Combed Sliver Post-Processing and Doubling
topic
Post-combing sliver processing doublings of 6 to 8 combed slivers in post-comber drawing frames compensates for the periodic mass variation introduced at comber piecing points at the fundamental detaching advance interval, with drawing drafts equalising sliver count and blending piecing irregularities across doubled sliver assemblies before ring frame roving preparation stages.
Role
Eliminates the periodic mass variation at the comber piecing interval from the combed sliver quality profile that would otherwise propagate through drawing and roving into a yarn periodic fault detectable in fabric as a repeating thick-thin pattern, with adequate post-comber doubling being prerequisite for achieving the yarn evenness potential of combed sliver preparation.