Jim:We had a similar problem with Dynachem HG 2 mil a few years back.	
	    The film was lifting along the edges in acid copper.Based on  
	    cross section analysis of the lifted areas it appeared to be	
	    occuring towards the end of the copper plating cycle.This was 
	    then subsequently overplated with Sn/Pb etch resist.After strip	
	    and etch the result were lines that ranged from wavy all the way	
	    to a dead short depending on the line spacing and severity of the	
	    lifting.		  					
	    We chased this on and off for over a year looking at everything	
	    from els.Cu surface topograhy to electroplating rack connections	
	    and everything in between.I looked at more SEM's than I care to	
	    remember.The good that came out of it was it helped us optimize	
	    our resist processing operations however the problem still	
	    remained;although to a lesser degree.			
	    The answer for us came from a change in the pattern plate 	
	    preclean soak cleaner,too much heat,time and solvent.As a test	
	    you can try bypassing it and seeing if the problem is reduced	
	    or goes away,however this may be tough to catch due to the 	
	    sporadic nature of the problem.				
	    The use of a less agressive cleaner cured the resist lift issue	
	    for our application.A switch to LP resist didn't hurt either.	
									
		Good Luck.						
									
						Regards			
						Michael Barmuta		
				 .		Staff Engineer		
						Fluke Corp.		
						Everett Wa.		
						(206)356-6076		
				
On Fri, 13 Sep 1996 05:24:53 -0700 Jim Moritz wrote:

> From: Jim Moritz <[log in to unmask]>
> Date: Fri, 13 Sep 1996 05:24:53 -0700
> Subject: Dry Film Breakdown
> To: [log in to unmask]
> 
> We are experiencing sporadic dry film breakdown using Dynachem HG 2 mil
> film. The laminators have
> been thoroughly checked out so we don't suspect them and. The problem we 
are
> seeing is what looks
> like a seeping under the film in copper plating. When the panels are
> completed the traces are
> somewhat irregular and not as crisp edged as normal. What is frustraing is
> that this happens so
> sporadically and may only affect a couple of panels out of a long run or 
all
> panels in a short run.
> 
> Any suggestions would be greatly appreciated.
> 
> Jim Moritz
> ES&D
> 
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