Dry offset printing (Dry Offset, Letterset) generally refers to a method of indirect printing on a lithographic printing machine with a letterpress instead of a lithography. It is a printing method composed of embossing and offset printing . It is transferred from the letterpress to the blanket and then transferred to the substrate . Therefore, it can print materials with rough surfaces, as well as metal and plastic films with smooth surfaces.
Since letterpress does not require water, the name of dry offset printing comes from this. The disadvantage of this printing method is that when the dots are less than 40%, satisfactory prints cannot be printed , because the very fine pin dots will penetrate into the blanket and expand the dots of the printed matter. In the world, there are many aluminum cans printed by this printing method.
The rheological properties of dry offset inks are similar to those of offset inks. Since water is not used in the printing process , the water resistance of this ink seems to be lower to a certain extent (of course, this does not mean that water resistance is not necessary).
