Titre : |
Keeping track of elongation : Online rheometers simplify the continuous evaluation of melt quality |
Type de document : |
texte imprimé |
Auteurs : |
Sven Wolf, Auteur ; Hans-Jürgen Luger, Auteur ; Jürgen Miethlinger, Auteur |
Année de publication : |
2018 |
Article en page(s) : |
p. 36-40 |
Langues : |
Anglais (eng) |
Catégories : |
Composites à fibres Matières plastiques -- Extrusion Polyéthylène basse densité Polypropylène Rhéologie Rhéomètres Viscosité
|
Index. décimale : |
668.4 Plastiques, vinyles |
Résumé : |
In order to ensure efficient and cost-effective control of extrusion, the decisive parameters for melt quality must be determined during the process. Previously, only single points of the viscosity curve could be determined online. Now, with the help of special slit die geometry, a novel extrusion rheometer is able to measure shear and elongational viscosity – also inline. |
Note de contenu : |
- Patented hyperbolic elongation slit die
- Comparison with offline measurements
- Polymer preparation
- Polymer blend development
- Higher "resolution" with fiber compounds
- Application possibilities for the extrusion rheometer
- Conclusion another step towards industry 4.0
- Fig. Shear and elongation rheometer for online measurement : In the basic version, measurements are made with an (adjustable) fixed pump speed. The research versio can record complete elongational and shear viscosity curves automatically
- Fig. 1. Semi-hyperbolic slit die. Basic plan and side views of the pattented slit, and a detail of the height and width curves in the first and second transition zones
- Fig. 2. Basic measurement setup (without melt pump) in the extrusion rheometer. Melt flow for the inline measurement (with return)
- Fig. 3. Elongational and shear viscosity of LDPE-1840 H and PP-RA 130E as determined with online and offline measurement methods
- Fig. 4. Changes in the elongational and shear viscosity curves due to molecular degradation of PP-RA 130E after multiple processing
- Fig. 5. Shear and elongational viscosity curves of different polypropylene blends during the development of plastic recipes
- Fig. 6. Online measurement of polypropylene compounds with different amounts of glass fibers and natural fibers : Shear viscosity and elongational viscosity
- Fig. 7. Film production line with twin-screw and integral viscosity sensor : Example of an integrated plant layout that already exists |
En ligne : |
https://drive.google.com/file/d/1Dj5sFYBrA_hl3unbqVN4p4pr9t3u8iql/view?usp=drive [...] |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30092 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 108, N° 1-2 (01-02/2018) . - p. 36-40