Joyce,
The degree of quenching of fluorescent tracer during UV cure depends primarily on 2 factors. 1. The wavelength and intensity of UV radiation and 2. The degree of loading of UV tracer in the formulation.
The UV tracer is one of the more expensive ingredients in the formulation and so its use is typically kept to the lowest dose that will give 'acceptable' fluorescence for inspection purposes... the definition of 'acceptable' varies between material manufacturers and not all UV coatings are equal in this regard.
Most of the common UV tracers have absorbtion peaks in the 360-400nm range. Formulations prepared with initiation packages that are active in this range will suffer from quenching more than those with initiation packages primarily formulated in the 250-300nm range.
Mercury doped lamps (Fusion 'H' or 'H+' style) produce most of their intensity in the 250-350 nm ranges and so typically 'quench' the UV tracer less than a "D' style lamp which has a significant output of intensity at these longer wavelengths.
My advice, look for materials formulated with more UV tracer and initiation packages designed to activate at lower wavelengths, with lower required overall dose (combination of intensity and time) and you should be able to find materials that fluoresce very strongly post-cure - at least as well as conventional coating materials. Also, avoid multiple cure exposures wherever possible, for a whole number of reasons.
Hope this helps,
Phil.
Phil Kinner
PVA European Sales Manager
+44 07703 795422
[log in to unmask]
"Where precision drives production".
On 17 Jun 2011, at 01:55, Joyce Koo wrote:
> But Ha, you guys don't know what you missing: Doug Pauls conformal coat webinar just finished today! Definitely increased few notch on the coating IQ. Now: what is the element causes coating FL? My Friday Questions: If you use UV coating, some curing condition will quench the FL. How do you prevent that?
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Joyce Koo [mailto:[log in to unmask]]
> Sent: Thursday, June 16, 2011 08:49 PM
> To: [log in to unmask] <[log in to unmask]>
> Subject: Re: [TN] NTC Friday Element Quiz - the Question
>
> Wow, you smarties. I am sure feel like dummynium.
> --------------------------
> Sent using BlackBerry
>
>
> ----- Original Message -----
> From: Steven Creswick [mailto:[log in to unmask]]
> Sent: Thursday, June 16, 2011 08:40 PM
> To: [log in to unmask] <[log in to unmask]>
> Subject: Re: [TN] NTC Friday Element Quiz - the Question
>
> Dave,
>
> I believe the element you are quizzing us on is ruba-dub-Dubnium, but it
> seems to have progressed through the names Dubnium 1968, Neilsbohrium 1970,
> Hahnium 1970, Joliotium (recommended) 1994, and finally back to Dubnium in
> 1997.
>
> Boy these guys need to get a life...
>
>
>
> Element 105 - Dubnium was synthesized by a Soviet team in 1968
> was re-synthesized by the same Soviet team in 1970, and called Neilsbohrium
> Element 105 - Hahnium was synthesized by A US team in 1970
> The name Joliotium was recommended in 1994
> The name Dubnium was finally accepted in 1997
>
>
>
> Steve Creswick
> http://www.linkedin.com/in/stevencreswick
> 616 834 1883
>
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman
> Sent: Thursday, June 16, 2011 5:43 PM
> To: [log in to unmask]
> Subject: [TN] NTC Friday Element Quiz - the Question
>
> Hi folks - Here is the Friday Element Quiz Question (this one may take
> some sleuthing so the quiz is going out early):
>
> The Question:
>
> This element has a very contentious history pertaining to who actually
> first discovered it. This element has been produced by bombarding
> americium-243 with neon-22 atoms and bombarding californium-249 with
> nitrogen-15 atoms. The element was "finally" named in 1997. The longest
> lived isotope of this element has a half life of 34 seconds.
>
> Bonus Question: List the two names that were used for this element prior
> to 1997.
>
>
> The quiz winner will get the services of Clumpy and Kloumpios for the
> week.
>
> So far Clumpy and Kloumpios have:
>
> Week 1 Lamar Young, SCS Coatings
> - accomplished nothing (drank lots of coffee)
>
> Week 2 Bev Christian, RIM
> - conducted REACH material testing
>
> Week 3 Drew Meyer, Benchmark Electronics Inc.
> - Solderability testing and mowed the lawn
>
> Week 4 Ian Fox, Goodrich
> - had an epic journey of travel
>
> Week 4 Gary Ferrari, Garrick Global
> - unknown
>
> Week 5 Fredrick Miller, Astrolab
> - unknown
>
> Week 6 David Nelson, Raytheon
> - Were tackling dummys for Dallas Cowboys
>
> Week 7 Graham Collins, L3 Communications
> - Cleaned gutters and painted window trim
>
> Week 8 Bill Noel, ITT Geospatial Systems Division
> - unknown
>
> Week 9 Steve Gregory of RD Circuits
> - unknown
>
> Week 10 David Bealer of Watchfire Signs
> - descaled the in-line wash machine! Ouch!
>
> Week 11 Dick Krug of Sparton Corporation
> - assisted with AS9100 quality management systems requirements audit
>
> Week 12 Steve Creswick of Balanced Enterprise Solutions
> - Acted as Steve's "go fer" due to a broken leg!
>
> Week 13 Gebhard Neifer, Delphi
> - conducted a plasma pre treatment Taguchi DOE for a sealing process
>
> Week 14 Bev Christian, RIM
> - assisted with a tin pest investigation/test
>
> Week 15 Bev Christian, RIM
> - assisted Bev shoveling snow
>
> Week 16 David Bealer of Waatchfire Signs
> - assisted with reflow profiling
>
> Week 17 Brian Ellis, rumored to be retired
> - assisted with rewiring the house, had a tractor accident and found
> his cousin Kloumpios
>
> Week 18 Denny Fritz, SAIC
> - assisted with tin whisker inspection/examinations
>
> Week 19 Graham Collins, L3 Communications
> - assisted with scraping barnacles, boat paint and boat engine
> maintenance
>
> Week 20 Mark Woolley, PTRL Laboratory Avaya
> - assisted with weather observations (70F to snow) and resolving
> electrochemical migration failures
>
> Week 20 Tom Carroll, Boeing Defense, Space and Security
> - assisted with commercial aircraft galley inspection
>
> Week 21 Brian Ellis, supposedly retired, and Tom Carroll, Boeing Defense,
> Space and Security
> - assisted with root cause corrective action tasks
> - assisted with nothing but catching up with the family
>
> Week 22 Drew Meyer, Benchmark Electronics Inc.
> - assisted with metallographic cross-sections and Dye & Pry testing
>
> Week 23 Bev Christian, RIM
> - assisted with a creep corrosion project and the setting up of an oxygen
> bomb
>
> Week 24 Steve Gregory, RD Circuits
> - assisted with ?????
>
> Everyone have a great weekend.
>
> Dave Hillman
> Rockwell Collins
> [log in to unmask]
>
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