21—the Effect of Cylinder Loadings on Fibre Breakage in Worsted Carding

Eley, J. R.; Harrowfield, B. V.

doi:10.1080/00405008608658420

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…The Thibeau card was fitted with a Haigh-Chadwick Microweigh (not shown) that enabled the production fiber density (PFD) on the swift to be accurately set at the level of 1.0 gsm. The PFD, which is given by the ratio P/wv s , where P is the card production, w is the effective width of the card, and v s is the swift speed, determines the degree of controllable fiber breakage in worsted carding [6]. The PFD used in these experiments gave a total production rate for the card of ~46 kg/h for which the specific production rate was 27 kg h -1 m -1 , typical of current worsted carding operation.…”

Section: Cardmentioning

confidence: 99%

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: Cardmentioning

confidence: 99%

Reversed Direction of Worker Rotation in Worsted Carding

Atkinson

2010

Textile Research Journal

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“…Their work led to the conclusion that transfer efficiency at a steady state cannot be reliably measured by early off-line techniques. Eley and Harrowfield [ 5 ] then used the device to measure fiber loading on a full-scale roller-top card. They related the fiber breakage rate to fiber loading on the cylinder and found that it increased with fiber loading on the cylinder.…”

Section: Recent On-line Photometric Techniquesmentioning

confidence: 99%

Carding Dynamics Part II: Development of a Device for On-Line Measurement of Two-Dimensional Fiber Loading on Card Elements

Seyam

Jian

El-Shiekh

1999

Textile Research Journal

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The first part of this series shows that empirical and theoretical relationships developed to relate cardability to fiber movement and distribution have no practical value without a technique to measure fiber loading on card elements. This paper closely examines and compares off-and on-line techniques and devices implemented by previous researchers to measure fiber loads on card elements. Additionally, this part presents research efforts to develop a new optimum device with flexible features to measure two-dimensional fiber loading on card elements.From the empirical and theoretical investigations reviewed in Part I [ 13 ] of this study on fiber movement and transfer, we realized immediately the need to measure fiber loading and the collecting power of carding elements to determine carding performance. Realizing the importance of fiber loading on the cards, Zeidman and Batra' proposed a general concept for assessing fiber loading on the cards. For a flat-top card, the feed stream or fiber loading on the doffer, the load on the flats, the fiber load on any one of the cylinder regions, and the waste ratios at different points must be known to determine the fiber density in all regions of the card; for a roller-top card, the feed stream or fiber loading on the doffer, the loads on all workers, the fiber load on one of the cylinder regions, and the waste ratios at different points must be known to determine fiber density in all regions of the card. Attempts to find an effective way to measure fiber loads on any carding elements go back to the early 1940s [ 1-5, '7-I 2, 14, 15].2 These attempts mainly depended on tedious offline manual measurement procedures [ 10, 12 J . It soon became apparent that stopping, collecting, and weighing to determine the fiber load was restricting research progress because of its slowness and discontinuity.During late 60s, light reflection methods simplified measurements on the cylinder and the doffer. Measurement Techniques OFF-LINE TECHNIQUESThe earliest attempt to measure fiber load on a roller-top card was made by Martindale [ 12 ] , who conducted an experiment to determine the collecting power of the workers. He assumed the amount of fibers on the cylinder was equal to the feed rate. He found the amount of fibers on the worker by stopping the card, removing the worker chain and stripper belt, turning the worker by hand, and stripping the fibers from it by an oscillating motion of the stripper. The criticism of this method was that the fiber on the worker was picked up while the machine was slowing down to a standstill, which did not represent actual working conditions. Martindale conducted further tests to support his argument. The machine was run at full speed as one of the workers was lifted clear off the cylinder and held until the machine stopped. The fiber on it was then removed for weighing. A comparison of the methods showed that they gave slightly different results, but the difference was not sufficient to invalidate the earlier experimental results. Abhiraman and George [I] ...

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22—reduced Fibre Breakage in Continental Worsted Carding as a Result of Wool Lubrication

Eley

Harrowfield

1986

The Journal of The Textile Institute

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21—the Effect of Cylinder Loadings on Fibre Breakage in Worsted Carding

Cited by 6 publications

References 2 publications

Reversed Direction of Worker Rotation in Worsted Carding

Reversed Direction of Worker Rotation in Worsted Carding

Carding Dynamics Part II: Development of a Device for On-Line Measurement of Two-Dimensional Fiber Loading on Card Elements

22—reduced Fibre Breakage in Continental Worsted Carding as a Result of Wool Lubrication

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