19—AN APPLICATION OF MINI-COMPUTERS TO THE OPTIMIZATION OF THE OPEN-END-SPINNING PROCESS PART XI: THE OPTIMIZATION OF THE OPENING-ROLLER SPEED AND TWIST FOR PROCESSING CONDITIONS REMOTE FROM THE OPTIMUM DURING THE ROTOR-SPINNING OF COTTON YARNS

1980 ◽  
Vol 71 (4) ◽  
pp. 195-200 ◽  
Author(s):  
A. Barella ◽  
J. P. Vigo
Keyword(s):  
Processing Conditions ◽  
Roller Speed ◽  
Rotor Spinning ◽  
Cotton Yarns ◽  
Spinning Process

scholarly journals Use of Taguchi Method and Grey Relational Analysis to Optimize Multiple Yarn Characteristics in Open-End Rotor Spinning

2017 ◽  
Vol 17 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Tanveer Hussain ◽  
Farooq Ahmed Arain ◽  
Zulfiqar Ali Malik
Keyword(s):  
Taguchi Method ◽  
Grey Relational Analysis ◽  
Rotor Speed ◽  
Rotor Spinning ◽  
Relational Analysis ◽  
Cotton Yarns ◽  
Spinning Process ◽  
Grey Relational Grade ◽  
Twist Level ◽  
Grey Relational

Abstract Rotor speed and twist per metres (tpm) are two key parameters in open-end rotor spinning of cotton yarns. High spinning productivity can be obtained by keeping the rotor speed high and twist level as low as possible. However, too high rotor speed may result in yarn imperfections and too low twist level may result in lower tenacity yarns. This study aimed at optimising the multiple yarn characteristics in open-end rotor spinning using the Taguchi method and the grey relational analysis. Cotton yarn samples of 30 tex were produced on rotor spinning machine with different twist levels (i.e. 500, 550, 600 and 700 tpm) at different rotor speeds (i.e. 70,000, 80,000, 90,000 and 100,000 rpm) according to the Taguchi design of experiment. Optimal spinning process parameters were determined using the grey relational grade as the performance index. It was concluded that for the cotton fibres and yarn count used in this study, optimum properties of the yarns could be obtained at 90,000 rpm rotor speed and 700 tpm.

scholarly journals Fabrication of piezoelectric poly(l-lactic acid)/BaTiO3 fibre by the melt-spinning process

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hyun Ju Oh ◽  
Do-Kun Kim ◽  
Young Chan Choi ◽  
Seung-Ju Lim ◽  
Jae Bum Jeong ◽  
...  
Keyword(s):  
Phase Transition ◽  
Lactic Acid ◽  
Crystalline Phase ◽  
Melt Spinning ◽  
Piezoelectric Properties ◽  
Polymeric Materials ◽  
Processing Conditions ◽  
Post Processing ◽  
Scanning Calorimetry ◽  
Spinning Process

Abstract Poly(l-lactic acid) (PLLA) based piezoelectric polymers are gradually becoming the substitute for the conventional piezoelectric ceramic and polymeric materials due to their low cost and biodegradable, non-toxic, piezoelectric and non-pyroelectric nature. To improve the piezoelectric properties of melt-spun poly(l-lactic acid) (PLLA)/BaTiO3, we optimized the post-processing conditions to increase the proportion of the β crystalline phase. The α → β phase transition behaviour was determined by two-dimensional wide-angle x-ray diffraction and differential scanning calorimetry. The piezoelectric properties of PLLA/BaTiO3 fibres were characterised in their yarn and textile form through a tapping method. From these results, we confirmed that the crystalline phase transition of PLLA/BaTiO3 fibres was significantly enhanced under the optimised post-processing conditions at a draw ratio of 3 and temperature of 120 °C during the melt-spinning process. The results indicated that PLLA/BaTiO3 fibres could be a one of the material for organic-based piezoelectric sensors for application in textile-based wearable piezoelectric devices.

Numerical Analysis and Comparison of Airflow in Rotors with U and V Groove during Rotor Spinning Process

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100
Author(s):  
Rui-Hua Yang ◽  
Chao Liu ◽  
Yuan Xue ◽  
Hongbo Wang ◽  
Weidong Gao
Keyword(s):  
Numerical Analysis ◽  
Process Parameters ◽  
Static Pressure ◽  
Optimum Process ◽  
Production Rates ◽  
Rotor Spinning ◽  
Yarn Quality ◽  
Spinning Process ◽  
High Production

Rotor spinning is known for high production rates and uniformity of the resulting yarn. However, determining machine components which will produce the optimum process parameters such as airflow speed to result in the best combinations of yarn quality and uniformity can be a difficult task. The aim of this study is to simulate and analyze the airflow characteristics in rotors with U and V grooves during the rotor spinning process. The results obtained showed that airflow speed resulting from a rotor with the V groove is higher than that of U type. As a result, the static pressure resulting from the use of the V type groove is lower than that of U groove.

scholarly journals Friele Model of Rotor Spun Multi-Primary-Colour-Blended Yarn

2019 ◽  
Vol 27 (5(137)) ◽  
pp. 50-59
Author(s):  
Ruihua Yang ◽  
Yaya Xu ◽  
Ruiye Han
Keyword(s):  
Industrial Production ◽  
Model Parameters ◽  
Mixing Effect ◽  
Model Parameter ◽  
Rotor Spinning ◽  
Blended Yarn ◽  
Two Component ◽  
Spinning Process ◽  
Production Flexibility ◽  
High Production

Multi-channel rotor spinning equipment can produce multi-colour mixed yarn by changing the feed speeds of three primary coloured slivers separately. The method realises the mixing of colour fibres during the spinning process, and has the characteristics of high production flexibility, simplicity and quickness. The colour mixing effect and colour blending ratio prediction are important conditions for industrial production. In this paper, two-component and three-component samples were spun with rovings of red, yellow and blue with different blending ratios. A colour model of the rotor spun multi-primary-colour-blended yarn was established based on Friele theory by determining the σ value, which is the model parameter determined by experiments. Two methods were employed to calculate the σ value to improve the accuracy of the model:1. under the condition of all wavelengths and 2. at various wavelengths. The results showed that the model parameters calculated at various wavelengths could better predict the colour of multi-channel rotor spun colour-blended yarn.

The Effects of Fiber Properties and Preparation on Trash Removal and Properties of Open-End Cotton Yarns

1977 ◽  
Vol 99 (1) ◽  
pp. 71-76 ◽  
Author(s):  
E. A. Vaughn ◽  
J. A. Rhodes
Keyword(s):  
Physical Properties ◽  
Static Pressure ◽  
Short Length ◽  
Rotor Speed ◽  
Roller Speed ◽  
Fiber Properties ◽  
Medium Length ◽  
Gap Opening ◽  
Cotton Yarns ◽  
Physical Tests

Cotton yarns of 36.9 Tex were spun at optimum twist levels on a Suessen Open-End Spin-tester at opening roller speeds of 5500 rpm, 7000 rpm, and 8500 rpm, and with waste-gap openings of 2.0 mm, 4.0 mm, and 5.5 mm from short and medium length cottons prepared with high and low gin cleaning. The spinning was performed at a constant rotor speed of 45,000 rpm and a static pressure in the spinning chamber equivalent to 7.9 × 10−5 Pa. Statistical analyses were performed on the data collected from physical tests performed on the yarn and on the amounts of trash extracted into the collection box and deposited in the rotor. These data are discussed along with a study of the nature of trash extracted into the collection box and deposited in the rotor. The results indicate that cotton fiber length was the most significant factor affecting yarn physical properties; yarns spun from short-length fibers were found to have better physical properties, less trash extracted into the collection box and deposited in the rotor, and fewer breakages than yarns spun from medium-length cottons. The degree of gin cleaning significantly affected only neps. More trash was extracted into the collection box and deposited in the rotor from cottons with a higher nonlint content after gin cleaning. Opening roller speed significantly affected single-end strength and thin places. As the opening roller speed increased, single-end strength increased, thin places decreased, the amount of trash extracted into the collection box decreased, and the amount of trash deposited into the rotor increased. The degree of waste-gap opening significantly affected single-end strength. At lower waste-gap openings, more trash was extracted into the collection box, and no significant effect on the amount of trash deposited in the rotor was found. The nature of trash extracted into the collection box was observed to be different from the trash deposited in the rotor.

scholarly journals Strain characteristics of cotton yarns depending on the strain rate and methods of their manufacture

2021 ◽  
Vol 304 ◽  
pp. 03027
Author(s):  
Bakhodir Baymuratov ◽  
Shamsidin Tulanov ◽  
Karim Sultanov ◽  
Sabida Ismailova
Keyword(s):  
Strain Rate ◽  
Strain Curve ◽  
Cotton Yarn ◽  
Strain Rates ◽  
Rotor Spinning ◽  
Cotton Yarns ◽  
Moduli Of Elasticity

One of the main reasons for the nonlinearity of the tension diagrams of cotton yarns is the variability of their moduli of elasticity and plasticity under strain. The changes in strain moduli obtained from the tensile diagrams confirm this. The strain curve has ten parameters, the values of which depend on the method of yarn manufacture and the strain rate. Based on the results of processing the tension diagrams of cotton yarn, obtained by carded and combed systems by ring and rotor spinning (CD-carded ring-spun, OE-carded rotor-spun, CM-combed ring-spun), at strain rates from 0,0033 s-1 to 0,033 s-1, the values of these ten parameters were determined and analyzed. Their quantitative and qualitative dependence on the method of their manufacture and strain rate are shown.

scholarly journals Airflow characteristics of different groove type during rotor spinning process

2017 ◽  
Vol 68 (3) ◽  
pp. 165-169
Author(s):  
RUI-HUA YANG ◽  
◽  
XUE YUAN ◽  
GAO WEI-DONG ◽  
◽  
...  
Keyword(s):  
Rotor Spinning ◽  
Spinning Process

scholarly journals Research on the flow characteristics of opening unit in the rotor spinning unit

2017 ◽  
Vol 25 (0) ◽  
pp. 18-24
Author(s):  
Yuzhen Jin ◽  
Shihe Zhu ◽  
Jingyu Cui ◽  
Jun Li ◽  
Zuchao Zhu
Keyword(s):  
Negative Pressure ◽  
Flow Characteristics ◽  
Axial Direction ◽  
Effective Area ◽  
Discrete Phase Model ◽  
Roller Speed ◽  
Rotor Spinning ◽  
Removal Process ◽  
Discrete Phase ◽  
Different Diameters

The opening unit is an important device in a rotor spinning unit to comb fibres and remove trash. In this paper, numerical simulation is carried out to study the flow structure in the rotor spinning channel and the trash removal process in the trash removal unit. Firstly the effect of the opening unit on the airflow field in the rotor channel is investigated by singlephase simulation. The result shows that the effective area for fibre conveyance enlarges as the absolute value of negative pressure at the outlet increases, while it decreases as the opening roller speed increases. However, the effect of the negative pressure and the opening roller speed on the length of the vortex in the axial direction is quite small. Secondly the trash separation process in the trash removal unit is simulated using the Discrete Phase Model (DPM). Suitable rotational speeds of particles of different diameters are acquired. These results could provide a valuable reference for parameter selection in the trash-removal process.

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