The figures below shows a work piece detail of approx. 1mm x 3mm x 0,1mm.
A metal sheet is cut to an optimal size - typically 300mm x 600mm and chemically cleaned.
We laminate with a UV sensitive etch resist on both sides.
The etch resist is exposed to UV light through a double sided photo mask (transparent with dark areas).
The figure shows both sides of the workpiece detail.
The UV light absorbtion polymerizes the etch resist (darker colour).
The un-polymerized resist is removed in a developer.
All details are simultaneous etched to specified dimensions - widths and debth.
Finally the etch resist is stripped off and the flat parts are completed.