When the direct thermal paper passes over the thermal print head, the heated portions react chemically and produce the desired image. Because the paper has been chemically treated to change color when heated. It is user-friendly, cost-effective, and ecologically beneficial because it does not need ink, toner, or printer ribbons. They are frequently used for labels that are only required for a limited period of time.

The direct thermal printing technique produces printed labels that are most effective for short-term uses. Depending on the kind of label material and the application environment, they have very limited lifespans (usually six to nine months). Due to the heat sensitivity of the label materials, prolonged exposure to heat and ultraviolet (UV) light will eventually cause the printed image to fade.

Direct thermal labels are used for short- to medium-term labeling purposes in numerous industries, including food service, retail, medicines, and transportation. Receipts, shipping labels, name tags, barcodes, and passes are all examples of direct thermal labels. As direct thermal printing technology advances, it is anticipated to be used in a broader range of industrial applications.