Some Key Things You Should Know About Offset Printing
January 8, 2010 by Milagros Tan
Filed under Business
Most organizations require a printing service on a regular basis, whether it is for promotional purposes or intra-company communication. Hence it is helpful to know about the basic working of the frequently used printing process called offset printing.
Offset printing is so well known among printing service providers and clients because for large volumes, it turns out to be cheaper than alternative methods. Hence for bulk orders any good printing company would recommend you to go for offset printing.
The ink used during offset printing has oil as the medium and is insoluble in water. Its so called because in this method, images are not transferred directly from the plates to the paper but this is done through rubber blankets as a medium.
First step is to develop the images. When offset printing began, the images had to be developed by the use of film negatives and they were later transferred to aluminum plates. However, a modern printing company would now develop the plates directly by using an image setting system. This plate is then put on a cylinder in the proper configuration. Water and ink, in that order, is spread on the image plates. The ink is poured over the image and to restrict it from spilling, a thin layer of water is put over the remaining part of the plate.
Next, the image is turned around when it is transmitted to a rubber blanket which is stuck to another cylinder. The image is turned around to its correct side by transmitting the image to sheets that have been cut in line with the requirement and are put on a different cylinder.
Printed sheets are stapled, glued, or assembled in any other manner as needed and the printing company sends them after giving some finishing touches.
Learn more about a printing companythat offers the best printing services. Grab a totally unique version of this article from the Uber Article Directory
categories: flyers,printing,Visual Graphic Arts,printing services,printing company,name card printing,business,advertising,marketing
Offset printing, also referred to as offset lithography, is a type of printing process used by virtually all large commercial printers. It is called offset, because the offset printing ink is not directly pressed onto the paper, but is distributed from a metal plate to a rubber mat where it is then set onto the paper.
Offset printing can be done on a web printing press, one that use huge rolls of continuously fed paper, or a sheet fed press that, as you would expect, uses sheets of paper. Both types of presses produce printed materials that can be cut to size after printing. Offset printing uses all of the latest technology in printing, including computers that aid in design. Computers are also used to generate instructions for the mixture of offset ink colors as well as their distribution to the paper.
Offset printing works because water and the inks used in the printing process do not mix. The images to be printed are created on the computer and then “burned” onto metal plates using a chemical developing process similar to photography. The metal plates are dampened with water which adheres to the areas without images. The ink is added next, one color at a time, where it sticks to the areas with images. The most modern systems use a direct-to-plate system in which the images are burned directly to the metal plates; the omission of a secondary step saves time and money.
Dear Sir,
I would like to know why is it that you find metal in offset inks? What is it use for and where does it come from so much so that some printers they require suppliers to confirm there is no metal content in the ink? Thank you.