PTFE Polyester Needle felt Filter Bags

Polyester filter bags are one of the most popular types of filter bags. They're made by laying polyester staple fibres into a fibre net, then reinforcing the net into a cloth with a barbed needle. The fibres are pierced repeatedly to reinforce the fabric, forming a needle-punched non-woven fabric. Finally, the film is laminated to create a PTFE polyester needle-punched felt filter bag. Nonwoven fabrics without warp and weft, fibre miscellaneous, warp and weft performance don't have much differences . The air permeability of polyester filter bags is more than 50% higher than that of ordinary calendered filter material, with a smooth surface, good air permeability and low resistance.

PTFE Polyester Needle felt Filter Bags are a great choice for high-efficiency filtration. After needling, they go through heat setting and other treatments, which gives them the best of both worlds: good air permeability, a smooth surface, and they're not easy to deform or clear dust. In real use, the polyester needle-punched felt filter bag also shows great resistance to wear and tear, winding and folding, and it's much stronger mechanically. This means that the initial resistance of the dust collector and operating resistance are reduced, which improves the filtration efficiency. The temperature resistance of this filter bag is better, with a use temperature of generally between 130-150 degrees Celsius, and the instantaneous temperature can reach 150 degrees Celsius. However, if you go over this temperature, it can cause the filter bag to deform or burn. This filter bag also lasts a pretty long time, usually between 4 and 6 months.

Filter bag selection

When it comes to PTFE Polyester Needle felt Filter Bags, the fibre density of the bag affects the entire PTFE-coated dust filter bag in terms of physical properties, style, feel and so on. What exactly is fibre density? Fibre density is basically the thickness of the fibres.

So, how much PTFE-coated dust filter bag fibre density is good? The air permeability of a filter bag depends on the size of the fibres. This is an important technical indicator of the bag's filter media, so we choose the fibre density to meet the amount of air permeability of the filter media as a prerequisite.

If you need to coat, we can use 600g/m², 700g/m² or less weight needle felt. PTFE film acts as the "primary dust layer", and material exchange is done on the film surface. This means the film starts to filter effectively straight away. So, once the felt is laminated, it just acts as a carrier for the membrane, and using even more felt won't affect the air permeability.

Although PTFE has some special properties, the amount of fibres used in the filter media is also down to the design requirements. If you don't need the bag to be coated, we'd recommend using fine fibres to make sure the filter media is tight and the filtration is efficient.

We can analyse and adjust the fibre density of the dust bag to suit different working conditions, so that it's easy to get air through and the dust is removed effectively.

Filter bag advantage

PTFE Polyester Needle felt Filter Bags are a new type of filter material made from a layer of polytetrafluoroethylene (PTFE) film on top of ordinary filter material. The film's unique three-dimensional mesh structure means that dust can't pass through, so there's no need to worry about pore clogging. So it reduces dust emissions. This is surface filtration. Coated filter media can achieve near-zero emissions, and because the film isn't sticky, the friction coefficient is small, so the powder cake will automatically fall off. This ensures that the equipment resistance is stable for a long time, so it's the ideal choice of filtration materials.

1. Usually, the filtration method used in industry is deep filtration, which forms a dust layer on the outside of the filter bag and is useful for filtration. The filtration process takes a long time to start filtering, about 10% of the whole process. It's pretty resistant and doesn't filter much, and it has a high back pressure when it's filtering and blowing. It also uses a lot of energy and doesn't last long. It's big and covers a lot of area. The PTFE Polyester Needle felt Filter Bag is outside filtration, so dust can't get in. It's very effective at blocking dust, whether it's coarse or fine. There's no initial filtration period, so it's always in use. It's very efficient, filtering almost 100% of the time.

2. Long life. No matter what kind of clearing mechanism is chosen, the PTFE Polyester Needle felt Filter Bags can show excellent performance, and it is a kind of filter material that can completely show the filtration function of the dust collector planning function. Therefore, the cost is low. Coated filter media is a kind of soft but not lose the strong structure of the organisation, there is enough mechanical strength, coupled with outstanding desliming, down the intensity of ash removal, in the low and stable pressure loss, can be used for a long time to extend the life of the filter bag.

3. Low pressure, high flux continuous operation. Traditional deep filtration filter media, once put into use, dust penetration, set up a dust layer, air permeability will be agile decline. Filtration, the internal accumulation of dust to form a blocking phenomenon, and then increase the resistance of the dust removal equipment. PTFE Polyester Needle felt Filter Bags with fine aperture and its viscosity, so that the dust penetration rate is close to zero, put into use to provide the best filtration power, when deposited in the film filter media on the outside of the filtered material reaches a certain thickness, it will be actively dropped, easy to clear, so that the filtration pressure has been maintained at a very low level, the air flow has been maintained at a high level, can be operated successively.

4. Simple ash removal. Any keep a kind of filter media operating pressure loss depends directly on the amount of dust remaining or staying on the exterior of the filter media.PTFE polyester needle-punched felt filter bag only need a few seconds to clear the ash, so it has very good characteristics of clearing the ash, each time the ash can be completely removed from the layer of dust, the interior of the media will not form a clogging, will not change the porosity and mass density, and can often be maintained in the low-pressure loss of operations.

Product parameters