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A to C

Abrasion -
The wearing away of any material by rubbing against another surface.

Absorption -
The amount of liquid absorbed in a specific time under standard conditions.

Acrylic-based adhesive -
Pressure sensitive adhesive based with acrylic polymers.

Adhesive -
A tacky substance capable of holding two materials together when placed in between.

Adhesive coating weight -
The amount of adhesive applied to a certain area. Measured in grams / sq. meters.

Basis weight -
The weight of 500 sheets of a particular paper (25" x 36").

Back coat -
A coating on the back of the paper to provide protection against various agents. Prevents curling and bleed-through to the front. It allows adhesives and inks to be applied to the back.

Background density -
The measurement of the white background of the paper by the degree of light reflected from the surface. Measured by a reflectance meter (%).

Brightness -
The degree of light reflected from the surface. Measured by a reflectance meter.

Bar code symbol -
An array of parallel, rectangular bars and spaces that together represent a single data element or character in a particular symbology.

Blocking -
When permanent adhesion has taken place and the paper can not be separated without chemical or fiber tear.

Bursting strength -
The constant rate of pressure required to rupture the paper. Measured in lbs. per sq. inch.

Calendar -
A process were the paper is squeezed between metal cylinders to compact the paper fibers. This makes the paper smoother and gives it some gloss.

Caliper -
The thickness of a sheet paper, in thousandths of an inch (mils or microns).

Cross direction -
The opposite direction of the grain of the paper; width of the roll.

Coefficient of friction -
The ratio of frictional force resisting movement between the surface tested and the applied force.

Color (L, a, b) -
The measurement of white paper based on the color scale (L, a, b). "L" represents the lightness on a scale of 0 for black and 100 for perfect white, "a" represents positive for redness and negative for green and "b" represents positive for yellow, negative for blue and zero for gray.

Curl -
The degree of curvature measured when paper is positioned flat.

D to K

Demand printer -
A printer that creates individual labels tags or tickets one at a time, as directed.

Densitometer -
A photoelectric instrument that measures reflected light from a surface. It is used to control the density of the activated image and background.

Dye stain -
A test using a blue/green dye to evaluate the consistency of the silicone coating.

Dynamic sensitivity -
A test of thermal imaging using variable pulse lengths and temperatures. Measured in ODU.

Emulsion -
The process were the face paper is adhered to the liner by the use of adhesive.

Gloss -
The shininess or luster of the paper surface. Measured with a gloss meter.

High-speed printer -
A computer that prints in excess of 300 lines per minute.

Image density -
The unit of measure for the thermal image strength. Measured in ODU (optical density unit).

Infrared -
The band of wavelengths greater than visible light but shorter than microwave. Scanners operating with this light source are usually specified around 900 nanometers.

Inches Per Second as it pertains to print speed.

Julian date -
A method of dating in which the days of the year are numbered sequentially from 001 to 365, or during leap year, to 366, with January 1 being represented as 001.

L to R

Laminated -
The process of adhering one or more layers of material (face to liner) to a desired thickness.

Liner (backing) -
The silicone coated paper that functions as the carrier for the pressure sensitive material, protecting the adhesive prior to application.

Logo -
A company or product mark lightly inked on the back of the face.

Machine direction -
The direction of the paper grain, length of the roll.

Moisture content -
The amount of moisture found in a sheet of paper. Average amount ranges from 5 to 8%.

Opacity -
The amount of light measured that can travel through the paper.

Opaque -
The amount of light measured that can not travel through the paper. The more opaque a sheet of paper is, the less transparent.

Plasticizers -
Plastic or ink additives which improves compatibility of components and/or improves flexibility, workability of the finished product. Known to migrate and fade away a thermal image.

Pressure sensitive adhesive -
Tacky adhesive applied to sheet material which allows adhesion of the material to the substrate by contact and light pressure.

Polymer -
A compound formed by the linking of simple and identical molecules having functional groups that permit their combination to proceed to higher molecular weights under suitable conditions.

Print contrast signal PCS) -
A comparison between the reflectance of the bars and that of spaces. Under a given set of illumination conditions, PCS is defined as: PCS = (RL-RD)/RL Where RD is the reflectance factor of the dark bars and RL is the reflectance factor of the light spaces, or background.

Release value -
Force required to remove the face from the liner under a specified angle and speed after the material is applied under controlled conditions. Measured in grams / 2 inch (TLMI).

Resin -
A thermoplastic substance.

Resistances (water, oils, heat, plasticizer) -
Quality of a sheet of paper to resist a certain element under certain conditions.

S to Z

Silicone -
A formulation based with silica polymers.

Smoothness -
The flatness and evenness of the paper's surface. Measured in seconds.

Slitter -
Equipment with a sharp disk which cuts paper into pre-determined widths.

Splice -
An overlapping joint (tape) used to join the ends of the webs together.

Stiffness -
The Property of paper that resist bending.

Silicone coating weight -
The amount of silicone applied to a certain area. Measured in grams / sq. meters.

Static sensitivity -
A test of thermal imaging using variable temperatures with a fixed time. Measured in ODU.

Tack -
Surface "stickiness" of a pressure sensitive adhesive. The ability of the adhesive to adhere.

Tearing strength -
The ability of a paper to resist tearing when subjected to a force perpendicular to the surface in both directions (CD & MD). Measured in grams.

Tensile strength -
The ability of a paper to resist breaking under stress and strain conditions in both directions (CD & MD). Measured in lbs. per inch.

Thermo-sensitive layer -
A liquid formulation that contains sentisizers and dyes for thermal imaging. The composition of this layer determines sensitivity, preservability, image density and background density.

Thickness (Caliper) -
The measurement of the paper in thousandths of an inch or (mils & microns).

Tappi -
Technical Association of Pulp and Paper Industry.

Top coat -
The top coat ensures sufficient protection of the thermal image against various types of environmental contamination. It also provides a reliable matching with the printer and protects the thermal head.

Transmittance -
The ratio of radiant energy transmitted to the total radiant energy on a given material. Measured with a spectrophotometer.

Under coat -
The under layer reflects print head energy back to the thermal layer. It also determines the properties of sensitivity, brightness and image density.

Waviness -
Characteristic of a pile of sheets when the outer edges retain more moisture from the air than the center does or when the center retains more moisture then the outer edges. It is a form of paper curl.

Web -
The roll of paper or ribbon used in rotary equipment (Coater or Press) in one continuous form.

Web break -
The break of a roll of paper or ribbon during manufacturing.

Wrinkles -
Creases or folds in the paper or ribbon.

Yellowing -
Describes a transformation inherent to all paper fibers caused by aging. A few hours in direct sunlight is enough to yellow paper.

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