An investigation on the effects of heat-setting process on the properties of polypropylene bulked continuous filament yarns

Sarkeshick, S.; Tavanai, Hossein; Zarrebini, Mohammad; Morshed, Mohammad

doi:10.1080/00405000701692429

Cited by 13 publications

(11 citation statements)

References 5 publications

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“…As far as the heatsetting process on the cotton/spandex is concerned, it may be stated that generally heat setting leads to a restructuring or recrystallisation with a higher degree of crystallinity and smaller crystallites with advanced orientation. In this recrystallisation process, at temperatures above 130 o C, a considerable portion of the amorphous region is also transformed into crystalline regions [25]. The increase of the CI indicates the improvement in the cellulose structure and finally contributes to enhancing the tensile strength of the treated fibre, the results of which were verified by Figure 1.…”

Section: Crystallinity Studymentioning

confidence: 62%

The Influence of Annealing Process on Crystallinity and Structural Properties of Cotton/Spandex Fabric

et al. 2017

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Abstract. This research aims to elucidate the crystallinity, structural and mechanical properties of cotton/spandex knitted fabric after conducting heat setting i.e., annealing process with optimized condition for the first time. Experimental results disclosed that, crystallinity index (CI) (%) of heat-treated cotton/spandex were increased with increased temperature and also mechanical properties i.e., tensile strength was improved as the temperature rose from 120 to 140ºC and decreased with augmenting temperature ranges, which is in good agreement with the findings of CI % through X-ray diffraction (XRD) patterns. The attendance of cellulose dehydration was further confirmed by Fourier transform infrared (FT-IR) spectra in order to observe the structural integrity.

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Section: Crystallinity Studymentioning

confidence: 62%

The Influence of Annealing Process on Crystallinity and Structural Properties of Cotton/Spandex Fabric

et al. 2017

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“…The heat setting process was carried out using an oven. These ranges have also been used in other researches (Everaert et al, 1999;Gupta, 2002;Sarkeshick et al, 2009;Statton et al, 1971). Yarn count (Denier), crimp contraction (%), and packing factor (%) were measured before and after heat setting for all samples.…”

Section: The Experimental Designmentioning

confidence: 99%

“…Pelisser, Neto, Rovere, and Pinto (2010) investigated the effect of different geometric polypropylene and synthetic fibers on plastic shrinkage cracking of cement. Samui, Prakasan, Chakrabarty, and Mukhopadhyay (2011) investigated hysteresis characteristics of high modulus low shrinkage polyester tire yarn and cord (Lin, 2007;Samuels, 1974;Sarkeshick, Tavanai, Zarrebini, & Morshed, 2009). Hui, Run-jia, Wei, and Qi-jun (2011) worked on the characterization of high modulus and low shrinkage polyester technical yarns using the simulation-curing method.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

“…In this research, the basic figures have been reported as an examples of relationships between parameters. In the literature, (Dadgar, Hosseini-Varkiyani, Merati, & Sarkheyli, 2013;Sarkeshick et al, 2009) mentioned increasing secondary yarn count, while other researches did not suggest an equation or optimization method with regard to other parameters. In fact, in Figure 1(a) when shrinkage occurred, the assumed shape of cylindrical yarns or filaments was reshaped to another cylindrical shape with shorter high and larger diameter.…”

Section: Rsm Modeling and Analyzingmentioning

confidence: 99%

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Comparison between artificial neural network and response surface methodology in the prediction of the parameters of heat set polypropylene yarns

Dadgar

Varkiyani

Merati

2014

The Journal of The Textile Institute

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In the present paper, a response surface model has been introduced to predict the geometrical parameters of heat set polypropylene pile yarns. The input factors of the presented model include yarn twist, initial yarn count, time, and temperature of heat setting and the response factors are yarn count, yarn shrinkage, crimp contraction and packing factor after the heat setting process. To analyse the effect of this process on the yarn parameters, the dry heat setting process has been applied to all samples at different times and temperatures using an oven equipped with air circulation because of better accuracy and control of temperature. The obtained results showed that there is a positive relation between time and temperature and output parameters. Finally, the predicting equations discussions about the optimum points for maximum shrinkage and interactions of parameters have been presented. Hence, due to some disability of the RSM method, an ANN model has been designed to predict the parameters at higher accuracy. The results of the accomplished ANN model represent a higher prediction correlation coefficient compared to RSM.

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“…Kitao et al 63 and Sarkeshick et al 64 reported the decrease of the tensile strength and the elastic modulus of the heat-set isotactic polypropylene fibers as a result of the annealing in the temperature range of 120-150 C 64 and at 140 C. 63 It seems that Sarkeshick et al 64 carried out heat-setting under relaxed condition rather than under constant length, which seems to have caused some loss of molecular orientation as a result of the physical shrinkage taken place during the heat setting process. In the case of the heat setting reported by Kitao et al 63 no mention was made about the heat setting procedure.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The influence of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers

Karacan

Benli

2011

J of Applied Polymer Sci

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An investigation was carried out on the effects of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers annealed in an air heated environment at temperatures ranging from 60 to 140 C. Analysis of the equatorial Xray diffraction traces showed the presence of a three phase system of amorphous-smectic-monoclinic forms and revealed the transformation of the metastable smectic form to the highly stable monoclinic form as the annealing temperature is increased, resulting in an enhanced degree of crystallinity and the crystallite size. The improvements in the degree of crystallinity and the crystallite size became more remarkable above 120 C. Evaluation of the crystallinity was carried out using an analysis of density, infrared spectroscopy, and X-ray diffraction methods whereas the state of the molecular orientation was evaluated using polarized infrared spectroscopy measurements only. Polarized infra-red spectroscopy measurements after the curve fitting procedure showed a slight increase of the molecular orientation of the helical chain segments present in the crystalline phase represented by the IR bands at 841 and 998 cm À1 whereas the amorphous structure represented by the IR band at 974 cm À1 showed no significant change with increasing annealing temperature. The improvement in the molecular orientation of the crystalline phase became more remarkable above 120 C. Tensile strength of the annealed fibers increased with increasing annealing temperature but the elongation at break and the initial modulus were not affected as much as the tensile strength.

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An investigation on the effects of heat-setting process on the properties of polypropylene bulked continuous filament yarns

Cited by 13 publications

References 5 publications

The Influence of Annealing Process on Crystallinity and Structural Properties of Cotton/Spandex Fabric

The Influence of Annealing Process on Crystallinity and Structural Properties of Cotton/Spandex Fabric

Comparison between artificial neural network and response surface methodology in the prediction of the parameters of heat set polypropylene yarns

The influence of annealing treatment on the molecular structure and the mechanical properties of isotactic polypropylene fibers

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