GÜNAYDIN KARAKAN GIZEM, ÇEVEN ERHAN KENAN Studiu privind proprietățile de rezistență la întindere și proprietățile de abraziune ale țesăturilor din fire de poliester de tip convențional și ignifuge 407-414 SI CHEN, XIAo-qING WANG Caracterizarea proprietăților de impact și postimpact (CAI) ale compozitelor cu structură 3D 415-420 PoLoNA DoBNIK DUBRoVSKI, ABHIJIT MAJUMDAR Efectele porozității deschise și ale parametrilor de construcție asupra factorului de protecție la ultraviolete al țesăturilor 421-426 DENIZ oZDEN, GULDEMET BASAL Filtru HEPA acoperit cu nanofibră de poliamidă 6/chitosan pentru controlul bioaerosolului 427-434 ABDUL WAqAR RAJPUT, USMAN ALI, AMIR ABBAS, RANA AMJAD, SIDRA SALEEMI Efectul densității lineare a semitortului asupra parametrilor de calitate ai firelor de bumbac 16 Nec 435-438 IULIANA IAŞNICU (STAMATE), GHEoRGHIŢA ToMESCU, oVIDIU VASILE, VIVIANA FILIP, SIMoNA MIHAI Analiza influenței utilizării materialelor textile recuperate asupra proprietăților acustice ale materialelor compozite 439-445 NESMA SAoUSSEN ACHoUR, MoHAMED HAMDAoUI, SASSI BEN NASRALLAH Efectul parametrilor de evaporare şi tricotare asupra comportamentului de permeabilitate: abordări experimentale și analitice 446-450 MARİJA SAVIC, DUSAN TRAJKoVIC, JoVAN STEPANoVIC, PETAR SToJANoVIC, MİRJANA KoSTIC, DİVNA MAJSToRoVIC Influenţa temperaturii şi vitezei de texturare asupra caracteristicilor fizico-mecanice ale firelor de poliamidă texturate prin procedeul de falsă torsiune 451-457 AKCAGUN ENGIN, ÖZ CEVIZ NURAY, YILMAZ ABDURRAHIM, MAZARI ADNAN Investıgarea proprıetăţılor de confort termıc ale jachetelor bărbăteştı dın materıale mono-şı multıstrat 458-463 LAURENŢIU-CHRISTIAN DINCĂ, HoRTENSIA-CLARA RĂDULESCU, DIoNEZIE BoJIN, EMILIA VISILEANU, ALINA PoPESCU, CARMEN-PYERINA GHIȚULEASA Analize statistice dimensionale comparative, prin SEM, între nanotratamentele de Cuo nemetalizate şi metalizate cu aur, de pe substraturi textile 464-469 ADRIAN SALISTEAN, DANIELA FARIMA, MIHAI CIoCoIU, CoNSTANTIN NITE optimizări ale proiectării parașutei de tip ram-air 470-473 HUA YUAN, JUNJIE ZHANG, YUN ZHANG, YAN HoNG, HoNGZHoNG ZHAo Efectele externalităților de aglomerare asupra productivității totale: exemple din industria textilă din China 474-480 Editatã în 6 nr./an, indexatã ºi recenzatã în:
Effect of false-twist texturing parameters on polyester yarn structure and properties were studied • Texturing speed and heater temperature significantly affected yarn structure and crimp properties • The effect of draw ratio and D/Y ratio on textured yarn structure and properties is less pronounced • Texturing speed can be significantly increased comparing to industrial standard (1100 vs. 700 m/min
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.
The variation of texturing process parameters within the limits of the industrial texturing machine brings about substantial structural changes of yarn characteristics. To obtain required characteristics of textured PA6.6 yarns for specific purposes, it is necessary to adjust the optimum process parameters. For that reason, in addition to modification of the quality of textured polyamide yarns, the aim of this work is to define the limit values of the texturing process. In this work, the influence of technical-technological parameters in the false twist texturing process on structural characteristics of polyamide yarns was studied. Partially oriented POY multifilament of 22f07×1 dtex fineness was textured under production conditions on the friction texturing machine ICBT, model FT 15 E3. Using low temperature long heaters, the influence of variations of the heater temperature, texturing speed and D/Y ratio on the properties of the textured yarn (filament density, the crystallinity degree, the orientation degree of individual filaments, end -NH 2 group content, -COOH group content and the total content of end groups) was investigated. Thereby, the values for the tension in the texturing zone (stretching) of 1.305 and in the winding zone of 0.954 were kept constant. The studied texturing parameters affect the change of above mentioned characteristics to a varying degree. For heater temperatures of 200, 210 and 220 °C, and D/Y ratio of 1.7, 1.9, 2.1 and 2.3, negative linear correlations were found between the speed of texturing -filament density, the speed of texturing -the degree of crystallinity and the speed of texturing -the degree of orientation of individual filaments. The correlation factor between the texturing process parameters and the analyzed properties of the yarn was determined. Based on the analysis of the obtained results, it can be concluded that with the established correlation between the speed of texturing and the investigated properties of the yarn, the correlation factor generally increases with the increase of D/Y ratio to 1.9 and 2.1, for the heater temperature up to 210 °C. However, in most cases the correlation factor decreases at the temperatures above 220 °C and higher values of the D/Y ratio. Therefore, in this study, the optimum temperature of the heater is 210 °C and D/Y ratio from 1.9 to 2.1, taking into account the selection of other values of texturing speed parameters and stretching.
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.
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