GLOSSARY - continued
KRAFT - A sulfate wood pulp paper. (See SATURATION)
LAMINATION - A combination of two or more similar or dissimilar materials which function as one backing, e.g. acetate and tissue in acetate fiber tapes.
MIGRATION - The movement, over a long period of time, of an ingredient from one component to another when the two are in surface contact. May occur between a tape and the surface to which it is applied. Some plastic films and foams contain plasticizers which are apt to migrate into the tape adhesive, causing the adhesives to soften.
MULTIPLE COMPONENTS ADHESIVE - A pressure sensitive adhesive containing one or more elastomers, combined with resins and other components which impart tack, - adhesion and other necessary properties.
OFF-CORE - Layers of tape are incorrect alignment, but tape is displaced sideways on core.
OFFSETING - Occurs when a printed tape is unwound and some of the printing ink is picked off by the adhesive or migrates into the adhesive. It is effect a delaminating of the ink.
ONE COMPONENT ADHESIVE - A pressure sensitive adhesive in which all of the necessary properties are derived from a single uniquely designed synthetic polymer.
OOZING - A “squeezing out” of the adhesive from under the backing. The edges of the roll become tacky.
PEEL ADHESION - The force required to break the bond between a tape and the surface to which it is applied. Usually measured by peeling back the tape at 180 degrees or sometimes at 90 degrees in the case of certain backings, and expressed in ounces per inch width.
PINHOLE - A very small hole which may permit the passage of light, moisture or electrical current.
PRESURE SENSITIVE - A term commonly used to designate a distinct category of adhesive tapes and adhesives which in dry (solvent free) form are aggressively and permanently tacky at room temperature and firmly adhere to a variety of dissimilar surfaces upon mere contact without the need of more than finger or hand pressure. They require no activation by water, solvent or heat in order to exert a strong adhesive holding force toward such materials as paper, plastic, glass, wood, cement and metals. They require no activation by water, solvent or heat in order to exert a strong adhesive holding force toward such materials as paper, plastic, glass, wood, cement and metals. They have a sufficiently cohesive holding and elastic nature so that, despite their aggressive tackiness, they can be handled with the fingers and removed from smooth surfaces without leaving a residue. General trade usage by leading tape manufactures does not sanction extension of the term “pressure sensitive” to embrace tapes and adhesives merely because they are sticky (e.g. fly-papers), or merely because they adhere or cohere.
PRESURE SENSITIVE TAPE - A combination of pressure sensitive adhesive with a backing.
PRIMING (TIE COAT) - Coating the backing on the adhesive side with a thin layer of adhesive-like material which serves as a bonding agent and the backing.
PRINTABILITY - The ability of a tape to accept and hold a printed legend, and especially to resist offset of printing when rewound into a roll after printing.