A study on fiber motion in the drafting zone and hook removal

Shen, Yuanying; Yu, Chongwen; Yang, Jianping

doi:10.1177/0040517519889557

Cited by 5 publications

(8 citation statements)

References 17 publications

(19 reference statements)

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“…where m rd , C rd -reduced mass and rigidity of the needle at lateral interaction with pitched cam; α -the angle of profile of working surface of cam; F r -resisting force to needle movement in race, which is created artificially in order to prevent its lowering in needle race; h -damping coefficient; δ -logarithmic decrement of oscillation (h and δ determined by attenuation of oscillations, corresponding to impact process); K c -coefficient, which takes into account additional deformations of the bend of rod and heel of the needle at the moment of impact. Useful resisting force, which corresponds to the force of friction of old loop during its takedown, was neglected, because the needle did not perceive the effect of raid-in thread during the impact [25]. Preliminary the transition from stress in the heel of the needle to stress in its hook under different load conditions was performed:…”

Section: Methodsmentioning

confidence: 99%

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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The questions of design maintenance of a given fatigue longevity of rods of complex form during the intensification of load modes without changing of geometric, inertial and rigidity parameters of roads are considered. The study is conducted on the example of needles of circular machines with a small diameter of cylinder (automatic half-hose machines). An approach, based on the system of calculation of loads, loadings and resources under the criterion of fatigue strength, is proposed. The key link for the transition from the results of dynamic analysis to the determination of reliability indices is the dependence of limited longevity of needles on the cycles of load to fatigue failure with the use of statistical data on operating time to fatigue failure of the needles in production conditions. Since the random values of loads of the needles do not obey the normal law of distribution, the general description of density of distribution of amplitude of loads is presented. The influence of increase in speed parameters and constructive measures, aimed to reduce the corresponding loads at a current size of critical section of the needles, on the fatigue longevity is analyzed.

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Section: Methodsmentioning

confidence: 99%

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Berezin

Rubanka

et al. 2021

Period. Polytech. Mech. Eng.

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“…Yang and coworkers 11 proposed an improved simulation of fiber random arrangement based on the model of Jiang by considering the fiber configuration present in the sliver. Latterly, Shen et al 12 explored the straightening effect of the drafting process on four types of hooks, and improved the straightening theory by analyzing the relationship between fiber length, fiber straightness, draft ratio, and the fiber acceleration point (FAP). Several other researchers [13][14][15][16] have investigated the distribution of fibers during the roller drafting zone based on computer simulation.…”

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confidence: 99%

A study on the dynamic motion of floating fibers in the double apron drafting process

Shen

Qian

Meng

2022

Textile Research Journal

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Double apron drafting is an important unit in yarn spinning; the motion of fibers during the double apron drafting zone directly determines the quality of the final yarn. In this research, we sought to study how the motion of the fibers and the irregularities introduced during the double apron drafting process were affected by the processing settings and fiber properties. The fiber acceleration point under different drafting conditions was investigated using the tracer fiber technique. The results showed that both the drafting parameters as well as the input sliver properties have a certain influence on the fluctuation of fiber acceleration points, but the difference is small. In addition, the irregularity caused by the fluctuation of the fiber acceleration point during the drafting process (CVFAP) was also calculated under the same drafting conditions based on the irregularity of the input sliver and that of the spun yarn. By comparing the relationship between the CVFAP and fiber acceleration point fluctuation, it was found that the trend of the change between the two is in fairly good agreement. This is consistent with theoretical research and practical experience, and it can prove the accuracy of the fiber acceleration point test results from another aspect as well. Studying the dynamic motion of floating fibers during the double apron drafting process sheds light on the correlation between spinning conditions and yarn quality, which can provide a reference for process optimization.

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“…At present, some research has focused on predicting the quality of sliver or yarn, such as limit unevenness, by simulating the spinning process. 21–23 In the spinning process, drafting is one of the most important processes for fiber rearrangement. Sun et al.…”

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confidence: 99%

“…21 and Shen et al. 22 simulated the drafting process of straight fiber and hook fiber in a simple roller drafting, and predicted the unevenness of the yarn after drafting. Quan et al.…”

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confidence: 99%

Simulation of sliver blending and evaluation of blending irregularity

Cao

Qian

et al. 2021

Textile Research Journal

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The quality of blended yarn depends on the uniformity of the blending of the multi-component fibers in the yarn, and sliver blending is a process necessary for mixing fibers. The movement of fibers directly affects the distribution and mixing of fibers in the sliver. In this paper, the sliver blending process was simulated, and a method for the evaluation of sliver blending irregularity was proposed. The effects of passages of drawing and blending ratio on the sliver mixing uniformity were studied and verified both by experiment and simulation. The results show that the blending irregularity decreases gradually and tends to be stable with the increase of the passages of blending drawing. The more similar the blending ratio of the two components with approximately equal linear densities, the easier it is for the component fibers to mix evenly in the sliver. The simulation results are in good agreement with the measured values and previous research results. In addition, the blending irregularity of fiber components in the blended sliver can be predicted by the simulation method.

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A study on fiber motion in the drafting zone and hook removal

Cited by 5 publications

References 17 publications

Estimation of Fatigue Longevity of Rod Elements of Complex Form

Estimation of Fatigue Longevity of Rod Elements of Complex Form

A study on the dynamic motion of floating fibers in the double apron drafting process

Simulation of sliver blending and evaluation of blending irregularity

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