| Titre : |
Contactless testing of packaging : Comparison of terahertz- and microwave-testing |
| Type de document : |
texte imprimé |
| Auteurs : |
Pierre Pfeffer, Auteur ; Thomas Hochrein, Auteur ; Giovanni Schober, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 46-49 |
| Langues : |
Anglais (eng) |
| Catégories : |
Emballages en matières plastiques
Mesures dimensionnelles sans contact
Micro-ondes
Térahertz
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Terahertz and microwave methods offer a wide range of applications for testing of plastic packaging. Already established wall thickness measurements and defect detection are now joined by a wealth of other possible applications that promise process reliability and cost efficiency. Both systems show different strengths and are suitable for different applications. |
| Note de contenu : |
- Differences between THé and MW
- Saving costs and resources by inline testing
- THz-systems advantageous with foams
- Reliable recognition of defects in packaging
- Moisture and filler content : further applications for the testin methods
- Fig. 1 : The frequency range of terahertz and microwave technology lies between that of radio wave-based systems and that of infrared and UV light-based systems
- Fig. 2 : Principle of thickness measurement: interfaces of different density lead to reflection of terahertz and microwaves. By measuring the temporal behavior and knowing the material-specific propagation speed, the distance traveled and thus the thickness can be inferred
- Fig. 3 : Relationship between the refractive index, which can be determined in real time and inline, and the bulk density for various expanded polymers : since the frequency bandwidth is wider for THz systems than for MW systems, the former are more suitable for testing foams
- Fig. 4 : THz and MW measurement techniques can be used to determine the moisture content of polymers. MW systems are particularly suitable for this purpose
- Fig. 5 : Measuring the frequency-dependent absorbance allows conclusions to be drawn about particle sizes. A wide frequency bandwidth is an important criterion for this purpose
- Fig. 6 : THz and MW methods can also be used for the identification of materials |
| En ligne : |
https://drive.google.com/file/d/1Ps2ZPuXjEl3L6ADmWJx5uHS2fjowfmIZ/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35499 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 2 (2021) . - p. 46-49
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Contactless testing of packaging in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 2 (2021)
