shipping labels do not require a printing ribbon. This type of label has a special heat-activated layer where a black print image is formed when heat from the print head is applied. The most common size is 100mm X 150mm (4×6) which is used as a shipping label by online sellers.
Direct thermal Barcode labels are labels printed using heat. The image is applied right onto the label with the printhead in direct thermal printers. When the label travels under the printhead, a chemical reaction takes place with the label media, and only the portions touching the printhead will darken.
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