The Effect of Settings and Speeds throughout the Worsted Card on Combing Performance

Haigh, Michael; Harrowfield, B. V.

doi:10.1080/00405009008658706

Cited by 3 publications

(4 citation statements)

References 5 publications

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“…Previous studies [7] showed that the optimum draft for the workers on the swift of the Thibeau CF card was ~2.0 %, which was adopted as a control draft. Two additional drafts were selected spanning commonly used values, 4.3 % and 0.4 %.…”

Section: Card Operation and Trial Designmentioning

confidence: 99%

“…A separate electric motor was used to drive the workers so that the direction of rotation could be reversed by electrical switching. The effect of reversing the rotation of the workers of the forepart was not investigated here mainly because studies have shown that most of the bene-fits from changes to the card occur as a result of changes on the swift [7].…”

Section: Card Operation and Trial Designmentioning

confidence: 99%

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Reversed Direction of Worker Rotation in Worsted Carding

Atkinson

2010

Textile Research Journal

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The effect of reversing the direction of rotation of workers on the swift of a worsted card was studied in a trial that included processing to top. Experimental conditions studied were worker draft (three levels), doffer draft (two levels), and wool type (two levels). Production rate was held constant throughout at values typical for worsted carding, ~1 gsm production fiber density on the swift and standard topmaking procedures were used after carding. The results showed that the only effect of reversing the direction of rotation identified was increased fiber breakage and noil at the lowest opening roller draft (0.4 %). A tracer fiber study failed to identify any effect of the direction of worker rotation on the fiber structure of the card web. The reason for the increased fiber breakage with reversed direction of rotation at very low draft was thought to be the increased loading in the nip due to the trailing ends of the fibers. The implications of reversing worker rotation for roller carding in general are briefly considered.

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Section: Card Operation and Trial Designmentioning

confidence: 99%

Section: Card Operation and Trial Designmentioning

confidence: 99%

Reversed Direction of Worker Rotation in Worsted Carding

Atkinson

2010

Textile Research Journal

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“…The secondary calibration requires feeding fiber through the comb for a fixed time and weighing the corresponding output and noil, giving m out and m N , respectively. While the comb is running, the software converts the output voltages from the proximity sensors on the input and output roller pairs to roller separations, and integrates the signals to give, respectively: (5) where n is the number of roller rotations obtained from the counters, h is the roller separation obtained from the primary calibration, and C is the circumference of the input and output drive rollers.…”

Section: Calibrationmentioning

confidence: 99%

“…In worsted combing, noil levels are typically in the range 4-8% for good 'combing' wools, but may be as high as ~15 % for short or tender wool. Noil is an important economic consideration in combing because it represents lost production and for this reason has been studied over a long time [1][2][3][4][5][6]. A small reduction in noil, given the throughput of modern plants, represents a significant increase in the return to the comber.…”

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confidence: 99%

A Method for the Continuous Measurement of Combing Noil and Its Application in Wool Topmaking

Atkinson

Stannard

Bagshaw

2009

Textile Research Journal

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Noil is waste fiber generated during combing of staple fiber, the level of which is generally a concern due to the associated economic loss. Strategies to reduce noil have not developed because there has not been a reliable, comprehensive, and accurate method of measurement in a combing plant. We describe here a new method for the continuous, automatic monitoring of the total noil without any interference with operator procedures or production. The noil monitoring system was installed on eight combs in a commercial topmaking plant and tested for 24 hours a day for six months. The data obtained from this trial revealed important performance details of the combing operation, such as noil level and noil production, linear density of the prepared and combed slivers, the number of slivers in the feed, production rate of each comb, the feed rate to each comb, machine operating speed, run-time and down-time for each comb, and comb process efficiencies. The data confirmed that this system could be used as a tool for improving management and control of combing.

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Carding Theory

2003

Fundamentals of Spun Yarn Technology

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The Effect of Settings and Speeds throughout the Worsted Card on Combing Performance

Cited by 3 publications

References 5 publications

Reversed Direction of Worker Rotation in Worsted Carding

Reversed Direction of Worker Rotation in Worsted Carding

A Method for the Continuous Measurement of Combing Noil and Its Application in Wool Topmaking

Carding Theory

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