| Titre : |
The hot runner valve pin as actuating variable : Cavity-specific pressure control to increase process consistency |
| Type de document : |
texte imprimé |
| Auteurs : |
Christian Hopmann, Auteur ; Hanna Dornebusch, Auteur ; Matthias Schöll, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 22-25 |
| Langues : |
Anglais (eng) |
| Catégories : |
Canaux chauffants
Contrôle technique
Matières plastiques -- Moulage par injection
Pression -- Contrôle
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The institute for plastics processing (IKV) at RWTH Aachen University is investigating a new control approach for injection molding in whch the cavity pressure is controlled by different positions of the hot runner valve pin. The influence on the cavity pressure of different strokes in the holding pressure phase is investigated. |
| Note de contenu : |
- Control of cavity pressure directly at the gate
- The pressure level in the cavity decreases with smaller opening strokes
- Closing the pin : small pressure increase with each positioning step
- Opening the pin : slight pressure decrease with each travel step
- Figure : The experimental mold with the cavity of a bicycle saddle has a servo-electrically driven hot runner
- Fig. 1 : Two combined p/T sensors for internal pressure measurement are installed in the mold along the flow path
- Fig. 2 : Different opening strokes in the holding pressure phase influence the cavity pressure
- Fig. 3 : The narrowest cross-section in the hot runner is only affected in the last quarter before the pin closes completely
- Fig. 4 : Gradual closing of the hot runner only slightly influences the pressure curve
- Fig. 5 : When the hot runner is gradually opened during the holding pressure phase, a sink mark can be seen in the cavity pressure curve
- Table 1 : Plant ans system components as used in the experiments for cavity-specific pressure control |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35100 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 1 (2021) . - p. 22-25
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