Ribbon is basically a polyester film which is equipped with a heat-sensitive layer on the one side. Thermal transfer ribbon consists of three layers.
On the central part of the ribbon is a film layer, on one side of which is heat-liquefied ink and on the other side a protective layer. Ink layer is transferred to the label thanks to the heat delivered by the thermal head of the thermal printer.
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According to the characteristics of printing technique, there are flat-head printers and near-edge printers.
Thermal transfer ribbons are classified in three categories: Wax, Wax/Resin and Resin
Wax ribbon:
The ink is made on the basis of wax, it may contain a bit
of resin additive. Wax ribbons are mostly used to print labels made of
uncoated paper. The printed image is characterized by low abrasion
resistance; therefore, the ribbons are dedicated for printing short-term
markings. Wax ribbons are used mainly in places where price is priority
(in retail and logistics, for printing collective packaging labels). It
is the cheapest thermal transfer ribbon.
Wax/resin ribbons:
In
case on this thermal transfer ribbon, the ink is a combination of wax
and resin. The ribbons are used mostly when there is a probability that
the marking will be exposed to higher temperature temperature or
abrasion. The wax/resin ribbon is dedicated mainly for printing labels
made of coated paper and some types of film. Thermal resistance is of
great importance if the product with the labels stuck on is packed into a
plastic sleeve which is then shrink-wrapped. The ribbon is used to mark
products and packaging in transportation and logistics processes.
Resin ribbons:
The
ribbon is dedicated for printing permanent markings mainly in industry
and in places where the printed image is exposed to many factors such as
high temperature and chemical substances. The ink is made on the basis
of resin with the some additives. Sometimes low-quality resin ribbons
contain wax additive. Such procedure certainly speeds up and facilitates
the process of ink transfer onto the label, but it has negative
influence on the resistance of the printed image to solvents and
abrasion. It also influences the price.