A quantitative comparison of in-line coating thickness distributions obtained from a pharmaceutical tablet mixing process using discrete element method and terahertz pulsed imaging
cam.issuedOnline | 2018-06-18 | |
dc.contributor.author | Pei, C | |
dc.contributor.author | Lin, H | |
dc.contributor.author | Markl, D | |
dc.contributor.author | Shen, YC | |
dc.contributor.author | Zeitler, JA | |
dc.contributor.author | Elliott, JA | |
dc.contributor.orcid | Zeitler, Axel [0000-0002-4958-0582] | |
dc.contributor.orcid | Elliott, James [0000-0002-4887-6250] | |
dc.date.accessioned | 2018-10-18T10:20:37Z | |
dc.date.available | 2018-10-18T10:20:37Z | |
dc.date.issued | 2018 | |
dc.description.abstract | The application of terahertz pulsed imaging (TPI) in the in-line configuration to monitor the coating thickness distribution of pharmaceutical tablets has the potential to improve the performance and quality of the spray coating process. In this study, an in-line TPI method is used to measure coating thickness distributions on pre-coated tablets during mixing in a rotating pan, and compared with results obtained numerically using the discrete element method (DEM) combined with a ray-tracing technique. The hit rates (i.e. the number of successful coating thickness measurements per minute) obtained from both terahertz in-line experiments and the DEM/ray-tracing simulations are in good agreement, and both increase with the number of baffles in the mixing pan. We demonstrate that the coating thickness variability as determined from the ray-traced data and the terahertz in-line measurements represents mainly the intra-tablet variability due to relatively uniform mean coating thickness across tablets. The mean coating thickness of the ray-traced data from the numerical simulations agrees well with the mean coating thickness as determined by the off-line TPI measurements. The mean coating thickness of in-line TPI measurements is slightly higher than that of off-line measurements. This discrepancy can be corrected based on the cap-to-band surface area ratio of the tablet and the cap-to-band sampling ratio obtained from ray-tracing simulations: the corrected mean coating thickness of the in-line TPI measurements shows a better agreement with that of off-line measurements. | |
dc.identifier.doi | 10.17863/CAM.31471 | |
dc.identifier.eissn | 1873-4405 | |
dc.identifier.issn | 0009-2509 | |
dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/284100 | |
dc.language.iso | eng | |
dc.publisher | Elsevier BV | |
dc.publisher.url | http://dx.doi.org/10.1016/j.ces.2018.06.045 | |
dc.subject | Terahertz in-line sensing | |
dc.subject | Terahertz pulsed imaging | |
dc.subject | Coating thickness variability | |
dc.subject | Discrete element method | |
dc.subject | Pharmaceutical coating | |
dc.title | A quantitative comparison of in-line coating thickness distributions obtained from a pharmaceutical tablet mixing process using discrete element method and terahertz pulsed imaging | |
dc.type | Article | |
dcterms.dateAccepted | 2018-06-15 | |
prism.endingPage | 45 | |
prism.publicationDate | 2018 | |
prism.publicationName | Chemical Engineering Science | |
prism.startingPage | 34 | |
prism.volume | 192 | |
pubs.funder-project-id | Engineering and Physical Sciences Research Council (EP/L019922/1) | |
rioxxterms.licenseref.startdate | 2018-12-31 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.type | Journal Article/Review | |
rioxxterms.version | AM | |
rioxxterms.versionofrecord | 10.1016/j.ces.2018.06.045 |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- PeiC_TPI_DEM_r8_text_revised_plain_r1.pdf
- Size:
- 1.47 MB
- Format:
- Adobe Portable Document Format
- Description:
- Accepted version
- Licence
- http://www.rioxx.net/licenses/all-rights-reserved
License bundle
1 - 1 of 1
No Thumbnail Available
- Name:
- DepositLicenceAgreement.pdf
- Size:
- 417.78 KB
- Format:
- Adobe Portable Document Format