The Measurement of Sliver Properties on the Drawframe

Grover, G. K.; Lord, Peter

doi:10.1080/00405009208631231

Cited by 9 publications

(5 citation statements)

References 3 publications

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“…In roller drafting, several researchers have reported fiber grouping behaviors [2,3,4,8]. The size and number of clusters depend on several factors such as fiber length, crimp, spin finish, etc.…”

Section: Discussionmentioning

confidence: 99%

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Drafting Dynamics of Fine Denier Polyester Fibers

Korkmaz

Behery

2004

Textile Research Journal

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It is important to understand the role of fiber properties in the drafting process. Finer denier fibers may have different drafting behaviors than average denier fibers, such as drafting force, required roller settings, draft distribution, and velocity change zone. The objective of this work is to study the interaction of specific fiber fineness values and the drawing machine. Three different fine denier polyester fibers (0.8, 1.0, and 1.2) are run on a three-over-three roller drafting machine set at six different drafts with three roller settings. A high-speed video camera system observes fiber movements and measures fiber speeds in the drafting zone. In this study, fiber speed and variations in fiber speed are significantly affected by fiber fineness and drafting conditions. Fineness changes drafting behavior by introducing fiber clusters and fiber contact points. The acceleration process depends on the interaction of static and dynamic friction forces at the fiber contact points. Therefore, fiber movement in the drafting zone is not a continuous process, that is, it consists of local acceleration and slowing down of segments of fibers.

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Section: Discussionmentioning

confidence: 99%

“…In recent years, different enzymes, i.e., cellulases, pectinases, lipases, and proteases, have been tested for biopreparation [ 1,2,10,11,14,15]. We have demonstrated recently [3] that xylanase enzymes can also be effective in removing natural impurities from cotton.…”

Section: Discussionmentioning

confidence: 99%

Drafting Dynamics of Fine Denier Polyester Fibers

Korkmaz

Behery

2004

Textile Research Journal

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“…up to the sliver stage. Many properties can be evaluated at the drawframe stage [248]. All this processing can be done on full-scale industrial plant but to do it on many small lots disrupts production and requires a larger sample size.…”

Section: Generalmentioning

confidence: 99%

Cotton Testing

Steadman¹

1997

Textile Progress

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“…Johnson [11] was the first who tried to describe the dynamics of the roll draft process by computer simulation, while adopting simple model elements for the roll drafting system. Lord and Govindaraj [12] and Grover and Lord [13] developed a dynamic measurement system in drafting to find process errors and to assess product quality.…”

mentioning

confidence: 99%

Occurrence of a Singular Point in a Bundle Flow System and the Sensitivity of the Bundle Thickness to Perturbations in a Steady State Draft Process

Huh

Kim

2008

Textile Research Journal

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Roll drafting is an important unit operation that transforms fiber bundles into attenuated ones, improving their properties with more efficient material usage. Fibers are thus thrown into a flow field having constraints at both ends incurring layer-to-layer flow shearing, which governs the individual fiber movement. The parameters of the flow characteristics are disturbed or changed during processing and the output of the roll drafting operation can have either more or less fluctuating properties. In this research, we perturbed the model parameters related to the roll drafting process to identify their effects on the process dynamics and consequently the quality of the processed product. Based on the random phase spectral method, stochastic signals having an exponentially decaying auto-correlation function were generated and applied to the mathematical model that described the dynamic behavior of the flowing bundle. Thus, the profiles of the linear density and velocity of the bundle flow field in steady state were simulated. In extreme perturbations the bundle can break, which was simulated and confirmed by experiments. This research showed that a singular point in the draft zone existed which implied a bundle breakage. The singular point in the draft zone could be attributed to the inadequate set-up of the process conditions, specifically, to two parameters in the model: one was related to the bundle properties and the other to the process conditions. Considering the bundle property related parameter as a stochastic process, the range of the parameter variation to ensure a continuous drafting operation was limited. The influence of the perturbations on the draft process also became more sensitive as the process speed and the draft ratio increased.

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The Measurement of Sliver Properties on the Drawframe

Cited by 9 publications

References 3 publications

Drafting Dynamics of Fine Denier Polyester Fibers

Drafting Dynamics of Fine Denier Polyester Fibers

Cotton Testing

Occurrence of a Singular Point in a Bundle Flow System and the Sensitivity of the Bundle Thickness to Perturbations in a Steady State Draft Process

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