March 28th, 2010, 12:10 PM
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#9 (permalink)
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Junior Member
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- Mar 2010
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Re: Printing positive film for screen printing
Your film output device choice may depend to some degree on what you intend on printing and how much volume you expect to have. We use an Agfa 800 Imagesetter. We went that route for a couple reasons. First, we print mostly CDs/DVDs and other higher resolution hard surface items. Films from an imagesetter have higher density (blacker dots) then what you'll get from an ink-jet. We consider anything with a density below 3.9 to be on the light side. You'll be lucky to get that dark ever with an ink-jet. Thats important when producing the higher resolution halftones (100/120 LPI) that we do. Also, those higher resolutions demand tighter registration tolerances. Imagesetters are specifically designed to produce separations very accurately so the dots in your C M Y and K films will register accurately. Finally, there's the cost. We can make 14" wide films for about $0.80/foot as a flat cost. This is not dependent on coverage as would be the case with an ink or toner based system - so large areas of solid black don't increase the cost's per film. If you're going to produce lots of films or need high resolution, consistent results for process printing I would go this route ... or look at a direct to screen imager. These Imagesetters can be picked up on the used market for about $3000 including the imagesetter, RIP and film processor. You'll have to deal with the wet chemistry, but we've found thats not to big of an issue and the benefits outweigh the inconveniences.
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