Experimental evaluation of the decohesion process of adhesive joints on polymer films
Polimery 2000, No 11-12, 802
SummaryAcrylic adhesive/PE film joints were prepared by using PE films preactivated by corona discharges. The tear-off work, a measure of strength of the joint, is the sum of several terms; the major terms include the work of adhesion and the work of deformation (here: stretching of film) involved in the tear-off process. The tear-off work (Po, Fig. 5) and the stretching work (Pr, Fig. 6) were determined for films that varied from 50 to 150 µm in thickness, in relation to specific treatment energies (Ej) ranging up to 7.5 kJ/m2. Within the interval 0 < Ej < 3 kJ/m2, Pr rises in an approximately linear way. As Ej is increased, evaluation of the unit adhesion work from tear-off tests becomes more and more burdened with error. Within the range of Ej adopted in technical preparation of upper layers of PE films (Ej = 2 kJ/m2), the error is kept within 9% and is only slightly related to film thickness.