The letterpress printing is used for self-adhesive labels. The printing plate is photosensitive resin letterpress. The printed labels have the advantage of full ink color, but now the grades of letterpress printing equipment are quite different. Some are still using circular embossing presses, and some are ordinary Some rotary embossing machines have adopted professional oblique-back, satellite-type or unit-type adhesive label printers, so they cannot be generalized during the transformation. Professional self-adhesive printers, mainly embossing, have the ability to print film labels, but they need to contact the supplier to replace some related parts, such as adding a tension control system controlled by a servo motor, adding a film surface treatment unit, and high-end Some machines can also add a precise registration system.
Gravure printing uses a short ink path inking system to supply ink, web printing, with a high degree of automation, using solvent-based inks, the ink layer dries quickly, and is the first choice for film printing. Generally, the speed of gravure printing presses is relatively high, and the back end of many gravure printing presses is also equipped with a cylinder die cutting device, which can perform die cutting and indentation, and is suitable for printing various labels. However, due to the long cycle of gravure plate-making and the high cost of plate-making, it is only suitable for mass label production.