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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