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Effect of Temperature and Moisture on Dynamic Viscoelastic Properties of Soybeans
| Content Provider | Semantic Scholar |
|---|---|
| Author | Singh, Pawan P. Maier, Dirk E. Campanella, Osvaldo H. |
| Copyright Year | 2001 |
| Abstract | The soybean crushing industry utilizes conditioning in the temperature range of 60–90 � C and moisture range of 9–12% to modify the viscoelastic properties of cracked soybeans in order to make them more deformable and to produce thin flakes for oil extraction. Viscoelastic properties of soybean cotyledons, namely G � and tan � in the temperature range of 30–120 � C and moisture range or 9.5–12.8% were determined using DMTA. In this moisture range, G � decreased at a rapid rate by 2–4 times due to an increase in conditioning temperature from 30 � C to 72.5–81 � C. Thus, flake thickness could be substantially reduced by conditioning soybeans up to 72.5–81 � C. The tan � curves showed a peak in the temperature range of 40–50 � C, which shifted to a lower temperature by 2–4 � C after a decrease in frequency from 1 Hz to 0.3 Hz. This indicates that the material underwent glass transition in this temperature range. In some experiments a second transition occurred at 95–105 � C. However, data was insufficient to conclude that this was a glass transition. In general, G � values below 10% moisture content were about two times greater than at higher moisture contents, which confirmed that at room temperature below 10% moisture content soybeans existed in a glassy state. Due to low deformability of soybeans in the glassy state, flaking below 10% moisture content would require higher mechanical energy and result in thicker flakes. |
| Starting Page | 1713 |
| Ending Page | 1719 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.13031/2013.6982 |
| Alternate Webpage(s) | https://works.bepress.com/dirk-maier/11/download/ |
| Alternate Webpage(s) | https://doi.org/10.13031/2013.6982 |
| Volume Number | 44 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
