Offset printing is a flat printing process. Here, the ink-receiving areas are etched out of a flat metal printing plate. The amount of ink transferred is measured in lines/cm for all printing processes. In offset printing (up to 100 lines/cm), more lines/cm can be printed on the substrate than in flexo printing (18 to 54 lines/cm). The higher the number of lines, the clearer the printed image when viewed up close. As an indirect flat printing process, it is based on the physical principle of grease-water repulsion. The printing and non-printing areas are almost on the same level. Offset printing uses highly viscous inks.
These inks are transferred to the paper by the so-called printing forme cylinder (unreversed) and the blanket cylinder (reversed). Offset printing inks are paste-like inks that dry through oxidation. In printing, we speak of standard colours (CMYK) and special colours. The special colours can be printed in offset from the different colour systems such as Pantone, RAL or HKS (for example brand logos) precisely and true to colour. The standard colours are screened in offset printing. Since the pixels are printed next to and on top of each other, a very fine screening is created. This creates a mixed colour for the viewer, so that a wide colour spectrum is possible. We create visual and haptic experiences by refining offset printing.
We often use varnishes for high-gloss and matt effects or Iriodin varnish for pearlescent effects. Blind and foil embossing gently emphasise graphic or text elements in offset printing. Offset print finishes can also be applied for quality reasons. An aqueous coating, for example, supports faster drying and helps to increase rub resistance. Offset printing can be enhanced with anti-slip varnish. Lamination (cellophaning) also protects the offset print image from mechanical impact.