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Two Different Technologies of thermal printing

2015-06-26 09:00:00 REMEETE TECHNOLOGY CO., LIMITED Read
Two Different Technologies of thermal printing
 
The field of thermal printing actually comprises two related but different technologies. Direct thermal printing, used on low-end fax machines, for example, uses specially treated paper that darkens when heated by the printhead. Thermal transfer printers, on the other hand, use a coated ribbon to transfer the image to a wide range of printing materials including plain paper.
 
The heart of both devices is in the thermal printhead, which provides the energy necessary to form the image. The "line-type" printhead (as opposed to moving or "serial-type" printhead) does not require a scanning mechanism, resulting in a very simple and inexpensive device. Yet because print element position is fixed normal to the web motion direction, excellent print accuracy can be achieved. The relative location of print element spacing on thermal printheads is often held to tolerances as small as 0.0001 inch.
 
To create an image, a processor determines the individual resistive printhead elements that will be selectively heated as the media is moved past the printhead. The image is built from a matrix of individual dots by alternating the movement of the media and selective heating on the dots.
 
In direct thermal printing, the image is produced when the dye in the coating of the paper is activated by heat. This eliminates the need for a ribbon.
 
In thermal transfer printing, on the other hand, heat is supplied by the printhead to a thermal transfer ribbon that has a media such as paper under the inked side of the ribbon. The heat supplied by the printhead melts the wax or resin that contains the ink, allowing it to transfer to the receiving media, where it cools and becomes solidified.
 
Besides, in order to increase the sales, improve the service quality, mobile thermal printers are more and more used in retail stores, restaurants, services, etc.
 
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