Design of dispersive mixing devices / C. Rauwendaal in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 1 (03/1999)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XIV, N° 1 (03/1999) . - p. 28-34 Titre : Design of dispersive mixing devices Type de document : texte imprimé Auteurs : C. Rauwendaal, Auteur ; T. Osswald, Auteur ; P. Gramann, Auteur ; B. Davis, Auteur Année de publication : 1999 Article en page(s) : p. 28-34 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Mixing is one of the main functions of screw extruders. In the analysis of mixing, there are two mixing mechanisms that need to be considered: distributive and dispersive mixing. It is well known that Single screw extruders generally have poor dispersive mixing capability, even when dispersive mixing elements are incorporated into the screw design. This paper will discuss the requirements for dispersive mixing, current dispersive mixing elements used in single screw extruders will be analyzed, and the lack of efficient dispersive mixing will be explained. A new generation of dispersive mixing elements will be introduced for use in both single and twin screw extruders and infernal mixers. A two and three dimensional flow simulation will be used to analyze the mixing performance of these new mixers. Experimental work on the new mixing elements will be presented in a follow-up paper; the results demonstrate that it is possible to achieve dispersive mixing on single screw extruders that is as good as what can be achieved on twin screw extruders. The implications of these results on the compounding industry will be briefly discussed. Note de contenu : - Limitations of current dispersive mixers - New dispersive mixers for single screw extruders - Determining the proper clearance value respect to flow rate - Determining the proper flight flank geometry - Slot geometry - Computer simulation DOI : 10.3139/217.1524 En ligne : https://drive.google.com/file/d/1wk5uLCbGd0SccjGuBkaPwYspdK8YXChy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16108 [article]

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The adjustable grooved feed extruder / C. Rauwendaal in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 133-136 Titre : The adjustable grooved feed extruder Type de document : texte imprimé Auteurs : C. Rauwendaal, Auteur ; J. Sikora, Auteur Année de publication : 2000 Article en page(s) : p. 133-136 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Grooved feed extruders have been around since about the 1960s. These extruders offer considerable advantages over conventional extruders, such as higher throughput, better stability, and the ability to process very high molecular weight polymers. There are some important disadvantages as well, for instance, higher motor load, wear is more likely, high pressures in the grooved region, and the screw design has to be adapted. The disadvantages of the grooved feed extruder disappear when the grooved feed extruder is made with a mechanism that allows adjustment of the groove depth. This paper will report on the development of grooved feed extruders that incorporate an adjustment mechanism that allows the depth of the grooves to be changed, during actual operation, from zero to full depth. Operational data from actual extrusion experiments are presented. Note de contenu : - Problems with grooved feed extruders - Removing the drawbacks of grooved feed extruders - The adjustable grooved feed extruder - Advantages of adjustable groove depth DOI : 10.3139/217.1593 En ligne : https://drive.google.com/file/d/170xL1MBWrNz7G4KzOvklBJJv_IZMzWsA/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16051 [article]

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