日本語
On a small front panel to be manufactured as a PCB, I want to use white silkscreen over exposed copper. (Or rather exposed tin, to be precise -- the copper will be tinned via HASL.) This is purely for cosmetic effect: I am looking for a white surface with a logo showing as an exposed tin pattern.
I don't want to put solder mask below the silkscreen in that area, because the alignment won't be perfect in production: Even if I define the same logo pattern in the solder mask layer, I would still expect to get unwanted fringes of solder mask showing on one side of the logo.
I am aware that board houses will typically clip the silkscreen in areas without solder mask. I intend to ask them not to clip the silkscreen for this board; this has worked before, in a case where I wanted silkscreen on bare FR4.
My concern is: Will the silkscreen adhere properly (reasonably well?) to the exposed metal? Has anyone actually tried this -- intentionally or accidentally -- and can comment on how durable the silkscreen was?
Thanks!
- Comments(1)
A****min
Jul 12.2019, 17:07:27
There are a few different types of ink used for silk screening ie a different ink is used for aluminium substrate boards where the aluminium will be exposed.
An acid etch base will adhere very well to the tin.
For wearability - remember you can always spray a clear lacquer over the silk screen.
