When to Use filter cloth for filter press？

Filter cloths provided with the filter press have been selected specifically for use on each particular application. Proper care and maintenance of the filter cloths are important to the performance of the filter press.  During filtration, the filter cloth is the initial barrier that separates solids from the liquid. Therefore, the filter cloth must remain porous to provide high filtration rates.

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During normal operation, the filter cloth may gradually become plugged with microscopic particles.  These particles penetrate the cloth and become lodged in the depth of the weave, which leads to decreased filterability.  These particles must be removed periodically to maintain high filtration rates and drier cakes.

Filter cloth washing is required when one of the following factors indicate plugging has occurred.

1. Initial high filtration pressure
2. Long filtration cycles.
3. Wet filter cakes

There are several methods used to wash the cloths while they are installed on the press.  The most commonly used method with metal finishing sludge is acid washing, which requires the following:

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Filter cloth life is shortened by mechanical damage which may be caused by chemical attack, mechanical abrasion, or both. Cloth life is also shortened when the material being filtered clogs or blinds the filter cloths, impacting porosity and no longer allowing the filtrate to properly flow.

There are many factors affecting cloth performance including:

• Application
• Material being filtered and the nature of the slurry, e.g. whether the particles in the slurry are coarse or dense
• Operating conditions
• Effectiveness of cake discharge mechanisms
• How frequently and effectively you are cleaning your filter cloth

Even filter cloth that is the correct design for your operating conditions will eventually have to be replaced. Timeframes can vary significantly depending upon the aforementioned factors.

Some telltale signs that your filter cloth may need replacing include:

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• Your filtration cycle times are getting longer
• Your filter cake has become progressively wetter and sloppier and is insufficiently dry/solid
• You see impurities in the filtrate, i.e. the filtrate is no longer clear
• You see holes in the filter cloth