By Pira International Ltd
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Additional info for Developments in Banknotes
3). The intaglio process is widely used for the security printing of banknotes, passports, postage stamps and cheques, because it is hard to copy by the other processes. It is used rarely for commercial printing other than for some fine art prints. g. 4). 4). A photo-sensitive emulsion has been selectively exposed through a positive to create the image projected on to the screen. The emulsion is solidified in the non-image areas and the rest is washed out. The ink is forced through the screen by a flexible blade (the squeegee) on to the substrate that is supported under the screen.
This gives automatically controlled perfect register to the watermark pattern. All A subsequent printing and processing is automatically controlled to be in precise register with the watermark. silk screen printing unit applies OVI and has an ultraviolet (UV) and hot-air drying system. This obviates the need for separate OVI application, as in sheet-fed production. A four-colour wet offset printing tower uses the Orlof principle to apply four different colours on one wet offset plate. This is claimed to be superior to the normal dry offset used in banknote printing, producing perfect intercolour register and advantages in fine-line printing.
Algeria has the world’s latest web intaglio operation for banknote printing, installed in 2005. There have always been three main reservations about web intaglio banknote printing: It cannot match the tactility of sheet-fed intaglio. Although it can deliver fine lines plus some depth in portraits and vignettes, it does not leave enough ink on the paper to produce the highly tactile feel of sheet-fed intaglio, or the 3D effect so difficult to replicate by any other process. Page 38 © Copyright Pira International Ltd 2006 Developments in Banknotes Processing developments Because 4 of the way the presses have to be manufactured, web intaglio cannot provide the wide range of cut-sheet sizes required by HSPs serving different countries with widely different banknote sizes.