I remember having to give press approvals for magazine covers at one of our sister plants when the interiors would be ran web but the customer insisted that the cover be ran sheetfed, and showing up on press to find out that the sister plant in question was using UV inks to run the job, because the client wanted UV varnish, and only having our humble SWOP3 proofs to show… I was surprised that we were able to match color to the client satisfaction. Not perfect but plenty close. That client was a bitch… I had to personally do all her color corrections, at her office… But her expresso coffee machine was good – small consolation :) / Roger From: Terence Wyse [mailto:wyseconsul@mac.com] Sent: Friday, December 8, 2017 4:36 PM To: 'colorsync-users?lists.apple.com' List <colorsync-users@lists.apple.com> Cc: Scott Martin <scott@on-sight.com>; Roger Breton <graxx@videotron.ca> Subject: UV Offset Printing (Re: Colorsync-users Digest, Vol 14, Issue 57) I’ve “G7’d" a few UV offset presses and their behavior is not all that different than normal offset. Some things to consider: * Ink chroma is down a little from typical offset inks. As I recall, yellow chroma/density was a bit less and black ink density especially was lower than typical coated offset. I recall black density on coated papers to be around 1.50-1.60 or about -.20 from non-UV inks. for this reason, SWOP colorimetry works better than GRACoL on coated papers. * Where the curing lamps are positioned makes a big difference in the overprint colorimetry. Interdeck curing results in a “dry” trap between units. If you want ink trap behavior more typical of offset inks, wet trap between the units and don’t cure until the last ink goes down. If you wet trap, you’ll get overprint colorimetry closer to GRACoL/SWOP/FOGRA. In my opinion, the best use of UV-cure offset inks is on uncoated papers where you can use a much higher ink film thickness without having ink drying issues. Also, the rather flat/matte look of UV inks doesn’t look so bad on matte uncoated papers. When printing on gloss coated papers, the gloss differential of the inks is pretty noticeable unless you post-coat. My 360-390nm worth. :-) Terry On Dec 8, 2017, at 4:20 PM, Roger Breton <graxx@videotron.ca <mailto:graxx@videotron.ca> > wrote: Scott, "UV Offset" and/or "UV Hybrid" inks, such as those used in sheetfed offset lithography, 40" Heidelgerg, Komori, Mitsubishi, Roland, KBA presses, to my humble knowledge, are formulated with a photo-initiator such that they instantly dry when illuminated by a light source containing certain wavelengths of light, in the UV range, such as 360nm. I'm not sure if it's that exact wavelength, though. I confess I have not personally seen much "UV curable inkjet printing" in my young carreer. Please excuse my ignorance but where have you seen them being used? Is that what Mike was referring to? Sorry I missed that entirely. Best / Roger -----Original Message----- From: Colorsync-users [ <mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com> mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Scott Martin Sent: Friday, December 8, 2017 9:11 AM To: colorsync-users < <mailto:colorsync-users@lists.apple.com> colorsync-users@lists.apple.com> Subject: Re: Colorsync-users Digest, Vol 14, Issue 57 I see! Mike is asking about UV offset, not UV curable inkjet printing... Scott Martin <http://www.on-sight.com/> www.on-sight.com On Dec 7, 2017, at 3:51 PM, Roger Breton <graxx@videotron.ca <mailto:graxx@videotron.ca> > wrote: Good points, Paul. I have personaly seen many sheetfed presses running UV inks hitting pretty much the same Lab colorimetry on their process color inks than with conventional inks. / Roger -----Original Message----- From: Colorsync-users [mailto:colorsync-users-bounces+graxx=videotron.ca@lists.apple.com] On Behalf Of Paul Sherfield Sent: Thursday, December 7, 2017 7:16 AM To: colorsync-users@lists.apple.com <mailto:colorsync-users@lists.apple.com> Subject: Re: Colorsync-users Digest, Vol 14, Issue 57 Hi Mike If the UV offset inks match ISO 2846 then the standard Fogra 39/51/47/52 or G7 based profiles can be used as normal for proof simulation and process control on press. Regards Paul Sherfield The Missing Horse Consultancy Ltd 07899 906385 http://www.missinghorsecons.co.uk Follow us on: Twitter.com/missinghorse Member - UK TC130 Technical Advisory Group (ISO 12647 Printing Standards) Chair - BPIF Colour Quality Scheme certification steering group UK Representative-ISO TC130- WG13 for printing standards certification _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com <mailto:Colorsync-users@lists.apple.com> ) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/graxx%40videot ron.ca This email sent to graxx@videotron.ca <mailto:graxx@videotron.ca> _______________________________________________ Do not post admin requests to the list. They will be ignored. 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