[article]
| Titre : |
Handling the powder problem |
| Type de document : |
texte imprimé |
| Auteurs : |
Jo Smewing, Auteur |
| Année de publication : |
2004 |
| Article en page(s) : |
p. 9-11 |
| Langues : |
Anglais (eng) |
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
This paper looks at powder flow in the paints and coatings industry, the need for accurate testing and its benefits to manufacturers.
It has been estimated that powders account for 50% of materials used in industry. In paints, coatings and adhesives, this proportion is even higher. Handling and processing powders, particulates and granules is central to the paints and coatings industry, but has traditionally been fraught with problems due to their unpredicable and irregular behaviour, specifically with respect to flowability. With so many raw materials, semi-finished and finished products in powder form, this sector stands to gain significant manufacturing and commercial benefits from improvements in the assessment of powder flow. Recent technological developments are now poised to deliver those advantages.
Powder handling and processing tends to be problematic because powders exhibit properties similar to both solids and liquids. Normally, they are surrounded by air and combine in many ways to change the way the powder behaves. Many common manufacturing problems are attributed to incorrect powder flow, including non-uniformity (segregation) in blending, under- or over-dosage, inaccurate filling and obstructions and stoppages. These in turn lead to excessive rejected material, machine down-time and defective end-products. Storage, handling, production, packaging, distribution and end use can all be negatively affected by common powder flow problems.
Knowing a powder's characteristics - and the factors which impact on it - is therefore essential. This allows the optimisation of formulation, equipment and incorporates quality control principles throughout production, thereby assisting in process design, performance evaluation and troubleshooting. |
| Note de contenu : |
- Accurate flow measurement
- Traditional measurements
- Instrument-based testing
- Controlled flow
- Specialist software
- Technology for flexibility |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27687 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 194, N° 4481 (10/2004) . - p. 9-11
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Handling the powder problem in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 194, N° 4481 (10/2004)
