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A pressure between 375 to 450 pounds per square inch is applied, according to the fineness of the powder,
the amount of moisture it contains, the humidity of the atmosphere etc. The compression process lasts
about 30 to 40 minutes. The work is done slowly and the pressure is eased off and re-applied several times,
in order to get greater density without applying excessive pressures. As it happens, the edges of the cake are
always less compressed than the middle, because the powder layer can fall away around the edges. Therefore,
the sides of the cakes were cut off at about 1inch thickness on each edge and the center sections were used for
further processing.
The ideal average density for cakes produced by this process was somewhere between 1.7 and 1.8. The pressed
cakes were then taken to the next stage of the process, granulation