Rick:Your LPI mask is under tack cured,there's still solvent in it.	
	Try raising your oven temp up to 200-208F.You may want to try	
	approaching this in 5F jumps.You probably also need to reduce your	
	dwell time in the oven by 25-35%(the higher the tack temp the less	
	time in the oven).I'm assuming you are using a conveyerized tunnel	
	oven and the 68 minutes is the time "in the box".One word of caution	
	it's a fine line balancing act between fully tacking the mask to hold	
	webs and eliminate mask on the phototools vs. locking the mask in on	
	pads and holes.Don't go too far.You should also bring in your 	
	friendly Dexter Hysol rep to help.Good Luck!			
									
						Regards			
						Michael Barmuta		
						Staff Engineer		
						Fluke Corp.		
						Everett Wa.		
						(206)356-6076	 	
							


On Mon, 16 Dec 1996 10:00:04 -0800 RICK TAORMINO wrote:

> From: RICK TAORMINO <[log in to unmask]>
> Date: Mon, 16 Dec 1996 10:00:04 -0800
> Subject: diazo problems during lpi imaging
> To: [log in to unmask]
> 
> I am having 2 problems with our diazo artworks during lpi imaging.
> 
> After as few as 10 exposures, the film starts to develop a white haze (a
> "ghost" circuit image) on the emulsion side.  If caught soon enough, it can
> be fairly easily wiped off.
> 
> The other (more serious) problem is uncured ink from the board's holes
> depositing on the artwork.  I either need a way to prevent this, or an easy
> way of removing it from the film (film cleaner works marginally ok).
> 
> Here are the facts:  We use Duratool film from Rexham Graphics.  We have a
> Technilith ammonia developer from James River running at 155 degrees.  Our
> uv density readings are around 4.6.  Our lpi is Dexter Hysol SR8100R
> (SR8300).  We tack cure the lpi at 188 degrees for 68 minutes.
> 
> I'm sure you need more facts (nobody ever gives enough), so lay 'em on me!
> 
> Thanks in advance,
> Rick
> 
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