36
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 come through a
smeared area of a wedgewire screen. If it becomes an issue, it is corrected by
running a box cutter blade through the slots.
The screen of a Series KP 6" through 16" press is removed from the cake
discharge end of the press. To remove the screen, follow these steps:
• Remove the outboard bushing tailstock assembly.
• Remove the discharge cone and its actuator mechanism. (Be careful not to
pinch a finger when removing the lever arm mechanism.)
• Remove the resistor tooth bar.
• It may help to loosen the bolts holding the clamshell closed.
• Remove the bolts holding the cake spout assembly to the C Plate, and remove
the spout.
• Pry and slide out the Screen Assembly.
• In the case of a perforated screen, pry the screen sleeve from its assembly. To
do this, it is likely that wedges will have to be used to open the clamshell.
When tightening a new perforated screen sleeve into a clamshell fixture, be sure
not to tighten beyond the point where the sleeve starts to buckle or bend inward.
You want it tight as possible, but not tight enough to beer-can the screen. When
changing to different gauge thickness of screens, shims may have to be added or
removed from the clamshell joint.
Replacement thin gage screens are provided 1/4" long. This allows 1/8" at either
end to be peened over. The resulting 1/8" flange both helps hold the screen in
place and prevents the screen from being snagged by the screw.
Excessive rubbing between a screw and the screen can be corrected by grinding
the interference off the edge of the screw. Prussian Blue, applied to either the
screw or the screen, can be useful.
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