code is an array of vertical parallel lines in two colors.
Lines have different width and the combination of these lines
gives a different message (the country of origin, producer,
etc.). The combination of the lines also depends of the standard
that is used (EAN-13, EAN-8, UPCE, INTERLEAVE 2-5 etc.).
For its electromechanically characteristics
bar code printers have big differences compared to standard
computer printers. Their basic use is printing bar codes on
self-adhesive labels, with or without prepress. There are
Direct Thermal (DT) and Thermal Transfer (TT) technology.
DT printing heated head of printer leaves black tray directly
on thermal sensitive paper. The advantages of this print
technology are: quality print but short life, caused by
the sensitivity of thermal paper to light.
choice depends of material, used in TT technology, give quality
print and long life, and in cases resistance to mechanical
and chemical reactions.
print technology is the best bar code print technology.
picture right the difference in “coverness” in different
print techniques is obvious what gives the conclusion that
printer resolution is not decisive. TT technology gives
the most quality print which is necessary for detection
with bar code printers.