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Textile Research Journal, Vol. 78, No. 7, 614-624 (2008)
DOI: 10.1177/0040517507081837

Development of Needle-punched Nonwoven Fabrics from Flax Fibers for Air Filtration Applications

Rajesh D. Anandjiwala

Fibres and Textiles Competence Area, CSIR Materials Science and Manufacturing, P.O. Box 1124, Port Elizabeth 6000, South Africa, Department of Textile Science, Faculty of Science, P.O. Box 77000, Nelson Mandela Metropolitan University, Port Elizabeth 6031, South Africa, ranandi{at}csir.co.za

Lydia Boguslavsky

Fibres and Textiles Competence Area, CSIR Materials Science and Manufacturing, P.O. Box 1124, Port Elizabeth 6000, South Africa

This paper reports an exploratory study on the production and measurement of the air permeability, mechanical properties, pore size distribution and filtration efficiency of different nonwoven fabrics produced by systematically changing the machine variables to influence the physical parameters of the fabrics. Only flax fiber waste was utilized for this trial, so that the possibility of value addition to a cheap source of raw material could be explored. The changes in air permeability were interpreted in terms of fabric density profile and pore size distribution. The tensile strength, fiber orientation distribution and bond strength between the layers of multi-layered fabrics were investigated. The filtration parameters, such as filtration efficiency, dust holding capacity and pressure drop, were evaluated. Furthermore, the effect of calendering on pore size and filtration properties was evaluated to explore the possibility of fine-tuning the performance of filters. The results in this study showed an overall improvement in all filtration characteristics due to the calendering operation.

Key Words: air filtration • air permeability • needle-punched nonwoven • flax fiber • pore size • calendering • de-lamination strength • tensile strength


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