| Titre : |
Quickly and gently around the bend : Darmstadt University of Applied Sciences and MHT optimize the hot runner for PET preform production |
| Type de document : |
texte imprimé |
| Auteurs : |
Thomas Schröder, Auteur ; Christian Tilsner, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 36-39 |
| Langues : |
Anglais (eng) |
| Catégories : |
Canaux chauffants
Empreinte (moule d'injection)
Matières plastiques -- Moulage par injection
Polyéthylène téréphtalate
PréformesObjet constituant la majeur partie d’une pièce à fabriquer et qui nécessite un travail supplémentaire pour devenir une pièce finie. Ce terme s’utilise notamment pour le moulage, l’usinage, la taille d’outils en silex, la fabrication de fibre optique…
Rhéologie
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Consider this paradox : sensitive PET is particularly demanding when being processed because it undergoes rapid thermal and mechanical degradation, yet when PET preforms are being produced scant attention is paid to designing the all-important hot runner to suit the individual product. Much more often, a manufacturer will use several cold halves and a hot one and produce articles weighing from 6 to 40 g. Darmstadt University of Applied Sciences, Germany, and mold specialist MHT conducted a research project aimed at determining how the hot runner design affects preform quality. |
| Note de contenu : |
- 4-cavity mold simulates 96 cavities
- Dust formation varies with PET grade
- Hot runner for rapid, gentle material transport
- Market launch at K2019
- Fig. 1 : Hot runner of the test mold with three platens to simulate the length of the melt runners in a 96-cavity mold
- Fig. 2 : The simulation shows the heat flow in a 96-fold hot runner system
- Fig. 3 : Experimental setups with a melt runner of 4 mm diameter for the rheological simulation
- Fig. 4 : The larger the diameter of the pipe, the lower are the pressure losses due to cross-sectional discontinuities
- Fig. 5 : Degradation as a function of residence time for different PET grades at the same shear rate. Darmstadt University of Applied Sciences and MHT can already simulate dust formation in advance of PET preform projects in order to counteract it with design measures |
| En ligne : |
https://drive.google.com/file/d/18_yMVbXcVMvbdXJXbeZjeDksDuOh3Htb/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32553 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 109, N° 5 (05/2019) . - p. 36-39
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