No problem for me, Doug. Ten P.I.T.A customers who know all the answers are much easier to deal with than one P.I.T.A. who knows nothing (but thinks they do).
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, September 22, 2016 3:42 PM
To: [log in to unmask]
Subject: Re: [TN] Fwd: coating complaint
Ohhhhh no, you don't want me as a customer. I know ALL the unanswerable questions to ask. Could be a major P.I.T.A. if I wanted to be....
Doug Pauls
Principal Materials and Process Engineer Rockwell Collins
On Thu, Sep 22, 2016 at 3:20 PM, lduso - Diamond-MT.com < [log in to unmask]> wrote:
> Rich, I couldn't agree more. And our batting average is about the same
> as yours, .500.
>
> We need more customers like Doug.
>
> Lloyd Duso
> Plant Manager
> Diamond-MT
> (814) 535-3505
> www.Diamond-mt.com
>
> On Thu, Sep 22, 2016 at 3:38 PM, Richard Kraszewski <
> [log in to unmask]> wrote:
>
> > Steve - We see the same issue when it gets really thin. We proceed
> > as
> > follows:
> >
> > > State that fluorescence of a coating is an aide to inspection, not
> > > a
> > requirement.
> > > Coating will often thin -out at sharp edges. Laws of physics
> > > related
> > to surface tension & surface energy.
> > > If insufficient coating is suspected with UV & their naked eye
> > (spectacles are OK), operators can use up to 4X magnification and
> nature
> > white lighting to determine if coating is present based upon gloss.
> >
> > Common customer reply is that if coating is indeed present, then is
> > must be too thin to be in specification.
> > To which we reply back that the industry (IPC) understands this
> > phenomenon and a Qpanel hence can be used to monitor and control
> > thickness. If perfect coating uniformity is required , parylene
> > should be called out.
> >
> > We are successful in the above argument with customers perhaps 50%
> > of
> the
> > time at best. Rest of the time we touch up. ;>(
> >
> > Rich Kraszewski / PLX
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> > Sent: Thursday, September 22, 2016 10:36 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Fwd: coating complaint
> >
> > Hi Guy,
> >
> > I got your photos posted, had to do a little repair with my web page
> > software after the last Windows update. Here are the images:
> >
> > http://stevezeva.homestead.com/coating_under_no_filter.jpg
> > http://stevezeva.homestead.com/customer_complaint-skips.jpg
> > http://stevezeva.homestead.com/coating_under_UV2.jpg
> > http://stevezeva.homestead.com/coating_under_UV2-1.jpg
> >
> > I see the same thing on component edges sometimes. It's like the UV
> tracer
> > in the coating thins out or separates out and under UV light it
> > looks
> like
> > there's no coating. We've got stuff kicked from a customer for this
> > problem. If I can find the photos I'll post mine...
> >
> > Steve
> >
> > On Thu, Sep 22, 2016 at 7:56 AM, Guy Ramsey <[log in to unmask]>
> wrote:
> >
> > > I am in over my head. I have little to no experience with
> > > conformal coating. Can anyone with more experience comment?
> > > thanks,
> > > Guy
> > > ---------- Forwarded message ----------
> > > From: Guy Ramsey <[log in to unmask]>
> > > Date: Thu, Sep 22, 2016 at 9:51 AM
> > > Subject: Fwd: coating complaint
> > > To: [log in to unmask]
> > >
> > >
> > > I sent this message on to a friend who posts images for review by
> > > members of the IPC technet.
> > > We are looking for technical support and user experiences with
> > > this material.
> > > If we inspect at 5x-10x magnification we can observe the
> > > conditions that our customer is complaining about.
> > > But, our application process seems well controlled and the
> > > condition does not exist when the material is first dispensed. The
> > > material flows as it cures and becomes thin at the edges of the components.
> > > Thin enough so that is does not glow under UV light. In some
> > > instances components appear to have no coating (when viewed under
> > > UV). However under normal light it is easy to see the parts are coated.
> > > Is this normal behavior for the material? Can we expect normal
> > > performance from the the coating?
> > > Guy Ramsey
> > >
> > > ---------- Forwarded message ----------
> > > From: Guy Ramsey <[log in to unmask]>
> > > Date: Thu, Sep 22, 2016 at 9:41 AM
> > > Subject: coating complaint
> > > To: Steve Gregory <[log in to unmask]>
> > >
> > >
> > > Hi Steve,
> > > Can you post these images on your homestead page for the group please?
> > > The images are of acrylic coating Humiseal 1B31. We are applying
> > > a thinned mix using a dispenser through a fine needle (25AWG).
> > >
> > > Under room lighting we can see coating. Under UV light, at this
> > > magnification our customer is complaining about skips. I don't
> > > have enough experience with the material to know if this is normal or not.
> > > Notice how the resistor appears to have no coating under UV, but
> > > in normal light it is clearly coated.
> > > Also notice how the coating flows off of the components at the
> > > edges, leaving only a thin coating that may not glow under UV light.
> > > Are these normal attributes of this type coating.
> > >
> > > We do not see this with Urethane spray coatings.
> > >
> >
> > --
> >
> >
> > This email and any attachments are only for use by the intended
> > recipient(s) and may contain legally privileged, confidential,
> proprietary
> > or otherwise private information. Any unauthorized use,
> > reproduction, dissemination, distribution or other disclosure of the
> > contents of this e-mail or its attachments is strictly prohibited.
> > If you have received
> this
> > email in error, please notify the sender immediately and delete the
> > original.
> >
>
|
