A Statistical Analysis of the Influence of Multi-Stage Hot-Drawing on the Overall Orientation of Biodegradable Aliphatic-Aromatic Co-Polyester Fibers

2013 ◽  
Vol 8 (1) ◽  
pp. 155892501300800 ◽  
Author(s):  
Basel Younes ◽  
Alex Fotheringham ◽  
Hassan M. El-Dessouky ◽  
Ghassan Haddad
Keyword(s):  
Draw Ratio ◽  
Fractional Factorial ◽  
Regression Equations ◽  
Drawing Process ◽  
Plate Temperature ◽  
Drawing Temperature ◽  
Multi Stage ◽  
Relaxation Temperature ◽  
Hot Drawing ◽  
Temperature Relaxation

Biodegradable as-spun linear aliphatic-aromatic co-polyester (AAC) fibers were processed under a fractional factorial design as a function of hot-drawing conditions using appropriate experimental and statistical methodology. The multi-stage hot-drawing process and overall orientation of the biodegradable AAC fibers were characterized and statistically analyzed. The results obtained showed that the most effective and significant parameters influencing fiber overall orientation are the draw ratio and the drawing temperature. Birefringence is affected positively by draw ratio and plate temperature, and negatively by drawing temperature, the interaction between drawing stage and relaxation temperature, relaxation temperature and the interaction between draw ratio and spin finish. From results and analysis, a combination of factor levels was designed for controlling the birefringence of the material studied using the regression equations obtained. A new forecasting statistical model has been suggested for optimizing the drawing process effect. Such optimized (AAC) fibers could be used in agricultural, horticultural and other textile applications.

The Effect of Drawing Process on the Properties of Split-Film PTFE Fiber

2012 ◽  
Vol 602-604 ◽  
pp. 1946-1950 ◽  
Author(s):  
Xin Min Hao ◽  
Yuan Yang ◽  
Bin Xiang Huang ◽  
Lei Huang ◽  
Guo Jun Zhang
Keyword(s):  
Mechanical Properties ◽  
Draw Ratio ◽  
Breaking Strength ◽  
Three Dimensional ◽  
Drawing Process ◽  
Heat Setting ◽  
Elongation At Break ◽  
Ptfe Membrane ◽  
Hot Drawing ◽  
Temperature Controlled

From PTFE baseband prepared by three-dimensional drawing, after the processing of different temperature and time. And then by twisting, hot drawing and heat setting, the PTFE filament was prepared in appropriate tension conditions. The surface morphology of the resulting filaments was observed by SEM, the result shows that the uniformity of the PTFE membrane has been improved by using three-dimensional drawing process, hot drawing processes had a great effect upon the breaking strength and elongation at break of PTFE fibers. In order to keep ensure reasonable mechanical properties, the draw ratio in the range of 20 to 50 times to adjust the temperature controlled at 150°C to 300 °C.

A study of ethylene vinyl alcohol copolymer fiber for the drawing process

2016 ◽  
Vol 87 (9) ◽  
pp. 1081-1095
Author(s):  
Syang-Peng Rwei ◽  
Zhi-Feng Jue ◽  
Whe-Yi Chiang ◽  
Yu-Hua Chen ◽  
Jui-Hsiang Chen
Keyword(s):  
Stress Relaxation ◽  
Initial Stress ◽  
Vinyl Alcohol ◽  
Draw Ratio ◽  
Drawing Process ◽  
Ethylene Vinyl Alcohol ◽  
Drawing Temperature ◽  
Drawing Stress ◽  
Initial Modulus ◽  
Ethylene Content

This study investigates the effect of the drawing process of ethylene vinyl alcohol (EVOH) fibers on their physical properties. Three different ethylene contents, namely EV-32, EV-38 and EV-44, were used where the ethylene content has the order of EV-44 > EV-38 > EV-32. The result indicates that at the same drawing temperature and draw ratio, the online drawing stress of the fiber with high ethylene content is higher than that with low ethylene content. Moreover, the drawn EVOH fiber, at the drawing temperature of 80℃ and the draw ratio of 2.0, exhibits an optimal mechanical property. As the draw ratio increases, the online drawing stress, birefringence and initial modulus increase. Notably, unlike typical polymeric fibers, the glass transition temperature ( Tg) of the drawn EVOH fibers decreases with the draw ratio due to more water being absorbed by thinner fibers within the same number of samples. The draw ratio was found to have little effect on the melting temperature ( Tm). At the same draw ratio, the online drawing stress, birefringence, stress and initial modulus of the fiber EV-44, which has the highest ethylene content, is higher than those of EV-32 and EV-38. The creep strain of the drawn fibers EV-32 and EV-38 linearly increase with the drawing time when the applied stress maintains constant at 150 MPa, while an insignificant increase is observed for EV-44, suggesting that EV-44 is difficult to deform and has higher size stability. In the stress relaxation test, the elongation increases with the initial stress. At the same elongation percentage, the initial stress of the drawn fibers has the following trend: EV-44 > EV-38 > EV-32 and the stress relaxation time (τ) has the following trend: EV-44 > EV-38 > EV-32, indicating again that EV-44 is relatively difficult to deform during drawing. Finally, EV-44 fiber performed the best in the hot water resistance test.

Study on structures and properties of ultra-hot drawing UHMWPE fibers fabricated via dry spinning method

2018 ◽  
Vol 38 (9) ◽  
pp. 863-870 ◽  
Author(s):  
Xinwei Wang ◽  
Han Zheng ◽  
Yongfei Sun
Keyword(s):  
Molecular Weight ◽  
Draw Ratio ◽  
Average Molecular Weight ◽  
Raw Material ◽  
Drawing Process ◽  
Scanning Calorimetry ◽  
Fracture Force ◽  
Dry Spinning ◽  
Hot Drawing ◽  
Uhmwpe Fibers

Abstract High tensile strength ultra high molecular weight polyethylene (UHMWPE) fibers were prepared via the dry spinning method. Raw material was UHMWPE resin with 6 million viscosity-average molecular weight (Mv). Changes of morphology, mechanical properties, thermal properties and crystallization process of the fibers in the ultra-hot drawing process were studied by scanning electron microscopy (SEM), tensile tester, differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). Results show that there was a maximum value of fracture force at a draw ratio of 40 and excessive draw ratio destroyed crystal structures in fibers and led to a decrease in the fracture force value. A shoulder peak appeared in DSC curves of ultra-drawing samples and its peak value maintained at 154°C in different samples. In addition, three peaks can be observed in all WAXD patterns of drawing samples. The mechanism of microstructural changes during the hot drawing process was elucidated.

An in situ small-angle X-ray scattering study of the structural effects of temperature and draw ratio of the hot-drawing process on ultra-high molecular weight polyethylene fibers

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51125-51134 ◽  
Author(s):  
Minfang An ◽  
Haojun Xu ◽  
You Lv ◽  
Qun Gu ◽  
Feng Tian ◽  
...  
Keyword(s):  
Small Angle ◽  
Draw Ratio ◽  
Drawing Process ◽  
Structural Effects ◽  
X Ray ◽  
X Ray Scattering ◽  
Hot Drawing ◽  
Scattering Study ◽  
Effects Of Temperature

An in situ small-angle X-ray scattering study of the structural effects of temperature and draw ratio of the hot-drawing process on UHMWPE gel fibers was performed with equipment simulating the hot-drawing process on an industrial production line.

Response of fiber diameter to a continuously changing draw ratio in a laser drawing process

2015 ◽  
Vol 86 (10) ◽  
pp. 1074-1083 ◽  
Author(s):  
Munekazu Matoba ◽  
Yutaka Ohkoshi ◽  
Kyoung Hou Kim ◽  
Toshifumi Ikaga
Keyword(s):  
Draw Ratio ◽  
Fiber Diameter ◽  
Drawing Process

Study on the Crystallization Behavior of PAN Fibers during Hot-Drawing Process in Supercritical Carbon Dioxide Fluid with Different Strain

2020 ◽  
Vol 976 ◽  
pp. 84-89
Author(s):  
Meng Meng Qiao ◽  
Hai Juan Kong ◽  
Xiao Ma Ding ◽  
Zhi Feng Hu ◽  
Mu Huo Yu
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Carbon Fibers ◽  
Crystallization Behavior ◽  
Strength Analysis ◽  
Drawing Process ◽  
Hot Drawing ◽  
Pan Fibers ◽  
Supercritical Carbon

Hot-drawing of polyacrylonitrile (PAN) fibers is an important step in the production of carbon fibers. In this article, we investigated the effect of strain on the crystallization behavior and mechanical properties of PAN fibers treated in supercritical carbon dioxide (Sc-CO2) fluid. We mainly used the methods of X-ray diffraction (XRD), monofilament strength analysis and differential scanning calorimeter (DSC) to study the crystallization behavior, mechanical properties and thermal behavior of PAN fibers during hot-drawing process. The experimental results showed that the crystallinity and mechanical properties of PAN fibers both increased a lot under the action of strain during hot-drawing in Sc-CO2 fluid. This provides an important method for preparation of higher performance PAN precursor for PAN-based carbon fibers.

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