Performance characteristics of filter fabrics in cement dust control: Part IV-Study of nonwoven filter fabrics using factorial design technique

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:calibri;mso-bidi-theme-font:minor-latin;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The central compound rotatable design of Box and Hunter for three variables has been used to study the individual and interactive effects of fabric weight, needling density and depth of needle penetration on the filtration properties of nonwoven needle-punched polyester filter fabrics. It is observed that with the increase in fabric weight at all levels of needling density and needle penetration, the air permeability decreases and the filtration efficiency and pressure drop increase. With the increase in either needling density or needle penetration, the air permeability first decreases up to a certain limit and thereafter increases at all levels of fabric weight. Filtration efficiency and pressure drop both initially increase and thereafter decrease with the increase in either needling density or needle penetration at all levels of fabric weight. The predicted equations for various responses agree well with the experimental data, as evident from the high coefficient of multiple correlations.</span>