4. Conclusions

As depth of penetration increases, fabric density and air permeability increase, breaking elongation decreases. Punch density does not have any influence on fabric density and air permeability, whereas breaking elongation decreases as punch density increases. Breaking force and breaking elongation decreases after initial increase as depth of penetration or punch density increases. Fabric density increases, air permeability and breaking elongation decreases on calendaring. Multilayered needled fabric shows higher fabric density, lower air permeability and low breaking elongation as compared to needled nonwoven fabric filters.

5. Acknowledgment

This research was funded in part through a grant by MINISTRY OF HUMAN RESOURCE DEVELOPMENT, GOVERNMENT OF INDIA. The author wishes his sincere thanks for the same.

6. References

1)    Balasubramanian, N., Rakshit, A.K. & Patil, V.K. (1994), Some critical manufacturing parameters affecting the properties of nonwoven dust filters, Indian Journal of Fibre & Textile Research 18 (1994) 209-215.

2)    Midha, V.K. & Kothari, V.K. (2003), Gas filtration using textile Filters, The Indian Textile Journal 113, 9-17.

3)    Naik, A. (1983), Textile filter media-II, The Indian Textile Journal 93, 73-77.

About the Author:

The author is associated with the Department of Textile Technology, National Institute of Technology, Jalandhar, India.

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