Effect of the chemical and morphological conditions of the die wall on the extrusion of linear polyolefins / H. J. Larrazabal in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 2 (05/2006)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 2 (05/2006) . - p. 132-140 Titre : Effect of the chemical and morphological conditions of the die wall on the extrusion of linear polyolefins Type de document : texte imprimé Auteurs : H. J. Larrazabal, Auteur ; John Vlachopoulos, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2006 Article en page(s) : p. 132-140 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : This study examines the effects of average surface roughness and composition of the die wall surface on the critical shear stress for the onset of instabilities in die extrusion. Increasing the average surface roughness of the die wall from 0.1 to 15 lm produced an increase of the critical shear stress for the onset of flow instabilities by as much as 20% during the extrusion of HDPE. The surface of the extrudates obtained with dies having an average surface roughness greater than 5 lm showed lines and grooves along the direction of extrusion. Chrome-plated and nickel-plated dies showed an average 28% increase in the critical shear stress as compared to conventional steel dies. The chemical composition of uncoated steel dies wall surfaces, including the presence of iron oxide, did not affect the critical shear stress for the onset of sharkskin significantly regardless of the type of resin used. DOI : 10.3139/217.0067 En ligne : https://drive.google.com/file/d/1Yxiub4WHfm2v8T1JdUQyyg_03cF_TsAl/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2906 [article]

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Flow instabilities of linear PE in capillary dies / H. J. Larrazabal in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 1 (03/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 1 (03/2002) . - p. 44-48 Titre : Flow instabilities of linear PE in capillary dies : Materials of construction of dies Type de document : texte imprimé Auteurs : H. J. Larrazabal, Auteur ; Andrew N. Hrymak, Auteur Année de publication : 2002 Article en page(s) : p. 44-48 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Flow instabilities of linear polyethylenes have been studied in capillary dies. The effect of shear stress temperature, molecular weight and material of construction of the dies on both the critical shear stress for the onset of slip and slip velocities have been evaluated. Flow curves were obtained using capillary dies with constant L/D and different diameters. Slip velocities were calculated using the Mooney technique [1] as a function of sheer stress. The onset of slip and slip velocity are affected by the material of construction of the capillary die. Flow instabilities were eliminated when brass dies were used under specific conditions. Instabilities persisted when naval brass and copper capillary dies were used. DOI : 10.3139/217.1673 En ligne : https://drive.google.com/file/d/1YsuibdPYsbZrDZ-ak1B_zmec4APkdO4R/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15960 [article]

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