Filter press cloth is designed for filter press filters. The filter plates and filter frames are arranged alternately, and the filter cloth is overlaid on both sides of the filter plates. It is mainly used in sludge dewatering, chemical, mining, food and other industries.
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The main materials used for filter press cloth are polypropylene (PP), polyester (PET), and polyamide (PA), each offering different filtration performances:
1. Polyamide material is resistant to acids but not alkalis, has higher strength compared to other materials, has good abrasion resistance, it has excellent abrasion resistance properties.
2. Polyester material is resistant to acids and weak alkalis, with strength and abrasion resistance ranking just below nylon. It has good heat resistance and higher chemical stability but is susceptible to hydrolysis in strong alkalis.
Polypropylene material has strong acid and alkali resistance, excellent strength and abrasion resistance, and good chemical stability.
Material
Weight
（±5%）
Air Permeability（L/㎡ S±20%）
Thicknes
（mm±10%）
Polypropylene
310
160
0.49
Polypropylene
800
300
3
Polypropylene
640
100
1.15
Polypropylene monofilament
380
80
0.63
Polypropylene monofilament
400
50
0.61
Polypropylene multifilament
680
38
1.28
Polypropylene multifilament
625
15-20
1.1
Polyester staple fiber
340
35
0.65
Polyester staple fiber
520
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15
0.9
Polyester staple fiber
700
0-3
0.63
Polyester staple fiber
250
15
0.6
Polyamide multifilament
283
0.55
Polyamide monofilament Multifilament
700
200
1
Polyamide monofilament
670
300-400
1.16
Polyamidemonofilament
450
0.55
Different materials and models of press filter cloths vary in air permeability, pore size, thickness, and weight. If you have any doubts about selecting the right model for your filter press, it is recommended to consult a reputable filter cloth manufacturer.
Bolian has extensive experience in producing filter press cloths, and provides customers with various choices including different types and dimensions. We develop and manufacture customized filter cloths according to different working conditions. Bolian filter press cloth is designed to meet filtration needs, including materials, yarn types, weaving processes, and surface treatments.
Bolian provides various filter press cloth products including the barrel neck, hanging, and recessed types. We offer a wide range of filter press cloth with different air permeability based on specific filtration requirements. We provide customized filtration solutions with the support from technical consultancy, design, manufacturing to installation.
The filter cake will begin to become wet, slimy and not as dry. This is your indicator that the cloths need to be cleaned. (see number 5 for cleaning info). If you have already cleaned your cloths and your process has not changed but you are still getting slimy filter cake, it may be time to replace your cloths. Cloth life varies from installation to installation and depends on such variables as frequency of cycles, proper cleaning and maintenance and the type of sludge that is generated. Generally speaking for most installations cloths can last up to 6 months at the most.
Expansion depends on a couple of factors. First, if your press is already expandable, meaning you’re your press has a distance piece for expansion to a larger capacity, all you need to do is unbolt the distance piece and add additional plates in the 1-3 button sequence taking care that you add plates in even numbers. However, if you have a Met-Chem press or your press has notched and bolted sidebars, then it can also be expanded by removing the sidebars and replacing them with longer sidebars and installing additional plates. Please note that when adding plates, you must be sure to add them in the 1-3 button sequence in order to provide proper drainage.
There are several possible causes. You might not have the proper cloths for you application or if you have been using the same cloths for an extended amount of time, you may have holes in the filter cloths. The gasketed cloth may have slipped out of the grooves. Or, perhaps, the cloth on the head plate may not be properly secured.
Precoat and bodyfeed are two related applications. Both of these special applications use diatomaceous earth (commonly known as D.E.), cellulose, perlite or fly ash, as a filtering aid when the solids in a slurry are extremely fine and free-filtering. The filter aid helps to trap the fine solids that otherwise might flow through the filter cloths. The processes of precoat and bodyfeed increase the clarity of the filtrate, provide for higher flow rates, more consistent runs, shorter cycles, dryer cakes, better cake release, and also help to protect and increase the life of the filter cloths.
The precoat process is performed before the slurry is pumped into the press. A precoat system consists of a tank, mixer and pump. The filter aid is mixed with water in the precoat tank. It is then pumped into the press where it coats the filter cloths. The filter aid rather than the filter cloths becomes your initial filter media.
During a body feed the filter aid mixes with the slurry in the holding tank prior to being fed into the filter press. The filter aid becomes part of the slurry thereby providing a better filter cake.
If you have not made any recent changes to the plate stack (which is the number one reason this might occur), there are several possibilities.
You could have a build-up of solids on the sealing surfaces which will then need to be cleaned.
Check to see if the hydraulic pressure is set to the recommended specifications. If not, make the appropriate adjustment.
Another possibility is that there could be a wrinkle or hole in the filter cloth or the gaskets may be loose.
If you continue to have problems, contact your Met-Chem representative.
It’s a good idea to change your gaskets whenever you change your filter cloths. Also, if you are getting excessive leakage out of the press while maintaining correct hydraulic closure pressure, this may be a sign that it is time to change your gaskets.
Gasket life will depend on many factors, such as length of filtration cycle, temperature, and excessive closing force. Gasket replacement should take place if the gasket appears to be delaminating or shredding. Also, if excessive temperatures exist and cycles are very long, the standard gasketing material may go into additional cure, causing it to harden slightly. If you continue to have a problem, contact your Met-Chem representative for an alternative.
If the press is leaking (around the locknut on the 470mm size or from the bottom leg drain holes on 630mm and larger size presses) during the start-up of the feed process, the problem is usually leakage past the center feed quad ring seal. The quad ring may not seal for several reasons.
First check for the cause:
Did the locknut on the outside of the press head loosen during shipment? If so, tighten the locknut using a spanner wrench, pliers, or pipe wrench.
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