Table 6
Characteristics of fiberboards produced from RS through hot pressing, without (FB1 to FB18) and with SPI (SPI1 to SPI4).
| Fiberboard | Density (kg/m3) | Flexural strength (MPa) | Elastic modulus (GPa) | Shore D (°) | TS (%) | WA (%) |
|---|---|---|---|---|---|---|
| FB1 | 934 ± 33 | 3.9 ± 0.5 | 0.4 ± 0.0 | 57.6 ± 2.6 | n.m. | n.m. |
| FB2 | 1,055 ± 27 | 7.0 ± 0.8 | 0.9 ± 0.1 | 65.2 ± 0.8 | n.m. | n.m. |
| FB3 | 1,091 ± 33 | 8.4 ± 0.7 | 1.1 ± 0.1 | 65.6 ± 1.9 | n.m. | n.m. |
| FB4 | 1,154 ± 27 | 9.0 ± 1.0 | 1.1 ± 0.2 | 63.8 ± 0.8 | n.m. | n.m. |
| FB5 | 1,185 ± 19 | 10.6 ± 1.1 | 1.4 ± 0.1 | 64.0 ± 0.7 | n.m. | n.m. |
| FB6 | 1,206 ± 33 | 11.6 ± 1.2 | 1.6 ± 0.1 | 65.4 ± 0.7 | n.m. | n.m. |
| FB7 | 1,234 ± 20 | 12.7 ± 0.9 | 1.6 ± 0.2 | 65.8 ± 1.4 | n.m. | n.m. |
| FB8 | 1,236 ± 34 | 13.6 ± 1.2 | 1.7 ± 0.1 | 65.2 ± 1.9 | n.m. | n.m. |
| FB9 | 1,275 ± 12 | 16.4 ± 0.7 | 2.3 ± 0.2 | 65.9 ± 1.1 | 470 ± 10 | 449 ± 10 |
| FB10 | 820 ± 38 | 2.4 ± 0.1 | 0.3 ± 0.0 | 49.8 ± 0.6 | n.m. | n.m. |
| FB11 | 899 ± 8 | 3.7 ± 0.5 | 0.4 ± 0.0 | 57.9 ± 0.9 | n.m. | n.m. |
| FB12 | 970 ± 28 | 5.3 ± 0.4 | 0.7 ± 0.1 | 62.4 ± 0.9 | n.m. | n.m. |
| FB13 | 1,131 ± 22 | 8.2 ± 0.4 | 0.9 ± 0.1 | 63.5 ± 0.7 | n.m. | n.m. |
| FB14 | 1,204 ± 22 | 12.2 ± 1.3 | 1.3 ± 0.2 | 63.6 ± 1.5 | n.m. | n.m. |
| FB15 | 1,242 ± 37 | 15.8 ± 0.9 | 2.0 ± 0.1 | 65.3 ± 0.8 | 391 ± 49 | 362 ± 25 |
| FB16 | 1,252 ± 34 | 13.2 ± 1.1 | 1.6 ± 0.2 | 64.7 ± 0.8 | n.m. | n.m. |
| FB17 | 1,274 ± 32 | 16.4 ± 1.2 | 2.1 ± 0.2 | 65.3 ± 1.0 | 410 ± 34 | 396 ± 15 |
| FB18 | 1,304 ± 15 | 17.7 ± 1.7 | 2.3 ± 0.2 | 65.2 ± 1.7 | 306 ± 22 | 260 ± 22 |
| SPI11,2 | 1,267 ± 32 | 26.2 ± 0.7 | 3.3 ± 0.1 | 68.1 ± 1.2 | 192 ± 11 | 152 ± 8 |
| SPI21,3 | 1,270 ± 17 | 37.3 ± 0.7 | 4.6 ± 0.2 | 67.8 ± 1.3 | 169 ± 16 | 135 ± 8 |
| SPI31,4 | 1,234 ± 38 | 32.7 ± 1.1 | 4.1 ± 0.2 | 68.1 ± 1.3 | 137 ± 25 | 117 ± 9 |
| SPI41,5 | 1,152 ± 15 | 28.1 ± 1.2 | 2.8 ± 0.3 | 68.2 ± 1.1 | 84 ± 19 | 88 ± 2 |
200 °C mold temperature, 30 MPa applied pressure, and 3 min molding time for the hot-pressing conditions (i.e., those of FB18).
4.8% (w/w) for SPI in the solid mixture, corresponding to a SPI-to-RS ratio of 5% (w/w), or 7.7% total protein content in fiberboard.
9.1% (w/w) for SPI in the solid mixture, corresponding to a SPI-to-RS ratio of 10% (w/w), or 11.7% total protein content in fiberboard.
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