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A new style single screw extruder with improved plastification and output power / Eberhardt Grünschloß in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 291-300 Titre : A new style single screw extruder with improved plastification and output power Type de document : texte imprimé Auteurs : Eberhardt Grünschloß, Auteur Année de publication : 2002 Article en page(s) : p. 291-300 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A single-screw-extruder is presented, consisting of a barrel with grooved feed zone (helical grooves), a grooved melting zone (axial or helical grooves) and a barrier-screw with mixing and shearing elements. Compared with extruders with a smooth melting zone, significant process improvements are achieved regarding mass throughput, pressure build up, melt temperature, melt homogeneity, feed-zone cooling, processing wall-slipping polymers, abrasive wear, residence time, total degree of efficiency and economy. The processing principles of the new extruder are explained. Experimental results confirm the theoretical predictions. The system has proven to be very worthwile in more than 100 extrusion blow molding machines since 3 years. Note de contenu : - PROCESS ANALYSIS OF THE BARRIER SCREW : Barrier screw with smooth feed zone barrel - BARRIER SCREW WITH GROOVED PLASTIFICATION BARREL (HELIBAR) : Design principle - Process analysis - Process improvements - Economic aspect - EXPERIMENTAL INVESTIGATION OF HELIBAR : Results for the extruders DOI : 10.3139/217.1703 En ligne : https://drive.google.com/file/d/1Z_Sc5Crlrc83nmeUFCunNY72_O1FVVId/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16017 [article]

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Visualisation and analysis of the flow along the kneading block of a twin-screw extruder / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 301-308 Titre : Visualisation and analysis of the flow along the kneading block of a twin-screw extruder Type de document : texte imprimé Auteurs : Olga. S. Carneiro, Auteur ; Arnaud Poulesquen, Auteur ; Bruno Vergnes, Auteur ; Jose A. Covas, Auteur Année de publication : 2002 Article en page(s) : p. 301-308 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The flow of a silicone oil of high viscosity along a block of staggered kneading discs of a co-rotating twin screw extruder was investigated with the use of an acrylic transparent barrel. A digital video camera recorded the flow path of a red dye, dispersed in the silicone oil, along the screws and in the intermeshing zone. Different geometrical configurations were studied, namely various staggering angles (+30°, 90° and -30°) and thicknesses (7.5, 15.0 and 22.5 mm) of kneading blocks. The effects of these geometrical parameters on the pressure generation and filling ratio were investigated. It was observed that, even for negative staggering, the filling ratio of the kneading block was lower than one. Based upon these experiments, analytical expressions describing the filling ratio as function of geometry (staggering angle, thickness and number of discs) and operating conditions (feed rate and screw speed) were derived. Note de contenu : - MATERIALS AND EXPERIMENTAL PROTOCOL - EXPERIMENTAL RESULTS : Staggering angle α'=-30° - Staggering angle α'=+30° - Staggering angle α'=90° - CALCULATION OF THE FILLING RATIO : Negative staggering angle - Neutral staggering angle DOI : 10.3139/217.1708 En ligne : https://drive.google.com/file/d/1qhA7esmiVYtH1a-jB7TU6I2laXgA8QAk/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16018 [article]

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Resonant and invariant advection in single-screw extrusion / W. R. Hwang in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 309-317 Titre : Resonant and invariant advection in single-screw extrusion Type de document : texte imprimé Auteurs : W. R. Hwang, Auteur ; T. H. Kwon, Auteur Année de publication : 2002 Article en page(s) : p. 309-317 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this paper, we discussed how unmixed and well-mixed zones are determined by the practical design parameters of the Chaos Screw (CS) system for the single-screw extruder, e.g. the helix angle, the magnitude of adverse pressure gradient, and the fraction of no-barrier zone. The key concept is the frequency ratio distribution of the unperturbed system. Through the extensive three-dimensional numerical simulations with finite element methods and particle tracing techniques, successive creation and breakup of resonant orbits and KAM tori in terms of design parameters are presented. The results show that one can predict the spatial configuration of well-mixed and unmixed zones from the frequency ratio distribution and the amount of the perturbation strength. Finally, the exit time distributions caused by dynamical structures are discussed. Note de contenu : - MODELING : System - Frequency ratios - NUMERICAL ANALYSES : Numerical methods - Frequency ratio distribution - Overall structures - Four example cases - Longitudinal mixing and exit time distribution DOI : 10.3139/217.1710 En ligne : https://drive.google.com/file/d/1nN8xJRGclwO3jXKebPy5Ov67qO0M98mo/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16019 [article]

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PP-based model compounds as tools for the development of high-impact-ethylene-propylene copolymers / Markus Gahleitner in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 318-324 Titre : PP-based model compounds as tools for the development of high-impact-ethylene-propylene copolymers Type de document : texte imprimé Auteurs : Markus Gahleitner, Auteur ; A. Hauer, Auteur ; E. Ingolic, Auteur ; Klaus Bernreitner, Auteur Année de publication : 2002 Article en page(s) : p. 318-324 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The development of heterophasic PP-copolymers, which are necessary in many applications because of their specific property profile, requires large capacities in pilot plants (or at least in bench-scale reactors) for a systematic variation of the matrix and elastomer properties. A possible alternative are model compounds, where the different components are blended in an extruder. The possibility to evaluate three main influence factors on mechanics of such systems, namely the viscosity ratio between matrix and elastomer phase, the phase compatibility and the composition of the elastomer phase, is demonstrated in a series of investigations. Morphology investigations based on transmission electron micrographs have proven to be an indispensable tool for obtaining systematic information about such blend systems, which can be further used for the development of reactor-based systems. Note de contenu : - THEORETICAL BACKGROUND - EXPERIMENTAL WORK - TWO-PHASE MODEL SYSTEMS - PP/EPR BLENDS - THREE-PHASE MODEL SYSTEMS - PP/EPR/PE BLENDS : Viscosity ratio effects - Phase compatibility effects - Phase volume effects - Elastomer phase variation DOI : 10.3139/217.1709 En ligne : https://drive.google.com/file/d/16--XQA-xHT-8Tz6qrYqEvkHlGbd-Ebo5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16020 [article]

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Modelling of the flow in the distribution plate of a spin pack / Yves Bereaux in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 325-332 Titre : Modelling of the flow in the distribution plate of a spin pack Type de document : texte imprimé Auteurs : Yves Bereaux, Auteur Année de publication : 2002 Article en page(s) : p. 325-332 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A Computational Fluid Dynamics analysis of the flow through the distribution plate of a fibre spinning pack has been performed. The features of the flow that are relevant to polymer processing are addressed, such as the wall shear rate, residence time and dead zones. An analyticalmodel, that agrees very well with the calculations, is proposed. It also yields insight into the role played in the flow by different design parameters of the distribution plate. This model, primarily based upon a Newtonian fluid, is also extended to a shear thinning one. Note de contenu : - NUMERICAL MODEL : Governing equations - Finite element method - ANALYTICAL MODEL : Mathematical development - Residence time and wall shear rate - Effect of distributed inflows - Analysis of design parameters - Extension to non-newtonian fluid DOI : 10.3139/217.1712 En ligne : https://drive.google.com/file/d/1fVMMJtMI5IFGahqnPn75-X2HW7SPVwqg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16021 [article]

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Free-radical reactions and thermal effects in PE during pipe extrusion / Y. Lenger Özcanli in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 333-338 Titre : Free-radical reactions and thermal effects in PE during pipe extrusion Type de document : texte imprimé Auteurs : Y. Lenger Özcanli, Auteur ; Sh. V. Mamedov, Auteur ; T. Yalçinyuva, Auteur ; V. A. Alekperov, Auteur ; R. Yilgin, Auteur ; A. Durmus, Auteur ; S. Öksüz, Auteur ; B. Aktas, Auteur Année de publication : 2002 Article en page(s) : p. 333-338 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : In this study, various effects on the properties of the material, such as free-radical (FR) processes, oxygen induction time (OIT), melting temperature and melting heat are examined during several stages of the polyethylene (PE) pipe extrusion process. The spectra in the Electron Spin Resonance (ESR) are researched between 77 - 293 K and in a wide range of magnetic fields. At 77 K a triplet signal in ESR is observed. The parameters of the signal are ΔHm1 ≅ 1.4 - 1.6 mT; ΔHm² ≅ 1 - 1.2 mT; ΔHm3 ≅ 0.6 - 0.8 mT and g1 ≅ 2.020; g2 ≅ 2.011; g3 ≅ 1.99 and Hyper Fine Structure constant ΔH12 ≅ 2.1 mT; ΔH23 ≅ 5.3 mT. As the temperature increase from 77 K up to 293 K, the signal for g4 ≅ 2.02 (ΔHm4 ≅ 0.7 - 0.8) appears and intensity of signals increase. It is also thought that the triplet observed at 77 K belongs to macroradicals of alkyl (- CH2 - C H - C H2 ), alyl ( ~CH2 C HCH = CHCH2~ ), carboanions and the acyl ( H C O ) radicals of the fourth signal. At room temperature, all the FR's transform into peroxide radicals. The total concentration of the FR's is minimum at 463 K and increases at the outlet of the extruder and the pipe sample.It is observed that the OIT (Oxygen Induction Time) values decrease as one approaches the outlet of the extruder (from 20 - 30 to 10 - 15 minutes), while they increase for the processes of 433 K to 463 K. This event proves that the peroxide radicals form as one passes to room temperature. These results support those of the effects of the extrusion stage on the dynamic-mechanical characteristics [2]. Finally, FR's appear as a result of the breaking of the C - C bonds in the main polymer chains starting from the first step in the extrusion process (433 K) and in the later stages, due to the oxygen in the polymer structure, oxidation processes take place. Note de contenu : - EXPERIMENTAL METHOD AND PREPARATION OF THE SAMPLES - EXPERIMENTAL RESULTS : ESR results - The intensity of the signals - Results of DSC - Examination of the DSC melting heats - DSC crystallization phenomena DOI : 10.3139/217.1713 En ligne : https://drive.google.com/file/d/10Id3n8SM9liRO6-sTtZiJxWqATPvX3Yx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16022 [article]

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Simultaneous calculation of roll deformation and polymer flow in the calendering process / D. Mewes in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 339-346 Titre : Simultaneous calculation of roll deformation and polymer flow in the calendering process Type de document : texte imprimé Auteurs : D. Mewes, Auteur ; S. Luther, Auteur ; K. Riest, Auteur Année de publication : 2002 Article en page(s) : p. 339-346 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Calender units with rotating rolls are used to produce foils or sheets from polymer material with viscous or elastomeric flow properties. Up to now, the design process of calender units, the calculation of flow and pressure fields in the calender gap and the calculation of resulting deformations of the rotating rolls are implemented with different computer programs. In this work a design concept that integrates design and calculation programs is being developed in order to achieve integrated design and calculation. With this concept, it is possible to design calenders and calculate flow fields and deformations. After designing the rolls with the Computer Aided Design program Pro/Engineer, the flow field in the calender gap is calculated with the Finite Volume Method program CFX4, and the deformation of the rolls is calculated with the Finite Element Method program ANSYS. The iterative process of design, calculation and modification of shape is continued until sheets or foils of constant thickness leave the calender gap. The design concept has an object-oriented operational structure. The data transfer between the programs takes place via a central data base in STEP format. As examples, calenders with combinations of solid rolls are designed. The flow field in the calender gap is calculated for Newtonian and for viscoelastic fluids with use of an integral rheological equation of state. The flow field is compared to a measured flow field. The resulting deformations of the rolls are calculated and represented graphically. Furthermore, a design process for elastomer-coated rolls is implemented and their deformations as well as the interior stress fields are calculated. Note de contenu : - THEORY : Calculation of the flow field - Calculation of the roll deformation - CALCULATION OF THE FLOW FIELD : Newtonian fluids - Viscoelastic fluids - FLUID STRUCTURE COUPLING - CALCULATION OF THE DEFORMATIONS OF CALENDOR ROLLS : Solid rolls - Coated rolls DOI : 10.3139/217.1711 En ligne : https://drive.google.com/file/d/1UEN7Pl8jhnhlxaeszvuEKWZPfaAjimkq/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16037 [article]

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Investigation of bubble instabilities in film blowing process / J. Laffargue in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 347-353 Titre : Investigation of bubble instabilities in film blowing process Type de document : texte imprimé Auteurs : J. Laffargue, Auteur ; L. Parent, Auteur ; P. G. Lafleur, Auteur ; P. J. Carreau, Auteur ; Y. Demay, Auteur ; Jean-François Agassant, Auteur Année de publication : 2002 Article en page(s) : p. 347-353 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This paper describes an original on-line video device developed in order to study bubble instabilities occurring in the film blowing process, taking into account their three-dimensional behavior. For a linear low-density polyethylene, two forms of instabilities and combination have been observed : draw resonance and helical instability. These instabilities could be quantitatively described and differences in behavior could be assessed using real objective measurements and criteria. The influence of key processing conditions was investigated and the results showed that the instabilities are enhanced by increasing the draw ratio, blow up ratio and frost line height. These first results are in agreement with the majority of the results reported in the literature, but allow for a more accurate analysis of the phenomena. Note de contenu : - EXPERIMENTAL : The film blowing unit - On-line measurements - TYPICAL EXAMPLES : Stable bubble - Draw resonance instability - Helical instabilities - PRIMARY RESULTS : Objectives - Low FLH - High FLH - Construction of bubble stability map DOI : 10.3139/217.1704 En ligne : https://drive.google.com/file/d/1eUnHlunNemzsRduWllrIyGWzJa2MxID9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16038 [article]

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Flow visualization of filling process during micro-injection molding / S.-Y. Yang in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 354-360 Titre : Flow visualization of filling process during micro-injection molding Type de document : texte imprimé Auteurs : S.-Y. Yang, Auteur ; S. C. Nian, Auteur ; C. Sun, Auteur Année de publication : 2002 Article en page(s) : p. 354-360 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Micro-injection molding has been under development for the mass manufacture of micro parts. This paper presents fundamental research on the filling characteristics during micro-injection molding. Flow visualization was employed to observe the fast filling process. A lab-made impact type micro-injection machine was developed and used in this study. Filling of 4 x 4 x 0.2 mm3 and 2 x 2 x 1 mm3 cavities in quartz glass molds was recorded with a high-speed video camera. The effects of the processing conditions on the filling behaviors are systematically studied. The processing parameters include air pressure, mold temperature, and melt temperature. Based on the analysis of flow patterns, it was found that the melt fronts advanced quickly and filled the cavity in less than 0.1 seconds. The filling process can be divided into impact-filling and pressure-filling stages. Mold temperature and air pressure are found to be the dominant processing parameters. Note de contenu : - EXPERIMENTAL SET-UP : Impact type micro-injection machine - Mold construction - Image capture system and operation procedure - Processing conditions - RESULTS AND DISCUSSION : Flow visualization of the filling process during filling of the shell-shaped cavity - Flow visualization of the filling process during filling of the block-shaped cavity - Effects of processing conditions in filling behaviors during micro-injection molding - Effects of air pressure - Effects of mold temperature - Effects of melt temperature DOI : 10.3139/217.1706 En ligne : https://drive.google.com/file/d/1DCPLSdI11t9o9-8P3ETib79_x-4SfevY/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16039 [article]

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The role of tool/sheet contact in plug-assisted thermoforming / P. Collins in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 361-369 Titre : The role of tool/sheet contact in plug-assisted thermoforming Type de document : texte imprimé Auteurs : P. Collins, Auteur ; E. M. A. Harkin-Jones, Auteur ; P. J. Martin, Auteur Année de publication : 2002 Article en page(s) : p. 361-369 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Plug-assisted thermoforming produces a wide range of polymer products through a combination of deformation by air pressure and contact with tool surfaces. In this paper the role of tool/sheet contact in determining the process output is investigated. A combination of thermoforming, friction and heat transfer tests were carried out on common tool and sheet materials. The results show that the typical friction coefficients for the material combinations are within the range 0.1 to 0.3, but the values rise sharply on approaching thermoforming temperatures. Thermal imaging tests demonstrate that all of the plug materials significantly cool the heated sheet on contact, even over very short periods of time. The temperature of the plug is very important. At low plug temperatures heat transfer effects predominate, whereas at high plug temperatures friction effects predominate. A plug temperature of approximately 100°C balances these effects and creates the most effective material distribution. Note de contenu : - INTRODUCTION : Plug-assisted thermoforming - Process control - Thermoforming materials - Objectives - THERMOFORMING TESTS : Wall thickness distribution - Tool materials - Measurement of friction - Materials and methods - Results - Measurement of heat transfert - Thermal properties of tool materials - Test method - Results - Plugging tests - Test results DOI : 10.3139/217.1702 En ligne : https://drive.google.com/file/d/1wuvCG_6O04svfpmdPNOIbuQ3AE7_bG_n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16040 [article]

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A comparison of the axisymmetric and planar elongational viscosities of PE-LD / P. Beaupre in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 370-375 Titre : A comparison of the axisymmetric and planar elongational viscosities of PE-LD Type de document : texte imprimé Auteurs : P. Beaupre, Auteur ; M. Gupta, Auteur Année de publication : 2002 Article en page(s) : p. 370-375 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The elongational viscosities of a low density polyethylene in axisymmetric and planar flows are compared. The experimental data on entrance pressure loss is matched with the corresponding finite element predictions to estimate the parameters in the elongational viscosity model proposed by Sarkar and Gupta. The entrance losses in the capillary and slit rheometers are used to predict the elongational viscosities for axisymmetric and planar flows respectively. The power-law region of the axisymmetric as well as planar elongational viscosity is found to follow the time-temperature superposition principle. The vortices encountered in the flow near the abrupt contraction for the planar and axisymmetric cases are compared. The vortex near the abrupt contraction is found to reduce in size as the flow rate is increased for planar as well as axisymmetric entrance flow. Note de contenu : - Dependence of elongational viscosity on elongation mode - Entrance flow method for elongational viscosity estimation - Procedure for estimation of elongational viscosity parameters DOI : 10.3139/217.1714 En ligne : https://drive.google.com/file/d/1s9HUZUDvmNjMhSbzSnHFs-V26YWjcl4q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16041 [article]

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Polymer melt impregnation of glass roving / Phil J. Bates in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 376-386 Titre : Polymer melt impregnation of glass roving : Modelling and experimental Type de document : texte imprimé Auteurs : Phil J. Bates, Auteur ; X. P. Zou, Auteur Année de publication : 2002 Article en page(s) : p. 376-386 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Much attention has been recently focussed on the melt impregnation of thermoplastic polymers as a consequence of the difficulty involved in driving viscous polymer melt into a tightly packed fiber bundle. This work studies an impregnation process consisting a series of staggered cylindrical pins in a melt pool. A numerical model for evaluating the pressure generation in the wedge region between the roving/pin, the impregnation velocity of the melt through the glass mesh, and the resulting impregnation depth along the wedge is developed using relationships for pressure build-up in foil bearings and Darcy's law. The model results are compared with experimental melt impregnation data. The model adequately predicts the effect of melt impregnation process conditions on impregnation quality. Note de contenu : - EQUIPMENT, PROCEDURE AND MATERIALS : Equipment - Materials - Impregnation assessment - MODELLING : Assumptions - Pressure generation in the wedge region - Flow through the glass mesh - Impregnation depth and melt flow - Calculation of the impregnation number - Solving the system of impregnation equations - RESULTS AND DISCUSSION : Comparison of experimental and model results - Discussion of impregnation model - Kozeny constant value - Pressure and impregnation profiles DOI : 10.3139/217.1705 En ligne : https://drive.google.com/file/d/1JQ1yT3q90BnBLmJH3Yg1Jsq-yXdrnybb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16042 [article]

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Operational and design study of RIM machines / R. J. Santos in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 387-394 Titre : Operational and design study of RIM machines Type de document : texte imprimé Auteurs : R. J. Santos, Auteur ; A. M. Teixeira, Auteur ; M. R. P. F. N. Costa, Auteur ; J. C. B. Lopes, Auteur Année de publication : 2002 Article en page(s) : p. 387-394 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) data is presented and used to characterize the dynamic behaviour of the flow field in a RIM machine, and the main flow patterns and mixing mechanisms are examined and established. A two-dimensional CFD model is used for the simulation of mass transfer and chemical reaction in the mixing chamber of a RIM machine. Some design and operational parameters are considered and its influence on the mixing behaviour of a RIM machine is analysed. Note de contenu : - EXPERIMENT AND RESULTS : Experimental setup - LDA Data - PIV Data - CFD SIMULATION : Hydrodynamics - Mass transfer - Chemical reaction - OPERATIONAL AND DESIGN STUDIES : Reynolds number effects - Injector location effects - Froude number effects - Momentum ratio effects DOI : 10.3139/217.1707 En ligne : https://drive.google.com/file/d/1yIT3b64EPn5_izG_7y6gnA6GH_xVvi8_/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16043 [article]

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