High-strength poly(L-lactide) fibers by a dry-spinning/hot-drawing process. II. Influence of the extrusion speed and winding speed on the dry-spinning process

1990 ◽  
Vol 39 (6) ◽  
pp. 1275-1288 ◽  
Author(s):  
A. R. Postema ◽  
A. H. Luiten ◽  
H. Oostra ◽  
A. J. Pennings
Keyword(s):  
High Strength ◽  
Drawing Process ◽  
Extrusion Speed ◽  
Dry Spinning ◽  
Spinning Process ◽  
Hot Drawing

High-strength poly(l-lactide) fibres by a dry-spinning/hot-drawing process

Polymer ◽  
1987 ◽  
Vol 28 (10) ◽  
pp. 1695-1702 ◽  
Author(s):  
J.W. Leenslag ◽  
A.J. Pennings
Keyword(s):  
High Strength ◽  
Drawing Process ◽  
Dry Spinning ◽  
Hot Drawing

scholarly journals Transient Confinement of the Quaternary Tetramethylammonium Tetrafluoroborate Salt in Nylon 6,6 Fibres: Structural Developments for High Performance Properties

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2938
Author(s):  
Ahmed Dawelbeit ◽  
Muhuo Yu
Keyword(s):  
Phase Transitions ◽  
High Performance ◽  
Melt Spinning ◽  
Structural Phase ◽  
Tensile Modulus ◽  
High Strength ◽  
Strength Properties ◽  
Nylon 6,6 ◽  
Spinning Process ◽  
Hot Drawing

A temporary confinement of the quaternary tetramethylammonium tetrafluoroborate (TMA BF4) salt among polyamide molecules has been used for the preparation of aliphatic polyamide nylon 6,6 fibres with high-modulus and high-strength properties. In this method, the suppression or the weakening of the hydrogen bonds between the nylon 6,6 segments has been applied during the conventional low-speed melt spinning process. Thereafter, after the complete hot-drawing stage, the quaternary ammonium salt is fully extracted from the drawn 3 wt.% salt-confined fibres and the nascent fibres are, subsequently, thermally stabilized. The structural developments that are acquired in the confined-nylon 6,6 fibres are ascribed to the developments of the overall fibres’ properties due to the confinement process. Surprisingly, unlike the neat nylon 6,6 fibres, the X-ray diffraction (XRD) patterns of the as-spun salt-confined fibres have shown diminishing of the (110)/(010) diffraction plane that obtained pseudohexagonal-like β’ structural phase. Moreover, the β’ pseudohexagonal-like to α triclinic phase transitions took-place due to the hot-drawing stage (draw-induced phase transitions). Interestingly, the hot-drawing of the as-spun salt-confined nylon 6,6 fibres achieved the same maximum draw ratio of 5.5 at all of the drawing temperatures of 120, 140 and 160 °C. The developments that happened produced the improved values of 43.32 cN/dtex for the tensile-modulus and 6.99 cN/dtex for the tensile-strength of the reverted fibres. The influences of the TMA BF4 salt on the structural developments of the crystal orientations, on the morphological structures and on the improvements of the tensile properties of the nylon 6,6 fibres have been intensively studied.

Improved dry spinning process at elevated temperatures for making uniform and high strength CNT fibers

2018 ◽  
Vol 5 (6) ◽  
pp. 065036 ◽  
Author(s):  
Sathya Narayan Kanakaraj ◽  
Noe T Alvarez ◽  
Seyram Gbordzoe ◽  
Matthew Steven Lucas ◽  
Benji Maruyama ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
High Strength ◽  
Dry Spinning ◽  
Spinning Process

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.

Deformation Law of Cold Drawing Process of High Strength Bridge Cable Steel

2021 ◽  
Vol 1035 ◽  
pp. 801-807
Author(s):  
Xiao Lei Yin ◽  
Jian Cheng ◽  
Gang Zhao
Keyword(s):  
Strain Path ◽  
High Strength ◽  
Cold Drawing ◽  
Wire Drawing ◽  
Radial Deformation ◽  
Steel Bridge ◽  
Drawing Process ◽  
Single Pass ◽  
Potential Relationship ◽  
The Wire

High-strength cable-steel bridge is the “lifeline” of steel structure bridges, which requires high comprehensive mechanical properties, and cold-drawing is the most important process to produce high-strength cable-steel bridge. Therefore, through the ABAQUS platform, a bridge wire drawing model was established, and the simulation analysis on the process of stress strain law and strain path trends for high-strength bridge steel wire from Φ 12.65 mm by seven cold-drawing to Φ 6.90 mm was conducted. The simulation results show that the wire drawing the heart of the main axial deformation, surface and sub-surface of the main axial and radial deformation occurred, with the increase in the number of drawing the road, the overall deformation of the wire was also more obvious non-uniformity. In the single-pass drawing process, the change in the potential relationship of each layer of material was small, and multiple inflection points appeared in the strain path diagram; the change in the seven-pass potential relationship was more drastic, which can basically be regarded as a simple superposition of multiple single-pass pulls.

Polylactide. I. Continuous dry spinning–hot drawing preparation of fibers

1994 ◽  
Vol 54 (11) ◽  
pp. 1751-1757 ◽  
Author(s):  
I. Horáček ◽  
V. Kalíšek
Keyword(s):  
Dry Spinning ◽  
Hot Drawing
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