Home / Knowledge / News / Textiles / Blend of nanofibres & coarse fibres help filter fine dust particles
Blend of nanofibres & coarse fibres help filter fine dust particles
04
Oct '08
The removal of particles with fibre filters means that the particles must first come into contact with the filter medium and then adhere to the fibres due to the Van-der-Waals forces and the electrostatic forces which act between the fibres and the particles.

For small particles, these forces are so large that they cannot be easily removed from the fibres. This usually only occurs if washing liquids are used.

The diagram illustrates the removal of particles from fibres and shows the flow around the cross-section of a fibre. Particles of different sizes move towards the fibre with the flow (red streamlines).

Due to their inertia, large, heavy particles (1) cannot follow the streamlines around the fibre. They come into contact with the fibre in the angstrom region and are removed. Small particles (2) follow the streamlines, but due to their size they come into contact with the fibre and are therefore removed (barrier effect).

Very small particles (3) also follow the streamlines. However, this movement is dominated by an undirected random movement: particles less than a micrometre in size are so small, that the impulses of the moving air molecules are sufficient to deflect the particles from their linear path.

This effect is known as Brownian Motion or diffusion. There is a certain probability that the random path of the particles will bring them into contact with the surface of the fibre, and that they will be removed. Particles which are removed by the diffusion movement are distributed around the entire fibre.

Small and very small particles are almost exclusively removed by diffusion. For effective removal it is therefore necessary to deliberately use Brownian Motion.

The probability that a particle which is moving randomly will come into contact with a fibre depends on the available surface area of the fibre and the length of the diffusion path. The smaller the selected diameter of the fibre, the larger the specific surface area for the same volume.

In addition, the distances between the fibres is reduced. Both of these effects mean that with a reduction in the fibre diameter of the filter media, the removal performance for fine dust increases considerably.

Filter media which contain nano- or microfibres are therefore characterised by a very high removal performance in the fine dust range.

As well as the degree of removal, the mechanical strength of the medium and the dust storage capacity are also essential quality criteria.

Therefore nanofibres are combined with coarser fibres. Nanofibres can be integrated into the substrate medium or applied to the supporting layer like a spider's web. In both cases, they increase the degree of removal.

MANN+HUMMEL, development partner and series supplier to the international automobile industry uses nanofibres media for interior and air filters.

These high performance media supplement the range of media and are used for series production and for MANN-FILTER branded products.

MANN+HUMMEL Group

Must ReadView All

Pakistan's Finance Minister Mohammad Ishaq Dar presenting Budget 2017-18 in National Assembly in Islamabad on May 26. Courtesy: PID, Pakistan

Textiles | On 27th May 2017

Pakistan Budget 2017-18 proposes 4 new measures

To support the textile sector in Pakistan, finance minister Mohammad...

Courtesy: IRRC Institute

Apparel/Garments | On 27th May 2017

Up to 7.5 mn retail jobs in US at risk due to automation

About 6-7.5 million retail jobs in the US are likely to be automated...

Textiles | On 27th May 2017

Indian textiles ministry promotes wool sector

The ministry of textiles has taken multiple steps to promote the wool ...

Interviews View All

Md Hanifur Rahman
Aman Group

The level of understanding the job role and organisational requirements...

Awen Delaval
Samatoa

'Natural fibres are appreciated for traditional authenticity'

Sachin Sharma
Gem Enviro Management Pvt Ltd

There are no significant differences between virgin yarn and PET recycled...

Kai Poehler
Voith Paper GmbH & Co. KG

The glass mat industry is growing by five to eight per cent annually. Kai...

Urs Stalder
Sanitized AG

Urs Stalder, CEO, Sanitized AG, talks about the increasing use of hygiene...

Marcel Alberts
Eurofibers

Coating at a fibre level is a practice not usually seen in the...

Wendell Rodricks
Wendell Rodricks

"We should not compare India and the West. There are things we do that...

Robert Brunner
Devereux

Golfwear and menswear brand Devereux is set for greener pastures. Robert...

Rupa Sood and Sharan Apparao
Nayaab

Nayaab, an exhibition meant to celebrate Indian weaves, is in its second...

Press Release

Press Release

Letter to Editor

Letter to Editor

RSS Feed

RSS Feed

Submit your press release on


editorial@fibre2fashion.com

Letter To Editor






(Max. 8000 char.)

Search Companies





SEARCH

news category


Related Categories:
May 2017

May 2017

Subscribe today and get the latest update on Textiles, Fashion, Apparel and so on.

SUBSCRIBE


Browse Our Archives

GO


E-News Insight
Subscribe Today and Get the
Latest News Update in Your Mail Box.
Advanced Search