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Nanofiber Filter Media for Engine Air Intake Filtration

The finest fibers for high performance

Nanofiber filter media from MANN+HUMMEL sets new standards for commercial vehicle air filters. It offers an extremely high dust separation efficiency of up to 99.99% for the separation of particles together with low flow restriction and a long service life.

nanofiber-filter-medium.jpg Nanofiber filter medium before and after loading with dust particles under real conditions (field test).

Combustion air always contains particles which should not be allowed to penetrate the inside of the engine. The application of a highly efficient air filter is therefore essential in order to protect the engine and its components such as the turbocharger or mass air flow sensor against increased wear and defects caused by dirt particles.

MANN+HUMMEL develops nanofiber coated filter media for the highly efficient separation, also amongst others, of fine particles. These filter media from MANN+HUMMEL are characterized by a verifiably higher separation efficiency along with the high dust holding capacity.

A high-tec nanofiber coated filter media from MANN+HUMMEL is the first choice for vehicles which work in environments with a high level of soot or fine dust pollution. Typical application areas here are dusty construction sites, mines and car rallies.

Good particle separation performance along with low flow restriction

nanofiber-media-ISO-5011-separation-performance.jpg ISO 5011 separation performance tested with ISO fine test dust (ISO 12103-01: A2). Results from filter elements with same size under typical conditions for heavy duty engine air intake. Separation performance changes with the changed test conditions (filtration velocity).

MANN+HUMMEL has successfully used nanofiber technology for a number of years in series applications for the commercial vehicles sector. The nanofiber filter media consists of a carrier media and an extremely thin layer of ultra-fine polymer fibers. The fibers with a diameter of less than one micrometer are approximately 200 times smaller than the fiber diameter of the carrier material. This leads to a considerable improvement in particle separation. At the same time nanofibers offer a further advantage: In spite of the high separation efficiency, the flow restriction remains very low. 

A comparison of the nanofiber filter media to the carrier material on its own demonstrates the performance which nanofiber technology offers filters. In the test of filter elements according to ISO 5011, nanofiber filter media retained up to 10 times more dust compared to the carrier material on its own. Standard media made from cellulose enable the separation of 99.9% of the total mass of dust particles in the air.  The closely meshed nanofiber layers allow separation efficiency to rise to 99.99%.

nanofiber-medie-flat-sheet-test.jpg Flat sheet test with ISO fine test dust (ISO 12103-01: A2). Determination of fractional separation efficiency during the first 60 seconds. The curves shown are based on average values. Individual values may deviate slightly. Fractional separation efficiency changes with changed test conditions.

The high separation performance ensures that also smaller particles are separated by the nanofiber layer of the filter media. In order to determine the separation efficiency for a certain particle size, particles with a defined size are counted in the air flow upstream and downstream of the filter media. The results are shown using fractional separation efficiency curves. The nanofiber layer applied to the carrier verifiably reduces the passage of fine particles and therefore offers greater protection for the engine and its sensitive components.

R&D tools

nanofiber-media-pore-size-distribution.jpg Control of the pore size distribution of the nanofiber media by means of analysis software for targeted separation performance.

MANN+HUMMEL has the expert knowledge to develop high performance filter media which are configured to meet increasing customer requirements. MANN+HUMMEL uses simulations, laboratory tests and special analysis software to improve nanofiber coatings for customized applications and combines this technology with other media and materials.
In the development process MANN+HUMMEL uses analysis software (with a patent pending) which is able to automatically determine the fiber diameter distribution and pore size distribution from scanning electron microscope images of nanofibers. This distribution substantially determines the separation efficiency and flow resistance of the media.