A stress-controlled rheometer with cone and plate geometry was used to stud
y the rheological properties of four sets of process offset inks and their
emulsions with low water content. All systems have shown typical pseudoplas
tic shear-thinning behaviour. Because of some measuring problems concerning
a remounting of inks from measuring gap, the flow curve was properly segme
nted and the optimal measuring interval DeltaD(opt) was defined. The Ostwal
d flow model was chosen as the best from three applied mathematical models.
Finally, the quantitative how parameters were calculated and discussed in
connection with ink press performance.