Thesis Details

Thesis Title: An investigation on the effect of varying critical comber settings and components on the quality of combed sliver and ring spun yarn
Thesis Author: Greg High
Abstract: Cotton combing is a mysterious process with limited data available on appropriate methods for improvement. Currently half lap and top comb modifications appear to offer the greatest potential for improvement. This work will serve to evaluate various hardware components available on the market in conjunction with settings in an attempt to discover if there are more efficient set-ups which can produce yarns of equal or better quality while minimizing noil extraction. This study was conducted using three top combs and half laps, each with different needle densities. Two cushion plate and top comb depth of penetration settings were also used. These hardware and settings were used to vary the intensity of the combing-out of the lap and fiber fringe. By doing this, it was discovered that the individual combing elements and their interactions significantly affected noil, sliver, and yarn properties. The half lap with the lowest needle density was inferior to the denser needled ones, and the medium density top comb (60 needles/in) was inferior to the lower and higher top comb needle densities. A deep top comb penetration and wide cushion plate setting were found to deliver sliver and yarn better in qUality. This work should allow combers to get better results when combing cotton staple fibers. In the final analysis, it was determined that a high quality yarn could be spun using a comber set-up which did not necessarily extract excessive noillevels, and that selection of comber elements is critical to efficient combing.