International Science Index


10001106

Optimum Design of Attenuator of Spun-Bond Production System

Abstract:

Nanofibers are effective materials which have frequently been investigated to produce high quality air filters. As an environmental approach our aim is to achieve nanofibers by melting. In spun-bond systems extruder, spin-pump, nozzle package and attenuator are used. Molten polymer which flows from extruder is made steady by spin-pump. Regular melt passes through nozzle holes and forms fibers under high pressure. The fibers pulled from nozzle are shrunk to micron size by an attenuator; after solidification, they are collected on a conveyor. In this research different designs of attenuator system have been studied; and also CFD analysis has been done on these different designs. Afterwards, one of these designs tested and finally some optimizations have been done to reduce pressure loss and increase air velocity.

References:
[1] W. Michaeli, “Extrusion Dies for Platic and Rubber: Design and Engineering Computations” Münich: Hanser, 2003.
[2] O. Yilmaz, G. Goren, M. Balaban, and K. Kirkkopru, “The Systematical Design of Plastic Spiral Extrusion Dies and Validation of Design Methodology by CFD Analyses” Sigma, vol. 31, pp. 335–349, 2013.
[3] US Patent 5292239 Apparatus for producing nonwoven fabric.
[4] US Patent 3692618 Continuous Filament Nonwoven Web.
[5] US Patent 4812112 Apparatus for making a spun fleece from endless synthetic-resin filament
[6] US Patent 6183684 Apparatus and method for producing non-woven web with high filament velocity
[7] C. J. Luo, S. D. Stoyanov, E. Stride, E. Pelan and M. Edirisinghe, “Electrospining versus fibre production methods: from specifics to technological convergence” Chem. Soc, vol. 12, pp. 4708-4735, 2012.
[8] E. E. Koslow, “Nanofiber filter media”, 6,872,321, 2005. CONCLUSION There was a large amount of pressure losses at interior part of attenuator unit which have been reduced significantly by changing some design parameters. Also by using the same properties of inlet a 3 times larger amount of velocity has been obtained at jet section which will help to protract nanofibers more than before. Also by using smooth narrowing method at interior part there will be less vibration which will help to obtain more uniform spun-bonds. ACKNOWLEDGMENTS We gratefully acknowledge the financial support of The Scientific and Technological Research Council of Turkey (TUBITAK), through grant number: 112M311. REFERENCES
[1] W. Michaeli, “Extrusion Dies for Platic and Rubber: Design and Engineering Computations” Münich: Hanser, 2003.
[2] O. Yilmaz, G. Goren, M. Balaban, and K. Kirkkopru, “The Systematical Design of Plastic Spiral Extrusion Dies and Validation of Design Methodology by CFD Analyses” Sigma, vol. 31, pp. 335–349, 2013.
[3] US Patent 5292239 Apparatus for producing nonwoven fabric.
[4] US Patent 3692618 Continuous Filament Nonwoven Web.
[5] US Patent 4812112 Apparatus for making a spun fleece from endless synthetic-resin filament
[6] US Patent 6183684 Apparatus and method for producing non-woven web with high filament velocity
[7] C. J. Luo, S. D. Stoyanov, E. Stride, E. Pelan and M. Edirisinghe, “Electrospining versus fibre production methods: from specifics to technological convergence” Chem. Soc, vol. 12, pp. 4708-4735, 2012.
[8] E. E. Koslow, “Nanofiber filter media”, 6,872,321, 2005.
[9] A. Kılıç, “Eriyikten Elektroüretim Yöntemiyle Nanolif Üretimi”, Fen Bilimler Enstitüsü, ĐTÜ, 2008.
[10] S. Ramakrishna, K. Fujihara, W. E. Teo, Z. W. Ma, T. C. Lim, “An Introduction to Electrospinning and Nanofibers” World Scientific Publishers, Singapore, 2005.