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Dec 28, 2023
Filter fabrics can be made from a variety of materials depending on their use, mainly classified into two categories:
Natural Fibers: Cotton, hemp, wool, etc., suitable for low-corrosion and low-temperature environments (e.g., food filtration).
Synthetic Fibers:
Polyester (PET): Acid and alkali-resistant, wear-resistant, suitable for chemical and mining industries.
Polypropylene (PP): Acid and alkali-resistant, lightweight, commonly used for wastewater treatment.
Nylon (PA): High strength and impact resistance, ideal for fine filtration.
Aramid (Nomex): High temperature resistance (over 200°C), used for high-temperature flue gas filtration.
PTFE (Polytetrafluoroethylene): Highly resistant to corrosion and high temperatures, used in extreme environments.
Mining: Ore dressing, tailings dewatering.
Chemicals: Acid and alkali liquid filtration, catalyst recovery.
Food: Clarification of edible oil, liquor, and fruit juice.
Environmental Protection: Wastewater treatment (filter press cloth, belt filter cloth); air purification (dust filter bag).
Medical: Liquid filtration in pharmaceutical processes.
Air Permeability: Affects filtration efficiency, determined by pore size and fabric structure.
Temperature Resistance: Synthetic fibers generally resist temperatures from 60°C to 260°C, depending on the material.
Chemical Resistance: Materials like PTFE can withstand strong acids and alkalis.
Mechanical Strength: Tensile strength and wear resistance determine service life.
Filtration Precision: From micron to millimeter scale, suitable for different particle sizes.
Filtration Goal: Particle size, temperature and pH.
Equipment Type: Different filter fabrics are required for press filters, centrifuges, vacuum filters, etc.
Cost Considerations: High-precision or specialty materials are more expensive, requiring a balance between performance and budget.
Service Life: High wear environments require durable materials (e.g., polyester with coatings).
Clogging: Regular backwashing or chemical cleaning (e.g., soaking in diluted acid).
Damage: Avoid mechanical damage, check the strength of fabric seams.
Efficiency Decrease: May occur due to fiber aging, requiring periodic replacement.
