Analysis of necking deformation behavior in high-speed in-line drawing process of PET by On-line diameter and velocity measurements / W. G. Hahm in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 536-543 Titre : Analysis of necking deformation behavior in high-speed in-line drawing process of PET by On-line diameter and velocity measurements Type de document : texte imprimé Auteurs : W. G. Hahm, Auteur ; Takeshi Kikutani, Auteur ; Hiroshi Ito, Auteur Année de publication : 2006 Article en page(s) : p. 536-543 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : To clarify the characteristic behavior of filament deformation in high-speed in-line drawing process of poly(ethylene terephthalate) (PET), on-line measurements of filament velocity and diameter were performed. In the process, velocity of the first godet roller was fixed at 2 km/min and the draw ratio was varied from 1.75 to 2.25 by changing the velocity of the second godet roller from 3.5 to 4.5 km/min. For comparison, on-line measurements were also performed for the high-speed melt spinning process at take-up velocities of 2 to 5 km/min. Diameter and velocity profiles of PET filament in the high-speed in-line drawing process indicated that the filament started to deform immediately after passing through the first godet roller (GR-1), and finished its deformation at 40 ~ 60 cm from the GR-1. The region of deformation became narrower and shifted toward the GR-1 with an increase in the draw ratio. Detailed analysis of necking deformation through simultaneous diameter measurements at two positions of close distance revealed that the position of necking deformation fluctuates along the drawing-line and its shape varies significantly depending on the direction of its movement. When the position of necking deformation was shifting toward the upstream, its shape was steeper than the one shifting toward the downstream. Results of the simultaneous on-line measurements of diameter and velocity supported this conclusion qualitatively. The analyzed maximum strain rate at the draw ratio of 2.0 reached a high value of 510 s–1. DOI : 10.3139/217.0980 En ligne : https://drive.google.com/file/d/1SjsRJUkkgGjjeOMtQzupGwiiYZ7EfOCS/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2809 [article]

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High-speed melt spinning of nanoparticle-filled high molecular weight poly(ethylene terephthalate) / K. H. Jang in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 4 (09/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 4 (09/2008) . - p. 370-376 Titre : High-speed melt spinning of nanoparticle-filled high molecular weight poly(ethylene terephthalate) Type de document : texte imprimé Auteurs : K. H. Jang, Auteur ; B. C. Kim, Auteur ; W. G. Hahm, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2008 Article en page(s) : p. 370-376 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : High molecular weight poly(ethylene terephthalate) (HMW-PET) (intrinsic viscosity of 0.809 dL/g) and its nanocomposites with 1 wt.% organoclay C12PPh-Cl– and 1 and 2 wt.% trisilanol isobutyl-poly(hedral oligomeric silsesquioxane) (POSS) were high-speed melt spun over the range of take-up speeds 1 to 4.5 km/min, and the effects of nanoparticle type on the fiber properties were investigated. The clay and POSS nanocomposites exhibited quite different melt spinning behaviors. The neat PET and PET/POSS nanocomposites showed a neck-like deformation distinctly from the take-up speed of 3.5 and 3 km/min while PET/clay nanocomposites did not show any neck-like deformation over the entire spinning speed range. In comparison with nanocomposite chips clay gave rise to re-aggregation of nanoparticles whereas POSS made little change in dispersion. Clay suppressed the crystallization of PET during high-speed spinning although it had more effective nucleation effects at the static state than POSS. Clay nanocomposite fibers gave lower modulus and higher elongation at break than PET fibers. On the other hand, the mechanical properties of POSS nanocomposite fibers were almost equal or slightly better than PET fibers. DOI : 10.3139/217.2127 En ligne : https://drive.google.com/file/d/1jKqhkaLeGeYbuMUJhOCRlqs6j52OWw8y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2618 [article]

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On-line measurement studies on orientation development and characteristic short-period diameter fluctuation in high speed in-line drawing of polyethylene terephthalate fiber / W. G. Hahm in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 3 (07/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 3 (07/2009) . - p. 280-287 Titre : On-line measurement studies on orientation development and characteristic short-period diameter fluctuation in high speed in-line drawing of polyethylene terephthalate fiber Type de document : texte imprimé Auteurs : W. G. Hahm, Auteur ; W. Takarada, Auteur ; Hiroshi Ito, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2009 Article en page(s) : p. 280-287 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : To investigate the orientation development behavior in high-speed in-line drawing process of poly(ethylene terephthalate) filament, simultaneous on-line measurements of diameter and optical retardation were conducted under various spinning and drawing conditions. In the measurement of optical retardation, the order of interference could be determined successfully from the successive assembly of phase shift versus filament diameter correlations collected at different measuring positions along the spinning and drawing lines. Analyzed birefringence increased steeply in the vicinity of neck-like deformation in the high-speed spinning line or in the vicinity of necking deformations in the in-line drawing line. It was verified that the thinning in the in-line drawing line is more effective for the development of molecular orientation in comparison with that in the high speed spinning line. Analysis on the time-course variations of diameter and birefringence in the vicinity of neck-like deformation caused by the fluctuation of its position along the spinning line was conducted to obtain detailed orientation development behavior. This analysis confirmed that the local birefringence is governed solely by the local diameter (or velocity) in the high-speed spinning line. On the other hand, it was relatively difficult to analyze the time-course variation of birefringence near the necking deformation in the in-line drawing line because of an overlapping of unique short-period diameter fluctuation of around 125 Hz, which corresponds to several tens of centimeters along the filament, occurring during the necking deformation. Such diameter fluctuation moves toward downstream at the speed of running filament, and therefore was speculated to be originated from the intrinsic characteristics of fiber materials. DOI : 10.3139/217.2266 En ligne : https://drive.google.com/file/d/1Ps62BmBg_LKIaGqD9O2ESXxRhvwvHqrv/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5932 [article]

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