Anhydrous offset is a type of offset printing, in which the printing form is not wetted with a wetting agent. Special printing forms (for example silicone moulds) and special inks with high surface tension are used for anhydrous printing. The anhydrous offset eliminates the problems that occur in the classical offset due to the contact of wetting solution with printing ink (emulsification of paint, loss of gloss of metallic paints) and with the substrate (moisturisation of the printing substrate).
Calling offset mold
It also allows to apply paint thicker than in the classic offset (i. e. over 3.5 µm) due to the use of a special printing form (analogue to rotogravure printing). However, printing costs and technological problems make offset printing a relatively small niche space (e. g. printing of non-absorbent surfaces).
Calling offset mold is the process of removing the copying layer from the places of non-printing molds by dissolving them in a suitable developer. The call can be made manually or automatically using the imager.
History of offset – perspective of printing house form Poland
The history of offset had its humble beginnings at the end of the 18th century with the invention of a new printing technique: lithography. Alois Senefelder (1771-1834), a German inventor of lithography, was the son of the actor of the Royal Theatre. His father wanted Alois to complete his studies in law. After the death of his parents, Alois stopped his studies and moved his steps towards the theatre in order to become independent. He did not gain a favorable opinion as an actor, but theatrical scripts he began to write found a wider audience. He published several of his works, but the printing costs were so high that the sales profits were poor.
In order to speed up the publication of one of his works, he often visited the printing house. He found that printing is so simple that he can do it himself – he acquired copper plates for this purpose, which he began to engrave. It was a time-consuming and difficult job, which had to be done in such a way that the image on the disc was a mirror reflection of the intended effect. In order to practice an untrained hand, he acquired polished calcareous plates.
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