CTP (Computer to Plate) is a streamlined process of print production. Streamlined in that takes a finalized file from a computer and outputs it directly to a plate. The plates are made from a variety of materials ranging from aluminum to polyester. Once the plate is imaged, it can be used on the press. In the old CTF process the file was sent from the computer to a film processor, then the film image was transferred to the photographic plate so the plate could be used on the press. In the CTP process, the film step and its associated chemicals and bio hazard are completely eliminated.
When you remove the film step and the associated chemicals, you are saving on film and chemical costs, the chemical smell is greatly reduced, and you are producing high quality plates at a faster rate. Since we all know that time = money, what this means is that with each plate you produce, you are saving on the equipment, labor and supply costs that your company has when it produces a print piece for a client.
Because CTP Plate Making Machines use a new and straightforward technology, it stands to reason that there would be a variety of ways to implement it. This variety has emerged in the multiple technologies available for CTP, which are Violet, Thermal, Ink Jet and Poly Plate.
http://www.ecoographixsolution.com/printing-plate-machine/ctp-plate-making-machine/