The code printer is a non-contact inkjet marking system controlled by a single chip microcomputer. For example, a ribbon printer, a solid ink wheel printer, a stamp printer, and the like. Applicable to the date of manufacture, batch number, expiration date, weight, price, size, etc, widely used in PT, PE, KT, OPP, CPP, aluminum foil, plastic bags, various plastic composite film and paper, over-plastic paper , leather, bags, plastic products, etc.