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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.

IPS -
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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