GLOSSARY - continued
QUICK TACK (Tack, finger tack, initial adhesion, wet grab) - The property of a pressure sensitive, which allows it to adhere to a surface under very light pressure. It is determined by the ability of the adhesive to quickly wet the surface contacted.
REINFORCEMENTS - A material added to a tape to provide additional strength.
RELEASE COATING (Easy unwind treatment) – A coating applied to the backing on the side opposite the adhesive on unwind and the resulting tape will have little or no ability to stick.
RELEASE COAT TRANSFER - Particles of the release coat sticking to the adhesive on unwind and the resulting the tape will have little or no ability to stick.
RELEASE LINER - A web or sheet of material covering the adhesive side of a tape. It is removed prior to application. Most frequently found on double-coated tapes and label stock.
RIDGING - A mound-like swelling on the outer layers of a roll, lengthwise to the tape. It is removed prior to application. Most frequently found on double-coated tapes and label stock.
SATURATION (Impregnation) – Adding materials (saturant) to the backing for improvement of physical properties, and resistance to various deleterious environments. The backing of paper tapes, for instance, may actually contain as much as 50% by weight of a rubber-based imp regnant.
SILICONE - A unique polymer system which can be a very effective release coating, or pressure sensitive adhesive capable of functioning effectively at extreme temperatures.
SINGLE-FACED - The adhesive is applied to one side of the backing only. Most pressure sensitive tapes are of this type.
SMOOTHNESS - The relative flatness of the tape backing.
STORAGE STABILITY (Roll-aging resistance) – The ability of a tape to retain its original properties after storage.
STRINGINESS - A condition of adhesive in which it feels very soft and mushy, and on close examination relatively long “legs” or “strings’ of adhesive can be pulled out of the adhesive.
TACKY - The condition of the adhesive when it feels sticky or high adhesive. Sometimes used to express the idea of pressure-sensitivity.
TEAR RESISTANCE - The ability of a tape to resist tearing.
TELESCOPING - A sideways sliding of the tape layers, one over the other, such that the roll looks like a funnel or a telescope.
TENSILE STRENGTH (Breaking strength) – The force required to break a piece of tape pulling on opposite ends of the piece.
1) Machine Direction Tensile – Tensile strength measured parallel to the length of the tape. Unless otherwise specified, tensilestrengths are measured in machine direction.
2) Cross Direction Tensile – Tensile strength measured at right angles to the length.
3) Wet Tensile – Tensile strength of tape, which has been kept wet for a specified period of time. Measure ability of tape to function satisfactorily when exposed to moisture.
UNWIND - The force required to remove tape from the roll.
UNWIND ADHESION - The force required to remove tape from the roll.
VOID - A bare uncoated area on either the adhesive or release coated side of the tape.