the flight; then subtract the thickness of the wedgewire (generally either 0.250" or
0.375") from the measured depth in order to calculate the clearance.
Perforated screen installations - a depth gauge can be used to measure the screw-to-
screen clearance. This is done by first finding an area where the screw flight is next
to the screen; poking a straightened paper clip through the screen is handy for this
purpose. The depth from the outside of the screen to the edge of the flight is
measured, and then the thickness of the screen is subtracted from that measurement.
[3/32" perf is 0.075" thick; 0.050" perf is 0.048 thick; 1/32" perf is 0.024" thick;
0.023" perf is 0.018" thick; 3/8" perf back up screen is 0.120" thick.]
If a screw rubs against the screen in a given area, it may be best to grind some off the OD of
the screw. Prussian Blue can be useful in finding the spot that is rubbing.
Screen Removal and Replacement
Wedgewire screens in Vincent presses can be reversed in order to achieve double life. That
is, wear starts at the cake discharge end of the press. When this occurs, the screen can be
turned 180
o
so that the fresh inlet section is then in the discharge area.
In the case of screen failure, frequently a solid patch can be welded onto the screen, from the
outside. This is simple as the screen need not be removed from the press.
Wedgewire screens may become smeared from being wiped by the screw or by hard press
cake. Wedgewire screens generally work satisfactorily with 30% or even more of their
surface smeared over. Usually press liquor will not come through a smeared area of a
wedgewire screen. If it becomes an issue, it is corrected by running a die grinder blade
through the slots.
The clamshell screen of most Series KP 6" through 16" presses is removed from the cake
discharge end of the press. To remove the screen, follow these steps:
Remove the outboard bushing tailstock assembly.
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