Sounds like they didn't stack the prepreg in the proper order, or forgot to put on a final layer of thin prepreg. High resin content prepregs (like 1080 or 106) should go on last to give a smooth copper surface, compared to low resin content prepreg (7628), which has a tendency to show more of the weave texture.
This was discussed on TechNet just recently.
Best Regards,
Roger M. Stoops, CID+
Trimble Navigation Ltd., Dayton, OH, USA
Ph: +01 937.245.5288
Fax: +01 937.233.7511
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Rob Goodwin
Sent: Thursday, April 15, 2004 11:32 AM
To: [log in to unmask]
Subject: Re: [TN] PCB Surface not smooth
The roughness is in the laminate.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Jeffrey Bush
Sent: Thursday, April 15, 2004 10:14 AM
To: [log in to unmask]
Subject: Re: [TN] PCB Surface not smooth
Is the roughness on conductor, base laminate or mask?
Jeffrey Bush
Director, Quality Assurance and Technical Support
76 Technology Drive - POB 1890
Brattleboro, Vermont 05302-1890
Tel. 802.257.4571.21 Fax. 802.257.0011
[log in to unmask]
http://www.vtcircuits.com
-----Original Message-----
From: Rob Goodwin [mailto:[log in to unmask]]
Sent: Thursday, April 15, 2004 11:05 AM
To: [log in to unmask]
Subject: [TN] PCB Surface not smooth
We received some boards from the vendor. Half of the boards look good
and the other half have surface roughness like a texture. The board
shop said they were 2 different runs and on one they forgot something
during press to make it smooth. 1.What did they forget? 2.Is there a
spec on PCB surface?
Thanks,
Rob
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