Méthodes de production et de traitement de la poudre d'aluminium / poudre d'aluminium en flocons
Aluminum powder production and processing methods / flake Aluminum powder
1. Melt extrusion method:
In this method, the metal pigment and the remaining components of the powder coating (resin or the like) are heated and extruded through a screw extruder. Although the metallic pigment and the powder coating can be sufficiently mixed, the metallic pigment is insufficiently oriented in the high viscosity melt. Further, in the next pulverization process, the sheet-like structure of the pigment is inevitably destroyed. The metal powder produced by this method has a metallic effect with a gray color. Therefore, this method is only used for the production of hammer grain powder.
2, dry mixing method:
The method is to add a dry powder of metallic pigment to a pulverized powder coating and mix it with a mechanical mixer. The advantage of the dry mixing method is that the metallic pigment and the powder coating are not very intensely mixed, thereby preventing deformation of the sheet metal pigment, and the metal effect is thus not affected. In addition, the loose pigment/resin mixture is also very advantageous for the orientation of the metallic pigments and improves the glittering effect. The disadvantage of this method is that when the recycled powder is treated by the automatic spraying equipment, the separation phenomenon is caused by the difference in shape, density and charged charge of the metal pigment and the resin powder particles.
3. Bonding-Process:
Le procédé mélange le pigment métallique et le revêtement en poudre pendant le chauffage, de sorte que la température dépasse juste le point de ramollissement de la résine, et le pigment métallique peut être lié de manière fixe à la surface de la poudre de résine visqueuse, empêchant ainsi l'application de la poudre . Séparation des pigments métalliques et des poudres de résine lors de la neutralisation après construction. C'est la loi populaire sur le cautionnement.
