| Titre : |
Software-based control of IR ovens : Efficient and precise heating up to thermoplastic composites |
| Type de document : |
texte imprimé |
| Auteurs : |
Junsheng Luo, Auteur ; Norbert Müller, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 17-21 |
| Langues : |
Anglais (eng) |
| Catégories : |
Chauffage
Composites thermoplastiques -- Moulage par injection
Plaques (ingénierie)
Rayonnement infrarouge
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Infrared heating technology has become established as the standard in the processing of thermoplastic composite materials. It makes it possible to heat flat organo sheets of up to about 3 mm thickness within the cycle times characteristic for injection molding processing. The focus is on process control. On the one hand, it is important that the heating process is fast, on the other hand, the material must not be overheated. It is also important to achieve excellent temperature homogeneity. Simultaneous processing of blanks with different thicknesses is particular challenge. |
| Note de contenu : |
- IR oven supports fast not handling
- Efficient heating of thick semi-finished products
- Highest temperature homogeneity with optimum material protection
- Controlling a large variety of operating states
- Reaching targets simultaneously with all control zones
- Heating up semi-finished products of different thicknesses together
- Figure : Three organo sheets of different thickness are heated in two IR ovens in the production of a door structural part
- Fig. 1 : The surface temperature is monitored using pyrometers during the entire heating process. A double-sided IR oven is equipped with six pyrometer as standard equipment. The picture shows an example of the temperature curve at one measuring position during the heating phase and the soaking phase
- Fig. 2 : A double-sided horizontal IR oven with 100 x 600 mm payload area : the radiators are combined into groups to allow for control on the basics of a specific temperature measurement
- Fig. 3 : In the experiment, thermal inhomogeneties were specifically induced (initiatial situation). The resulting heating curves were then optimized by automatic process control (CZ = control zone)
- Fig. 4 : Automatic optimization of the heating behavior leads to a more uniform, almost linear temperature rise
- Fig. 5 : Software-supported optimization of the control parameters ensures high control quality in the heating phase
- Fig. 6 : Thanks to automatic process optimization, the two organo sheets reach the temperature setpoint at the same time despite of their different thicknesses |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35099 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 1 (2021) . - p. 17-21
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