Disc filter bags are specialized filtration materials used in disc filters to separate solids from liquids. These filter bags are commonly employed in industries such as mining, wastewater treatment, and chemical processing. The filter bag is mounted onto disc segments or panels, which rotate within a slurry, enabling continuous filtration and efficient solid-liquid separation. Dewatering of mineral slurries can be achieved in a number of ways, among which disc filters account for the largest production tonnage. However, today’s high-performance rotary disc filters or hyperbaric rotary disc filters are heavily dependent on the appropriate filter bags.
- Material: Polyester (PE), Polypropylene (PP).
- Weaving Methods: Plain, Twill, Satin
Description
The Structure of Disc Filter Bag
- Filter media layer — made from woven fabric.
- Support mesh or scrim — provides mechanical strength.
- Seamed or welded edges — ensure leak-free sealing around the disc.
Working Principle
The vacuum disc filter is a solid-liquid separation device that uses vacuum as the filtering power to separate the slurry into solids and liquids. The machine adopts advanced technologies such as filter disc guide frame guidance, variable speed stirring, back-blowing unloading, automatic centralized lubrication, etc. It is a dehydration equipment with excellent performance and reliable use.
- Liquid slurry flows through the filter disc surface.
- Solids are trapped on the outer surface of the disc filter bag.
- Filtered liquid passes through the fabric and exits via the core or drainage system.
- When the filter cake builds up, backwashing or scraping cleans the disc surface.
Product Features
- High efficiency, precise filtration
Specially structured filtration technology, precise and sensitive performance, ensures that only particles with a particle size smaller than the required size can enter the system, and is the most effective filtration system; users can choose different filtration precisions according to water requirements, and can provide precision filtration up to 5μm.
- Wide adaptability
Can easily handle various industrial water, sewage, surface water, river water, well water and other water sources.
- Low consumption
High-speed and thorough backwashing, which can be completed in just tens of seconds. The backwashing water consumption is very small, accounting for only 0.5% of the water output; if combined with air-assisted backwashing, the self-consumption water can be reduced to less than 0.2%.
- Long service life
Good wear resistance and corrosion resistance, after years of industrial practical verification, the filtration and backwashing effects will not deteriorate due to the use time.
Disc Filter Cloth Selection
Fabric texture has elastic and groove structure.
- Groove structure increase surface friction can capture more solid.
- The groove structure has a guided liquid function, can extremely dry cake.
- Elastic can lead groove structure open in positive pressure, benefit to release cakes.
Material Performance Ccomparison
| Model | material | Weight (g/m2) |
Thickness (mm) |
Air permeability (l/m2.s) |
Breaking strength (N/5x20CM) |
Elongation (%) |
Density (pcs/10cm) |
weave | |||
| warp | weft | warp | weft | Peak. | Cont. | ||||||
| PP 750A | PP | 450 | 0.79 | 26 | 3104 | 2663 | 38 | 30 | 222 | 154 | PLAIN |
| PP 750B | PP | 517 | 1.27 | 30 | 2608 | 2050 | 35 | 28 | 256 | 151 | TWILL |
| PP 750BB | PP | 740 | 1.40 | 8 | 10115 | 3030 | 35 | 30 | 582 | 110 | SATIN |
| PP 750AB | PP | 650 | 1.30 | 20 | 7800 | 5200 | 26 | 20 | 450 | 170 | TWILL |
| PP 4212 | PP | 380 | 1.07 | 123 | 2972 | 1942 | 24 | 37 | 236 | 123 | TWILL |
| PE 8222 | PE | 700 | 1.5 | 8 | 720 | 450 | TWIL | ||||
Applications
- Mining: Separation of minerals from slurry in processes like iron ore filtration.
- Wastewater Treatment: Removing solids and debris from liquid waste streams.
- Chemical Processing: Filtering chemicals and solvents in industrial processes.
- Pulp and Paper: Dewatering pulp and recovering fibers.
Filmedia® — Everything You Need to Enhance Filtration Performance
Our disc filter bags are carefully engineered and precisely manufactured to ensure stable and efficient filtration performance even under heavy loads and demanding conditions. Each filter bag is custom-optimized according to specific application requirements, offering excellent temperature resistance, chemical durability, and mechanical strength. They are perfectly compatible with various vacuum disc filters and pressure filtration systems. Filmedia® disc filter bags deliver longer service life and higher filtration efficiency even in the most challenging environments.
