Best described as the shape of the sand that is left on a beach after a sand filled plastic bucket has been turned
upside down and removed. This shape is predominantly used in the stencil manufacturing industry for describing
the cross section of an aperture that is used for depositing solder paste and its release onto a PCB that will be
used for taking electronic components prior to reflow. Trapezoidal apertures are best produced for stencils by PCM,
by making a mirror image double sided photomaster that has one of the pieces of film with compensations on that
allow an angle to be etched in the profile, thereby allowing the solder paste easy release.
Trapezoidal Etch
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