| Titre : |
Fundamentals of equipments used for pigment dispersions |
| Type de document : |
texte imprimé |
| Auteurs : |
Shraddha Gorhe, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 65-76 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Broyeurs
Dispersions et suspensions -- Appareils et matériels
Fragmentation
Pigments
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
The effectiveness of the dispersion operation is directly related to the ability of given vehicle to wet out the pigment particle agglomerates, to spread out over the particle surfaces, and finally to effect a lasting particle separation. The success of this operation is closely tied in with the ability of the grinding equipment to work in harmony with the grinding vehicle by expeditiously breaking up and exposing particle surfaces to the vehicle wetting and dispersing action.
The breakup of particle agglomerates can be accomplished by either smearing or smashing types of dispersion equipment. So the classification of paint and ink grinding equipment can be done into smearer or smasher categories or hybrid equipment (mixture of these two).
For the optimum breakup of particle clusters, smashers work most effectively when unhindered by viscous resistance, whereas smearers (conversely) must encounter strong viscous resistance to be effective at alI.
Advanced dispersion technology for pigment dispersion that is different from all other techniques is now available. This technology enables enormous reductions in production costs and process times. Additional effects are a higher degree of dispersion, improved quality and raw material savings.
Not only effective dispersion but the primary contributor to plant quality and safety is the design and selection of equipment. When operating at an industrial scale, the dangers associated with dispersion equipment are many. While selecting dispersion equipments, safety should be most important parameter.
In this review paper, seven classes of conventional grinding (dispersion) equipments are discussed. Two of them essentially smearer type (three-roll mill, high-speed stone mills), and one is smasher type mill (high-speed impingement mill). The remaining are hybrid mills that provide both smashing and smearing activity in varying degrees to accomplish pigment dispersion. It also covers advanced dispersion technology mills and plant safety related to dispersion equipments. |
| Note de contenu : |
- What is dispersion ?
- What is the benefit of pigment dispersions ?
- How does dispersion take place ?
- Critical factors in dispersion process
- Smearing versus smashing dispersion equipment
- Equipments used for dispersion
- Roller mills (three-roll mill)
- Bad mill
- Attritors and vibration mills (modifief ball mills)
- Vibration mills
- High-speed disk disperser
- High-speed stone mills
- Description of operation
- High-speed impingement mills
- Advanced dispersion technology
- Dispersion equipment - plant quality and safety
- Explosion proof equipment
- The right sized vessel
- Safety features |
| En ligne : |
https://drive.google.com/file/d/1BMP_nOzYKokgWaFQmFvvEAJLVIY8-lwE/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29258 |
in PAINTINDIA > Vol. LXVII, N° 8 (08/2017) . - p. 65-76
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