I can't say I've ever cross-hatched anything, intentionally anyway. But when I do have a large and continuous flat surface, whether it be copper or laminate, I try to create some surface irregularities to help improve soldermask adhesion.
I usually do this with stitching vias or robber dots placed on a .250" (6.35mm). I have had instances with soldermask flaking, especially from more exotic material and this seems to help alleviate the issue.
-Jeffrey
________________________________________
JEFFREY A. JENKINS, CID+
SR. PCB/CAD Designer
L-3 COMMUNICATIONS -
LINKABIT DIVSION
3033 Science Park Rd.
San Diego, CA 92121
Tel: (858) 552-9832
Fax: (858) 552-9487
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From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Pete Waddell
Sent: Wednesday, July 29, 2009 4:58 PM
To: [log in to unmask]
Subject: Re: [DC] Hashing-Out Hatching
This might be one of those archaic things from long, long ago ( in a land faaaaaar away) but I recall using cross hatching and it seems it had to do with either a solid plane acting as a heat sink at assembly, but again that is an old memory. I also remember that the x hatching on flex was for increased flexibility.
Anybody got a clue?
p.
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Scott Riley
Sent: Wednesday, July 29, 2009 7:51 PM
To: [log in to unmask]
Subject: Re: [DC] Hashing-Out Hatching
The majority of my designs are flex circuits and I use cross hatching for GND planes and large conductors all the time. This is done for flexibility. However, I have never used it in on a PCB design.
I'd be curious to know why it is recommended.
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, July 29, 2009 7:18 PM
To: [log in to unmask]
Subject: [DC] Hashing-Out Hatching
Greetings,
I was just reading through the latest draft of IPC-2222,
and stumbled into the advice in section 10 regarding
"large conductive areas", where we are advised to
use some kind of etched pattern (cross-hatching)
for any area larger than a 25mm diameter circle.
I have done this exactly once in the last 22 years,
does anyone else do this?
Has anyone ever experienced a problem by NOT doing
this? (not counting soldermask over HASL)
Jack
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