The Effect of Staple Strength and Position of Weakness of Greasy Wool on Worsted Spinning

Abstract

An Investigation is reported In which tops manufactured from batches of greasy wool varying widely In staple strength and the location of the zone of weakness were converted to yam on the worsted system.The strength properties of the greasy wools were not related to the fibre breakage that occurred In producing yam, nor did they significantly effect spinning breaks or yam properties when spinning speed was similar to that used in coMnerclal practIce.At higher speed, however^ variatIons In spinning efficiency and yam properties were nore closely related to the differences In Hauteur In the tops and therefore to the strength properties of the greasy wool.

Effects of Staple Strength and Raw Wool Blend Make-Up on Processing and Properties from Top to Fabric

“…As can be seen from the equation coefficients, the developers of TEAM wanted simple linear formulae for the relationships between the predicted parameters and the various greasy wool fibre properties: Fibre breakage in processing is expected to be dependent on individual fibre strength, and a marked correlation has been observed between staple strength and processing performance of greasy wool through to top (e.g. Rottenbury and Smith [3]; Rottenbury et al [4]; Plate et al [5]). It is not surprising then that staple strength and position of break (in addition to other raw wool characteristics) have an influence on the price paid for raw wool at auction.…”

“…• The direct effect of staple strength is limited to the production of tops, where staple strength influences fibre length in the top and the generation of combing waste [4,5,[10][11][12][13]]. • Staple strength is found to have almost no relationship to the average strength of bundles of fibres (as measured on a Sirolan Tensor at a 3.2 mm gauge length) in the resulting tops or with subsequent yarn strength and spinning performance, apart from its effect via the length of the top [12].…”

Effect of Staple Strength on Spinning Performance and Yarn Quality of Superfine Wools

“…Breakage in processing is expected to be dependent on individual fiber strength and a marked correlation has been observed between staple strength and processing performance of greasy wool through to top (e.g. Rottenbury and Smith [3]; Rottenbury et al [4]; Plate et al [5]). It is not surprising then that staple strength and position of break (in addition to other raw wool characteristics) have an influence on the price paid for raw wool at auction.…”

“…Using four 22 µm wool lots, Plate et al [5] examined the effect of staple strength over the range 21-53 N/ktex on worsted spinning performance and yarn properties. The results from their studies were consistent with the previous study by [4].…”