The band at 967 cm1 presents a CeH deformation
bending mode of the butadiene binders’ double bonds,
which decrease with UV irradiation of the pigment
prints. The band area of uncured print is the highest and decreases due to UV irradiation, which is shown
graphically in Fig. 5 and numerically in Table 7. ATRFTIR
measurements show (Table 7) that the number of
passes has an influence on the efficiency of UV-curing.
The minimum 967 cm1 bands area was achieved, in
general, at 4e6 passes of UV lamp, although there were
some unexpected exceptions. It is evident that the
number of UV-lamp crossings has the greatest influence
in the case of B1 samples, where 2 passes of UV lamp
cause a dramatic decrease of band area, irrespective of
7.5 g kg1, 15 gkg1 or 30 g kg1 of C.I. Pigment Red
146 was added to the printing paste. The amounts of
photoinitiator (60 g kg1) as butadieneeacrylonitrile
copolymer binder (100 g kg1) were equal in the printing
pastes of B1 samples. The possible explanation could be
that the higher amounts of binder (150 and 200 g kg1)
slow down the photopolymerization process.