CTP systems, which expose and process printing plates directly from digital files, classify under 844230 as machinery for preparing printing components. They are prepress equipment, not printing machines, and therefore belong in this heading rather than in the printing machinery heading.

Yes, prepared printing plates, cylinders, and blocks ready for use on a press are classified under 844250 as a distinct subheading within this heading. They are not classified with the plate-making machinery (844230) or with the printing machines that use them.