Types Of Drying In Offset Printing

drying hot air in offset

One problem with offset printing is that the ink is usually not sufficiently dry after printing, and therefore direct further processing/finishing of printed sheets is not possible.

In offset printing a sufficiently dry sheet that can be further processed is only achieved through special additional drying units integral to the machine. Hot-air and infrared drying are state-of-the-art; in particular, UV drying, in conjunction with special inks, makes it possible for the sheet to be dry when it arrives in the delivery or to be directly further-processed in line.

unit for hot air drying

In sheet-fed offset insufficient drying is often compensated for by the application of powder in the delivery section so that undesirable quality-reducing ink set off in the pile is prevented, and furthermore rather quicker finishing is possible . Powdering is an additional operation bound up with costs, and it leads to certain areas of the press getting dirty, and therefore to extra cleaning work and possibly also quality-reducing effects (e.g., in print jobs with coating, or through the generally gloss-reducing effect of fine powder particles). A particular challenge facing ink manufacturers is the development of new ink systems to bring about speedier drying.

unit for hot drying

A number of proposals are under discussion, for example the development of water-based, quick-drying offset inks. The development of new drying equipment and drying processes is likewise just as great a challenge for the supply industry as it is for printing press manufacturers.