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Balanced mixing screw for single-screw extruder / Christian Marschik in KUNSTSTOFFE INTERNATIONAL, Vol. 108, N° 6 (06-07/2018)
[article]
Titre : Balanced mixing screw for single-screw extruder : Design of mixing elements for demanding extrusion processes Type de document : texte imprimé Auteurs : Christian Marschik, Auteur ; Otto Skrabala, Auteur ; Jürgen Miethlinger Année de publication : 2018 Article en page(s) : p. 46-49 Langues : Anglais (eng) Catégories : Malaxeurs et mélangeurs
Matières plastiques -- Extrusion -- Appareils et matériels
Vis d'extrusion simpleIndex. décimale : 668.4 Plastiques, vinyles Résumé : The homogenization of the melt – for example when coloring plastic – is a fundamental prerequisite for good end product quality in extrusion. Homogeneity is determined to a large extent by the mixing section. However, a supposedly intensive mixer is not always the best choice. Note de contenu : - Variety of geometries
- Result 1 - Velocity field
- Result 2 - Pressure consumption
- Result 3 - Dissipation
- Result 4 - Distributive mixing
- Result 5 - Stretching
- Conclusion : Basis for new geometries
- Table : lnvestigated single-screw mixer geometries : the number of flights and blocks was varied; the identical single screw no. 3 and 5 serves as the reference geometry
- Fig. 1 : Investigated block-head mixers : the nominal dia-meter of the block-head mixers is 60 mm. Reference geometries 3 and 5 are identical
- Fig. 2 : Velocity field of high-molecular HDPE pipe grades : a) in the axial direction, b) in the cross-section of one block, and c) in the cross-section in between two blocks
- Fig. 3 : Pressure loss: influence of the number of flights per block (a) and blocks (b)
- Fig. 4 : Dissipation: influence of the number of flights per block (a) and blocks (b)
- Fig. 5 : Particle distribution for geometry 1: a) at the start and b) at the end of the block-head mixer
- Fig. 6 : Particle distribution at the end of the block-head mixer: a) for geometry 1 and b) geometry 8
- Fig. 7 : Particle surface stretching at the end of the block-head mixers: influence of the number of flights per block and blocksEn ligne : https://drive.google.com/file/d/1iyPeNsI01amr1CobMm3433IKSohAmXst/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31030
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 6 (06-07/2018) . - p. 46-49[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20081 - Périodique Bibliothèque principale Documentaires Disponible Characterisation of finite length composites / W. Gleissle in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 1 (03/2003)
[article]
Titre : Characterisation of finite length composites : Rheological Studies of Processed PP-Glass Composites Type de document : texte imprimé Auteurs : W. Gleissle, Auteur ; J. Curry, Auteur Année de publication : 2003 Article en page(s) : p. 20-32 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
Composites à fibres de verre
Compoundage
Extrudeuse bi-vis
Polypropylène
Rhéologie
Vis d'extrusion simpleIndex. décimale : 668.9 Polymères Résumé : This paper is a technical report about the structure and the rheological behaviour of processed polypropylene-glass fibre composites. The present studies has been carried out as a part of the international project on the Characterization of Finite Length Composites initiated and organized by the IUPAC Working Party : Structure and Properties of Commercial Polymers. Seven industrial and university laboratories in Europe and in USA worked together in a common project to investigate the influence of the processing conditions on the rheology and manufacturing behaviour of polymer-glass composites preprocessed in a twin screw extruder. All investigations presented concern the influence of the processing procedure on the structure of the composites such as fiber length destribution, fiber orientation, distribution of the fibre concentration in the sample and the rheology of the composites. The flow behaviour dependent on the processing conditions has been measured using capillary rheometers to investigate the viscosity functions, the entrance and outlet pressures losses as well as for observations of the shape and internal structure of extruded composites. Torsional rheometers for low shear rate, oscillatory and transient viscosity behaviour and for the quantification of fibre orientation with ongoing shear process. Additionaly queeze flow experiments are made.
Most laboratories used analogous recording sytems to documente the primary experimental results. So results are partially given here as direct copies from the original data readings. The different data handling and the transfer of data from laboratory to laboratory for comparison of results leads sometimes to unavoidable inhomogeneous (due to the style and possibilities of the different laboratories) presentation of the results. The present report is a result of data collecting, data comparison and documentation of results over a period of nearly ten years.Note de contenu : - PROCESSING PROCEDURE
- MATERIAL CHARACTERIZATION-FIBRE LENGHT REDUCTION : Average fibre length and fibre length distribution
- FLOW BEHAVIOUR - Capillary flow-slit-and round bore capillaries - Torsional flow : Parallel plate and cone and plate rheometer
- OPTICAL OBSERVATIONS - Fibre orientation in capillary flow-die entry observations - Fibre orientation in torsional flow - Shape of the extrudatesDOI : 10.3139/217.1721 En ligne : https://drive.google.com/file/d/1Uuc19PnmbaWy8lSHX7FmYq9rEJ5HnGTK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15847
in INTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 1 (03/2003) . - p. 20-32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001023 - Périodique Bibliothèque principale Documentaires Disponible Dynamic temperature measurement / Volker Schöppner in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 9 (09/2010)
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Titre : Dynamic temperature measurement Type de document : texte imprimé Auteurs : Volker Schöppner, Auteur Année de publication : 2010 Article en page(s) : p. 117-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement visqueux
Etat fondu (matériaux)
Matières plastiques
Mesure
Rhéologie
Thermométrie
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.
Vis d'extrusion simpleIndex. décimale : 668.4 Plastiques, vinyles Résumé : Metrology - Infrared thermometers with response times in the order of 10 milliseconds are used to measure the temperature profile at right angles to the screw channel. These allow, for example, the solid bed in the homogenizing section to be localized, or the increase in temperature of the melt to be determined as the melt flows over the screw flights when the screw is stationary. Note de contenu : - Prediction of the melting profile
- Infrared thermometer
- Material parameters
- Machine parameters and boundary conditions
- From solid bed to melt poolPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10120
in KUNSTSTOFFE INTERNATIONAL > Vol. 100, N° 9 (09/2010) . - p. 117-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012486 - Périodique Bibliothèque principale Documentaires Disponible Lower temperature plasticizing and extrusion of polymer in spherical screw extruder under vibration force field / G. Zheng in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 1 (03/2011)
[article]
Titre : Lower temperature plasticizing and extrusion of polymer in spherical screw extruder under vibration force field Type de document : texte imprimé Auteurs : G. Zheng, Auteur ; C. Xu, Auteur ; Y. Liu, Auteur ; J. Qu, Auteur ; T. Jiang, Auteur Année de publication : 2011 Article en page(s) : p. 40-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Énergie -- Consommation
Matières plastiques -- Extrusion
Matières plastiques -- Moulage
Ondes électromagnétiques
Plastification
Polyéthylène haute densité
Vis d'extrusion simpleIndex. décimale : 668.9 Polymères Résumé : Physical and mathematical model for polymer plasticizing in proposed electromagnetic dynamic spherical screw extruder were developed to explore polymer plasticizing and molding mechanism at lower temperature under vibration force field. Polymer plasticizing mechanism was studied by deriving the mathematical expressions of energy consumed and the polymer flow. The energy consumed in polymer plasticizing was depicted in terms of vibrating dissipation, polymer deformation, shear and friction energy. LDPE was used as an objective material and extruded by the extruder with the electromagnetic excitation and spherical screw. The experimental results show the good agreement with theoretical calculations. Both of them show that: Polymer processing temperature and energy consumption decrease significantly while the plasticizing rate is increased over 60% by introducing the vibration force field. The research offers experimental and theoretical references as well as the evaluation method for optimizing the polymer processing parameters and designing the vibration induced equipment. DOI : 10.3139/217.2372 En ligne : https://drive.google.com/file/d/1VYVOi19pybPDfjlHp7Qw6UPbCB6QCwtE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10981
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 1 (03/2011) . - p. 40-47[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012871 - Périodique Bibliothèque principale Documentaires Disponible Mixing results in the single-screw extruder / Stefan Epple in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 4 (04/2012)
[article]
Titre : Mixing results in the single-screw extruder Type de document : texte imprimé Auteurs : Stefan Epple, Auteur ; Eberhardt Grünschloß, Auteur ; Christian Bonten, Auteur Année de publication : 2012 Article en page(s) : p. 33-36 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion -- Appareils et matériels
Mélange
Vis d'extrusion simpleIndex. décimale : 668.4 Plastiques, vinyles Résumé : Quality Assurance - A uniform temperature and a very good distribution of additives during the production of plastic melts are fundamental demands made on an extruder system. In present-day high-performance single-screw extruders, mixing elements with complex mixer geometries are necessary in order to be able to meet these demands. Note de contenu : - Different mixing elements
- Test procedure
- Pressure drop
- Melt temperature
- Homogeinity
- Overall evaluationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15129
in KUNSTSTOFFE INTERNATIONAL > Vol. 102, N° 4 (04/2012) . - p. 33-36[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13841 - Périodique Bibliothèque principale Documentaires Disponible Modeling of agglomerate dispersion in single screw extruders / N. Domingues in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
PermalinkTechnical products and sustainable production / Oliver Te Heesen in KUNSTSTOFFE INTERNATIONAL, Vol. 103, N° 6 (06/2013)
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