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Print quality is determined, especially in inkjet, by the resolution of the print in digital pixels per inch (DPI). But this is not the only factor, a fine print is only possible if the size and position of the dots can be tightly controlled. The inkjet head itself plays its part in jetting a particular droplet size at the right time. If the substrate which is passing underneath the droplet is not in the determined position, then all is lost. Ensuring the substrate is in the correct position is a function of the web transport and more specifically the ability of the web transport to minimise deviation of the substrate as it passes through the machine.
Furthermore, the web transport acts as the structure and base machine so it is important that it is free from vibrations, is temperature controlled, is stable and reliable and has suitable pre-inkjet web treatment processing. Finally, it must be properly integrated to the inkjet part of the machine to ensure accuracy between the systems.
The need for accurate cross positioning of the substrate requires a highly accurate and aligned machine with precision elements. The fine tension control and interfacing with the inkjet requires sophisticated servo motor and drive technology working on a virtual lineshaft to remove all mechanical inaccuracies. The ink types, coat weights and running speeds all influence the design and lead to the need for a fully integrated end solution. The product specification and the type of substrates being processed can influence both the design of the web transport itself, requiring different web handling techniques, different drying technology and solutions at vastly different web widths. This requires a large catalogue of modular components designed at all widths.
The specification also determines any in-line hybrid solutions that may also be required to deliver a product, such as flexo or die cutting. At different widths and speeds this too requires a great catalogue of designs and the ability to integrate into a final solution.
Inkjet presses are being marketed towards short run, easy operation, fast set-up and not requiring the infrastructure of a conventional analogue printing press. Therefore we have to forget about the big print factories full of skilled and experienced printers. And think about more of a lab environment, where anyone can load a job and print. This leads us to a press that must be fully integrated into a small footprint with levels of automation that set the job up and guide the operator through a determined workflow.
Specifically, inkjet press configurations require:
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