The Offset Litho Process

Offset Litho printing works on the principle that oil and water do not mix. A photographic image is transferred onto a thin metal plate which is treated so that the image area attracts oil based inks while the wet no-image areas resist them. This plate is then passed over rollers of a clean solution or water and then passed over inked rollers so the oil based inks “sticks” to the image area. The image is then transferred onto a rubber blanker which is then transferred onto the papers surface. Each plate prints a separate colour and dependant on the press size they can work in any combination of colours including pantone and metallic inks but mainly work in four colour process (CMYK).

Because of the upfront set up costs of the plates and the presses this makes Off-set Litho printing more beneficial to longer run print projects.

There are many types of Offset Litho printing presses available for example single colour, two colour, four, five, eight and ten colour with different presses being able to print on various sizes of paper from Oversized A3, A2, A1 and upwards.

The Digital Print Process

Similar to your office printer or photocopier. Is very cost effective and is usually used for quick turnaround or short run jobs because the process is very similar to sending a job from your PC to your printer. The quality of digital print has improved dramatically over the last few years and should soon be comparable to litho printing. They are limited to printing in four colour process (Cyan, Magenta, Yellow and Black - CMYK) and therefore cannot use single Pantones or metallic inks.
Other uses are poster printing and large format vinyl printing.

Do you know which printer is the right one for your project?

Do you have time to go through the yellow pages to look for a printer? There are so many different types of printer out there that you could probably call every single one in your area and not necessarily get the right one for your print requirement.

I have worked for many years in various print companies and each is geared up to produce a limited range of products cost effectively and if they couldn’t produce it cost effectively they would broker the job to one that could, put a mark up on that job, and sit back and let someone else do the work.

There are many types of print processes and I will go through these with you over the next few weeks.