Dynamic analysis of melting in injection extruder / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 3 (09/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 3 (09/2000) . - p. 255-259 Titre : Dynamic analysis of melting in injection extruder Type de document : texte imprimé Auteurs : K. L. Yung, Auteur ; Y. Xu, Auteur ; F. Lau, Auteur Année de publication : 2000 Article en page(s) : p. 255-259 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Melting is one of the most important process in plastics processing. Admit the extensive use of plastic injection moulding machine in industry, most studies were on extruders which were simpler to model. This paper studies the melting process and derives its transient (dynamic) model for predicting the characteristics of melting in feeding stage of injection extruder. Based on this transient model, factors affecting the melting speed in injection extruders are exposed. Simulation results agree with the results from experiments. Note de contenu : - Heat transfer from heater to inner side of barrel - Heat transfer in melting film - Transient melting model - Simulation and further discussions DOI : 10.3139/217.1605 En ligne : https://drive.google.com/file/d/1yjOdGDdLZ-3nn_t9BRfWSdghREFwqKna/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15829 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001025	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Morphology and tensile properties as a function of welding current in thermoplastic induction welds / W. P. Ma in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 5 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 5 (2021) . - p. 499-507 Titre : Morphology and tensile properties as a function of welding current in thermoplastic induction welds Type de document : texte imprimé Auteurs : W. P. Ma, Auteur ; H. C. Bu, Auteur ; F. Y. Wang, Auteur ; H. Y. Yang, Auteur ; Y. Xu, Auteur ; X. H. Zhan, Auteur Année de publication : 2021 Article en page(s) : p. 499-507 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Morphologie (matériaux) Polyéther éther cétone Polymères -- Propriétés mécaniques Polymères -- Propriétés thermiques Soudage par induction Traction (mécanique) Index. décimale : 668.4 Plastiques, vinyles Résumé : Compared to other conventional joining methods, induction welding offers the superiority of avoiding mechanical degradation and satisfying the need for weight reduction in the aircraft industry. In this paper, a metal mesh was adapted as an induction component in the induction welding of polyetheretherketone (PEEK) with various currents. The effect of welding current on the microstructure and mechanical properties of the induction welding joint was further investigated. The results indicate that induction welding joints with the narrow thickness of the fusion zone and high tensile strength can be attained in the welding current range of 7.05 A to 11.05 A. However, when the current exceeds 13.91 A, the excessive heat input leads to the unsteady flow of PEEK or even thermal oxidative degradation and thermal decomposition, which increases the thickness of the fusion zone and reduces the tensile strength of the joint. In addition, the principal fracture mode presents cohesive failure, thereby promoting the tensile strength of the joint. Note de contenu : - EXPERIMENTAL METHODS : Materials and apparatuses - Design of experiment - Specimen preparation - RESULTS AND DISCUSSION : Weld morphology - Tensile properties - Table 1 : Thermal performance of PEEK - Table 2 : Test parameters of PEEK induction welding - Table 3 : The tensile force of Nos. 1 to 4 (N) DOI : https://doi.org/10.1515/ipp-2020-4016 En ligne : https://drive.google.com/file/d/1Dc5KCAgR5yqQaaXWUJ7kQ_tJ1lbfgVI6/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36517 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
23735	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Preparation and characterization of melamine modified urea-formaldehyde foam / Y. Ma in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 2 (05/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 2 (05/2013) . - p. 188-198 Titre : Preparation and characterization of melamine modified urea-formaldehyde foam Type de document : texte imprimé Auteurs : Y. Ma ; W. Zhang ; C. Wang ; Y. Xu ; S. Li ; F. Chu Année de publication : 2013 Article en page(s) : p. 188-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Caractérisation Combustion Formaldéhyde Fumée -- Analyse Isolants Mélamine La mélamine, de nom chimique 1,3,5-triazine-2,4,6-triamine, est parfois dénommée cyanuramide ou cyanurotriamine. Sa formule brute est C3H6N6. Les "résines mélamine-formaldéhyde" ou "mélamine-formol" (sigle MF) sont appelées "mélamine" dans le langage courant. Elles font partie de la famille des aminoplastes qui regroupe des résines thermodurcissables aminées, issues d'un comonomère tel l'urée ou la mélamine, parfois le thiocarbamide, le cyanamide hydrogène ou le dicyandiamide ; le second comonomère étant le formaldéhyde. Mousses plastiques Mousses plastiques -- Propriétés mécaniques Polymères Résistance à l'humidité Résistance à la compression Réticulants Surfactants Thermocinétique Urée Index. décimale : 668.9 Polymères Résumé : Melamine-urea-formaldehyde (MUF) foam was prepared using melamine modified urea formaldehyde resin. The effects of blowing agent, curing agent and surfactant on the properties of MUF foam such as apparent densities, compression strength, microstructure, fragility, limited oxygen index, thermal conductivity and formaldehyde emission were investigated. The best performance of MUF was obtained as the composition of blowing agent, curing agent and surfactant were 2.5 %, 18 % and 12 % respectively. The water resistance of MUF foam, contents of foam’s burning gas, curing mechanism and physical properties were also studied by Contact angle analyzer, TGA-FT-IR, FT-IR and 13C NMR. Note de contenu : - EXPERIMENTAL : Materials - MUF resin and foam preparation - Characterizations of MUF foam - SEM analysis of MUF foam - Contact angle measurements - TGA-FT-IR analysis of MUF foam - FT-IR analysis of MUF resin and foam - Liquid C NMR analysis of MUF resin - Solid C NMR analysis of MUF foam - RESULTS AND DISCUSSION : The influence of the blowing agent amount on the MUF foam properties - The influence surfactant amount on MUF foam properties - The influence curing agent amount on MUF foam properties - Water resistance of MUF foam - TGA-FT-IR analysis of MUF foam - FT-IR analysis of MUF resin and foam - C NMR spectrogram of MUF resin and foam DOI : 10.3139/217.2684 En ligne : https://drive.google.com/file/d/1CEUpiEWVqVziV5KzXAN1uOSCCzIUYd28/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18432 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15050	-	Périodique	Bibliothèque principale	Documentaires	Disponible

A transient melting model of polymer balls sliding against the barrel / K. L. Yung in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 2 (06/2001) . - p. 108-112 Titre : A transient melting model of polymer balls sliding against the barrel Type de document : texte imprimé Auteurs : K. L. Yung, Auteur ; Y. Xu, Auteur ; K. H. Lau, Auteur Année de publication : 2001 Article en page(s) : p. 108-112 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In the study of solid conveying process in plastics screw extrusion, a particle element numerical method enables us to simulate behavior of each solid particle during the process and takes into consideration the parameters of individual particle in the calculation. The melting of pellets in the solid conveying section is caused predominantly by heat from both friction and conduction through close contact. Experiments showed, melting happened before the solid plug was formed. Hence, when a particle element numerical method is used to simulate the conveying and melting process in the injection bellow, the analysis of melting process caused by solid particles sliding against wall of bellow should be included. Searching through the recent literature, no valid analysis of the transient close-contact melting process caused by viscous dissipation was found. This paper attempts to present an analysis of the melting process and derive an expression for describing the transient melting caused by both friction and close-contact heating. The melting model of polymer pellets sliding against the barrel was achieved by assuming the friction against the barrel as friction against an isothermal wall given the high heat conductivity of the barrel. To keep the expression simple, a constant temperature boundary condition is utilized for the wall which concurs with reality. DOI : 10.3139/217.1630 En ligne : https://drive.google.com/file/d/14ha-riWCPrWoijbglIUeV5F7_CQR9Tac/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15890 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001016	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 4 / 4)