Plate Size
Once the cubic foot capacity of the filter press has been determined
from the press sizing calculator,
the next step is, the proper selection of the size of the filter plates, frame,
components and any accessories. Please review the press
sizing chart. This will allow you to see exactly where the cu. ft.
capacity fits in relation to the volume of each size press. For example a 5
cu. ft. can be sized as a 470 mm, a 630 mm and also an 800 mm. The size
selected is determined by the amount of expandability desired. After the
plate size is selected, there are many options from which to choose. The following information is a
summary of what needs to be considered in order to make the proper
selection, Please read each section in turn and note your requirements.
Plate Construction
Select the type of filter plate material. The standard material is an
industrial grade polypropylene. An optional FDA approved food grade polypropylene
material and a high temperature glass filled polypropylene material are
also available. Special materials are also available such as Carbon Steel ,
Stainless steel and Kynar. Contact us for availability
of special materials.
Plate Style
The standard is a 100 psi recessed gasketed plate with EPDM seals.
Viton seals are available as an option. Also available are non-gasketed
plates with quick removal latex edged cloths, where the cloth acts as the
gasket. The Non gasketed plates allow for easier change out of the filter
cloth, are lower in cost, but are not completely liguid tight during the
processing stage. Plate and Frame type plates are used in applications where filter
papers are preferred. Membrane filter plates have an inflatable bladder
that allows the filter cake to be squeezed to further dry the filter cake.
A “full pack” is where every plate is a membrane style and “mixed
pack” is where every other filter plate is a membrane style. Membrane
presses require an additional diaphragm power pack.
Optional Backing Plate
If a shorter cycle is desired, when running low volume applications for
example the capacity of the filter press can be temporarily reduced. This is done by moving the follower (tail) plate forward in the
plate stack next to a three button plate. The backing or "blank
plate" is then placed behind the follower plate acting as extra
support. The follower plate will not flex or break when used in this
manner.
Plate and Press Pressure Rating
The 100 psi design is standard for most dewatering applications and
will produce a cake with approximately 30-35% solids. A 225
psi design can be used to provide an increased yield per cycle.
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Cake Thickness
The 32 mm cake thickness is standard. Options include 25, 38 and 50
mm cake thickness. 25 mm would be used for high viscosity (slimy) materials
and 50 mm would be used for easily filtered material.
Cloth Type
There are four options for filter cloths to be used in the filter press.
PMU (5 micron) is standard in the press and is suitable with most
applications. The PSM material (50 micron) is for coarse filtration. The PMM
(10 micron) is a special fiber that resists oily and tacky solutions. The
FTW material (1 micron) is for high clarity applications. Check your
particle size and submit a sample of the material to us for testing to
determine which cloth will be suitable. How
big is a micron?
Frame Design
There are two different frame configurations. Sidebar, and a dual I-beam overhead design. The
standard design is sidebar construction. All presses up to 1000 mm come
only in sidebar design. The 1200 mm and the 1500 mm are available in both designs. 1500 mm x
2000 mm and 2000 mm size presses only come in dual beam overhead designs.
Automatic cloth washing is only available in overhead designs.
Volume of Plates/Expansion Spacer
All filter presses are available with optional removable expansion
spacer (the 630 mm and 800 mm presses also include built in a two-stage side-rail
design). On presses ordered with a spacer, the first number denotes current
plate capacity. The second number in the nomenclature is the maximum
capacity the frame will allow. The size of the expansion spacer is the
difference between these two numbers.
Pump Control
A pump controller loads the press filter cavities in a progressive
manner that improves the filterability, and ultimately the dryness of the
filter cake dramatically. This option is available on all filter presses.
Control Panel
On automatic closure filter presses (630 mm and larger) the control
panel can be mounted on the right side (standard) or left side (optional).
If a plate shifter is included with a press its operation is from the same
side as the control panel.
Discharge/Air Blowdown Piping
The discharge/air blow-down piping is available in either manual or in automatic operation in any of materials listed. The standard is Schedule 80
PVC with EPDM seals. An optional core blow-down is available to purge the
center feed line of residual fluid.
Feed Style
The feed style can vary for special applications such as pharmaceuticals
and some type of food processing. Center feed is standard, however under
these circumstances a
choice of any corner feed is available.
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