| Titre : |
Freedom from internal defects for brilliant images : New "optimelt sequence" software reduces microdefects in optical components |
| Type de document : |
texte imprimé |
| Année de publication : |
2022 |
| Langues : |
Anglais (eng) |
| Catégories : |
Détection de défauts (Ingénierie)
Logiciels
Matériel optique
Matières plastiques -- Moulage par injection
Tomographie
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Injection molding of optical components is subject to strict requirements, including freedom from internal defects. Tomography analysis methods can identify even microdefects in the order of 20 µm. The main cause of these very small defects are gases that enter the melt either from the material or the environment. With new software, Engel intends to reduce gas inclusions during the processing of transparent plastics and ensures a consistent high melt quality. |
| Note de contenu : |
- Making the smallest defects visible
- Customizable plasticizing is the key
- Variability in the melt compression
- Number of microvoids significantly lower
- Outlook : light guides and mechanically stressed parts
- Fig. 1 : Optical coherence tomography (OCT) provides two- and three-dimensional images from light-scattering samples with micrometer resolution
- Fig. 2 : Volume rendering of an OCT measurement (left) – width of the measurement range: 3 mm – allows the lens cross-section to be identified. XY layers are derived from this. The image right illustrates the microvoids after speckle removal
- Fig. 3 : Flow diagram: besides the backpressure generation by means of an axial advance of the screw (backpressure via screw position, left), pressure can also be generated by screw rotation
- Fig. 4 : The numbers indicate the number of microvoids detected per lens in each case. The diagram makes clear that this number can be significantly reduced with optimelt sequence and the additional pressure application
- Fig. 5 : With the use of optimelt sequence, the plastic lenses have significantly fewer microdefects (right). The lens in the OCT cross-section left was produced by standard injection molding |
| En ligne : |
https://drive.google.com/file/d/1bBf1hWzSZLO4UeG-MRd8VtOCIhvbdczB/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37965 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 112, N° 4 (2022)
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Freedom from internal defects for brilliant images in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 4 (2022)
