Sometimes resistor teeth are bent by tramp material so that they are hit by the screw flights.
Grinding a little off such a tooth with an angle grinder is an acceptable alternative to trying to
straighten a bent tooth.
Screens
The screen of the press is made either of wedgewire or profile bar (slotted screen) or
perforated stainless sheet (round holes).
Perforated Screen Assembly
Profile Bar / Wedgewire Screens
Screens made of wedgewire come standard with 0.015" to 0.020" slot width; they are also
available with slots that are 0.006" to 0.060" wide. With slot widths less than 0.012" there is
a tendency for the screen to blind (be covered over) with the material being pressed.
However, they work well in alcohol and oil separation. Changing the slot width generally
has little impact on the clarity of the press liquor or the dewatering capacity of the press.
These screens are reversible as most wear will occur at the discharge end. This doubles the
life of the screen. When worn, the screen may be patched or the entire wedgewire assembly
must be replaced.
Perforated metal screens are usually a simple sleeve made from rolled perforated plate which
is held in the screen assembly. These are less durable but usually only the inner screen, the
screen insert, must be replaced, reducing cost.
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