<span style="font-size:15.0pt;mso-bidi-font-size: 14.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:Mangal;mso-ansi-language:EN-GB;mso-fareast-language:EN-US; mso-bidi-language:HI" lang="EN-GB">Studies on the physical properties of Dref-III spun yarns by variation of machine parameters with Box and Behnken’s 3<span style="font-size:15.0pt;mso-bidi-font-size: 14.0pt;font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; color:black;mso-ansi-language:EN-GB;mso-fareast-language:EN-US;mso-bidi-language: HI" lang="EN-GB">×<span style="font-size:15.0pt;mso-bidi-font-size:14.0pt; font-family:"Times New Roman";mso-fareast-font-family:"Times New Roman"; mso-bidi-font-family:Mangal;color:black;mso-ansi-language:EN-GB;mso-fareast-language: EN-US;mso-bidi-language:HI" lang="EN-GB">3 model</span></span></span>

Abstract

Response surface equations have been derived for prediction of the effects of nip distance, nip pressure and drum speed on tenacity, breaking extension, initial modulus, specific work of rupture, unevenness and packing coefficient of Dref-III yarn. Contour curves have been constructed to study the interaction effect of different variables on different responses. Tenacity, breaking extension, initial modulus, evenness and packing coefficient of yarn drastically decrease with the increase in nip distance. Increase in nip pressure causes increase in tenacity and packing coefficient of yarn at very high rate. Increase in drum speed increases the initial modulus of yarn largely. Interaction effect between nip distance and drum speed has positive influence on tenacity, breaking extension, specific work of rupture and packing coefficient of yarn. Interaction of nip pressure and nip distance has positive influence on tenacity of Dref-III yarn.