 |
  |
|
|||||||||
|
|||||||||||
|
|||||||||||
|
|||||||||||
|
|
Glossary
|
|||||||||||||||||||||||||||||||||||
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.
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.
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.
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. |
|
|
|||||||||||||||||||||||||||||||||||
 | Privacy | Terms of Use | Copyright 2004-2009, Ricoh Electronics, Inc. |
