Print Barcode Labels with Thermal Transfer Technology
Thermal transfer technology to print barcode labels is a process that melts a coating of ribbon onto a receptive label material. A thermal transfer printing head uses small resistors that are selectively heated or cooled. The heated elements come into contact with the ribbon (see diagram above) and the ink is melted onto the product label material, where it dries instantly.
Thermal transfer printing is a digital process in that no printing plates are used and that it can print some types of variable data, such as preprinted barcode labels, depending on the software used. Print quality, however, is not as high as that of other digital printing technologies.
For Custom Barcode Labels, Why Is It Used?
While we would never suggest using this printing process as a replacement for versioning, there are situations in which it is useful to overprint professionally printed labels with a thermal transfer printer, sometimes for custom barcode labels. Anyone considering using this printing process will need to invest substantial time researching and testing. For instance, some of our nutraceutical customers use thermal printers to overprint lot numbers or batch dates on their product labels, i.e., adding extra data unavailable at the time of original printing. This may not be achievable using any other method. For example, a laser printer could potentially melt the labels.
Anyone considering using thermal printing to overprint professionally printed labels must ensure that the thermal printer they purchase is compatible with the processes and materials used by their commercial print shop, including label core size, roll width, and laminate. It is also critical to test the label materials you wish to use with a thermal printer prior to placing an order. We here at Lightning Labels would be happy to provide you with label samples for this purpose and to advise how to print barcode labels that work best for your products.