in general - edge lifting due to possible following (1) floor life
exceeding allowable between the process - usually happened when the
clean room is boarder line on "clean" - reduce allowable floor life.
(2) residue on the surface of the coated surface and (3) viscosity
too high - surface tension pull back the coating before UV hits -
either due to non-uniform mixing or at end of the batch (solvent
evaporated). Of course there are many other possible causes, but all
the above can be eliminated if someone pay attention to control
process and leave some safety margin (not push to the limit. e.g. I
will never use batch at end of its shelf life, 70% is my sleep sound
bench mark... sure you can extend the shelf life, but you need to do
testing on properties, surface tension, solid content, share ratio,
etc.etc. the cost usually didn't show on MGR desk, but 100% of the
time is more than the batch - except special materials. plus the
risk you take on possible issue you didn't test - you never can test
it fully at cost as coating MFG for sure).
my 1.4 cents.
jk
On Jan 13, 2021, at 8:38 AM, Richard Kraszewski wrote:
> We don't use enough UV masking to give you a solid opinion.
> I assume what you are seeing may be related to shrinkage.
>
> Rich Kraszewski
> Senior Staff Process Engineer
>
> * * * * * * * * CONFIDENTIALITY NOTICE * * * * * * * *
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> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso - Diamond-
> MT.com
> Sent: Friday, January 8, 2021 9:17 AM
> To: [log in to unmask]
> Subject: Re: [TN] [External] [TN] Latex Masking Material for
> Conformal Coating
>
> <html><body><p style="background-color:#F5AD7C; border:1px solid
> black;">[EXTERNAL] Use caution when clicking links or attachments
> from unknown senders.</p><br></body></html> Doug
>
> Have you ever had any issues with the UV cure lifting slightly from
> a flat surface and allowing some creepage under? I had it happen a
> couple times but for the most part no issues.
>
> Lloyd Duso
> Diamond-MT
> (814) 535-3505
> www.Diamond-mt.com
>
>
> On Fri, Jan 8, 2021 at 10:07 AM Douglas Pauls < 0000000b68b3b1cd-
> [log in to unmask]> wrote:
>
>> Good morning Rich,
>> We have used the following with good success.
>> Kester Wondermask P - heat curable
>> Dymax Emax 906B and Dymax 9-20515 - UV curable masks. The 906B is
>> blue and thicker. The other is red and thinner.
>> Loctite AS8998 hot melt masking agent.
>>
>> ---
>> *Douglas Pauls *| Principal Materials and Process Engr | Advanced
>> Operations Engineering
>>
>> *COLLINS AEROSPACE*
>>
>> 400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
>>
>> *Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
>>
>> [log in to unmask]
>>
>> [log in to unmask] for all Export Compliant Items
>>
>>
>> On Fri, Jan 8, 2021 at 8:53 AM Richard Kraszewski <
>> [log in to unmask]> wrote:
>>
>>> Our preferred "non-ammoniated" liquid masking material for coating
>>> is on back order.
>>> I need to find another product.
>>> Can anyone please share which masking they have good success with?
>>>
>>> Rich Kraszewski
>>> Senior Staff Process Engineer
>>> Phone: (920) 969-6075
>>>
>>> * * * * * * * * CONFIDENTIALITY NOTICE * * * * * * * * This e-mail
>>> and any attachments are confidential from Plexus Corp. and
>> may
>>> contain information which is privileged, confidential, and/or
>>> protected
>> by
>>> non-disclosure agreements. They are intended solely for the use of
>>> the named addressee(s). . Any unauthorized use or disclosure may
>>> be unlawful. If you are not a named addressee, you must not use,
>>> disclose, retain or reproduce all or any part of the information
>>> contained in this e-mail or any attachments If you have received
>>> this transmission in
>> error,
>>> please destroy it and notify us immediately by return e-mail or by
>> calling
>>> + 1 888 208 9005.
>>>
>>
> <p></p>
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