scholarly journals Influence of heater temperature and texturing speed on the physical-mechanical properties of polyamide textured yarns in false-twist texturing process

2017 ◽  
Vol 68 (6) ◽  
pp. 451-457
Author(s):  
MARIJA SAVIC ◽  
◽  
DUSAN TRAJKOVIC ◽  
JOVAN STEPANOVIC ◽  
PETAR STOJANOVIC ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heater Temperature ◽  
False Twist

scholarly journals The effect of false-twist texturing parameters on the structure and crimp properties of polyester yarn

2017 ◽  
Vol 23 (3) ◽  
pp. 411-419 ◽  
Author(s):  
Petar Stojanovic ◽  
Marija Savic ◽  
Dusan Trajkovic ◽  
Jovan Stepanovic ◽  
Miodrag Stamenkovic ◽  
...  
Keyword(s):  
Draw Ratio ◽  
Degree Of Crystallinity ◽  
Speed Ratio ◽  
Polyester Yarn ◽  
Crystallinity Degree ◽  
Heater Temperature ◽  
Speed Up ◽  
Yarn Structure ◽  
The Degree Of Crystallinity ◽  
False Twist

In this paper, the effect of false-twist texturing parameters (texturing speed, heater temperature, draw ratio and disc-to-yarn speed ratio (D/Y ratio)) on the structure and crimp properties of polyester yarn has been studied using a high temperature heater and high texturing speeds. Textured yarn was analyzed and characterized in terms of the degree of crystallinity, degree of orientation and crimp properties (crimp contraction, crimp module and crimp stability). The most important parameters, significantly affecting yarn temperature and its uniformity and thus textured yarn structure and crimp properties, are texturing speed and heater temperature. Depending on these texturing parameters, the degree of crystallinity and orientation varied in the range of 24.48 to 36.66% and 0.371 to 0.595, respectively. The crimp characteristics increase with the increase in heater temperature, and decrease with the increase in texturing speed. The effect of draw ratio and D/Y ratio on the textured yarn structure and properties is less pronounced. Obtained results show that partially oriented polyester yarn used in this study can be textured at significantly higher texturing speed (up to 1100 m/min) than the standard texturing speed (up to 700 m/min) used for the yarn count examined.

scholarly journals Dependence of Structural Characteristics of Polyamide Textured Yarns on the Parameters of the False Twist Yarn Texturing Process

2017 ◽  
Vol 25 (0) ◽  
pp. 79-85 ◽  
Author(s):  
Dušan Trajković ◽  
Marija Savic ◽  
Mirjana Kostic ◽  
Divna Majstorovic ◽  
Petar Stojanovic ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Total Content ◽  
Disk Surface ◽  
Correlation Factor ◽  
Degree Of Crystallinity ◽  
Single Filament ◽  
Crystallinity Degree ◽  
Heater Temperature ◽  
End Groups ◽  
False Twist

In the false twist texturing process, due to the action of mechanical forces and heat, a disorientation of structural elements happens at all levels of the supramolecular structure. These changes are related to changes in the texturing parameters and mechanical properties of yarn. In this paper, investigated is the effect of technical-technological texturing parameters in the false twist texturing process on the structure of PA6.6 yarns. POY multifilament PA6.6 with a fineness of 22f07x1 dtex was used as experimental material. The yarn was textured on a friction texturing machine - ICBT model FT 15 E3. The exiting yarn speed (Vi) changed as 600, 700, 800 and 900 m/min; the heater temperature (T) was 200, 210 and 220 °C, and the ratio of the disk surface speed to the linear yarn speed (D/Y) was 1.9 and 2.1. The values of strain were kept constant at 1.305 (tension in texturing zone) and 0,954 in the winding zone. Analysed were the density, degree of crystallinity, degree of orientation, single filament diameter, the content of -NH2 and -COOH end groups, and the total content of end groups. From the results obtained it can be seen that the effect of the heater temperature is more significant than that of Vi and D/Y on the structural characteristics analysed. Analysing the experimental results it was found that linear positive correlations were established between the texturing speed and end (-NH2) groups, the texturing speed and end (-COOH) groups and the texturing speed and the total content of end groups. The correlation factor between the process parameters and yarn structural characteristics analysed is determined.

scholarly journals Effects of Processing Parameters on the Mechanical Properties of Aramid Air Textured Yarns for Protective Clothing

2018 ◽  
Vol 18 (2) ◽  
pp. 149-159
Author(s):  
Hyun Ah Kim ◽  
Seung Jin Kim
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
Process Parameters ◽  
Air Pressure ◽  
Thermal Shrinkage ◽  
Feed Ratio ◽  
Breaking Strain ◽  
Heater Temperature ◽  
Initial Modulus ◽  
Yarn Surface

Abstract This study examined the mechanical properties of a para-aramid filament according to the processing conditions of air-jet textured yarns (ATY). The specimens were prepared by changing the yarn speed, over feed ratio, air pressure, and heater temperature, which are important processing factors in the ATY process. The basic physical properties of the ATY, such as denier, tenacity, breaking strain, and initial modulus, were measured and their thermal shrinkage, such as dry and wet shrinkage, were measured to determine the thermal stability of the aramid ATY. In addition, the instability of para-aramid ATY were measured and assessed with the loop formation of ATY, according to the ATY process parameters. An examination of the effects of process parameters on the physical properties of aramid ATY revealed the core overfeed and air pressure to be the main factors. A high core overfeed and air pressure make the aramid ATY crimpy in the yarn core and entangle the fluffy loops on the yarn surface, resulting in an increase in the yarn linear density and breaking strain as well as a decrease in the tenacity and initial modulus. In contrast, these yarn physical properties were unaffected by the yarn speed, heater temperature, and wetting treatment. In addition, the dry and wet thermal shrinkage were unaffected by the process parameters of ATY. On the other hand, the instability decreased with increasing core overfeed and heater temperature and increased with increasing air pressure. These results showed that a high core overfeed makes the aramid ATY crimpy with an entangled yarn structure, and high air pressure helps provide small loops on the yarn surface. Finally, a high heater temperature makes the crimpy ATY structure more stable due to the strong heat set, which results in low instability.

Mechanics of Texturing Thermoplastic Yarns

1976 ◽  
Vol 46 (8) ◽  
pp. 599-610 ◽  
Author(s):  
Stanley Backer ◽  
Wen-Long Yang
Keyword(s):  
Steady State ◽  
Thermomechanical Behavior ◽  
Cold Region ◽  
Heater Temperature ◽  
Heating And Cooling ◽  
Steady State Operation ◽  
Single Heater ◽  
False Twist

This is a report on the effect of machine settings and filament properties on PET threadline behavior in single-heater false-twist texturing. Filament migration upon yarn entry to the cold region is shown to persist throughout the texturing zone, but some added migration is evident over the heater. Threadline tension, as a function of heater temperature, closely follows the pattern of thermomechanical behavior of untwisted feed yarn. Added twist, in commercial range, reduces threadline tensions. Tension ratio also falls with twist increase. Configuration of threadline is studied throughout the texturing zone as a function of twist, and the effect of line buckling is noted. Minimum heating and cooling times for steady-state operation and for maximum product crimp are noted.

scholarly journals Investigating the Effect of False Twist Texturing Process on the Color Coordinates Variation of Spun-dyed Polyester Filament Yarns

2011 ◽  
Vol 6 (3) ◽  
pp. 155892501100600 ◽  
Author(s):  
Mohammad Amani Tehran ◽  
Bahareh Azimi ◽  
Mohammad Reza Mohades Mojtahedi
Keyword(s):  
Tensile Properties ◽  
Draw Ratio ◽  
Processing Parameters ◽  
Color Variation ◽  
Color Coordinates ◽  
Heater Temperature ◽  
Polyester Filament ◽  
False Twist

In this study, color coordinates variation of spun-dyed polyester filament yarns subjected to the false twist texturing process was investigated. Furthermore, the effect of different processing parameters including D/Y ratio, twist, heater temperature, texturing speed, overfeed, the draw ratio and intermingling process on the color coordinates variation of textured yarns was studied. Finally, the magnitude of color variation was analyzed by studying the structure, crimp and tensile properties of the yarns. The results show that the nature of texturing and intermingling process had a significant effect on the color variation of yarns but different processing parameters had no significant effect. The level of these variations can be expressed by observing the fiber geometry change along the texturing process.

scholarly journals The influence of texturing process parameters on yield points and breaking forces of pes filament yarns

2018 ◽  
Vol 69 (04) ◽  
pp. 281-286
Author(s):  
STOJANOVIĆ PETAR ◽  
TRAJKOVIĆ DUŠAN ◽  
STEPANOVIĆ JOVANA ◽  
RADMANOVAC NATAŠA ◽  
STEPANOVIĆ JOVAN
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Mechanical Characteristics ◽  
Heater Temperature

An analysis of the mechanical properties of textured PES yarns shows that the texturing speed has a significant effect on these properties. The results showed that with the increase in the texturing speed, a decreasing trend was observed in the breaking forces of the analyzed textured PES yarns at stretching degrees of 1.665 and 1.685. Some deviations of the results were found in the textured PES yarns with the applied stretching degree of 1.675. Also, the results showed that at a stretching degree of 1.685, the analyzed yarns generally have higher values of breaking forces. Applying a higher degree of stretching of PES filament yarns improves the orientation of molecular chains in the direction of the stretching force, which contributes to better mechanical characteristics of textured PES yarn. In addition, the results of the analysis of the influence of the first heater temperature show that, at higher temperatures, the textured PES yarns with higher values of breaking forces are produced. The results obtained were used to suggest the equations for predicting the yield points and breaking forces of textured PES filament yarns depending on the process parameters of production.

Prediction of False Twist Textured Yarn Properties by Artificial Neural Network Methodology

2013 ◽  
Vol 8 (3) ◽  
pp. 155892501300800 ◽  
Author(s):  
Bahareh Azimi ◽  
Mohammad Amani Tehran ◽  
Mohammad Reza Mohades Mojtahedi
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Process Parameters ◽  
Heater Temperature ◽  
Yarn Properties ◽  
Artificial Neural ◽  
Working Parameters ◽  
False Twist

The false twist texturing method is one of the most common texturing techniques. This process depends on parameters such as tension, twist, and heater temperature. As false-twist texturing is a process which includes close interactions between machine working parameters and textured yarn properties, the effect of process parameters on yarn properties have been widely investigated. In this study the effect of first heater temperature, setting overfeed, and D/Y on the tenacity of set yarns and the effect of twist, texturing speed, and first heater temperature on crimp stability of stretch yarns are predicted using artificial neural network methodology.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

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