Understanding powder caking: Predicting caking strength from individual particle contacts
✍ Scribed by M. Wahl; U. Bröckel; L. Brendel; H.J. Feise; B. Weigl; M. Röck; J. Schwedes
- Book ID
- 104088918
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 644 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0032-5910
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✦ Synopsis
The chemical, pharmaceutical and food industries generate an average output of 300,000 tonnes of solid products per company per year. Caking of these products is therefore a major concern to the industry. This paper concentrates on caking due to crystal bridges formed under the influence of humidity. Using the micro-macro approach, it is shown how the bulk strength of caked solids can be predicted from individual particle contacts. The individual particle contact measurements are performed in a new test device, the DAPP system, built for particles in the half-millimetre size range. For the modelling, a contact-dynamics model was adapted to caked systems. It proved important to use the complete crystal bridge strength distribution in the simulation. Under these conditions modelling and validation experiment coincided to a factor of two.