What is filter press cloth? What is the purpose of filter press cloth?

Definition of filter press cloth

Filter press cloth is the core filter medium of filter press equipment, which realizes solid-liquid separation through physical interception and osmotic separation. It is made of fiber material woven or non-woven by a specific process, has a precise pore structure, and is widely used in efficient separation operations in chemical, mining, environmental protection and other fields.

I. Technical characteristics analysis
 1. Material system
 - Polypropylene (PP): acid and alkali corrosion resistance (pH 1-13), applicable temperature ≤90℃, economical choice
 - Polyester (PET): high strength and wear resistance, temperature resistance of 130℃, and resistance to weak acid environment
 - Nylon (PA): super wear resistance, outstanding alkali resistance
 - Aramid (PPS): high temperature resistance up to 190℃, strong oxidation resistance
 - PTFE coating: chemically inert surface, resistant to strong corrosive media
 2. Structural parameters
 - Weaving process:
 - Monofilament structure: smooth surface (Ra≤3μm), porosity 35-45%, easy to peel filter cake
 - Multifilament interweaving: three-dimensional filtration network, interception accuracy 1-50μm
 - Non-woven composite: gradient filtration layer, dirt holding capacity increased by 40%
 - Pore characteristics: nominal pore size 5-200μm controllable, Bubble Point method detection
 - Air permeability: 20-500 L/m²/s@200Pa, negatively correlated with filtration efficiency
 3. Performance indicators
 - Tensile strength: warp ≥1200N/5cm, weft ≥1000N/5cm (GB/T3923.1)
 - Elongation: <15% @ breaking load
 - Pressure resistance: withstand 0.8-2.5MPa filtration pressure
 - Water permeability: ≥0.8m³/(m²·h) @0.3MPa

II. Application scenario analysis

III. Technological innovation trends
 - Smart filter cloth: Implanted fiber optic sensor to monitor the degree of blockage in real time
 - Self-cleaning surface: TiO₂ photocatalytic coating reduces organic matter adhesion
 - Gradient density structure: Dynamic adjustment of filtration accuracy (5-100μm adjustable)
 - Renewable design: Use thermal disassembly technology to achieve material recycling rate >85%

The technical selection of this special textile needs to comprehensively consider material properties (particle size distribution, viscosity, temperature), process parameters (pressure cycle, production capacity requirements) and cost constraints. It is recommended to determine the optimal parameter combination through laboratory filter press testing. Regular use of pore size distribution analyzer and electron microscope for performance evaluation can extend the service life by more than 30%.