You shouldn´t confuse a direct thermal label with a thermal transfer label. Although the names are similar, they use different processes to transfer images to paper. Thermal transfer uses a hot print-head to transfer ink from a ribbon to the paper; the direct thermal process uses a hot print-head to directly form an image to heat-sensitive paper. With a direct thermal label, there is no ribbon involved.
Here´s how it works. Direct thermal labels are coated with a heat-sensitive chemical, which darkens wherever a print-head heated to over 185 degrees Fahrenheit touches it. Different types of direct thermal labels use different chemical processes to produce an image; there are even some that contain microscopic packages of ink that burst when heat is applied, leaving a dark spot where one is needed. Whatever method is used, the result is a simple black-and-white image. At the moment, color labels aren´t an option with the direct thermal process.
One of the benefits of a typical direct thermal label is the fact that the image is permanent: there is no way to remove it, short of destroying the label. That makes direct thermal labels ideal for barcodes, compliance labeling, asset control, inventory, and shelving. Our direct thermal labels come in a wide range of varieties, from basic paper to durable synthetics, which are resistant to chemicals, moisture, and abrasion. One thing that a direct thermal label can´t handle, however, is too much heat, since this would cause the label itself to darken, obscuring your image.
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