Hi Steve,
I thought about how this might happen, and why sometimes bottom & sometimes top.
If the board house has more than one copy of the mask artwork for each side, one of those sets might have the image looking like a donut instead of a pancake (hey, I don't work in a board house, so I'm using the best tools I can muster at this hour of the morning). Multiple photo tools could be used simultaneously in a case of very high volume so multiple imagers could be utilized for parallel processing.
Just looking for a logical explanation.
Ed Popielarski
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, November 11, 2015 8:09 AM
To: [log in to unmask]
Subject: Re: [TN] Unusual solder mask defect...
Hi James,
This is a mixed technology board, so there is the SMT on the topside along with the through hole pattern. I don't know how the mask was applied.
Steve
On Wed, Nov 11, 2015 at 4:22 AM, James Head <[log in to unmask]> wrote:
> Is this a common solder-mask pattern? I.e. is it a through-hole only
> board that would have the same soldermask apertures on both sides of the board?
> Was it an air-spray or curtain-coat application?
>
> Regards,
> James
>
> James Head BEng CID+ MIIE MIET
> Senior PCB CAD Engineer
> Crowcon Detection Instruments Limited
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