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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Development of a novel transcription molding process to fabricate sophisticated polymer products with precise microstructure and high transparency applicable to display devices and bio-chips / Hiroshi Ito in INTERNATIONAL POLYMER PROCESSING, Vol. XXII, N° 2 (05/2007)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXII, N° 2 (05/2007) . - p. 155-165 Titre : Development of a novel transcription molding process to fabricate sophisticated polymer products with precise microstructure and high transparency applicable to display devices and bio-chips Type de document : texte imprimé Auteurs : Hiroshi Ito, Auteur ; K. Yakemoto, Auteur ; T. Saito, Auteur ; I. Satoh, Auteur Année de publication : 2007 Article en page(s) : p. 155-165 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this study, we developed a novel transcription-molding process and experimentally discussed its validity for fabricating polymer products having the precise microstructure on the surface. The process was named "Melt-Transcription Process" which consists of two characteristic stages ; coating and compression. In the coating stage, a molten polymer is coated on the surface of a metal mold having the precise microstructure by a coating device specially designed in this study. The thickness of the coated polymer melt is typically 100µm or more. Immediately after coating, the coated polymer is compressed against the mold surface so as to make the polymer flow into the microstructure cavities engraved on the mold, and to fabricate the 3-dimensional structure of polymer products. The pressure required for compression is quite lower than that in conventional nano-imprinting process, because the molten polymer of high temperature is distributed in advance over the mold surface in the coating stage. The "Melt-Transcription Process" was applied to fabricate polymer products with the size of 150mm in length, 150mm in width and 1mm in thickness, having the microstructure of tens micrometers on their surface. Cyclo-olefin polymer (COP) and Polymethyl methacrylate (PMMA) were used as the polymer materials, and the dimensions and transcription ratios (the ratio of the height of the transcribed microstructure to the depth of the microstructure on the mold) of the molded microstructure were experimentally evaluated. As a result, by the Melt-Transcription Process, the microstructure was sufficiently transcribed on a very thin substrate of large surface area with high transcription ratios, typically 95 % or more, under relatively low compression pressure of less than 10MPa. DOI : 10.3139/217.0984 En ligne : https://drive.google.com/file/d/1orbulG_RMYHtEVlbGXprOlFzAwNo8AHB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2755 [article]

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Development of styrenic copolymers for improving heat resistance of poly(methyl methacrylate) / K. Nishino in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 3 (07/2016)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 3 (07/2016) . - p. 321-326 Titre : Development of styrenic copolymers for improving heat resistance of poly(methyl methacrylate) Type de document : texte imprimé Auteurs : K. Nishino, Auteur ; Y. Shindo, Auteur ; Y. Kurokawa, Auteur ; T. Takayama, Auteur ; Hiroshi Ito, Auteur Année de publication : 2016 Article en page(s) : p. 321-326 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Anhydride maléique Copolymères -- Propriétés mécaniques Copolymères -- Propriétés thermiques Copolymères styréniques Maléique, Acide Polyméthacrylate de méthyle Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, de l'anglais Poly(methyl methacrylate)) est un polymère thermoplastique transparent obtenu par polyaddition dont le monomère est le méthacrylate de méthyle (MMA). Ce polymère est plus connu sous son premier nom commercial de Plexiglas (nom déposé), même si le leader global du PMMA est Altuglas International9 du groupe Arkema, sous le nom commercial Altuglas. Il est également vendu sous les noms commerciaux Lucite, Crystalite, Perspex ou Nudec. Résistance thermique Rhéologie Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : Styrenic copolymers comprising styrene, methyl methacrylate, and maleic anhydride were developed to improve the heat-resistance property of poly(methyl methacrylate) (PMMA). The optical, thermal, and mechanical properties were examined for the blend specimens prepared by an injection-molding machine using melt-mixed samples. It was found that the copolymers, which were miscible with PMMA, increase the glass transition temperature and therefore the Vicat Softening temperature. Furthermore, the blends were completely transparent as similar to PMMA. Note de contenu : - Materials - Preparation of blends and moldings - Transparency - Dynamic viscoelastic properties - Capillary rheometer test - Thermal properties - Mechanical properties DOI : 10.3139/217.3180 En ligne : https://drive.google.com/file/d/1jSxxK1C7ht_kcQMIl3WiVuiyYKZUnDfI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26644 [article]

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High-speed melt spinning of polyethylene terephthalate with periodic oscillation of take-up velocity / W. Takarada in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 4 (12/2004)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIX, N° 4 (12/2004) . - p. 380-387 Titre : High-speed melt spinning of polyethylene terephthalate with periodic oscillation of take-up velocity Type de document : texte imprimé Auteurs : W. Takarada, Auteur ; K. Kasama, Auteur ; Hiroshi Ito, Auteur ; Takeshi Kikutani, Auteur Année de publication : 2004 Article en page(s) : p. 380-387 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : To investigate the non-steady-state melt spinning behavior, take-up velocity was varied periodically in the high-speed melt spinning process of polyethylene terephthalate and the timecourse changes of velocity and diameter of the spin-line were measured simultaneously. A numerical simulation program for the non-steady-state melt spinning process was also developed. In the range of relatively low take-up velocities, experimental results and results of numerical simulation of the non-steadystate melt spinning process showed a fair agreement, in that the amplitude for the variation of the reciprocal of the crosssectional area and that for the variation of velocity of the spin-line had a linear relation. An increase in the frequency of velocity oscillation led to a less significant variation in the thickness of as-spun fibers. On the other hand, there was a phase shift between the oscillation of take-up velocity and that of the reciprocal of cross-sectional area of the spin-line at the point of take-up. When take-up velocity was increased, starting of the orientation-induced crystallization along with the occurrence of neck-like deformation caused some characteristic behaviors such as significant increases in the amplitudes of velocity and diameter fluctuations at a certain region in the spin-line. Such behaviors could be reproduced in the numerical calculation by incorporating the stress dependent change of solidification temperature. It was also revealed that the orientation-induced crystallization has the effect of stabilizing the spinning system. DOI : 10.3139/217.1849 En ligne : https://drive.google.com/file/d/1auL-E5JomBFYy9ti7eoJAV8uR4Stq9Rh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3271 [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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Optical properties of HDPE in injection molding and injection press molding for IR system lenses / R. Kaneda in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 3 (07/2016)  

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Replication properties and structure of PC in micromolding with heat insulator mold using zirconia ceramic / Y. Kayano in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 3 (07/2011)  

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Structural development and properties of melt spun poly(butylene succinate) and poly(butylene terephthalate-co-succinate-co-adipate) biodegradable fibers / X. Q. Chi in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 1 (03/2006)  

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Thermal properties and morphology characteristics of a PP mono-filament and its foam / N. Chuapon in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

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