14—the Effect of the Strength Properties of Wool Staples on Worsted Processing Part I: The Level of Staple Strength

Rottenbury, RA; Andrews, M. W.; Bell, P. J. M.; Bownass, R.

doi:10.1080/00405008608658408

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…This agrees with earlier work using commercial lots of wools which also found that staple length, staple strength, and fibre diameter were important in predicting various measures of mean fibre length after early processing (TEAM Final Report 1985;Ranford et al 1986). The relationship of staple strength with processed fibre length is supported by other studies (Ross et al 1960;Bratt et al 1964;Hunter 1980;Rottenbury et al 1986). The underlying factors which determine the length of a fibre after early processing seem, therefore, to be length, strength and, to a lesser extent, diameter (cross-sectional area).…”

Section: Discussionsupporting

confidence: 67%

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

Orwin¹,

Ranford²,

Geenty³

1988

New Zealand Journal of Agricultural Research

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The prediction of length-after-carding parameters (especially barbe) by several fleece characteristics was examined with wool from 58 non-pregnant Romney ewes. During the winter, the sheep were housed indoors in five groups which were fed at different levels of nutrition in an attempt to increase the variation in staple strength. However, only the group fed at the lowest level (submaintenance) showed any major effect. Considerable variation in staple strength occurred within the groups. About 61 % of the variation in barbe was explained by a regression equation based on staple length, the staple strength of midside wool, and the mean fibre diameter determined by the air-flow method. Bulk, greasy, and clean fleeceweight, and the position of break in the staple did not improve the prediction. A marginal improvement resulted when air-flow fibre diameter was replaced by minimum diameter determined from monthly midside clippings. No major variations were found in the prediction equation as a result of using different staple strength measurements or using wool from other body positions..

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Section: Discussionsupporting

confidence: 67%

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

Orwin¹,

Ranford²,

Geenty³

1988

New Zealand Journal of Agricultural Research

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…• 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].…”

Section: Introductionmentioning

confidence: 99%

“…Fine fleece wool and pieces were sourced from commercial display samples over a broad range of sources typically offered for auction and assembled as a consignment. Rottenbury et al [4] have used this approach in the past. It should be noted that the greasy wool was sourced from commercial grab samples to investigate the role of staple strength in processing while keeping the other raw wool characteristics as closely matched as possible.…”

Section: Introductionmentioning

confidence: 99%

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

Prins

Pierlot

2010

Textile Research Journal

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The impact of staple strength on later stage processing of fine fleece wools (19 µm) and the blending with pieces is investigated. The staple strength findings complement those of previous researchers who used wools of different fibre diameters or from single flocks. The results reported here show that, as previously, 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. Blending fleece wool and pieces was shown to increase combing noil and reduce fibre length in the top. The topmaking results conducted at CSIRO suggest that there may be an economic advantage in incorporating lower staple strength, and hence cheaper wools, in an all-fleeces consignment while still being able to meet the technical requirements for yarn and fabric production. Although statistically significant, the small tenacity and elongation differences for 1/64 Nm yarns produced from the high and low staple strength test batches appear to have had no significant impact on the fabric tensile properties. There were no inter-batch yarn evenness and fault level differences recorded, with top dyeing having a much greater influence on yarn quality than any differences associated with staple strength.Blending fleeces and pieces in a 60/40 ratio had a greater impact on processing from raw wool to fabric than the effect of staple strength over the range investigated. In comparison to an all-fleeces batch it would appear the economics of processing a fleeces-and-pieces batch may not be attractive, as the blend composition had an adverse effect on yarn fault levels, tenacity and elongation, which in turn may adversely affect weaving performance. However, the effect on fabric properties appears to be minor.

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“…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.…”

mentioning

confidence: 99%

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

Prins

Pierlot

2010

Textile Research Journal

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A processing trial was conducted at CSIRO comparing three batches of 17 µm, superfine fleece wool, collected from sale lot samples and matched for fiber properties but not staple strength. The three batches were compiled from auction display samples to have average staple strengths of 24, 32 and 43 N/ktex and were converted to top, yarn, and plain weave fabric. We demonstrate that, similar to previous research with mid-micrometer and fine wools sourced from commercial lots over a broad range of sources typically offered for auction and assembled as a consignment, staple strength has little influence on processing and product performance beyond top for superfine wool. We also compare our processing results to the predictive tools available to the industry (e.g. TEAM-3 and Yarnspec). The discounts applied to low staple strength raw wool should primarily be a reflection of commercial factors, for example supply and demand, rather than on objectively measured performance and technical attributes of the top and yarn. Economic benefits in topmaking may be possible through the selection and use of discounted, low staple strength wools with minimal impact on the technical attributes for yarn and fabric.

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14—the Effect of the Strength Properties of Wool Staples on Worsted Processing Part I: The Level of Staple Strength

Cited by 8 publications

References 6 publications

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

Relationship of staple strength and other fleece characteristics of Romney wool to fibre length after carding

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

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

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