Capillary flow of hard-metal carbide powder compounds / B. Hausnerova in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 3 (09/1999) . - p. 254-260 Titre : Capillary flow of hard-metal carbide powder compounds Type de document : texte imprimé Auteurs : B. Hausnerova, Auteur ; P. Saha, Auteur ; J. Kubát, Auteur Année de publication : 1999 Article en page(s) : p. 254-260 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Experimental data relating to capillary flow of hard-metal carbide powders compounded with various polymeric binders are presented. Such powder - binder mixtures are used for the production of sintered hard-metal carbide components, mainly by injection moulding. In addition to measurements of their rheological behaviour in a capillary rheometer, the compounds were also subjected to thermo-gravimetric analysis in order to assess the ability of the binder to debind properly. The binder composition was varied from paraffin wax and its combinations with polyethyleneglycols to multi-component binders consisting of polyethyleneglycol, polyethylene, ethylene/vinyl acetate copolymer, and paraffin wax. Two kinds of hard-metal carbide powders differing in particle size distribution (uni-modal, bi-modal) were used. Although the compounds containing the simpler binder types had acceptable flow properties, their debinding behaviour was unsatisfactory. The multi-component compounds exhibited considerably better debinding; their flow was stable within a wide range of shear rates. Flow instabilities appearing at high solids loadings can limit the processability of the compounds used. DOI : 10.3139/217.1556 En ligne : https://drive.google.com/file/d/1c6uOA8iP5bmYr3V6Ofu9LYtervcxXaOt/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16136 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001009	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Fitting of K-BKZ model parameters for the simulation of thermoforming / P. Novotný in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 3 (09/1999) . - p. 291-295 Titre : Fitting of K-BKZ model parameters for the simulation of thermoforming Type de document : texte imprimé Auteurs : P. Novotný, Auteur ; P. Saha, Auteur ; K. Kouba, Auteur Année de publication : 1999 Article en page(s) : p. 291-295 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Thermoforming is characterized by large deformations of the polymeric material being processed. The simulation is complicated by the fact that an elastic material model cannot principally describe the thermoforming deformation precisely. In this respect non-linear and time-dependent viscoelastic behavior of the polymeric material has to be taken into account. In our research we used the K-BKZ model capable of describing viscoelasticity and large deformations. The parameters of this model were determined experimentally using a simple testing method. The method is derived from plug-assisted thermoforming. Computer analysis was used to evaluate the experiments: The tests performed were simulated using FEM (Finite Elements Method) repeatedly with different material parameters. The material parameters leading to a minimum sum of squares of differences between experimental and simulated values estimate the tested material behavior. It has been found that the final shape and the wall thickness distribution show a significant dependence on the material properties in case of deep thermoforming. Note de contenu : - Theoretical background of the K-BKZ model - Model parameter estimation-measurements - Model parameter estimation-fitting - Material properties influence DOI : 10.3139/217.1543 En ligne : https://drive.google.com/file/d/1dgJPEOVuz80zHMQYqB5Cu9LONKggq-6S/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16140 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
001009	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Numerical simulation of polymer coextrusion flows / M. Zatloukal in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 2 (06/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 2 (06/2001) . - p. 198-207 Titre : Numerical simulation of polymer coextrusion flows : A criterion for detection of "wave" " interfacial instability onset Type de document : texte imprimé Auteurs : M. Zatloukal, Auteur ; C. Tzoganakis, Auteur ; J. Vlcek, Auteur ; P. Saha, Auteur Année de publication : 2001 Article en page(s) : p. 198-207 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Non-isothermal calculation of flow history dependent viscoelastic stresses in a coextrusion die is performed using the 8-mode modified Leonov constitutive equation and the deformation rate field from finite element simulation. It is shown that a heuristic criterion based on the difference of normal stress differences across the layer interfaces in the merging area may be used to potentially detect the onset of interfacial instabilities. The developed technique can be a useful tool for coextrusion die design as well as for proper selection of materials and process conditions for coextrusion. DOI : 10.3139/217.1642 En ligne : https://drive.google.com/file/d/1UN4e12VUmFm7vhvvbZiX2PeBCieYN8zj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15900 [article]

Réservation

Réserver ce document

Exemplaires (1)

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

On PVT and rheological measurements of polymer melts / T. Sedlacek in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 3 (09/2005) . - p. 286-295 Titre : On PVT and rheological measurements of polymer melts : Correction of the hole fraction-viscosity relationship Type de document : texte imprimé Auteurs : T. Sedlacek, Auteur ; R. Cermak, Auteur ; B. Hausnerova, Auteur ; M. Zatloukal, Auteur ; A. Boldizar, Auteur ; P. Saha, Auteur Année de publication : 2005 Article en page(s) : p. 286-295 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The relation between PVT and rheological measurements of several polymer melts including polyethylenes, polypropylene, polystyrene, poly(methyl methacrylate), and polycarbonate has been taken into investigation. Pressure-temperature dependent viscosities, determined on rotational and backpressuremodified capillary rheometers, were fitted through the Carreau-Yasuda model. PVT data was analyzed by the help of the Simha-Somcynsky equation of state (SS EOS). The thermodynamical parameters of the SS EOS were connected to constantstress viscosity (experimental) and zero-shear viscosity (extrapolated). The Doolittle relationship was modified into the form of eta = C0 exp (C1 ln (h'/h)). The relation was employed and tested for the data evaluation. It proved to be a good tool for linearization of PVT and rheological data. DOI : 10.3139/217.1890 En ligne : https://drive.google.com/file/d/14kdLyE9sVuNFGcf1lzesA_oVBwwWLx7e/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3065 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
003050	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Pressure and temperature dependence of LDPE viscosity and free volume : The effect of molecular structure / T. Sedlacek in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 98-103 Titre : Pressure and temperature dependence of LDPE viscosity and free volume : The effect of molecular structure Type de document : texte imprimé Auteurs : T. Sedlacek, Auteur ; P. Saha, Auteur ; R. Cermak, Auteur ; M. Zatloukal, Auteur ; A. Lengalova, Auteur Année de publication : 2006 Article en page(s) : p. 98-103 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Temperature and pressure dependencies of shear and elongational viscosities were examined using rotational and capillary rheometers. Two different batches of the same polymer grade have shown that the molecular structure diversion significantly influences the magnitudes of pressure coefficients, which vary more than the temperature coefficients. The pressure effect on viscosity notably depends on the amount of long-chain branching in polymer. Further, the paper shows that pVT data analysis via the Simha-Somcynsky equation of state can be employed to reveal differences in temperature and pressure viscosity dependencies through the free volume fraction. DOI : 10.3139/217.1909 En ligne : https://drive.google.com/file/d/1jtQiPDSPz0bU_XPomjoz1W0m4jafYAl5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2902 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
004675	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Profile die design based on flow balancing / P. Saha in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)  

Permalink

Retrieval of biodegradable polymer and value added products from leather industry waste through process biotechnology : a progress review / S. Mukhopadhyay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCIX, N° 11 (11/2004)  

Permalink

Tensile strength characteristics of polymer melts / M. Zatloukal in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)  

Permalink

The effect of miscibility on rheological and mechanical properties of PCL/SAN blends / P. Saha in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 3 (09/1999)  

Permalink

Viscoelastic properties of flexible organic fiber composites / B. Hausnerova in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 1 (03/2005)  

Permalink

---

1 (1 - 10 / 10)