 |
||||||||||||||||||
Stencil, Solder Paste & Printing Defects - Stencil Blockage The example shows an aperture blocked after laser cutting of a stainless steel stencil. The stencil has been completely cut by the laser, but the cut block has not separated cleanly from the aperture leaving it blocked. During the printing process, the pad was consistently not printed on test boards. When the stencil was inspected, the blockage was discovered. This not a regular problem, but it can occur in practice, particularly on ultra small pads. The example was being used to bump flip chip dummy components.
More Stencil, Solder Paste & Printing Defects:
Text and photos courtesy of Bob Willis |
