Development of polymer extrusion extruder for evaluating with a small amount of polymeric material / Hideyuki Uematsu in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 434-440 Titre : Development of polymer extrusion extruder for evaluating with a small amount of polymeric material : Evaluation of shear viscosity and processability of film Type de document : texte imprimé Auteurs : Hideyuki Uematsu, Auteur ; Shuichi Tanoue, Auteur ; Y. Iemoto, Auteur ; M. Sugimoto, Auteur ; T. Taniguchi, Auteur ; K. Koyama, Auteur Année de publication : 2012 Article en page(s) : p. 434-440 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cisaillement (mécanique) Couches minces Couches minces multicouches Extrudeuses Matières plastiques -- Extrusion:Polymères -- Extrusion Polymères Rhéologie Viscosimétrie Index. décimale : 668.9 Polymères Résumé : We developed the extrusion system to evaluate the extrusion behavior such as the shear viscosity, which is one of basic properties, and the processability of mono/multilayer film with a small amount of polymeric material. In order to measure the shear viscosity, the gear pump, the return path and the pressure sensors were introduced into the extruder with intermeshing co-rotating twin screws. The viscosity could be evaluated on-line from the volumetric flow rate of molten polymer and the pressure drop in the return path before film processing. The capacity of gear pump, the shape and size of return path were optimized to evaluate the viscosity of polymeric material, which generally undergoes shear rate of 10 ~ 1 000 s–1in the film processing. The apparatus for mono and multilayer film processing consisted of two extruders including the multichannel feedblock and T-die with the manifold and land section. The compact feedblock was designed to receive two feedstreams, so that the product can have two layers. We investigated the on-line viscosity measurement methodology and the processability, which is the neck-in phenomenon for monolayer film and the interface stability for multilayer film, using typical polymer material of 30 grams at once. The viscosity evaluated with our system corresponded with the result of commercial rheometer. It was also confirmed that the processability of mono and multilayer film could be evaluated quantitatively with our system. DOI : 10.3139/217.2559 En ligne : https://drive.google.com/file/d/16yNx6ds331BcqZ4SKnk_Ycqx6lFcLtin/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15766 [article]

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Effect of electric current on beads formation in electrospinning of poly(Vinyl Alcohol) / Y. Kadomae in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 4 (09/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 4 (09/2008) . - p. 377-384 Titre : Effect of electric current on beads formation in electrospinning of poly(Vinyl Alcohol) Type de document : texte imprimé Auteurs : Y. Kadomae, Auteur ; M. Amagasa, Auteur ; M. Sugimoto, Auteur ; T. Taniguchi, Auteur ; K. Koyama, Auteur Année de publication : 2008 Article en page(s) : p. 377-384 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : We investigate effects of electric current on formations of beads in electrospinning by changing an electric conductivity of a poly(vinyl alcohol) (PVA) aqueous solution and spinning conditions, such as applied voltage, distance between a tip of needle and a collector, and relative humidity. From the results of experiments done by changing the conductivity of PVA aqueous solution and spinning conditions, we found that a beads formation is suppressed at a lower electric current. Furthermore, when the electrospinnings are performed at a certain constant electric current in various spinning conditions where the applied voltage and tip-collector distance are changed so as to give the same constant electric current, resultant PVA fibers have no beads and almost the same distribution of fiber diameter. DOI : 10.3139/217.2140 En ligne : https://drive.google.com/file/d/1x0rEhFgxys2QtcFY844ZmtpELKGJTBoW/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2619 [article]

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Non-destructive inspection technologies for VARTM composite structures / Y. Aoki in SAMPE JOURNAL, Vol. 46, N° 1 (01-02/2010)

[article]  inSAMPE JOURNAL > Vol. 46, N° 1 (01-02/2010) . - p. 22-27 Titre : Non-destructive inspection technologies for VARTM composite structures Type de document : texte imprimé Auteurs : Y. Aoki, Auteur ; Y. Nagao, Auteur ; M. Sugimoto, Auteur Année de publication : 2010 Article en page(s) : p. 22-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Composites Contrôle non destructif Imagerie ultrasonore Moulage par transfert de résine sous vide Ultrasons Index. décimale : 668.4 Plastiques, vinyles Résumé : This article describes some experimental findings obtained from NDI results of VARTM aircraft structures. Inherent inspection difficulties due to the VARTM process, such as fiber waviness, surface creases and wrinkles, are discussed and some technical suggestions are given to overcome them. It is demonstrated that pulsed thermography and 3-D (Array) ultrasonic system are applicable for the inspection of the structure manufactured by VARTM process. 3-D ultrasonic system provides much higher quality NDI results compared with conventional ultrasonic system. Furthermore, this systemshows the ability to inspect the thickness change or complex shape part in highly integral VARTM structure. Pulsed thermography is an effective NDI tool to evaluate the depth and the area of the flaw especially in large area because of its fast inspection rate and easy operation. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8149 [article]

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Paint/polymer interface structure for ABS injection moldings / Y. Aoki in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 4 (09/2011) . - p. 399-402 Titre : Paint/polymer interface structure for ABS injection moldings Type de document : texte imprimé Auteurs : Y. Aoki, Auteur ; M. Aita, Auteur ; Y. Mizuochi, Auteur ; T. Kinumura, Auteur ; M. Sugimoto, Auteur ; J. Takimoto, Auteur ; K. Koyama, Auteur ; H. Kiritani, Auteur ; M. Oomori, Auteur ; A. Hirashima, Auteur Année de publication : 2011 Article en page(s) : p. 399-402 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contraintes résiduelles Interfaces solide-liquide Matières plastiques -- Moulage par compression Matières plastiques -- Moulage par injection Matières plastiques -- Revêtement:Matières plastiques -- Peinture Orientation moléculaire (matériaux) Terpolymère acrylonitrile butadiène styrène Index. décimale : 668.9 Polymères Résumé : Structure of paint/polymer interface was investigated for the injection molded and compression molded ABS specimens. For the interface of the injection molded specimen, a peculiar “zigzag” structure formation of several tens µm in size was observed. In contrast, the interface structure was not observed for the compression molded specimen and injection molded specimen annealed above the glass transition temperature (Tg). These facts indicate that the interface structure is related to the residual stress and molecular orientation at the surface of the injection molding specimen, because both surface structures would be removed by annealing at temperatures above Tg. The interface structure was strongly dependent on the curing agent concentration. The depth of the structure decreased with increasing curing agent concentration because of decreasing in curing time. At painting temperature between 70 °C and 130 °C, the depth and pitch were constant. However, below 60 °C and above 140 °C, the depth and pitch were changed. These results strongly suggest that the interface structure is attributable to relaxation of the surface residual stress and molecular orientation by paint soaking. DOI : 10.3139/217.2433 En ligne : https://drive.google.com/file/d/1NMLtPwxOnp-pwA_kF5oNn2KXKMOCMQUz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12441 [article]

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