Airflow simulation in nozzle for hairiness reduction of ring spun yarns. Part II: Influence of nozzle parameters

2006 ◽  
Vol 97 (1) ◽  
pp. 97-101 ◽  
Author(s):  
A. Patnaik ◽  
R. S. Rengasamy ◽  
V. K. Kothari ◽  
H. Punekar
Keyword(s):  
Spun Yarns ◽  
Airflow Simulation

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.

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.

A Study of the Structural and Physical Properties of Cotton-covered Nylon Filament Core-spun Yarns

1997 ◽  
Vol 88 (1) ◽  
pp. 12-20 ◽  
Author(s):  
Ali A.A. Jeddi ◽  
M. S. Johari ◽  
A. A. Merati
Keyword(s):  
Physical Properties ◽  
Spun Yarns

Analysis of Spun Yarn Failure. Part II: The Translation of Strength from Fiber Bundle to Different Spun Yarns

2005 ◽  
Vol 75 (10) ◽  
pp. 741-744 ◽  
Author(s):  
Anindya Ghosh ◽  
S. M. Ishtiaque ◽  
R. S. Rengasamy
Keyword(s):  
Fiber Bundle ◽  
Spun Yarn ◽  
Spun Yarns

22—FACTORS AFFECTING THE THICKNESS AND COMPRESSIBILITY OF WORSTED-SPUN YARNS

1967 ◽  
Vol 58 (7) ◽  
pp. 293-315 ◽  
Author(s):  
W. J. Onions ◽  
E. Oxtoby ◽  
P. P. Townend
Keyword(s):  
Factors Affecting ◽  
Spun Yarns

MDCT-Based 3D-1D Coupled Airflow Simulation In The Entire Conducting Airway Of Breathing Human Lung

2012 ◽  
Author(s):  
Jiwoong Choi ◽  
Youbing Yin ◽  
Merryn H. Tawhai ◽  
Eric A. Hoffman ◽  
Ching-Long Lin
Keyword(s):  
Human Lung ◽  
Conducting Airway ◽  
Airflow Simulation
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