Thermal labels are coated with a colorless thermal coating on the surface of ordinary offset labels. Under the action of the heat of the print head, the heat-sensitive parts of the thermal label turn black. The parts that are not sensitive to heat do not change color, thus forming text or barcodes to achieve the purpose of printing. Thermal labels are divided into two types: with a protective layer and without a protective layer. The protective layer is above the thermal layer to protect the thermal layer, resist chemical corrosion, and prevent label contamination (such as sweat on hands, labels for blood banks) blood, etc.) and to protect the print head. The thermal coating can be designed with different activation temperatures as required to meet the needs of printers with different performances.
Thermal transfer labels. Thermal transfer label is a special label specially manufactured for ribbon printing. The ink on the ribbon is transferred to the label sheet under the action of the heat and pressure of the print head of the barcode printer. Therefore, the surface of the thermal transfer label is required to be smooth, non-reflective, and has good ink absorption. Generally, the thermal transfer label has a matte coating, and after reaching the print head, a qualified label is printed under low heat and low pressure. Other types of copperplate labels and matt labels can also be used as thermal transfer labels, but the effect is not good, affecting the life of the print head and the quality of the label.