The tacky wax used can in particular have a tack ranging from 0.7 N.s to 30 N.s, in particular of greater than or equal to 1 N.s, in particular ranging from 1 N.s to 20 N.s, especially of greater than or equal to 2 N.s, in particular ranging from 2 N.s to 10 N.s, and especially ranging from 2 N.s to 5 N.s.