Baumfolder Flexifold: 1st Station (from 2005) - Manual (Page 44)

PAGE 44 TP10494A
If the channel is angled to produce a downward pressure,
and two folding rollers, spinning as indicated, are placed close
to the end of the channel, the larger buckles that start forming
there will always be formed downward and be pulled into the
rollers, compressing into a fold.