The stencil printing of solder paste is affected by a large number of
factors, including printer settings, stencil aperture geometry, and en
vironmental conditions. A fractional factorial experiment was designed
to determine the effects and interactions of some of these parameters
. A two-level design on eleven factors was used, with all main effects
, two-way interactions and most three-way interactions estimable. The
height of the solder paste deposit was measured at certain points on e
ach of sixty-four boards. These measurements were analyzed using ANOVA
and ANCOVA, and the most significant factors and interactions identif
ied.