SLS
p r o c e s s
1 4 1
I R S & I P C
u s e r ’ s g u i d e
h o w t h e I R S & I P C w o r k
Blender bin
This Blender bin in the right front corner of the
IRS blends a batch of powder and stores it until it
is fed to the SLS system(s). A load cell and a level
sensor monitor the Blender bin level. When the
powder weight drops below the falls to a
predetermined low level, a blend cycle is
initiated. All other operations cease during
blending. This means that the IPC will not load,
the IRS will not accept used powder from the BOS
and the LS machines will not be fed powder until
blending is complete.
Blending will not start until a sufficient quantity
of both used and virgin powder is available to
satisfy the desired percent virgin (user-settable at
the IRS UI). Once this has been checked and
satisfied, the IRS will begin blending by
transferring a load of whichever powder makes
up the majority of the batch. Following this, at
the end of each transfer (whether of Virgin or
Used powder) the IRS calculates the current
percent virgin based on weights transferred so
far. If the percent virgin is above the final desired
percent, it transfers a load of used powder. If
below, it transfers a load of virgin. The weight of
powder transferred with each load varies
somewhat and it is different between the used
and virgin bin due to the slightly different flow
properties of each material. In addition, the
desired ratio of virgin to used powder may not be
1:1. Therefore, the powder proportioning does
not always alternate one load of each powder
type.
At the end of the proportioning, the last load may
be greater than the final weight of powder
needed to arrive at the percent Virgin needed for
the entire batch. Therefore, it transfers only the
required weight to the blender and returns the
excess powder in the transporter to the bin it was
originally fed from. This ensures that the final
blend will be the desired percent Virgin.
Once the blender contains the desired amount of
Used and Virgin powder, the bin contents are
thoroughly mixed by circulating the powder from
the bottom to the top of the bin using the right
transporter system. Internals in the bin enforce a
velocity profile in the bin that essentially fold the
powder over itself as it flows through the bin. The
number of circulation cycles is set in software.
Blend cycling continues until the weigh cell and
the level switch signal a full bin.
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