Feeding an extruder of a modified feed zone design with poly(vinyl chloride) pellets of variable geometric properties / Janusz W. Sikora in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 3 (07/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 3 (07/2014) . - p. 412-418 Titre : Feeding an extruder of a modified feed zone design with poly(vinyl chloride) pellets of variable geometric properties Type de document : texte imprimé Auteurs : Janusz W. Sikora, Auteur Année de publication : 2014 Article en page(s) : p. 412-418 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Débimétrie Ecoulement visqueux Extrudeuse bi-vis Extrudeuse monovis Granulés plastiques Température Index. décimale : 668.4 Plastiques, vinyles Résumé : The extrusion process is greatly affected by both feed zone geometry and dimensions of pellets fed into the hopper. The paper presents the results of studies undertaken to investigate the effect of both the dimensions of a feed pocket made in the barrel below the feed opening and pellet length on the single-screw extrusion process for plasticized poly(vinyl chloride). The dependencies of the extrudate temperature, extruder screw torque, polymer mass flow rate and unit energy consumption supplied to the extruder on the above mentioned variable factors were determined. It has been found that the most advantageous solution for the investigated screw speed range is to run the extrusion process at the highest screw speeds possible, feed the extruder with pellets whose length is similar to their diameter, and use the feed pocket in the barrel. DOI : 10.3139/217.2860 En ligne : https://drive.google.com/file/d/1Qn8XHvFUSJtac79tVf1do2E_vpz6XcrC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21739 [article]

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Impact of feed opening width and position on PVC extrusion process effectiveness / Janusz W. Sikora in INTERNATIONAL POLYMER PROCESSING, Vol. XXVIII, N° 3 (07/2013)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVIII, N° 3 (07/2013) . - p. 291-299 Titre : Impact of feed opening width and position on PVC extrusion process effectiveness Type de document : texte imprimé Auteurs : Janusz W. Sikora, Auteur ; B. Samujlo, Auteur Année de publication : 2013 Article en page(s) : p. 291-299 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Extrudeuse bi-vis Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : The influence of the feed opening axis width and position in relation to the plasticizing system axis on the effectiveness of the extrusion process of poly(vinyl) chloride has been studied. The research was conducted on the extrusion line for profiles with the extruder of the screw diameter 25 mm and L/D ratio = 25. In the extruder, the extruder head was mounted with a die of a rectangular cross-section shape for extruding a sheet of a defined width and thickness. The extruder was adapted for mounting five feed segments in the feed zone of the plasticizing unit; the segments differed from one another in terms of their feed opening width, the values of which were 0.6 D, 0.7 D, 0.8 D, 0.9 D and 1.0 D, respectively, whereas the values of the longitudinal axis shift of the opening relative to the longitudinal axis of the plasticizing unit were 0.2 D, 0.15 D, 0.10 D, 0.05 D and 0.0 D, respectively, which corresponded to 5 mm, 3.75 mm, 2.5 mm, 1.25 mm and 0 mm, respectively. The effectiveness of the polyvinyl chloride extrusion process was determined by dependences of extrudate temperature, extruder screw torque, polymer mass flow rate, power supplied to the extruder and conveyed by the polymer, unit energy consumption and energy efficiency of the extrusion process on the feed opening width and its axis position relative to the plasticizing unit axis, at different values of the screw rotational speed. It was stated that the width and position of the feed opening in relation to the plasticizing system axis can be adjusted in such a way that the extrusion process will be the most effective and other conclusions were also drawn. Note de contenu : - Research objective - Material - Test stand - Investigated factors - Test description DOI : 10.3139/217.2729 En ligne : https://drive.google.com/file/d/1IfYMsmED7TwqrNfBqopq25StqZ0RsORy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19018 [article]

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The mechanical properties of plasticized PVC processed in an extruder with a modified feed zone / Janusz W. Sikora in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 3 (07/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 3 (07/2015) . - p. 359-365 Titre : The mechanical properties of plasticized PVC processed in an extruder with a modified feed zone Type de document : texte imprimé Auteurs : Janusz W. Sikora, Auteur ; B. Samujlo, Auteur ; A. Stasiek, Auteur ; A. Tor-Swiatek, Auteur Année de publication : 2015 Article en page(s) : p. 359-365 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Extrudeuse monovis Matières plastiques -- Extrusion:Polymères -- Extrusion Matières plastiques -- Propriétés mécaniques Plastifiants Index. décimale : 668.9 Polymères Résumé : The work presents the results of experimental studies of selected mechanical properties of plasticized poly(vinyl chloride) extruded by a single-screw extruder with a modified feed section. The variable factors were: feed opening width, feed pocket depth in the extruder barrel and the rotational speed of the screw. The following parameters were studied: yield strength ReH (MPa), tensile strength Rm (MPa), percentage total extension at maximum force ?m (%), Shore hardness H (°ShA). It was found that the increase in the depth of the pocket and the decrease in the width of the feed opening in the studied range increase mechanical properties (besides percentage total extension at maximum force). It was determined that the increase of the screw speed and the simultaneous displacement of both the axis and edge of the feed opening in relation to the plasticizing system axis towards the direction of revolutions of the screw is favorable. DOI : 10.3139/217.3040 En ligne : https://drive.google.com/file/d/18wkwsFGgdV7X8lI-dXqTcJ2orsvgbLFO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24331 [article]

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