Waterless offset printing plates from TORAY
In contrast to conventional offset printing, the use of humidifiers is unnecessary in waterless offset printing technology. This does not only protect our environment to a large degree, it also provides printing results of the highest quality!
Important components of this printing process are the TORAY IMPRIMA printing plates. The silicone layer on the surface, which has a low surface tension, is ink-repellent, while the layer that lies below is ink-receptive and therefore a printing component. The areas that are to be printed are coloured sharply to the edges. This makes an increase in tonal value exceedingly small, and no fluctuations occur throughout the print-run. The inking of the printing plate is therefore stabilised after a few rotations, and waste sheets at the start of a print-run are reduced to a minimum.
We offer you a variety of new class of printing plates with enhanced performance features for the various waterless market segments.
Product overview for CtP applications
|Application||Product type||High durability||Standard||Water washable
High resolution with Cover foil
|Super high resolution|
- Designation A is for applications requiring long runs, while B and C is for medium and high resolution printing requiring medium run lenght.
- The Imprima SD is a special super high resolution plate only for high end security printing applications.
- The new IMPRIMA plate types are all based on the patented waterless technology of Toray.
- They constitute a new concept for digital printing plate production.
- All plates except the VG5 are without coverfoil and manufactured in the EU. The VG5 type is manufactured in Japan.
The CtP printing plate for high end waterless applications
TORAY IMPRIMA (TAC) is a non-ablative thermal printing plate. This means that no dust or vapours occur when images are put on the plate and that no removal of the plate layer therefore takes place. The structure is similar to that of an analog waterless printing plate. A polymer layer for printing is attached to an aluminium support, which is covered by a non-printing silicone layer with a protective film of polyester. For production with an autoloader, the plate is also available without the protective film.
Structure of the CTP printing plate
Illustrations can be added to new printing plates with all thermal CTP processing units available commercially, if they work with a wavelength of 830 Nm. The CTP plates, which are available commercially in all normal thicknesses, are characterised by a very low energy requirement of only 150 mJ/cm². Through their very high resolution of 4,000 dpi, and the exceedingly small dot size of 10 µ, a known quality can be problemlessly provided by CTP technology. An FM raster or the finest autotype rasters will therefore continue to be a domain of waterless offset printing.
The exposure and development process for CTP plates
The processing takes place in the same machines that are also used for analog waterless printing plates, which means that the main share of the “chemical process” consists of water. In contrast to thermal CTP plates for wet offset, the processing fluid (DP-1) does not have to be changed every 14 days; it keeps substantially longer, exactly like the PA-F post-processing agent. Analog and digital waterless printing plates can be developed in the same processor, whereby the nylon brushes must, however, be replaced by harder, spiral-wound or plugged PBT brushes.
TORAY TAN E
The analogue type printing plate for waterless offset applications
A waterless printing plate is no different from conventional printing plates when it comes to exposure. The negative printing plate can be exposed with a UV light that is standardly used in offset printing. The ink-receiving photopolymer layer contains the print information after exposure and development. The job of a fountain solution, namely of repelling the ink, is assumed by the ink-repelling silicone layer, which rises approximately 2 µm above the photopolymer layer.
The protective foil protects against mechanical damages, improves the vacuum in the printing frame and protects the plate surface before and during exposure from oxygen. After exposure, this protective foil is pulled off, when the plate is no longer light-sensitive. A rubber coating is not required.
The TAN E type is manufactured in Japan.