[article]
| Titre : |
Opening up a broader range of applications for recyclate : The iQ weight control assistance system ensures higher process stability |
| Type de document : |
texte imprimé |
| Auteurs : |
Georg Pillwein, Auteur ; Philipp Willnauer, Auteur ; Georg Steinbichler, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
p. 26-30 |
| Langues : |
Anglais (eng) |
| Catégories : |
Économie circulaire L'économie circulaire est une expression générique désignant un concept économique qui s'inscrit dans le cadre du développement durable et s'inspirant notamment des notions d'économie verte, d’économie de l'usage ou de l'économie de la fonctionnalité, de l'économie de la performance et de l'écologie industrielle (laquelle veut que le déchet d'une industrie soit recyclé en matière première d'une autre industrie ou de la même).
Son objectif est de produire des biens et services tout en limitant fortement la consommation et le gaspillage des matières premières, et des sources d'énergies non renouvelables ;
Selon la fondation Ellen Mac Arthur (créée pour promouvoir l'économie circulaire1), il s'agit d'une économie industrielle qui est, à dessein ou par intention, réparatrice et dans laquelle les flux de matières sont de deux types bien séparés ; les nutriments biologiques, destinés à ré-entrer dans la biosphère en toute sécurité, et des intrants techniques ("technical nutrients"), conçus pour être recyclés en restant à haut niveau de qualité, sans entrer dans la biosphère
Matières plastiques -- Moulage par injection
Matières plastiques -- Recyclage
Poids -- Contrôle
Polypropylène
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Smart assistance systems are paving the way for self-optimizing production. Automatic correction of quality-relevant parameters is already reality for individual phases of the injection molding process. At K 2019, Engel presented the iQ weight control with the example of a recyclate application for the first time. Extensive tests performed jointly between the injection-molding machine manufacturer and the recycling specialist Erema confirm that the system has great potential for the circular economy. |
| Note de contenu : |
- Differently processed recycled pellets under test
- Recognizing and compensating differences in material properties
- More useful than the MFI
- Moldings with complex geometries as test objects
- Reliably assessing the potential before investment
- Fig. 1 : The image sections of the flow-path end (top) clearly show that, with iQ weight control deactivated (black), the cavity was not completely filled after batch change. With iQ weight control activated (green), on the other hand, acceptable parts were consistently produced
- Fig. 2 : Different reprocessing methods influence the flowability and other properties of the resulting pellets. To simulate a broad spectrum of different conditions, the series of experiments was conducted with four differently treated PP recyclates
- Fig. 3 : The two diagrams show shear-rate-dependent viscosity curves measured in the high-pressure capillary rheometer (HCR) for different recyclates in double-logarithmic presentation. MFI measurements are made in the range of low shear rates, which significantly higher shear rates occur during the actual injection molding process. The viscosity change determined from process data is therefore often much more relevant than a pure MFI
- Fig. 4 : Stepped panel with four different wall thicknesses.The center web is 3 mm thick. The side arms have wall thicknesses of 2, 1 and 0.5 mm, with the thinnest regions located at the end of the flow path
- Fig. 5 : On recyclate change, the shot weight sinks significantly with the consequence that defec¬tive parts are produced.With the activation of iQ weight control, the shot weights are increased to the range of the reference material
- Fig. 6 : Pressure curves alter batch change from recyclate 1 to recyclate 2.The upper diagram presents the specific injection pressure profile. The plot of the cavity pressure curves (bot-tom) supports the result of the part weight measurement and also shows the more uniform fill front progress with iQ weight control |
| En ligne : |
https://drive.google.com/file/d/1bi3IdggWY9Mnm2TrSrpZPBcOP6DsEg6v/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34267 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 110, N° 4 (2020) . - p. 26-30
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Opening up a broader range of applications for recyclate in KUNSTSTOFFE INTERNATIONAL, Vol. 110, N° 4 (2020)
