[article]
| Titre : |
The turn of the screw |
| Type de document : |
texte imprimé |
| Auteurs : |
Michael Dillon, Auteur |
| Année de publication : |
2002 |
| Article en page(s) : |
p. 14-18 |
| Langues : |
Anglais (eng) |
| Catégories : |
Extrudeuse bi-vis
Mélange
Revêtements poudre:Peinture poudre
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The author looks at advances in twin screw extruders for powder coating applications.
Powder coatings have become widely established because of their ease of use without the need for solvents, together with high physical strength and a range of finishes. Formulations based on premixes of epoxy, polyester, acrylic and polyurethane thermosetting resins are compounded with a variety of pigments, fillers, curing agents, flow modifiers and so on to suit specific end-use requirements. During the compounding process, the resin is melted and the ingredients are mixed uniformly to produce a homogenous melt, which is subsequently cooled and flaked before grinding into a fine powder and classifying. The compounding process is well suited to the operating and mixing behaviour of the corotating twin screw extruder. |
| Note de contenu : |
- Factors influencing mixing
- Extruder developments
- Laboratory extruders
- Drive power
- Barrel design
- Powder intake
- Reprocessing fines
- High screw speed
- Process stability
- FIGURES : 1. Extruder layout using starve feeding - 2. Effect of high capacity intake feed screws - 3. Key stages in the output enhancement of the APV MP-PC extruder - 4. Torque variation during starve feeding - 5. Extruder layout using side feeding |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28094 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4450 (03/2002) . - p. 14-18
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