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June 2015

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From:
Tony Lentz <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Tony Lentz <[log in to unmask]>
Date:
Mon, 8 Jun 2015 15:33:00 +0000
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Hello Victor,

The develop, etch and strip (DES) process produces a trapezoidal shaped circuit.  Normally the base of the circuit is wider than the top of the circuit.  The side walls of the circuit are typically curved with a slight concavity.  In some cases, the circuit is etched to the point where the width at the base is the same size as the top of the circuit.  The concave nature of the side walls becomes more exaggerated in this case.  

Here is a link to a website with a nice diagram showing the cross section of a copper circuit.  http://www.pcbuniverse.com/pcbu-tech-tips.php?a=4.   Scroll down the page a bit to the Etching section.   

The angle of these side walls is approximately 10-20 degrees off of vertical.  The angle between the base laminate and the sidewall of the circuit is about 70-80 degrees.


Best regards,

Tony Lentz
FCT Assembly
Field Application

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Thursday, June 4, 2015 12:59 PM
To: [log in to unmask]
Subject: [TN] Wet Chemistry, Develop Etch n Strip, PWB process

Fellow TechNetters:

  Typically, what are the two angles, i*so*trop*ic, forms after the copper sheet has been develop/circuitized?   I recall something about a slope.

Victor,


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