Reliably reducing emissions and ensuring compliance with dust emission limits are two key tasks in dedusting. Our high-performance filters meet the most exacting requirements when it comes to dedusting exhaust air and flue gas.
Meet strict emission limits
High separation efficiency
Low residual dust emission
High abrasion resistance
Good chemical resistance
Filter even the finest dust particles
Low pressure loss
The fibre coating of needlona® filter bags is applied to a strong supporting scrim, this makes the filter extremely compact, dimensional stable and mechanically resistant for long service lives under the toughest conditions. Depending on the flue gas cleaning method, the high-efficency filters media are enhanced with various finishes.
Advantages of needlona® at a glance:
needlona® filter bags from BWF Envirotec are used in many areas, such as the cement, waste, wood, chemical, pharmaceutical, food, metal and plastics industries or in power stations.
Particularly in industrial areas, fine dust can pose serious health risks, placing an enormous burden on both people and the environment. Lamination with a highly effective ePTFE membrane significantly increases filter media efficiency. Fine dust, measuring even in the submicron range, is thus already separated at the surface. Can be applied to needlona® needle felt and glass fibre fabric.
Even the finest dust particles are separated beginning at the surface
Lowest emission levels, with zero emission a near possibility
No dust penetration into the carrier material
Excellent cleaning properties due to smooth, anti-adhesive surface
Constant differential pressure
Constant gas flow rate
Long service life and high productivity
PM-Tec® filter bags from BWF Envirotec are used in many areas, such as the cement, waste, chemical, pharmaceutical, food, metal and plastics industries or in power stations.
Safety is our top priority. This is why BWF Envirotec pioneered then launched the first filter medium tested by DEKRA EXAM GmbH. ExCharge® filter bags are manufactured from antistatic needlona® filter media. Its resistance value is significantly less than 106 Ohm (measured according to DIN 54345 Parts 1 and 5). High-quality stainless steel fibres in the supporting fabric ensure the filter bags' safe discharge.
ExCharge® is available for polypropylene, polyacrylonitrile, polyester, m-aramide, polyimide, polyphenylene sulfide and polytetrafluoroethylene needle felts.
Protects against explosions by permanently discharging electrostatic charge
Permanently antistatic behaviour due to high-quality stainless steel fibres in the carrier fabric
ExCharge® filter bags from BWF Envirotec are used in the food, wood and chemical industries, for example, as well as in coal processing.
Producing foodstuffs entails strict hygiene rules. To ensure product purity, any filter bags used must be food safe. Our FoodTec® product line has been specially developed for applications in the food industry, and tested and certified by an independent institute.
Our test results lie far below legally permitted limits, confirming the outstanding properties and food safety of FoodTec® filter media. Compliance declarations are available for all PTFE, polyester and polypropylene FoodTec® needle felts.
FoodTec® filter bags reliably separate all particles, ensuring that the product remains pure throughout the production process.
Certified needle felt with compliance declaration according to Regulation (EU) No. 10/2011
Conforms to FDA 21 CFR §176 and/or §177
Manufacturing occurs according to GMP EU 2023/2006
Available as ExCharge®
FoodTec® filter bags from BWF Envirotec, for use in the food industry.
In terms of employee health, one can't take shortcuts when it comes to dedusting the workplace. By using needlona® filter media with a test certificate (PZ), the workplace itself can become a clean environment.
PZ test certificates from the Institute for Occupational Safety and Health (Berufsgenossenschaftlichen Institut für Arbeitssicherheit, IFA) are available for selected polyester needle felts.
Tested and certified by the Berufsgenossenschaftlichen Institut für Arbeitssicherheit (IFA) according to dust class DIN EN 60335-2-69 for use in workplace dedusting.
Specified for dust classes "L" and "M".
|Dust class DIN EN 60335-2-69||Application||Maximum admissible emission rate|
|L||dust separation with AGW values > 1 mg/m3||1,0 %|
|M||dust separation with AGW values ≥ 1 mg/m3||0,1 %|
PZ filter bags from BWF Envirotec are used wherever cleaned air is pumped back into the workplace environment, as well as in dust-removing machines and equipment such as dust extractors in the woodworking industry, industrial vacuum cleaners and mechanical sweepers.
In MPS® filter media microfibres significantly increase the filter area of the needle felt, resulting in the greatest possible fibre surface. This means even the finest dusts are effectively separated.
Highest separation efficiency due to a surface oriented filtration
Lowest emission values
Reduced cleaning intervals mean extended service life
Favourable operating costs due to reduced consumption of energy and compressed air
MPS® filter bags from BWF Envirotec are used e.g. in the cement and waste industry, as well as in power plants.
Both reverse air and jet pulse filter systems are used in asphalt mixing plants. BWF Envirotec's AsphalTec® filter media features a basis weight that is ideal for each of these systems. You can choose from weight classes beginning at 400 g/m² for reverse air and up to 550 g/m² for jet pulse filter systems.
Lowest emission values and long service life
Supporting fabric, homogeneous fibre layer and heat setting all ensure mechanical stability and resistance in the asphalt mixing plant
AsphalTec® Filterschläuche from BWF Envirotec are used in asphalt production.
All needlona® needle felts can be finished with a surface finish or protective treatment. This significantly improves service life, cleaning behaviour, dust cake formation and mechanical and chemical resistance. Protective treatment can be applied to all our product lines, in any number of ways.
Optimum surface filtration
Lower energy costs due to the needle felt's efficient cleaning properties
Improved protection against mechanical and chemical influences
Increased economic efficiency due to extended service life
Abrasive dust can do mechanical damage to the filter bag, shortening overall service life.
Fibre impregnations with silicone oil give needlona® needle felt anti-adhesive properties. These properties reduce fibre wear from abrasive dusts many times over.
All needlona® needle felts can be given an anti-adhesive finish. Depending upon the type and characteristics of the dust, we recommend Code9, Si or x-surf single fibre impregnation.
Reduces fibre wear
Facilitates cake release
BWF Envirotec filter bags with finishes for abrasive dusts are used, for example, in the lime, gypsum and cement industries.
Agglomerating dusts can be found, among others, in combustion or drying processes.
CS18® plus: A highly effective, concentrated application of PTFE polymers to the needle felt surface gives it excellent cleaning properties. This anti-adhesive surface coating reduces the adhesive forces acting between the filter medium and the dust cake, improving cleaning properties and creating low Δp behaviour in the filter system.
Especially with agglomerating dusts, additional calendering and/or a smoothed surface makes for excellent dust cleaning characteristics. Glaze thus leads to reduced pressure loss.
Microporous and anti-adhesive
Causes low Δp behaviour
Extends the service life of the filter medium
Improved cleaning properties
Reduced pressure loss
BWF Envirotec filter bags with finishes for agglomerating dusts are used in the chemical and pharmaceutical industries, in the cement, lime and gypsum industries, in the food industry, in waste incineration plants and in biomass thermal power stations. Needle felt treated with glaze is also suitable for use in CIP systems.
Especially during metallurgical processes hot, partially glowing particles may come into contact with the filter bag. Our FireGuard and BlockGuard product series protect against these forms of dust.
FireGuard is a high-tech p-aramid surface finish that increases resistance to flying sparks. FireGuard also offers excellent resistance to abrasion and mechanical wear.
BlockGuard consists of a layer of spark resistant Preox fibres. It is mainly used on polyester needle felt, and presents a solution for occasional sparks that may occur in the raw gas flow of the filter system.
Excellent protection against flying sparks
Thermally resistant even at high contact temperatures
Extended service life
Basic protection for occasional flying sparks
Very good price/performance ratio
Excellent pressure loss
BWF Envirotec filter bags with finishes that protect against flying sparks are used, for example, in the metalworking or the non-ferrous metal industries.
Needle felts can also be processed with a surface finish from our CS product line that protects against acidic and alkaline dusts.
Oil- and water-repellent impregnation provides additional protection against acids. CS29® is a finish that provides excellent protection for the needle felt against acids, alkalis and hydrolysis.
What's more, CS29® features outstanding oil and water repellency.
CS52 is a protective finish against acid, alkali and hydrolysis for m-aramid filter media that repels dust, oil and water. An additional PTFE-based anti-adhesive finish improves dust separation properties.
Oil and water repellent
Excellent protection against acids, alkalis and hydrolysis
Excellent protection against acids and alkalis
Improved protection against hydrolysis
Higher separation efficiencies
BWF Envirotec filter bags with finishes to protect against acidic and alkaline dusts are used, for example, in the gypsum, lime, clay and cement industries.
CS17® is an oil- and water-repellent fibre impregnation that is based on fluorocarbon resin. It reduces the level of moisture that penetrates the needle felt, thus reducing the risk of excessive dust deposits and caking.
CS30® PTFE fibre impregnation is used to filter fine, well-adhering dusts. Its PTFE properties make it both extremely durable and chemically resistant. CS31® is a combination of CS30® with a CS17® finish. It is also water- and oil-repellent. It also protects the needle felt from moisture and condensation.
Oil and water repellent
Greater safety in discontinuous processes
Higher separation efficiencies
Lowest emission values
BWF Envirotec filter bags with finishes for moist, oily and sticky dusts are used e.g. in the lime, gypsum and cement industries, non-ferrous metal and steel production, food industry as well as in thermal waste treatment.