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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Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions / S. Yamada in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 4 (08/2015) . - p. 451-459 Titre : Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions Type de document : texte imprimé Auteurs : S. Yamada, Auteur ; K. Fukutani, Auteur ; K. Yamaguchi, Auteur ; H. Funahashi, Auteur ; K. Ebata, Auteur ; Hideyuki Uematsu, Auteur ; S. Tanoue, Auteur Année de publication : 2015 Article en page(s) : p. 451-459 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse numérique Calcul Distribution de temps de séjour Extrudeuse bi-vis Extrudeuse rotative Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : An intermeshing co-rotating twin-screw extruder is widely used for producing polymer composites. In order to satisfy properties of the composites, it is important to understand mixing performance of segments. In this study, we discussed mixing performance of special rotor segments commercially named VCMT (various clearance mixing technology) by using a numerical analysis method. The several tip clearances of VCMT work for achievement of both self-cleaning and effective mixing. We adopted a particle tracking method to obtain the following two evaluation indices; 1) residence time for the evaluation of its uniformity and 2) maximum 1st principal stress for the evaluation of dispersive mixing. And we evaluated mixing performance of VCMT by using probability distributions of each index. Moreover, we proposed weighted probability distributions as theoretically better evaluation. The probability distributions of VCMT were compared with those of two kinds of kneading disk segments (KDs). From the comparison, it was found that the probability of VCMT in large 1st principal stress region is higher than those of KDs. As a conclusion, VCMT has better mixing performance than KDs for the geometries and operating conditions that were investigated. Note de contenu : - ANALYSIS METHOD AND CONDITIONS : Fundamental equations and properties - Analysis conditions - Particle tracking method - Mixing evaluation indices - PREPARATION FOR NUMERICAL ANALYSIS-DETERMINATION OF COMPUTATIONAL MODEL - RESULTS AND DISCUSSION : Characteristics of residence time distribution - Dispersive mixing performance DOI : 10.3139/217.2972 En ligne : https://drive.google.com/file/d/1XgEHKyQAVgA3w-I0u05dph3hj0nadr47/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24854 [article]

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Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene / Hideyuki Uematsu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 3-10 Titre : Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene Type de document : texte imprimé Auteurs : Hideyuki Uematsu, Auteur ; T. Natsuume, Auteur ; S. Tanoue, Auteur ; Y. Iemoto, Auteur Année de publication : 2017 Article en page(s) : p. 3-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion capillaire Nanotubes Polyéthylène basse densité Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The effect of carbon nanotubes (CNTs) on the capillary extrusion behavior of low-density polyethylene (PE) was investigated. From the linear viscoelasticity and the morphology observation, it was found that the CNTs were well dispersed throughout the PE matrix and our system belonged to the semi-dilute regime. The strain hardening, which quantifies the extension of the PE chain, decreased by presence of CNTs in the uniaxial elongational deformation. In contrast, the normal stress difference was almost unaffected by CNTs in the shear deformation. The capillary extrusion behavior revealed that swell ratio decreased with increasing the CNT content although melt fracture was promoted. We summarize that the suppression of swell and promotion of melt fracture are attributable to the orientation of CNTs. Note de contenu : - EXPERIMENTAL : Materials - Measurements - RESULTS AND DISCUSSION : Rhelogical response under shear and elongational flow - Capillary extrusion behavior DOI : 10.3139/217.3062 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3062/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27973 [article]

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Effect of rubber reinforcement with filler on extrusion flow and extrudate swell / Hidenori Hirai in INTERNATIONAL POLYMER PROCESSING, Vol. 37, N° 2 (2022)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 37, N° 2 (2022) . - p. 226-235 Titre : Effect of rubber reinforcement with filler on extrusion flow and extrudate swell Type de document : texte imprimé Auteurs : Hidenori Hirai, Auteur ; Hideyuki Uematsu, Auteur ; Yuji Sakai, Auteur ; Shuichi Tanoue, Auteur Année de publication : 2022 Article en page(s) : p. 226-235 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc styrène-butadiène Charges (matériaux) Dioxyde de titane Elastomères -- Extrusion Extrusion capillaire Mesure Rhéologie Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Viscoélasticité Index. décimale : 668.4 Plastiques, vinyles Résumé : The extrusion process of silica rubber through a chemical reaction is unstable, and the flow mechanism in the extruder is still unclear. In this study, styrene-butadiene rubber (SBR) has been chosen as the matrix and the reinforcing effects of two different kinds of fillers, silica and titanium dioxide, have been investigated on SBR. Additionally, the effect of the properties of the SBR/filler composites on extrudate swelling has been examined. The reinforcing effect of the filler was confirmed by dynamic viscoelasticity, and the swell ratio was measured using a capillary rheometer. The results suggest that titanium dioxide has no reinforcing effect, as there is no interaction between titanium dioxide and the molecular structure of SBR. In contrast, there was a significant interaction between silica and SBR. It was found that the bound rubber, which is an SBR gel with restricted molecular chains, causes a reduction in the swell ratio, and this reduction effect is larger than that caused by filling the filler in the matrix. Furthermore, it was observed that this bound rubber deforms during flow and affects the extrudate swell phenomenon. Note de contenu : - EXPERIMENTAL : Materials - Dynamic viscoelasticity measurement - Morphology of filler in the rubber - Capillary extrusion - Bound rubber measurement - RESULTS AND DISCUSSION : Dynamic viscoelasticity and morphology - Effect of filler on capillary extrusion characteristics - Effect of bound rubber on capillary extrusion characteristics - Table : Composition of the compounds DOI : https://doi.org/10.1515/ipp-2022-4153 En ligne : https://drive.google.com/file/d/1vNb4ggmDR9uDhqNpZ1hISFfoI07hKyCf/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37627 [article]

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Effect of screw rotation speed on the properties of polycarbonate/vapor-grown carbon fiber composites prepared by melt compounding / Shuichi Tanoue in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 1 (03/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 1 (03/2014) . - p. 41-50 Titre : Effect of screw rotation speed on the properties of polycarbonate/vapor-grown carbon fiber composites prepared by melt compounding Type de document : texte imprimé Auteurs : Shuichi Tanoue, Auteur ; J. Nithikaranjanatharn, Auteur ; H. Okuzono, Auteur ; H. Ueda, Auteur ; Hideyuki Uematsu, Auteur ; Y. Iemoto, Auteur Année de publication : 2014 Article en page(s) : p. 41-50 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composites à fibres de carbone à croissance en phase vapeur Déformations (mécanique) Essais dynamiques Extrudeuse bi-vis Mouvement rotatoire Polycarbonates Rupture (mécanique) Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : The effect of screw rotation speed on the mechanical property and thermal conductivity of polycarbonate (PC)/vapor-grown carbon fiber (VGCF) composites prepared by a twin screw extruder was discussed in this paper. Two types of VGCF (VGCF-H, the aspect ratio of 40, and VGCF-S, the aspect ratio of 100) were used. In the tensile test, the breaking pattern of PC composite changed to brittle failures by adding VGCF-H irrespective of screw rotation speed. Young's modulus of PC/VGCF-H slightly increased with the screw rotation speed. On the other hands, the breaking strain of PC/VGCF drastically decreased above 150 min?1. Young's modulus of PC/VGCF-S slightly increased with screw rotation speed until 150 min?1, however, it decreased at 175 min?1. The thermal conductivity of PC/VGCF-H was independent of the screw rotation speed. In contrast, the thermal conductivity of PC/VGCF-S gradually increased with screw rotation speed until 150 min?1 and it also decreased at 175 min?1. From the SEM observation and rheological behavior, the dispersion state of VGCF-H in PC/VGCF-H was independent of the screw rotation speed. On the other hands, the network structures of VGCF-S were observed in PC/VGCF-S and the state of these network structures depended on the screw rotation speed. It was clarified that the mechanical property and thermal conductivity of PC/VGCF were attributable to the dispersion state of VGCF. Note de contenu : - Mechanical property and thermal conductivity - Evaluation of dispersion state of VGCF DOI : 10.3139/217.2799 En ligne : https://drive.google.com/file/d/1KAe1qYfjaYPZuimZ86w5le82-luirDQE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20574 [article]

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Thermal conductivity of polypropylene composites with combined boron nitride fillers / W. Cheewawuttipong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)  

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