An annular rotating-die technique in extrusion process : effect of Mandrel rotating speed on extrudate swell behavior of HDPE parison / N.-T. Intawong in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 607-615 Titre : An annular rotating-die technique in extrusion process : effect of Mandrel rotating speed on extrudate swell behavior of HDPE parison Type de document : texte imprimé Auteurs : N.-T. Intawong, Auteur ; A. Darajang, Auteur ; S. Udomsom, Auteur ; T. Yoochoosai, Auteur ; C. Kantala, Auteur Année de publication : 2014 Article en page(s) : p. 607-615 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrudeuse monovis Extrudeuse rotative Matières plastiques -- Moulage par extrusion-soufflage Polyéthylène haute densité Index. décimale : 668.9 Polymères Résumé : This work aims to propose an annular rotating-die technique which is specifically designed and constructed in order for the mandrel to rotate in the stationary barrel during extrusion. The annular rotating-die was employed to study the effect of the mandrel rotating speeds on the extrudate swell behavior of HDPE parison in single screw extruder at a test temperature of 210°C. The results of experiment found that rotation of mandrel caused significant change in dimension of HDPE parison after it flowed out from the annular rotating-die. It was also found that at the same apparent shear rate, the diameter swell decreased with increasing mandrel rotating speed whereas the thickness swell yielded opposite results. These results could be explained by the change of flow direction during the flow of HDPE melt in the annular rotating-die. Furthermore, the annular rotating-die technique proposed in this research could be applied in adjusting size of diameter and thickness and in predicting thickness of HDPE parison during extrusion with no need to change any production parameter in the polymer extruder. Note de contenu : - EXPERIMENTAL : 1. Raw material - 2. Experimental apparatus and procedures - 3. Apparent shear rate calculation - 4. Measurements of the extrudate swell - RESULTS AND DISCUSSION : 1. Development of HDPE parison Dimension after exiting from the annular rotating-die - 2. swelling properties of HDPE parison in an annular rotating-die - 3. Application of annular rotating-die technique in extrusion process DOI : 10.3139/217.2930 En ligne : https://drive.google.com/file/d/1tLPjdpXncHHo2aDcykDzGVhJPQM2w01n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22227 [article]

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Converging-diverging flow in a novel extruder and its application in film blowing / X.-C. Yin in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 5 (11/2014) . - p. 552-557 Titre : Converging-diverging flow in a novel extruder and its application in film blowing Type de document : texte imprimé Auteurs : X.-C. Yin, Auteur ; B. Tang, Auteur ; Z. W. Yu, Auteur ; Z. T. Yang, Auteur ; G.-J. He, Auteur Année de publication : 2014 Article en page(s) : p. 552-557 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Déchirure (mécanique) Essais dynamiques Extrudeuse rotative Films plastiques -- Propriétés mécaniques Matières plastiques -- Moulage par extrusion-soufflage Mélange Microstructures -- Analyse Plastification Polyéthylène basse densité Traction (mécanique) Index. décimale : 668.9 Polymères Résumé : This article proposes a novel extruder based on converging-diverging flow for polymer processing. The extruder is composed of four vane plasticizing and conveying units (VPCU) and three mixing units. The working principle of the new extruder is described in detail. Film was produced on this machine by using of CaCO3 filled LDPE composites. The film's mechanical properties were studied in terms of tensile strength and tear strength. The microstructure of the composites was studied in terms of SEM. The thermo-mechanical history of the material suffered in this extruder can be remarkably shortened in contrast to a single screw extruder with the same maximum output. Experimental results showed that the die pressure has little effect on output. More CaCO3 can be filled into the blend without degrading the parts performance. Note de contenu : - EXPERIMENTAL : 1. Vane plasticizing and conveying unit - 2. Mixing unit - 3. Converging-Diverging flow type extruder - 4. Materials - 5. Preparation of CaCO3 filled LDPE film - 6. Specimen preparation - 7. Characterization and measurement - RESULTS AND DISCUSSION : 1. Extrusion characteristics of the extruder - 2. Mechanical properties - 3. Microstructure of the CaCO3/LDPE blends DOI : 10.3139/217.2856 En ligne : https://drive.google.com/file/d/1Ei3tldSGX80DfX1095ykJE21slH2zVFM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22220 [article]

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Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions / S. Yamada in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 4 (08/2015) . - p. 451-459 Titre : Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions Type de document : texte imprimé Auteurs : S. Yamada, Auteur ; K. Fukutani, Auteur ; K. Yamaguchi, Auteur ; H. Funahashi, Auteur ; K. Ebata, Auteur ; Hideyuki Uematsu, Auteur ; S. Tanoue, Auteur Année de publication : 2015 Article en page(s) : p. 451-459 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse numérique Calcul Distribution de temps de séjour Extrudeuse bi-vis Extrudeuse rotative Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : An intermeshing co-rotating twin-screw extruder is widely used for producing polymer composites. In order to satisfy properties of the composites, it is important to understand mixing performance of segments. In this study, we discussed mixing performance of special rotor segments commercially named VCMT (various clearance mixing technology) by using a numerical analysis method. The several tip clearances of VCMT work for achievement of both self-cleaning and effective mixing. We adopted a particle tracking method to obtain the following two evaluation indices; 1) residence time for the evaluation of its uniformity and 2) maximum 1st principal stress for the evaluation of dispersive mixing. And we evaluated mixing performance of VCMT by using probability distributions of each index. Moreover, we proposed weighted probability distributions as theoretically better evaluation. The probability distributions of VCMT were compared with those of two kinds of kneading disk segments (KDs). From the comparison, it was found that the probability of VCMT in large 1st principal stress region is higher than those of KDs. As a conclusion, VCMT has better mixing performance than KDs for the geometries and operating conditions that were investigated. Note de contenu : - ANALYSIS METHOD AND CONDITIONS : Fundamental equations and properties - Analysis conditions - Particle tracking method - Mixing evaluation indices - PREPARATION FOR NUMERICAL ANALYSIS-DETERMINATION OF COMPUTATIONAL MODEL - RESULTS AND DISCUSSION : Characteristics of residence time distribution - Dispersive mixing performance DOI : 10.3139/217.2972 En ligne : https://drive.google.com/file/d/1XgEHKyQAVgA3w-I0u05dph3hj0nadr47/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24854 [article]

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Extrusion : le point sur le cylindre thermique rotatif / Olivier Peiffer in CAOUTCHOUCS & PLASTIQUES, N° 801 (02/2002)

[article]  inCAOUTCHOUCS & PLASTIQUES > N° 801 (02/2002) . - p. 26-27 Titre : Extrusion : le point sur le cylindre thermique rotatif Type de document : texte imprimé Auteurs : Olivier Peiffer, Auteur Année de publication : 2002 Article en page(s) : p. 26-27 Langues : Français (fre) Catégories : Extrudeuse rotative Index. décimale : 668.4 Plastiques, vinyles Résumé : Spécialiste des rouleaux à circulation interne, l'entreprise Polimiroir a mis au point un échangeur thermique rotatif cylindrique largement utilisé dans les domaines de l'extrusion et de la co-extrusion. Note de contenu : - Le rouleau simple - Le rouleau à double enveloppe - Le rouleau à double enveloppe avec spiralage flux simple, pas constant ou dégressif - Le rouleau à double enveloppe avec spiralage à flux croisés Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23637 [article]

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From waste collector to the plastic recycler / Reinhard Bauer in KUNSTSTOFFE INTERNATIONAL, Vol. 109, N° 3 (03/2019)  

[article]  inKUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 3 (03/2019) . - p. 53-55 Titre : From waste collector to the plastic recycler : Technical answers to world political changes in film recycling Type de document : texte imprimé Auteurs : Reinhard Bauer, Auteur Année de publication : 2019 Article en page(s) : p. 53-55 Langues : Anglais (eng) Catégories : Emballages en matières plastiques Extrudeuse bi-vis Extrudeuse rotative Films plastiques Granulation Matières plastiques -- Extrusion Matières plastiques -- Recyclage Polyéthylène Index. décimale : 668.4 Plastiques, vinyles Résumé : Like plastics manufacturing and processing, the recycling of plastic products requires specialization to be efficient. Accordingly, a Dutch company has dedicated itself entirely to the recycling of agricultural and packaging films – and invested in a machine technology, which was found along tortuous ways. Note de contenu : - The export of plastic waste to china came on a halt - Problems drive you smart - Specialization as a success factor - Expansion of production capacity - Fig. 1 : At the heart of the MAS extrusion technology is the conical twin-screw extruder with co-rotating screws developed by its founder Helmuth Schulz. Advantages of this type of extruder are the large feed opening, which allows the efficient intake of raw materials with low bulk density, as well as the low-pressure plasticization - both prerequisites for gentle recycling. - Fig. 2 : From bale to granulate: in the sorting process, foreign material is first removed from the dissolved film bales, then the films are separated according to color class or material quality. This is used to produce unmixed bales. Cutting mills process them into flakes, wich are then fed batch-wise to the DRD dry cleaners to remove granular soiling and moisture. The cleaned and dried foil flakes pass through buffer storage to the cascade extruders. Stations vivible in the picture are the single-screw extruder, the fine filter and the granulation. - Fig. 3 : Reuse in blown film production: Caroda Polymer Recovery processes around 35,000t of agricultural films and pallet shrink films per year into gray, black and tea-colored polyethylene re-granulates. En ligne : https://drive.google.com/file/d/1kH8qLpw6ITk9nj_RiXEfZFiRm7vqUrZQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32154 [article]

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Processing and characterization of polyphenylene ether/polystyrene/nylon-6 ternary blends / P. Hadimani in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 2 (05/2020)  

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Rheological modeling and dynamic characteristics of disc extruders / A. A. Borisov in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 4 (09/2011)  

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