Лако-красочные материалы — производство

The peel resistance of a PSA is an important property which is determined in terms of the force needed to peel back an adhesive tape from a solid surface at a defined rate in a defined peel angle. The peel resistance depends on the adhesion of the adhesive to the surface, the viscoelastic behavior of the adhesive and the support material, the peel rate, and the temperature.

The peel force-peel rate curve can be divided into three segments. At very low peel rates, the failure mode is cohesive within the adhesive. However, when the peel rate is increased the peel failure mode changes from cohesive failure within the adhesive to adhesion failure. This abrupt change occurs with an initial decrease in peel force, but the latter increases with increasing peel rate. The third segment of the curve shows decreasing peel force with increasing peel rate. This region of the peel force-peel rate curve is associated with a glassy response of the adhesive, and a ‘shocky’ peel occurs where the adhesive is not uniformly peeled from the surface but rather starts to tear off periodically (the ‘slip-stick effect’).