UV Offset Printing (Re: Colorsync-users Digest, Vol 14, Issue 57)
UV Offset Printing (Re: Colorsync-users Digest, Vol 14, Issue 57)
- Subject: UV Offset Printing (Re: Colorsync-users Digest, Vol 14, Issue 57)
- From: Terence Wyse <email@hidden>
- Date: Fri, 08 Dec 2017 16:36:23 -0500
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 <email@hidden> 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=email@hidden
> <mailto:colorsync-users-bounces+graxx=email@hidden>] On
> Behalf Of Scott Martin
> Sent: Friday, December 8, 2017 9:11 AM
> To: colorsync-users <email@hidden
> <mailto:email@hidden>>
> Subject: Re: Colorsync-users Digest, Vol 14, Issue 57
>
> I see! Mike is asking about UV offset, not UV curable inkjet printing...
>
> Scott Martin
> www.on-sight.com <http://www.on-sight.com/>
>
>
>
>> On Dec 7, 2017, at 3:51 PM, Roger Breton <email@hidden
>> <mailto:email@hidden>> 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=email@hidden] On
>> Behalf Of Paul Sherfield
>> Sent: Thursday, December 7, 2017 7:16 AM
>> To: email@hidden
>> 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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>>
>>>
>>
>>
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