| Titre : |
Transparency in compounding : Inline testing methods for monitoring processes |
| Type de document : |
texte imprimé |
| Auteurs : |
Pierre Pfeffer, Auteur ; Norbert Halmen, Auteur ; Thomas Hochrein, Auteur ; Giovanni Schober, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 10-13 |
| Langues : |
Anglais (eng) |
| Catégories : |
Analyse spectrale
Assurance qualité
Contrôle non destructif
Matières plastiques
Mesures optiques
Micro-ondes
Procédés de fabrication
Térahertz
Ultrasons
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
The quality of final products can be increased by using measurement technology for monitoring production processes. Interest in it is increasing especially for compounding. There are various existing methods of non-destructive testing that can also be used inline in the manufacturing process. The different methods are suitable for different applications: an overview of the current capabilities and limitations of the various inline methods. |
| Note de contenu : |
- Ultrasonics : Proven, but temperature-dependent technology
- Optical spectroscopy : Regulating color directly in production
- Microwave and terahertz : Temperature-independent and non-contacting
- The appropriate method for the particular application
- Fig. 1 : An overview of electromagnetic and mechanical waves arranged in the order of frequency and wave length : The red colored areas represent the NDT methods used in plastics processing
- Fig. 2 : Dependence of measurable ultrasonic amplitude (extinction coefficients) of filler content and the accompanying median size of chalk particles in plastics compounds: By using such databank-integrated calibration curves, both of these quality relevant features can be quantified inline by ultrasound
- Fig. 3 : Process chain exemplified by color measurement of dyed plastics products: Dyed compounds are manufactured from various raw materials and processed further, either continuously by extrusion, or discontinuously to injection molded products. All along the process chain there are various possibilities for monitoring color quality
- Fig. 4 : Dependence of a characteristic value, the so-called refractive index determined via terahertz from the degree of melting in a compound or the melt temperature: The degree of melting can be recorded inline by consulting a databank specific to the material
- Fig. 5 : The dependence of so-called intensity, a characteristic value recorded via terahertz from the stochastic appearance of foreign materials in a compound (left), as well as a microscopic image of a machine-related wear particle in the melt (right): A threshold value (red line, left) can be defined by taking a variety of processing states into consideration beyond which the measuring signal can be univocally consigned to a foreign particle |
| En ligne : |
https://drive.google.com/file/d/14HvEX29bLDS3vrJDpT7bgV9MOWqmqJhZ/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35712 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 4 (2021) . - p. 10-13
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Transparency in compounding in KUNSTSTOFFE INTERNATIONAL, Vol. 111, N° 4 (2021)
