Hey Don!
It's Acrylic...
Steve
Sent via BlackBerry by AT&T
-----Original Message-----
From: Don Vischulis <[log in to unmask]>
Sender: TechNet <[log in to unmask]>
Date: Mon, 10 Jun 2013 14:10:12
To: <[log in to unmask]>
Reply-To: TechNet E-Mail Forum <[log in to unmask]>, Don Vischulis
<[log in to unmask]>
Subject: Re: [TN] Labels that withstand Wavesolder with alcohol based flux
Do the labels have acrylic or silicone adhesive? Acrylic is less resistant than silicone adhesive.
Don Vischulis
Sent from my iPhone
On Jun 10, 2013, at 2:04 PM, Steve Gregory <[log in to unmask]> wrote:
> Hey Richard!
>
> Tried curing them last Friday like you said, but no joy. Still
> blistering up after wave and/or washing off in our inline DI cleaner.
> Here are a couple photos that I didn't post last week:
>
> http://stevezeva.homestead.com/BubblyLabel.jpg
> http://stevezeva.homestead.com/BubblyLabelClose.jpg
>
> The labels are polyimide with a white topcoat for thermal transfer
> printing. They are supposed to be good to 1000 F., but you can see the
> blistering in the close-up photo. You can also see the adhesive
> bubbling-up beneath the kapton in the blister at the top of the number
> 2. When the boards go through the DI wash, the labels either fall off,
> or are just about to. The adhesive has turned to mush beneath the label.
>
> I still think it's the alcohol attacking the acrylic adhesive. We sent
> an email to the label manufacturer who said they would forward
> everything to their process engineering group...still waiting to hear
> back from them.
>
> Anybody else had this problem?
>
> Steve Gregory
>
> -----Original Message-----
> From: Stadem, Richard D. [mailto:[log in to unmask]]
> Sent: Thursday, June 6, 2013 2:07 PM
> To: TechNet E-Mail Forum; Steve Gregory
> Subject: RE: [TN] Labels that withstand Wavesolder with alcohol based
> flux
>
> Whatever label you use, consider curing them at 90 deg. C for 1 hour.
> That helps even common paper labels to be able to withstand wash
> processes, etc, a little better.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
> Sent: Thursday, June 06, 2013 3:04 PM
> To: [log in to unmask]
> Subject: [TN] Labels that withstand Wavesolder with alcohol based flux
>
> Hi All,
>
> I know I have had PCB label issues not standing-up to alcohol based flux
> and wave solder in the past and have found some that worked...but
> because I'm so absent minded, I forgot which ones they were.
> The labels that we are using now are thermal transfer ink printed, they
> SAY that they can withstand wave soldering processes, but the adhesive
> is acrylic and the alcohol in the flux attacks the adhesive, and the
> labels wash off in our DI cleaner.
>
> Anyone got a good recommendation for label stock?
>
> Steve
>
>
>
>
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