A 3D numerical study of fluid flow and heat transfer in a single screw extruder / D. -S. Kwag in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 2 (06/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 2 (06/2002) . - p. 95-101 Titre : A 3D numerical study of fluid flow and heat transfer in a single screw extruder Type de document : texte imprimé Auteurs : D. -S. Kwag, Auteur ; M.-Y. Lyu, Auteur ; W.-S. Kim, Auteur Année de publication : 2002 Article en page(s) : p. 95-101 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A numerical study of three-dimensional fluid flow and heat transfer in the metering section of a single screw extruder has been performed. The screw channel was simplified by unwinding the channel and the coordinate system was fixed on the screw root in the present model. The pressure distribution over the inlet region was to be extrapolated from the solution of interior pressure. The prescribed mass flow rate was imposed on the outlet of the unwinding screw channel. The three-dimensional velocity fields, temperature, viscosity, and pressure profiles in the screw channel were calculated by using the commercial code, STAR-CD, based on the finite volume method. Some of the results of the present full 3D model were compared with the results from the marching-type 3D model. It is shown that the present work can capture the back flow by the pressure gradient near the screw root in the cases of small mass flow rates. There exist significant discrepancies in temperature between the marching-type 3D model and the present 3D model. The present work well describes the effects of heating-up through the circulation flow and viscous dissipation. The cross-section contours of velocities, temperature, viscosities and pressures along the down-channel direction are also shown in this study. DOI : 10.3139/217.1686 En ligne : https://drive.google.com/file/d/1WN8q1FlUj0fzKd4fk93iFe4m-NsS8Khh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15928 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001020	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Application of the PTT model for capillary extrusion of rubber compounds / S. H. Choi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 4 (09/2009)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIV, N° 4 (09/2009) . - p. 326-333 Titre : Application of the PTT model for capillary extrusion of rubber compounds Type de document : texte imprimé Auteurs : S. H. Choi, Auteur ; M.-Y. Lyu, Auteur Année de publication : 2009 Article en page(s) : p. 326-333 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Caoutchouc Elastomères -- Extrusion Extrusion capillaire Gonflement (physique) Phénomènes de relaxation (matériaux) Simulation par ordinateur Viscoélasticité Index. décimale : 668.9 Polymères Résumé : Rubber compounds have high viscoelastic property. One of the viscoelastic behaviors shown in profile extrusion is an extrudate swell and circulation flow at the corner of inside of die. Application of viscoelastic model to a capillary extrusion has been investigated in this study. Experiments and simulations have been performed using Fluidity Tester and commercial computational fluid dynamics (CFD) code, Polyflow respectively. Die swell of rubber compounds in a capillary die were predicted using a non-linear differential viscoelastic model, Phan-Thien and Tanner (PTT) model for various relaxation times and relaxation modes. As relaxation time and number of relaxation mode increase, die swell increases. The results of simulations were compared with the experiment. Pressure and velocity distributions, and circulation flows at the corner of reservoir have been analyzed through computer simulation. Two and three relaxation modes with large range of relaxation time examined in this study showed good agreement with experimental results of die swell and well represented circulation flow at the corner of reservoir in the capillary die. DOI : 10.3139/217.2172 En ligne : https://drive.google.com/file/d/1gPjMzxXA2tjrSuEJaB3HFkPoWSt4QHJG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6077 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011516	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Causes of cracks in petaloid bottom of carbonated PET bottle / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 1 (03/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 1 (03/2001) . - p. 72-78 Titre : Causes of cracks in petaloid bottom of carbonated PET bottle Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur ; H. C. Kim, Auteur ; J. S. Lee, Auteur ; H. C. Shin, Auteur ; Y. Pae, Auteur Année de publication : 2001 Article en page(s) : p. 72-78 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Petaloid design in bottom for carbonated PET bottles is wide spread. Crack problems exist in the bottom of the bottles. Through this paper we investigated the causes of bottom crack. We examined the physical properties of material and tensile yield stress variations according to the stretch ratio of PET. Then we analyzed stretch ratio and strength in the bottom of blown bottles. We also performed crack tests to observe crack phenomena. The distribution of effective stress and maximum principal stress were examined by computer simulation to seek the influence of bottom design on crack. We concluded that the bottom crack occurs not only because of insufficient stretch of PET but also coarse design of petaloid bottom. The stretch ratio at bottom in bottle blowing should be higher than strain hardening point of PET to have enhanced mechanical strength. The crack in the bottom of PET bottles occurred through crazing. The maximum principal stress at valleys in the petaloid bottom of bottles was higher than the other area in the bottom and this maximum principal stress strongly affected the crack in the bottom of bottles. DOI : 10.3139/217.1628 En ligne : https://drive.google.com/file/d/17GeWmzVSAXjGBIgIDJOEDHC_hPkaDv4k/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15887 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001015	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Effect of annealing conditions on thermal properties and crystallization behavior of poly(ethylene terephthalate) / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 2 (05/2010)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 2 (05/2010) . - p. 118-124 Titre : Effect of annealing conditions on thermal properties and crystallization behavior of poly(ethylene terephthalate) Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur Année de publication : 2010 Article en page(s) : p. 118-124 Note générale : Bibliogr. Langues : Anglais (eng) Résumé : Thermal properties and crystallization behavior of PET were investigated by controlling the annealing conditions, such as relative humidity, annealing temperature, and annealing time. The variations of moisture content, glass transition temperature (Tg) and cold crystallization temperature (Tcc) were analyzed after annealing the PET specimens. Crystallization processing was performed with annealed PET specimens, and then the degree of crystallinity and the heat distortion temperature (HDT) were examined. Moisture content in the PET specimens increased with increasing the relative humidity, annealing temperature, and annealing time. Tg and Tcc of the annealed PET specimens decreased with increasing moisture content. The degree of crystallinity increased as increasing moisture content in the PET specimens. Although the moisture contents in the specimens after annealing were the same, the degree of crystallinity varied. The degree of crystallinity was affected by residual stress for constant moisture content. The relaxation of residual stress in the PET specimens differed depending on the annealing conditions, and the maximum degree of crystallinity increased with decreasing residual stress in the PET specimens. Note de contenu : EXPERIMENTAL : Material and specimen - Measurement of HDT for crystallized PET - Annealing and analysis of annealed PET specimen - Crystallization and measurement of degree of crystallinity. RESULTS AND DISCUSSION : HDT in crystallized specimens - Moisture content in annealed specimens - 3.3 Tg and Tcc in annealed specimens - Degree of crystallinity according to annealing conditions - Relaxation of residual stress in annealed specimens - Relationship between crystallinity and residual stress. DOI : 10.3139/217.2290 En ligne : https://drive.google.com/file/d/1R0th_7gdYMEyoW1VNORBe1CPOORyjLjl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9325 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
012158	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigation of design parameters and novel design of petaloid PET bottles / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 3 (09/2002) . - p. 279-283 Titre : Investigation of design parameters and novel design of petaloid PET bottles Type de document : texte imprimé Auteurs : M.-Y. Lyu, Auteur ; Y. H. Kim, Auteur Année de publication : 2002 Article en page(s) : p. 279-283 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Carbonated soft drink (CSD) Poly(ethylene terephthalate) (PET) bottle contains pressurized liquid and its bottom design is petaloid in shape for self-standing. The trouble in this bottle is bottom cracking. In this study the design parameters of the petaloid bottom of the PET bottle have been investigated. Cracking test has been performed for different shapes of petaloid bottles and for several sizes of bottles, too. Through the cracking test, it has been concluded that the design parameters that affect the crack generation are clearance, foot length and valley width in the petaloid bottom. Computer simulation has been performed to seek for the optimum values of the design parameters that can reduce maximum principal stress concentration. Consequently the novel design of the petaloid bottom has been completed. DOI : 10.3139/217.1693 En ligne : https://drive.google.com/file/d/11rrnplScfgEd-9x5W_YLygg0eh8YFpqU/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16015 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001021	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Investigation of the mechanical properties and chemical resistance of PC/PBT/Impact modifier blends / M.-Y. Lyu in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

Permalink

Investigation of the structural robustness of deep depth injection mold with cavity pressure and mold design / S.-Y. Park in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

Permalink

Predicting the long-term creep behavior of plastics using the short-term creep test / S. D. Lim in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

Permalink

A study on the mechanical property and 3D fiber distribution in injection molded glass fiber reinforced PA66 / J. B. Ryu in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)  

Permalink

---

1 (1 - 9 / 9)