IEC is one of the best Turkish Printing comppanies in Turkey.
General informationa bout Printing types:
• screen printing, we could explain this process as which employs a stencil principle. A rubber it used
to push ink through the stencil on to the substrate;
• Ink-jet printing, in which a computer-controlled stream of ink drops
Is projected at high speed onto the substrate;
• toner printing systems such as electrophotographic printing, in wouldl
light is used selectively to discharge an electrostatic field, thus
forming an electrostatic latent image. The image is 'developed' using
toner of appropriate electrical charge, which is then transferred to the
substrate and fused by heat or other means.
There are other minor processes such as intaglio or recess printing and
collotype which are rarely used except for special purposes.
2.9 PRINT RECOGNITION
It is not always possible to make a positive identification of the
printing process used since flu* appearance characteristics of some
processes are rather similar. However, in most cases the following
features, examined under a magnifying glass, will provide a good guide:
• the edges of type characters;
• the appearance of halftone dots and solids;
• presence of embossment on either the top or reverse side of a printed
• the ink film thickness.
The kind of stock on which the print is made can modify its appearance
considerably but may also be a due to the printing process used. Also,
some processes have particular areas of application and are more likely
to be used for certain kinds of work. Table 2.1 shows the main
character¬istics of the most common printing processes.
The main characteristics of a lithographic print are the uniform ink
coverage and the absence of squash, There is no rim of ink around a
type* character, and even on rough paper, non-bottoming does not occur
since the rubber blanket' conform# well to the paper surface. Halftone
dots are of the saine shape and pattern as letterpress dots, but the ink
coverage is uniform and the smallest dots are smaller than is possible
with flexo or letterpress, The edges of dots are fably well defined on
smooth coated stocks, but have rather fuzzy edges on uneoated stocks, so
the dot pattern is less distinct, Ink film thickness is around 2 pm,
There are two defects sped lie to offset lithography which assist in
identification if they happen to be present on a print. The first is
scum Which occurs when Ihe non image areas of a plate start to accept
ink for some reason, Scum appear, under magnification ü randomly
distributed fine spoH of ink. A snpcf fi* ially similar fault is that of
tinting winch occurs when the ink heroines eniul'.illed in the water.
When this oe< urs, a thin wavh of rftlffttrnjtpearl over the whole print
which under high magnifi/ afton ' an be fern to be made up of minute
droplets of ink