Abstract
amorphous and crystal with an increase in draw ratios and finally increasing the tensile properties of the filament. An increase in the draw ratio caused a decrease in the linear density, thread twist, and breaking extension. Moreover, the tenacity, elastic modulus, and tension at the yield point were increased during the drawing process. During the sewing process, it was found that tensile fatigue and heat loading cause changes in the threads’ mechanical properties, depending on the draw ratio. After the sewing process, the tenacity, elastic modulus, and tension at the yield point had decreased, while the breaking extension increased for those drawn at higher draw ratios and decreased for those threads drawn at lower draw ratios [7]. The filament fibers have been drawn in various ways, from single-stage to three-stage drawing. In single-stage drawn fibers, a high tensile strength is obtained, whereas a high initial modulus is obtained for fibers drawn in three-stage drawing. According to the results, an important finding is that the three-stage drawing process has the potential to take high-modulus fibers. The increased fraction of taut-tie molecules is detected in three-stage drawn fibers, which is one of the important factors causing the high modulus achieved in fibers drawn in hot multistage [8].Our previous work has demonstrated the producing of filament yarns from used PET bottle and the production was successfully carried out. Poly ethylene terephthalate recycled (R-PET), Virgin fiber grade PET (FG-PET), and bottle grade PET (BG-PET) chips were spun on a high spinning speed machine)in 3000 and 3500m/min (into filament yarns, and the influence of high speed spinning on the fiber properties was studied [9]. it should be mentioned that there are few studies on R-PET and BG-PET spinning properties and filament yarn production [10]. Recycled PET fibers are 20% compared cheaper to other fibers for the same physical characters. It is clear that cost advantage and being ecologically friendly of the fiber are strong motives for increasing recycledPET fiber usage [11]. Given that the application of polyester used in bottles to produce fibers and in the production of filament yarn is a new and significant issue, it could be an interesting issue for environmental lovers. Therefore, many of the cases that are known for the new polyester filament yarn are unknown to the recycled filament yarn and require extensive research. The purpose of this work is to investigate of draw-ability of filament yarns and processing behavior of drawn yarn from recycled R-PET at the spinning and drawing machine and compare with FG-PET. The mechanism of fiber formation is analyzed using polarized and scanning Electron Microscopy (SEM), viscosity changes, X-ray diffraction, DSC, evaluation of tensile properties and shrinkage. Experimental Materials
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