Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating
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The Ohio State University / OhioLINK
2009
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1237132651 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12371326512021-08-03T05:55:34Z Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating Somboonvechakarn, Chanun Food Science separation powder coatings targeting loss adhesion loss mixture Powders used during coating usually consist of a mixture with different physical properties, such as particle size and density. Two mixtures with the same composition but different sizes: 44 and 256 mm NaCl, and 64 and 191 mm starch; and two mixtures with sizes close to one another but different densities: 44 mm NaCl and 64 mm starch, and 197mm NaCl and 191 mm starch, were nonelectrostatically and electrostatically coated on grounded targets. Separation of mixtures was measured by comparing the percentages of each powder on the target to determine whether size caused separation. Targeting loss and adhesion loss, when coated individually and in mixtures, were determined. During nonelectrostatic coating, mixtures of NaCl and starch separated by size due to the difference in targeting losses between small and large powders, both individually and in mixtures. Adhesion losses had a small effect. Interactions occurred due to being in a mixture reduced separation for NaCl, but increased separation in starch. Separation occurred because there was more large powder on most or all locations. During electrostatic coating, separation by size occurred due mainly to differences in adhesion loss in mixtures. For both NaCl and starch mixtures, there were more small powders closer to the nozzle due to electrostatic charge, while more large powders landed further away from the nozzle, causing separation, however, electrostatics did not affect separation compared to nonelectrostatic coating. Differences in density caused separation during nonelectrostatic coating of small mixtures. The separation was due mainly to differences between individual targeting losses, while the difference in adhesion losses was a less significant factor. There was more starch than NaCl on all targets, due to the differences in targeting losses. The interactions due to mixture increased separation. No separation was observed in the mixtures of large particles with different densities. During electrostatic coating, the differences in the individual targeting losses were large, but became insignificant when in the mixture. The differences in the individual adhesion losses were also large, but became smaller when in a mixture. In the small mixtures, there were more starch particles closer to the nozzle during electrostatic coating. Overall, nonelectrostatic coating causes high targeting loss for all powders, therefore coating systems need to be designed to minimize the problem. Electrostatics coating increased the differences in adhesion loss, therefore methods such as adding oil to the surface of the targets need to be applied in order to reduce adhesion loss difference. 2009 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1237132651 http://rave.ohiolink.edu/etdc/view?acc_num=osu1237132651 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Food Science separation powder coatings targeting loss adhesion loss mixture |
| spellingShingle |
Food Science separation powder coatings targeting loss adhesion loss mixture Somboonvechakarn, Chanun Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| author |
Somboonvechakarn, Chanun |
| author_facet |
Somboonvechakarn, Chanun |
| author_sort |
Somboonvechakarn, Chanun |
| title |
Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| title_short |
Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| title_full |
Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| title_fullStr |
Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| title_full_unstemmed |
Effects of Particle Size and Density on Separation of Mixtures During Nonelectrostatic and Electrostatic Powder Coating |
| title_sort |
effects of particle size and density on separation of mixtures during nonelectrostatic and electrostatic powder coating |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2009 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1237132651 |
| work_keys_str_mv |
AT somboonvechakarnchanun effectsofparticlesizeanddensityonseparationofmixturesduringnonelectrostaticandelectrostaticpowdercoating |
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1719427865419710464 |