Basic Information - Liquid Filtration Primarily filtration involves the separation of two phases, solid and liquid normally from suspensions. Liquid filters are mechanisms which are used to remove impurities that occur in liquids. In order to achieve the filtration process, a suspension is passed through a permeable or porous filter media that lets the liquid particles pass through, while catching the larger solid particles that need to be removed. For the liquid to flow there must be a pressure difference that causes it to move through the filter. The suspension which passed through the filter media form the permeate flow-filtrate; while, the retained particles on a surface of filter media form a filter cake. The selection of filter media depends from the following parameters :
Characteristics of suspension (viscosity, concentration)
Characteristics of filter cake (porosity, specific area)
Study the process parameters like temperature, pH, particle distribution, chemical composition and feed flow rate.
Each application is carefully and individually assessed to ensure the correct balance of operational requirements. To explain the separation and cleaning behaviour of filter media additional characteristics must be considered :
Permeability - To control separation efficiencies and filtration capacity.
Surface finish - To yield good cake discharge.
Mechanical resilience - To maximize service life.
Dimensional stability - To ensure proper cloth fit and trouble free operation.
We are offering the following characteristics of filter media :
Composition - type of fibres polyester or polypropylene.
Processing type - woven or non-woven filter media.
Air permeability - at 200 Pa we are offering the filter media with air permeability 3-700 l/DM2min.
Thickness (mm) 1-3mm depend on a weight and composition of filtering material.
Tensile strength (N/5cm), measured in weft and warp direction with values 1000-5000 N/5cm.
Specific weight (g/m2), from 300-700 g/m2 depend of type of the filter material.
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