Bar code printer is a special kind of printer. The biggest difference between bar code printer and ordinary printer is that the printing of bar code printer is based on heat, and carbon tape is used as printing medium (or thermal paper is directly used). The biggest advantage of this printing method compared with ordinary printing method is that it can realize unsupervised continuous high-speed printing. It generally prints brand logo, serial number logo, packaging logo, barcode logo, envelope label, clothing tag and so on.