Application of rotor wrapping twister for making ply yarn from nonwoven selvedges

Abstract

A novel rotor wrapping twister has been used for preparing ply yarn consisting of polypropylene nonwoven selvedges, copper wires and polyester filaments. It is observed that the ply yarn produced with this rotor twister possesses superior

<span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">electrical and mechanical properties due to the natural characteristics of the filaments. The ply yarn has been produced on the rotor wrapping twister under different conditions of twister count and rotor speed and then woven on a rapier loom. By varying manufacturing parameters, the helix angle and tightness of the twist-wrapped yarn can also be changed to enhance its mechanical properties and electromagnetic shielding effectiveness. The optimal conditions for producing the ply yarn wrapped with metallic filaments are 8000 rpm rotor speed and 2.5 turns/cm warping count, and that for wrapped with polyester filaments are 6000 rpm and 1.0 turn/cm.</span>