Experimental assessment of dispersion failure of glass fiber reinforced plastics in a twin screw extruder / K. Hirata in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 4 (08/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 4 (08/2013) . - p. 368-375 Titre : Experimental assessment of dispersion failure of glass fiber reinforced plastics in a twin screw extruder Type de document : texte imprimé Auteurs : K. Hirata, Auteur ; H. Ishida, Auteur ; M. Hiragohri, Auteur ; Y. Nakayama, Auteur ; T. Kajiwara, Auteur Année de publication : 2013 Article en page(s) : p. 368-375 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Composites à fibres de verre -- Extrusion Distribution et orientation des fibres Evaluation Extrudeuse bi-vis Extrusion -- Défauts Index. décimale : 668.4 Plastiques, vinyles Résumé : To investigate the conditions necessary for glass fiber bundle dispersion in the polymer compounding process, we developed a method for experimentally quantifying dispersion failure in this study. We employed a co-rotating twin-screw extruder in our experiment and investigated the dependence of frequency of occurrence of dispersion failure on screw configurations (a forward kneading disk (FKD) and a backward mixing screw (BMS) with different screw configurations), throughput (Q), and screw speed (Ns). From our experiments, we found that increasing the production rate promotes the occurrence of dispersion failure when a FKD is used. Dispersion failure is markedly suppressed when a BMS is used. We thus found that the production rate could be increased by using a BMS with a large length-to-diameter (L/D) ratio. Note de contenu : - EXPERIMENTAL : Materials - Compounding - Screw design - Dispersion failure measurement - Fiber length measurement - RESULTS AND DISCUSSION : Dispersion failure of glass fiber bundles - Glass fiber fracture DOI : 10.3139/217.2704 En ligne : https://drive.google.com/file/d/1Bx-EyImh5QLWNGrQwa9AMqc1adiWxHN4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19281 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15396	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Partially filled flow simulation using meshfree method for high viscosity fluid in plastic mixer / Kazuhide Sekiyama in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 2 (05/2019)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIV, N° 2 (05/2019) . - p. 279-289 Titre : Partially filled flow simulation using meshfree method for high viscosity fluid in plastic mixer Type de document : texte imprimé Auteurs : Kazuhide Sekiyama, Auteur ; S. Yamada, Auteur ; Takaharu Nakagawa, Auteur ; Yasuharu Nakayama, Auteur ; T. Kajiwara, Auteur Année de publication : 2019 Article en page(s) : p. 279-289 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Etat fondu (matériaux) Fluides, Mécanique des Galerkin, Méthode de En mathématiques, dans le domaine de l'analyse numérique, les méthodes de Galerkine sont une classe de méthodes permettant de transformer un problème continu (par exemple une équation différentielle) en un problème discret. Cette approche est attribuée aux ingénieurs russes Ivan Boubnov (1911) et Boris Galerkine (1913). Malaxeurs et mélangeurs Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : A novel simulation technique for the flow in plastic mixers based on Element-free Galerkin Method (EFGM) has been developed in this study. To improve the simulation accuracy, a “rearrangement” scheme has been employed which eliminates errors caused by the irregular distribution of data points. Through several numerical tests, the new simulation technique has been validated to be applicable to high viscosity fluid flow with enough accuracy. Furthermore, simulation examples for realistic mixers were carried out using the developed technique. From the results, it was found that the developed technique is capable to investigate the relationship between flow behavior inside realistic mixers and operating conditions. Note de contenu : - SIMULATION METHOD : Governing equation - Approximation of velocity field based on MLS interpolation - Discretization - Integration method - Time marching method - New "rearrangement" scheme for improving calculation accuracy - VALIDATION OF DEVELOPED METHOD : Comparison with experiment on rotating cylinder - Comparison with experiment on triangular-shaped rotor - RESULTS AND DISCUSSION OF FLOW SIMULATION INSIDE REALISTIC MIXERS : Numerical simulation condition - Results and discussion DOI : 10.3139/217.3727 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3727/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32404 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20883	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Tip-clearance effect on mixing performance of twin screw extruders / T. Ishikawa in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 4 (09/2006) . - p. 354-360 Titre : Tip-clearance effect on mixing performance of twin screw extruders Type de document : texte imprimé Auteurs : T. Ishikawa, Auteur ; K. Funatsu, Auteur ; T. Kajiwara, Auteur ; F. Nagano, Auteur Année de publication : 2006 Article en page(s) : p. 354-360 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In order to evaluate the tip-clearance effect on mixing, 3-D numerical simulations were applied to kneading block section of co-rotating twin screw extruders. The software we used was originally developed for non-Newtonian and non-isothermal flow analysis based on the finite element technique. The marker-particle tracking analysis was also developed in order to estimate the particle path, residence time distribution, stress and strain history, and so on. The stress distribution obtained by the above-mentioned simulations suggested the following mixing mechanisms. The kneading block with the small tip-clearance (TC) caused the bimodal stress distribution which had peaks in both high and low stress level. The marker-particles which overpassed the TC formed the peak at the high stress level and the other particles contributed to the peak at the low stress level. In other words, a large number of particles evaded the TC and it caused heterogeneous stress induced mixing. On the other hand, the large tip-clearance caused the narrow and sharp stress distribution because most of the particles passed over the TC. The stress level was not high, however, homogeneous stress induced mixing was expected. Since the tip-clearance applied a significant effect to the dispersive mixing, it should be optimised in accordance with the material design. DOI : 10.3139/217.0088 En ligne : https://drive.google.com/file/d/13R8qEuT69mmqcuw5raFBwfx3gVyzfEbO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2812 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
005535	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)