Here at Warners we are often asked what offset litho printing is. We hope that you enjoy this video and that it all makes sense!
Offset litho printing covers both web and sheetfed printing and differs to digital which you can find in another video. By using aluminium printing plates we are able to print CMYK at high speeds on any paper type. On each printing plate that we use here at Warners there is a special coating. This coating attracts the ink. We prepare the plates and remove the coating from any area we do not want the ink to go. There are 2 plates per colour printing the top and bottom of the sheet. The ink is applied to the plate with water to wash the excess away. The remainder is “offset” on to a rubber blanket which then transfers the ink to the paper. The image on the paper will be made up of tiny dots of the four colours. The coverage is measured in industry set density tolerances. In the case of sheet fed printing additional colours can be added such as pan-tones and spot colours.
Hopefully this has helped to shed some light on the subject of litho printing. We are more than happy to answer any questions you might have about the process and what is best suited to your product needs.
If you are still unsure or would like to know more please don’t hesitate to contact our Helpdesk