But I know Lloyd loves a challenge.....
Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins
On Tue, Jun 20, 2017 at 6:31 AM, lduso - Diamond-MT.com <
[log in to unmask]> wrote:
> We often use the Kapton for masking when we want the tape to cause
> de-wetting. Like when using UV40 UV cure, the dewetting makes it easier to
> demask. If you cure the UV material over the green tape, it's damn near
> impossible to remove.
>
> Lloyd Duso
> Plant Manager
> Diamond-MT
> (814) 535-3505
> www.Diamond-mt.com
>
> On Mon, Jun 19, 2017 at 7:08 PM, Yuan-chia Joyce Koo <[log in to unmask]>
> wrote:
>
> > dupont Kapton is not everybody cup of tea. many "Kapton" equivalent
> with
> > silicone or acrylic adhesive leave residue on the gold wire bonding pad,
> > but not Dupont Kapton... if you can find true Dupont, stay with them.
> > (from what I heard, they only sell the roll of kapton tape now, but let
> 3rd
> > party put on what ever the adhesive.... so your Dupont may have different
> > adhesive... (still have half roll of Kapton... true one as collection...
> > thick, enough to patch up stacking issue to prevent short...).
> > good old days.
> > jk
> >
> > On Jun 19, 2017, at 5:42 PM, Wayne Thayer wrote:
> >
> > I believe that the right silicone based PSA would work fine. No one is
> >> more concerned about contamination than plating shops. "Plater's tape"
> is a
> >> mylar carrier with silicone adhesive. It's used in PCB fabs all of the
> >> time. But I guess the silicone is in a highly stabilized form that
> doesn't
> >> leach oil like the masking dots Phil is mentioning below. I've used
> DuPont
> >> Kapton tape with silicone adhesive, and I've never had an oil leaching
> >> problem. Not good stuff for masking because the polyimide material
> itself
> >> causes the paint to bead up.
> >>
> >> When I opened an R&D board fab lab, I chased out all silicone based
> >> compounds. So I learned about how bad the acrylic PSAs are: Those tapes
> >> drop little globs of acrylic PSA EVERYWHERE. True, they don't cause
> >> de-wetting like silicone has the potential to do, but they block plating
> >> where they've decided to stick anyway. If you want a real nightmare try
> >> plastering those danged "Post-It" notes on everything: the weakening
> done
> >> to allow them to be easily re-positioned frees up the acrylic globs.
> >>
> >> Anyway, this is a divergence because for relatively crude masking
> >> applications on surfaces that don't have to be perfectly clean, standard
> >> painter's materials are fine if you can address the static.
> >>
> >> Wayne
> >>
> >> -----Original Message-----
> >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
> >> Sent: Monday, June 19, 2017 1:58 PM
> >> To: [log in to unmask]
> >> Subject: Re: [TN] Conformal coat tape of acrylic
> >>
> >> Phil,
> >>
> >> Yes, I agree. I am not even looking at anything with a silicone
> adhesive.
> >> I've been extremely cautions not to introduce silicone into our process
> >> over the years. I've even gone as far as telling the tape slitters not
> to
> >> use the silicone solution on their blades when slitting our orders.
> >>
> >>
> >> -----Original Message-----
> >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Nutting, Phil
> >> Sent: Monday, June 19, 2017 4:26 PM
> >> To: [log in to unmask]
> >> Subject: Re: [TN] Conformal coat tape of acrylic
> >>
> >> Craig,
> >>
> >> We use Konform AR and at some point our acrylic adhesive masking dots
> >> were discontinued and replaced with a silicone based adhesive. The
> >> silicone worked, however I saw an odd fish eye pattern and blooming
> under
> >> UV light around the dots. You could watch the blooming as it cured.
> >>
> >> My 2 cents is to test the new mask materials with your coating and watch
> >> under UV light.
> >>
> >>
> >> Phil Nutting | HVP Development Engineer | Excelitas Technologies
> Corp
> >>
> >> Lab: +1 978.224.4332 | Office: +1 978.224.4152
> >> 35 Congress St, Salem, MA 01970 USA
> >> [log in to unmask]
> >> www.excelitas.com
> >>
> >>
> >>
> >>
> >>
> >> Please consider the environment before printing this e-mail.
> >>
> >> This email message and any attachments are confidential and proprietary
> >> to Excelitas Technologies Corp. If you are not the intended recipient of
> >> this message, please inform the sender by replying to this email or
> sending
> >> a message to the sender and destroy the message and any attachments.
> Thank
> >> you.
> >>
> >> -----Original Message-----
> >> From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Sullivan
> >> Sent: Monday, June 19, 2017 1:31 PM
> >> To: [log in to unmask]
> >> Subject: Re: [TN] Conformal coat tape of acrylic
> >>
> >> Thank you. I’ve requested samples of those recommended. Much to my
> >> surprise, I also found some on Humiseal’s website so I asked for
> samples of
> >> that as well.
> >>
> >>
> >>
> >> Steve: Yes, we go through rolls of that as well. But we have a couple of
> >> new assemblies where it’s giving us issues for some reason. I first
> thought
> >> it was cleanliness, then possibly just a bad lot of tape, but I’ve
> >> exhausted those conditions.
> >>
> >>
> >>
> >> Craig Sullivan
> >>
> >> Manufacturing Engineer
> >>
> >> IT Administrator
> >>
> >> Phone: (607) 266-0480 x115
> >>
> >> Fax: (607) 266-0482
> >>
> >> Email: [log in to unmask]
> >>
> >> Web: www.mplinc.com <http://www.mplinc.com/>
> >>
> >>
> >>
> >> MPL, Inc.
> >>
> >> 41 Dutch Mill Road | Ithaca | NY | 14850
> >>
> >> An ISO 9001:2008 Certified and ITAR Registered Company
> >>
> >> IPC member since 2004
> >>
> >>
> >>
> >> _____
> >>
> >> Confidentiality Notice:
> >> This e-mail contains privileged and confidential information which is
> the
> >> property of MPL Incorporated, intended only for the use of the intended
> >> recipient(s). Unauthorized use or disclosure of this information is
> >> prohibited. If you are not an intended recipient, please immediately
> notify
> >> MPL Incorporated and destroy any copies of this email. Receipt of this
> >> e-mail shall not be deemed a waiver by MPL Incorporated of any
> privilege or
> >> the confidential nature of the information.
> >>
> >> Export Control:
> >> This message is intended only for the addressee and may contain
> >> information that is company confidential or privileged. Any technical
> data
> >> in this message may be exported only in accordance with the U.S.
> >> International Traffic in Arms Regulations (22 CFR Parts 120-130) or the
> >> Export Administration Regulations (15 CFR Parts 730-774). Unauthorized
> use
> >> is strictly prohibited and may be unlawful. If you are not the intended
> >> recipient, or the person responsible for delivering to the intended
> >> recipient, you should not read, copy, disclose or otherwise use this
> >> message. If you have received this email in error, please delete it, and
> >> advise the sender immediately.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> From: lduso - Diamond-MT.com [mailto:[log in to unmask]]
> >> Sent: Monday, June 19, 2017 12:29 PM
> >> To: TechNet E-Mail Forum; Craig Sullivan
> >> Subject: Re: [TN] Conformal coat tape of acrylic
> >>
> >>
> >>
> >> 3m Green Tape 233+. The most common size we use is the 3/4", p/n 26334.
> >> Slightly stronger adhesion than the blue. We still stock the blue for
> >> masking delicate components, like radial resistors, specifically
> because it
> >> has low adhesion and there is less chance of damaging the components on
> >> demask.
> >>
> >>
> >>
> >>
> >> Lloyd Duso
> >>
> >> Plant Manager
> >>
> >> Diamond-MT
> >> (814) 535-3505
> >>
> >> www.Diamond-mt.com
> >>
> >>
> >>
> >> On Mon, Jun 19, 2017 at 11:59 AM, Craig Sullivan <[log in to unmask]>
> >> wrote:
> >>
> >> What masking tape is everyone using for Type AR coatings?
> >>
> >>
> >>
> >> Long story short:
> >>
> >> We used to use the St. Gobain M797 which was also known as Humiseal's
> >> HT-500. Due to numerous manufacturer issues, we stopped using it.
> >>
> >> One of our customers spec'd in the blue 3m painter's tape and we have
> >> been using it successfully for a while.
> >>
> >> We have some new assemblies where the 3m adhesion is terrible and am now
> >> back onto looking for a new tape, similar to what we all went through
> some
> >> 8 years ago.
> >>
> >>
> >>
> >> Craig Sullivan
> >>
> >> Manufacturing Engineer
> >>
> >> IT Administrator
> >>
> >> Phone: (607) 266-0480 x115
> >>
> >> Fax: (607) 266-0482
> >>
> >> Email: <mailto:[log in to unmask]> [log in to unmask]
> >>
> >> Web: <http://www.mplinc.com/> www.mplinc.com
> >>
> >>
> >>
> >> MPL, Inc.
> >>
> >> 41 Dutch Mill Road | Ithaca | NY | 14850
> >>
> >> An ISO 9001:2008 Certified and ITAR Registered Company
> >>
> >> IPC member since 2004
> >>
> >>
> >>
> >> _____
> >>
> >> Confidentiality Notice:
> >> This e-mail contains privileged and confidential information which is
> the
> >> property of MPL Incorporated, intended only for the use of the intended
> >> recipient(s). Unauthorized use or disclosure of this information is
> >> prohibited. If you are not an intended recipient, please immediately
> notify
> >> MPL Incorporated and destroy any copies of this email. Receipt of this
> >> e-mail shall not be deemed a waiver by MPL Incorporated of any
> privilege or
> >> the confidential nature of the information.
> >>
> >> Export Control:
> >> This message is intended only for the addressee and may contain
> >> information that is company confidential or privileged. Any technical
> data
> >> in this message may be exported only in accordance with the U.S.
> >> International Traffic in Arms Regulations (22 CFR Parts 120-130) or the
> >> Export Administration Regulations (15 CFR Parts 730-774). Unauthorized
> use
> >> is strictly prohibited and may be unlawful. If you are not the intended
> >> recipient, or the person responsible for delivering to the intended
> >> recipient, you should not read, copy, disclose or otherwise use this
> >> message. If you have received this email in error, please delete it, and
> >> advise the sender immediately.
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
>
|
