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Subject:
Re[2]: C A Picard Exposure Frames
From:
"MARK DOWDING" <[log in to unmask]>
Date:
Wed, 02 Oct 96 12:32:50 PST
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     Definitely not on every panel, for exactly the reasons you 
     describe.  One step is taken on the first panel/layer for every 
     job, to determine proper exposure.
     
     A good developer filtration system will help (although not 
     eliminate) redeposition of partially polymerized resist.  
     
     Trimming the step tablet to the minimum exposure range also 
     reduces the amount of unwanted resist.
     
     Mark Dowding
     Multek, Irvine


______________________________ Reply Separator _________________________________
Subject: Re: C A Picard Exposure Frames
Author:  [log in to unmask] at INTERNET_GATEWAY
Date:    10/2/96 12:16 PM


     
     
>     IMO, once per day or even once per shift is not frequent enough.  
>     There are too many variables that affect exposure; hold times 
>     after lamination, artwork density, developer changes, just to 
>     name a few.  We take our steps on every job.
     
By every job, do you mean on every panel? Remember that step tablets result 
in partially polymerized resist which can come off the board and contaminate 
your developer solution. You should keep the number of tablets run to the 
minimum necessary to avoid redeposition of resist particles.
     
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