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New approach to melt pressure determination during screw channel flow / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 2 (2021)
[article]
Titre : New approach to melt pressure determination during screw channel flow Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2021 Article en page(s) : p. 185-192 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement bidirectionnel
Ecoulement unidirectionnel
Equations
Fluides newtoniens
Fluides, Mécanique des
Rhéologie
Vis d'extrusionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Basic equations describing steady, two-directional, isothermal and fully developed drag-pressure flow of generalized Newtonian fluid between parallel plates assumed as the appropriate flow model in flat, shallow screw channel, are given. It is shown that the flow output for any generalized Newtonian fluid in the two-directional case can be described by a simple expression with a few parameters depending in a complicated way on pressure gradient, channel geometry and constants of the constitutive model. The expression is also valid for unidirectional flow as the limiting case of the two-directional flow. The parameters must be determined as a rule with numerical methods. To simplify the practical calculations, a few (semi)analytical methods of parameters determination for unidirectional power law flow are discussed first. These methods make possible to calculate analytically the pressure gradient for known output that is typical of screw flow characterization. The results obtained for the unidirectional flow 1-D were generalized to describe the two-directional flow 2-D, which takes into account both longitudinal and transverse velocity components. The generalization is based on translation and dilation of the 1-D flow characteristics by introducing a few additional parameters, which are only dependent on the helix angle and power law exponent. It was found a very good agreement between exact numerical and approximate ( semi)analytical characteristics for both flows. Note de contenu : - Theoretical analysis
- Unidirectional flow (1-d)
- Two-directional flow (2-d)
- Table 1 : Coefficients of polynomials in two variables for parameters in 2-D flow
DOI : https://doi.org/10.1515/ipp-2020-4007 En ligne : https://drive.google.com/file/d/16sA9YpARbJTN3O4UCNXgr510Zuobz7lw/view?usp=shari [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36362
in INTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 2 (2021) . - p. 185-192[article]Réservation
Réserver ce documentPolymer plastication during injection molding / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)
[article]
Titre : Polymer plastication during injection molding : Part 1. Mathematical model Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2008 Article en page(s) : p. 252-262 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Index. décimale : 668.9 Polymères Résumé : The mathematical model of polymer plastication in a reciprocating screw injection molding machine is presented. It takes into account all characteristic features of working of a real injector, such as periodical action of the three zones screw, to-and-from screw motion with controlled stroke, static and dynamic melting, etc. Methods for description of time changes of the solid bed profile in the screw channel during injection cycle as a function of operating parameters were developed. Ways of determination of pressure and temperature profiles in the screw channel were also discussed. Methods of caculation of the most important flow characteristics such as plasticizing capacity, power requirements, screw torque, energy consumption were analyzed. Results were presented in a form, which is most convenient for numerical applications in computer simulation DOI : 10.3139/217.2041 En ligne : https://drive.google.com/file/d/1LuxUb-gLrr3OgjrRfGBT-Q5R6Ua7RpCb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2625
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 252-262[article]Réservation
Réserver ce documentPolymer plastication during injection molding / R. Steller in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)
[article]
Titre : Polymer plastication during injection molding : Part 2 : Simulations and experiments Type de document : texte imprimé Auteurs : R. Steller, Auteur ; J. Iwko, Auteur Année de publication : 2008 Article en page(s) : p. 263-269 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Moulage par injection Index. décimale : 668.9 Polymères Résumé : A computer program for the simulation of polymer plastication in screw injection molding machine created on basis of the theoretical model presented in part 1 of this paper is discussed. As simulation examples various process characteristics, e.g. solid bed, pressure and temperature profiles, are computed using the material parameters for high density polyethylene and three-zones-screw of diameter 20 mm. Effects of different geometric and operating parameters on plastication course are also demonstrated. Simulation results with respect to the screw rotation time are compared with experimental data measured for low density polyethylene, polypropylene, polystyrene, polyoxymethylene and polyamide 6. It was found that the computer program reflects correctly all features of a true plasticating system in injection molding machine. It provides also good agreement of model predictions with experimental data. DOI : 10.3139/217.2042 En ligne : https://drive.google.com/file/d/1DziAqcZR-ymmTIyz6-Ig28gS-zQIUvAs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2626
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 263-269[article]Réservation
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