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darryln

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  1. >The concern is only the UV curable ink will polymerize in the head/lines/dampers, right? Right.
  2. yes, the ink will cure over time from ambient UV because the stock plumbing does not block UV wavelengths.
  3. Also on ebay, stocked in US. These are Dx5. https://www.ebay.com/sch/i.html?_odkw=uv+ink+damper&_osacat=0&_from=R40&_trksid=p2045573.m570.l1313.TR0.TRC0.H0.Xuv+ink+damper+epson.TRS1&_nkw=uv+ink+damper+epson&_sacat=0
  4. Response from INX regarding their LE UV ink cure spec. I asked: The product manager relayed the following from engineering. #1 so should I interpret this as requiring all 3 bands simultaneously? #2 Response is meaningless. Was looking for energy units per areal units. Apparently the engineer didn't understand the question posed. Based on just this response alone, I wouldn't want to even deal with the company, let alone spec their inks. WTF is wrong with business people these days. SMDH
  5. I asked Firebird about the cure specs on their UV LED Ink, and they said: 2W/cm^2 @ 395nm (380 to 410nm).
  6. I looked at Digi-Key pricing on UV LED chips (thinking full DIY design) and about fell over when I saw the pricing on the higher power units. 20mA LEDs are fairly cheap, but the physical size limits the overall energy density that is achievable.
  7. I asked Firebird for tech specs via their website form. Here's hoping!
  8. The aforementioned ink 2W/cm2 requirement is 1366 lumens per cm2. The ebay 50W unit produces 50-60 lumens, and the area is 0.075cm2 (27.5mm2) giving a flux density of 667-800 lumens per cm2, therefore 2x50W should work, at a cost of $32 each. You might have to push them a little hard at a slightly higher forward current. Forward voltage is 32V, and current is 1000mA. Be nice to find a real data sheet for these. Will the printer's 42V supply handle the additional 2A load? I'm thinking probably not. DC 3-38V 1000mA constant current supply: http://www.ebay.com/itm/Power-Supply-3W-10W-20W-30W-50W-DC12V-24V-to-DC3-38V-Constant-Current-LED-Driver-/122547078334?var=&hash=item1c886004be:m:mnj1ZT3pZgJhXljPOVQhg7g
  9. Cure specs for Epson compatible ink. NAZDAR 260 for DX‐4 and DX‐5 printhead. Cures at 395nm @ 2 watts/cm2 . 80 deg F recommended max temp. https://www.nazdar.com/Portals/0/TDS/UV-Inkjet/NAZDAR_260_Series_UV_Inkjet.pdf
  10. I found some small 10W lamps in a range of wavelengths: 365-370, 395-400, and 415-420. But this leaves a big hole - 370-395nm. 365-370nm $16 395-400nm $5 415-420nm $5
  11. I realize this thread is about UV Ink Cure lights, but I found this somewhat technical article on the various ink formulations. https://sdgmag.com/features/uv-cure-ink-technology And now to bring the post on-topic.... Excerpt from the article: LED curing systems generate UV light around one peak wavelength, ink formulators have had to search out and employ photoinitiators that optimally stimulate at the same exact wavelength as the one the LED curing system generates. Conversely, LED lamp manufacturers have focused on tuning their systems for wavelengths to match those that will stimulate known and readily available photoinitiators. The following light wavelengths will work with certain photoinitiators: UV-A at 365 nm, 375 nm, 385 nm and 395 nm, and into the visible light range 405 nm and at 415 nm. Ink maker INX International reports that 365 nm wavelengths cure dark colors better than 385 nm, while 385 nm cures light colors better. Equipment manufacturers may eventually include multiple LED types with sets tuned to different wavelengths to match the best chemistry for applications. -------------------------- So, to design a DIY UV array, I think you have to begin by choosing the ink, then design (or select) the UV array to match the ink formula's range of photoinitiator wavelengths. So the basic design process would be something like: Identify UV cure ink recommended for use with Epson inkjet printers Based on ink cure specs, design or select an LED array that delivers the required energy, in the required wavelength ranges, during the window of time the array (i.e. print head) spends over the freshly-printed uncured ink. Ensure the UV array operates within its recommended thermal operating range. Add cooling as needed. Ensure the UV cure ink is kept within recommended temperature. Add cooling as needed. Ensure UV light does NOT reach the print head nozzles by blocking it with a shield or whatever. Ensure the additional weight of all this stuff does not impact print head ballistics, stability, accuracy, etc. ?? profit!! p.s. I'm a total noob at DTG and UV cure inks, so please excuse if my terminology is derpy, or I'm just blithely stating obvious crap that everybody else already knows.
  12. $45 for 100W array, not bad. https://www.ebay.com/i/231618129730?chn=ps&dispItem=1&var=530850372249
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