We would like to receive input on the positive and negative aspects 
of horizontal etching with oscillating spray bars, versus vertical 
etching of inner layers and outer layers using an alkaline etchant.

We would like to hear of experiences as to which method provides 
the best results in terms of line width uniformity, top to bottom 
consistency, and conveying of cores as thin as .004 with half ounce 
copper on both sides. 

Panel sizes vary from 12 X 12 to 21 X 30. Line and spaces down to 
.004 X .004 for the smaller panels, .008 X .008 on the larger panels. 

Please presume that equipment of either type is well maintained and 
that the chemistry is under good control. 

Many thanks,

Luis Rivera
CompuRoute, Inc.
Dallas, TX
[log in to unmask]
(214) 340-0543

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