ABSTRACT
Softening points as measured by the Mettler device are 5-10°C higher than ring-and-ball softening points. Other, subjective methods for the examination of the softening behavior of a coating also have been developed; an example is given next. Pressure-sensitive adhesives are coated in the liquid state. The evaluation of the adhesive starts with the examination of the characteristics of the liquid pressure-sensitive adhesives, generally by testing the flow properties. The properties of the liquid adhesive to be tested include the solids content, the viscosity, the flow properties, and the free monomer content. Wettability of a Release Liner. In the evaluation of the wettability of an adhesive on a release liner care should be taken because of the change of the wettability of the siliconized paper with time. In-line gravimetric measurements of the coating weight can be carried out by inserting siliconized paper or aluminum foils in the laminating station.
