Zebra QLn420 User's Guide download pdf (Page 9)

QLn Series User Guide

Printing Technology

The QLn Series printers use the Direct Thermal method to

print human readible text, graphics and barcodes. It incorpo-

rates a sophisticated print engine for optimal printing under all

operational conditions.

Direct Thermal

Direct thermal printing uses heat to cause a chemical reac-

tion on specially treated media. This reaction creates a dark

mark wherever a heated element on the printhead comes in

contact with the media. Since the printing elements are ar-

ranged very densely at 203 d.p.i. (dots per inch) horizontal

and 200 d.p.i. vertical, highly legible characters and graphic

elements may be created a row at a time as the media is ad-

vanced past the printhead. This technology has the advantage

of simplicity, as there is no requirement for consumable sup-

plies such as ink or toner. However, since the media is sensi-

tive to heat, it will gradually loose legibility over long periods

of time, especially if exposed to environments with relatively

high temperatures.

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Zebra QLn420 User's Guide Page 9