Nanofiber
Nanofibers are fibers with a fiber diameter of less than 1000 nanometers (nm) (1 µm). In a modern fine dust filter, for example, this is ideally 200 nm, but can be up to 800 nm. According to the company Hills Inc. , the fiber diameter varies between 50 and 300 nm.
application
The application of nanofibers is currently focused on the air filter industry. A distinction is made between two materials that are used as standard in air filter fleeces, glass and synthetic fibers. The manufacturers of glass fibers for air filters already have many years of experience with integrated nanofibers. In contrast, the processing of integrated nanofibers in synthetic fiber fleeces is somewhat more recent.
The benefit of integrating these ultra-thin fibers into an air filter fleece is made clear by the slip-flow effect . They effectively separate fine and ultra-fine particles and at the same time have such low coefficients of friction that they are very interesting in terms of energy with regard to the pressure difference.
production method
Nanofibers are always processed in a composite fleece . For synthetic fiber webs, this means that they are already used during manufacture, e.g. B. by electrospinning , with other methods such as melt spinning and. a., are combined and thus enter into a composite with microfibers . In addition, support or protective fleece can be added to the micro-nano-fiber composite, so that a composite fleece is created. In the case of glass fiber fleeces, the jet blowing process for the production of air filter fleeces with nanoscale fibers is very common.
literature
- James Stephenson: N202 Things You Can Buy and Sell for Big Profits! . Entrepreneur Press, 2004, ISBN 1-932531-22-X .
- Robert H. Avery: NAFA guide to air filtration . Natl Air Filtration Assn, 1993, ISBN 1-884152-00-7 .
- H. -P. Hortig, L. Gail: Clean room technology . Springer Verlag, Berlin 2004, ISBN 3-540-20542-X .
- Derek B. Purchas, Ken Sutherland: Handbook of Filter Media . Elsevier Science & Technology, 2002, ISBN 1-85617-375-5 .
Web links
- Timothy Grafe, Kristine Graham: Polymeric Nanofibers and Nanofiber Webs: A New Class of Nonwovens. INTC 2002: International Nonwovens Technical Conference (Joint INDA - TAPPI Conference), Atlanta, Georgia 24. – 26. September 2002.
- Kristine Graham, Ming Ouyang, Tom Raether, Tim Grafe, Bruce McDonald, Paul Knauf: Polymeric Nanofibers in Air Filtration Applications. Fifteenth Annual Technical Conference & Expo of the American Filtration & Separations Society, Galveston, Texas 9-12. April 2002.
- Frequently Asked Questions.
- Production of Sub-micron Fibers in Non-Woven Fabrics.
- Progress in nanofiber production , ITV Denkendorf, lecture Hofer Vliesstofftage 2005
- NTC USA Research Report
- Book: Nanofibers and nanotechnology in textiles
- Edana Filtrex Conference 2006, Report on Nanovliz
- CCSE Nanotechnology in textile finishment
Individual evidence
- ↑ Gajanan Bhat (ed.); Structure and Properties of High-Performance Fibers. Elsevier 2017, ISBN 978-0-08-100550-7 , p. 267.