27—FACTORIAL STUDIES IN ROTOR-SPINNING PART III: ACRYLIC-FIBRE OPEN-END-SPUN YARNS

1984 ◽  
Vol 75 (4) ◽  
pp. 259-266 ◽  
Author(s):  
A. Barella ◽  
A. M. Manich ◽  
Patricia N. Marino ◽  
J. Garéfalo ◽  
L. Castro
Keyword(s):  
Rotor Spinning ◽  
Acrylic Fibre ◽  
Spun Yarns

Comparison of the airflow characteristics and yarn properties between conventional and dual-feed-opening rotor spinning units

2021 ◽  
pp. 004051752110417
Author(s):  
Qianqian Shi ◽  
Jiang Wang ◽  
Yuze Zhang ◽  
Qian Ding ◽  
Nicholus Tayari Akankwasa ◽  
...  
Keyword(s):  
Field Distribution ◽  
Air Pressure ◽  
Dynamics Simulation ◽  
Superior Performance ◽  
Rotor Spinning ◽  
Future Design ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Airflow Field ◽  
Fancy Yarns

In order to explore the differences between conventional and dual-feed-opening rotor spinning units (RSUs), this work compares the airflow characteristics of two RSU models utilizing a computational fluid dynamics simulation model with the accuracy verified by airflow behavior observation and air pressure measurement. The effect of two different opening roller speeds on the airflow field distribution of a dual-feed-opening model is also investigated. In addition, the yarn properties of six pure and blended yarns corresponding to the two RSU models are evaluated. The results reveal that the distributions of airflow velocity vector and air pressure in the two RSU models show a strong similarity under the same boundary conditions. However, the dual-feed-opening model possesses a centrosymmetric and more balanced airflow field distribution compared to the conventional model. In addition, the dual-feed-opening yarns show a superior performance in comparison to the conventional yarns. Furthermore, for the dual-feed-opening model, there are equivalent contributions of two separated opening and fiber transmission systems to the airflow field distribution and yarn formation. Compared to the configuration with the same two opening roller speeds, the dual-feed-opening model configured with two different opening roller speeds obtains an improved blended yarn performance with having few effects on the airflow characteristics. This strength of the dual-feed-opening RSU could facilitate the production of blended and fancy yarns employing the fibers with diverse properties. This study could provide some guidelines for the manufacture of rotor-spun yarns and the future design of RSUs.

20—THE INFLUENCE OF THE AIR PRESSURE AT THE ROTOR-CLEANING DEVICE OF ROTOR-SPINNING MACHINES ON THE PROPERTIES OF COTTON OPEN-END-SPUN YARNS

1985 ◽  
Vol 76 (5) ◽  
pp. 301-313 ◽  
Author(s):  
A. Barella ◽  
A. M. Manich ◽  
L. Castro ◽  
Patricia N. Marino ◽  
J. Carpintero
Keyword(s):  
Air Pressure ◽  
Rotor Spinning ◽  
Spun Yarns ◽  
Cleaning Device

Torque-Balanced Singles Knitting Yarns Spun by Unconventional Systems

1997 ◽  
Vol 67 (10) ◽  
pp. 739-746 ◽  
Author(s):  
X. M. Tao ◽  
W. K. Lo ◽  
Y. M. Lau
Keyword(s):  
Cotton Fibers ◽  
Burst Strength ◽  
Rotor Spinning ◽  
The Core ◽  
Modification Process ◽  
Knit Fabrics ◽  
Spun Yarns ◽  
And Performance ◽  
Single Jersey ◽  
Sheath Structure

This paper is the first part of a series reporting on the recent development of a yarn modification process to produce torque-balanced singles spun yarns. Taking advantage of the core-sheath structure of unconventionally spun yarns, we have developed a yarn modification process and applied it to singles yarns spun by rotor spinning, producing torque-free singles yarns from 100% cotton fibers. The spirality of the resultant single jersey knit fabrics is greatly reduced or, in some cases, completely eliminated. Properties and performance characteristics of both parent and modified yarns, as well as their resultant fabrics, are evaluated, including yarn tensile properties, surface properties, handle, air permeability, burst strength, and pilling resistance of the fabrics.

scholarly journals Blending effect of rotor spun yarn with different blending methods

2019 ◽  
Vol 70 (05) ◽  
pp. 403-407
Author(s):  
RUI HUA YANG ◽  
QIAN QIAN DENG ◽  
CHUN PING XIE ◽  
WEI DONG GAO
Keyword(s):  
Mechanical System ◽  
Cross Sections ◽  
New Method ◽  
Cross Sectional ◽  
Blend Ratio ◽  
Rotor Spinning ◽  
Spun Yarn ◽  
Blending Method ◽  
Spun Yarns ◽  
Rotor Spun Yarn

Color blended rotor spun yarn mixing with different methods were spun. Three blending methods were used, one passage of drawing, three passages of drawing and rovings during multi-channel spinning. Multi-channel spinning is modified on rotor spinning machine, which is implemented by a novel mechanical system specially designed to incorporate three separate feed rollers side by side and controlled by servo motors with PLC. Using this new method, blend ratio of yarn can be controlled and realized by asynchronous drafted rovings. 37 type of color blend yarn were produced with different blending ratios. And each yarn was intercepted with 5 cross sections and a total of 185 cross-sectional images were taken. Hamilton index of different colored fibers were calculated of the each type of yarns. And sum of absolute values of Hamilton index were got to demonstrated fibers blending effect in yarns cross sections. All the Hamilton index of the yarns prepared by the three above mentioned methods were all around 5, much below 20. The results showed that regardless of blending method used, the blending effects of rotor spun yarns were all very good.

scholarly journals Optimization Issues of a Hammer Mill Working Process Using Statistical Modelling

2021 ◽  
Vol 13 (2) ◽  
pp. 973
Author(s):  
Gigel Paraschiv ◽  
Georgiana Moiceanu ◽  
Gheorghe Voicu ◽  
Mihai Chitoiu ◽  
Petru Cardei ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Optimization Problem ◽  
Specific Energy Consumption ◽  
Statistical Modelling ◽  
Hammer Mill ◽  
Objective Functions ◽  
Working Process ◽  
Rotor Spinning ◽  
Milled Material ◽  
Different Types

Our paper presents the hammer mill working process optimization problem destined for milling energetic biomass (MiscanthusGiganteus and Salix Viminalis). For the study, functional and constructive parameters of the hammer mill were taken into consideration in order to reduce the specific energy consumption. The energy consumption dependency on the mill rotor spinning frequency and on the sieve orifices in use, as well as on the material feeding flow, in correlation with the vegetal biomass milling degree was the focus of the analysis. For obtaining this the hammer mill was successively equipped with 4 different types of hammers that grind the energetic biomass, which had a certain humidity content and an initial degree of reduction ratio of the material. In order to start the optimization process of hammer mill working process, 12 parameters were defined. The objective functions which minimize hammer mill energy consumption and maximize the milled material percentage with a certain specific granulation were established. The results obtained can serve as the basis for choosing the optimal working, constructive, and functional parameters of hammer mills in this field, and for a better design of future hammer mills.

A Computer Simulation Approach for Engineering Air-Jet Spun Yarns

1997 ◽  
Vol 67 (3) ◽  
pp. 223-230 ◽  
Author(s):  
Rangaswamy Rajamanickam ◽  
Steven M. Hansen ◽  
Sundaresan Jayaraman
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Fiber Length ◽  
Experimental Investigations ◽  
Simulation Approach ◽  
Air Jet ◽  
Fiber Fineness ◽  
Spun Yarns ◽  
Yarn Count ◽  
Wrap Angle

A computer simulation approach for engineering air-jet spun yarns is proposed, and the advantages of computer simulations over experimental investigations and stand-alone mathematical models are discussed. Interactions of the following factors in air-jet spun yarns are analyzed using computer simulations: yarn count and fiber fineness, fiber tenacity and fiber friction, fiber length and fiber friction, and number of wrapper fibers and wrap angle. Based on the results of these simulations, yarn engineering approaches to optimize strength are suggested.

Effect of position of the fiber transport channel on fiber motion in the high-speed rotor

2021 ◽  
pp. 004051752110018
Author(s):  
Rui Hua Yang ◽  
Chuang He ◽  
Bo Pan ◽  
Hongxiu Zhong ◽  
Cundong Xu
Keyword(s):  
High Speed ◽  
Channel Model ◽  
Three Dimensional ◽  
Discrete Phase Model ◽  
Transport Channel ◽  
Rotor Spinning ◽  
Fiber Motion ◽  
Discrete Phase ◽  
Airflow Field ◽  
Fiber Transport

The task of the fiber transport channel (FTC) is to transport the fibers from the carding roller to the rotor. Its geometric position in the spinning machine has a strong influence on the characteristics of the airflow field and the trajectory of the fiber motion in both the rotor and the FTC. In this paper, a three-dimensional pumping rotor spinning channel model was established using ANSYS-ICEM-CFD software with three different positions of the FTC (positions a–c). Further, the simulations of air distribution were performed using Fluent software. In addition, the discrete phase model was used to fit the fiber motion trajectory in the rotor. The simulation results showed that among the three types of FTC, position b is the optimal condition. The gradients of airflow velocity in the channel at position b were greater than those of the other two positions, which is conducive to straightening of the fiber.

scholarly journals Antimicrobial Properties and Release Profile of Ampicillin from Electrospun Poly(εepsilon;-caprolactone) Nanofiber Yarns

2010 ◽  
Vol 5 (4) ◽  
pp. 155892501000500 ◽  
Author(s):  
Hang Liu ◽  
Karen K. Leonas ◽  
Yiping Zhao
Keyword(s):  
In Vitro Release ◽  
Antimicrobial Properties ◽  
Fiber Surface ◽  
Electrospun Nanofibers ◽  
Release Profile ◽  
Burst Release ◽  
Spun Yarns ◽  
Surgical Sutures ◽  
Release Model

Poly(εepsilon;-caprolactone) (PCL) electrospun fibers containing ampicillin sodium salt have been produced and twisted into nanofiber yarns. The fiber diameters and crystallinity, the in vitro antimicrobial properties of the yarns, and the in vitro release of ampicillin from yarns containing various ampicillin concentrations are studied. Decreased fiber diameters and reduced diameter variation are observed with the addition of ampicillin salt into the polymer solution. The results from the zone of inhibition test of the yarns against both gram-positive Staphylococcus aureus and gram-negative Klebsiella pneumoniae indicate that the released ampicillin retains its effectiveness after the production processes, therefore the as-spun yarns are antimicrobial active. A burst release of ampicillin from the yarns has been observed in the first hour, and the release is almost completed in 96 hours. The burst release is believed to be due to the low compatibility of ampicillin with PCL, the accumulation of ampicillin on fiber surface and the small fiber diameters. An empirical release model is developed to describe the release profile. The results indicate that the electrospun nanofibers yarns will have a great potential to be used for biomaterials, such as surgical sutures, to decrease the surgical site infection rate.

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