| Titre : |
Production of fine polymer powders for additive manufacturing |
| Type de document : |
texte imprimé |
| Auteurs : |
Ergün Altin, Auteur ; Steffen Sander, Auteur |
| Année de publication : |
2019 |
| Article en page(s) : |
p. 26-27 |
| Langues : |
Anglais (eng) |
| Catégories : |
Broyage cryogénique
Broyeurs
Impression tridimensionnelle
Polyamide 6
Polymères
Poudres
Production
|
| Index. décimale : |
668.9 Polymères |
| Résumé : |
Many industrial sectors are focusing increasingly on the additive manufacturing of components made of metal or polymers. Selective Laser Sintering (SLS) constitutes an important process for the 3D printing of polymers. Fine polymer powders are sintered, thereby, in a powder bed by means of laser to form three-dimensional objects. This printing process, however, calls for polymer powders with a particle size of around d90. 100pm. Among other methods, cryogenic comminution is applied for the production of such fine powders. In this case, polymer granules are embrittled by means of liquid nitrogen (LN2) and then ground in a pin mill. The specific consumption of liquid nitrogen is a major cost factor. Hosokawa Alpine AG offers solutions to reduce the specific consumption. Assuming an efficient classifier and mill in circuit, the product specifications can also be guaranteed and the operating costs mininnised. |
| Note de contenu : |
- Contraplex wide-chamber mill CW 250 II : the right choice for cryogenic size reduction
- Optimised screw geometry guarantees efficient dosing of feed material
- Adaptation to the pin discs
- Intelligent system concept reduces operating costs
- Fig. 1 : Contraplex wide-chamber Mill CW 250II
- Fig. 2 : I&C flow chart of cryogenic grinding with the CW 250 II
- Fig. 3 : DEM simulation of product discharge from a screw cooler
- Fig. 4 : Influence of the number of pins of the fines portion and fines throughput
- Fig. 5 : Optimum operating costs in grinding-classifying circuit exemplified by PA-6
- Fig. 6 : Different grindability of TPU and PA-6 for different feed rates |
| En ligne : |
https://drive.google.com/file/d/1xkJLsyPX9xFSsEL35OaRVHvp21Ldh64v/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32606 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4651 (05/2019) . - p. 26-27
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Production of fine polymer powders for additive manufacturing in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4651 (05/2019)
