ELECTRIFICATION DUE TO PEELING OF PRESSURE-SENSITIVE ADHESIVE PAPER

Electrification of pressure-sensitive adhesive paper due to peeling was studied by measuring the electric charge and the surface potential with use of toner for electrophotography and a surface potentialmeter, respectively. It was found that the electric charge on the surface of the release-coating after completion of peeling was negative in a sign S near the starting portion from which the release-coating was peeled, while it was positive in a sign E near the end portion. The surface potentials of both the peeled release-coating and the unpeeled face-stock in region E increased with increasing lable-length. The surface potential of the peeled release-coating had a maximum at a peeling rate of about 0.6cm/sec while that of the unpeeled face-stock increased monotonically as the adhesive paper was peeled. These findings suggest that the anomalous electrification should be due to electric polarization induced by peeling.