| Titre : |
Short cycle times and high productivity for smart components : Direct coating with polyurethane coatings creates opportunities in design and functionality |
| Type de document : |
texte imprimé |
| Auteurs : |
Christoph Bontenackels, Auteur ; Ulrich Fehrenbacher, Auteur ; Ingo Kleba, Auteur ; Markus Mechtel, Auteur ; Olaf Zöllner, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 50-53 |
| Langues : |
Anglais (eng) |
| Catégories : |
Adhésion
Matières plastiques dans les automobiles
Polycarbonates
Polymères -- Surfaces
Polyuréthanes
Revêtement autoréparant
Temps de cycle (production)
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Classic coating techniques such as spray painting are reaching their limits in the production of functionally highly integrated and elegantly decorated plastic parts. In contrast, the process chain of the direct coating process has now been optimized. Self-healing, fast-curing PU casting coatings and polycarbonate compounds that adhere firmly to each other even after aging are now available for this manufacturing process. |
| Note de contenu : |
- Great freedom of design for surfaces
- Specially adapted materials for the DC process
- Self-healing surfaces
- High transparency allows for the integration of light and sensors
- Ensuring the adhesive strength between PU and PC
- Tools for filling simulation
- Automotive industry appreciates the DC process
- Fig. 1 : White light interferograms of a scratch mark: after 48 hours, the scratch is no longer visible due to the self-healing effect
- Fig. 2 : Transparency in combination: comparative transmission measurements show that Makrolon and Puroclear ideally complement each other with their respective high transparency
- Fig. 3 : Results obtained in the POSI adhesion test for the combination of a standard PC and PU coating (1) and for the combination of a Makrolon Class A product type with a puroclear standard coating (2) and with a puroclear coating system optimized for PC (3) (hydrolytic storage for 72 h at 90 °C and 95 % humidity)
- Fig. 4 : The demonstrator for the control panel of a center console with inductive button functions was produced in the DC process using back injection molding of a printed Makrofol PC film, and the surface was finished with a puroclear-based deep gloss
- Fig. 5 : Simulation of DC mold filling using the example of a sample board (red = PU coating, blue = air): if surface structures are integrated into the PU coating, air pockets can form in the coating as a result of the coating being advanced in thicker areas. If, on the other hand, the surface structures are in the PC substrate, no air pockets are formed in the PU coating due to the uniform wall thickness and flow front
- Fig. 6 : Simulation of warpage using the example of a sample panel: if the surface structures are in the PU coating, increased warpage can occur due to the greater shrinkage potential in the thicker PU coating areas. However, warpage is largely avoidable if the surface structures are incorporated into the PC substrate and thus the PU wall thickness is homogeneous and low |
| En ligne : |
https://drive.google.com/file/d/1lagCAoxRfEOSdVVCskygBSlIwgyHFyTo/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36288 |
in KUNSTSTOFFE INTERNATIONAL > Vol. 111, N° 7 (2021) . - p. 50-53
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