158
MARINELLI ET AL .
FIGURE 10 Pictures of the backside of the samples that show observed failure modes: a) coat defect along the crease line; b) coat defect because of the crease tip; and c) no coat defect because of creasing, but grease permeation through the coating.
FIGURE 11
Peel test results for each heat-seal set of temperature, dwell time and pressure: a) average force; b) maximum force; c) seal
energy.
and, equivalently, to peel energies in the sealed area ≥ 450mJ and maximum forces ≥ 18 N. Consequently, it could be stated how the ranges investigated in this work were not correct to spot out a change in H39K 80 behaviour, hence too high set of temperature, time and pressure. Additionally, peel energy values should not be considered meaningful when associated with paperboard delamination. The
might be explained by lower kaolin content that cannot shield native latex stickiness, as previously reported 24 . Similar to previous works 24,33 , two main failure modes were retrieved: a separation along the coat-coat interface, and a crack for- mation in the sealant followed by paperboard delamination (i.e., fibre tear). Indicatively, the latter mode occurred at average forces ≥ 10N —
Made with FlippingBook Online newsletter maker