of a material which makes it substantially impervious to water vapour.
NATURAL
AGEING
The
change in a material is occurring when it is exposed to normal environmental
conditions.
WRITE-ON
MATERIAL
Receptivity
of a face material to marking by pencil.
PERFORATED
Refers
to a series of small incisions made in laid-on labels and/or their release
liner to facilitate tearing along a predetermined line.
PROTECTIVE
COATING/OVERCOAT/OVERPRINT COATING
A
coating that protects the printing and the surface of a pressure sensitive
label from either abrasion, sunlight, chemicals (their fumes and dilute
solutions) and moisture, or a combination of these.
(lamination with clear Mylar).
REGISTERED
The
exact, corresponding placement of successively printed images and/or
successively die-cut pressure sensitive labels.
RELEASE
COAT/RELEASE LACQUER
The
release liner treatment material that allows pressure sensitive labels to
release from the liner.
SHELF
LIFE/STORAGE
LIFE
The
period of time during which a product can be stored under specified conditions
and still remain suitable for use.
SCREEN
PRINTING
A
method of printing in which the ink is forced through a design on a taut
screen, made of bolting cloth, on to the object to be printed.
SMUDGE
RESISTANCE
The
resistance of a freshly printed paper surface to ink blurring or smearing.
SOLVENT
RESISTANCE
The
resistance of a pressure sensitive label to the dissolving action of specific
organic liquids.
SPLIT/SLIT
To
divide by cutting.
SPLIT
BACK/BACK SCORE
Slits
in the release liner to facilitate its removal by hand.
STIFFNESS
The
property of a body which resists bending.
SUBSTRATE/ADHERENT
The
surface to which a pressure sensitive label is adhered.
TACK/QUICK
STICK
That
property of a pressure sensitive label which causes it to adhere to a surface
instantly without external pressure for better contact.
TRANSFER
TAPE
A
pressure sensitive adhesive (unsupported or reinforced) applied to a two-side
release coated liner.
WEATHERABILITY
The
capability of a pressure sensitive label to withstand the effects of weather.
YELLOWING
Defect
manifested by a gradual colour change in the original appearance of a pressure
sensitive label characterised by the development of yellowish and brownish hues.
