VERFAHREN ZUM VERBINDEN DER ZUGESCHNITTENEN KANTEN PHOTOPOLYMERISIERTER FLEXODRUCKFORMEN.

摘要

In bonding the cut edges of photopolymerisable flexoprinting plates which have relief layers and dimensionally stable support films, onto a printing cylinder, by (a) filling the nip between the edges with a photo-polymerisable mixt. of binder, compatible photopolymerisable monomers and initiators for the photopolymerisation, and (b) polymerising the mixt. under a fixed, transparent coating, by irradiation with UV light, the novelty is that (a1) before stage (a) the plates are fixed by a double-sided adhesive film (1) of the same surface as the plates, onto adjusting cylinders and are cut to suit the printing cylinder, after which they are removed from the adjusting cylinder and the film (1), and are fixed onto the printing cylinders by a double-sided adhesive film (2) of the same surface as the printing plates and thickness 1.6-2.6 x that of film (1), and (b1) in stage (b) the mixt. is only partially polymerised until the relation: Rs is less than R(s/f) which is less than Rf is satisfied. R8 = Elongation at break of the partially polymerised compsn. filling the nip; R(s/f) = elongation at break in the interface between the compsn. filling the nip and the material of the printing plate: Rf = elongation at break of the material of the printing plate.