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

n.m., non measurable (test specimens disintegrated, at least partially, after 24 h immersion).

1

200 °C mold temperature, 30 MPa applied pressure, and 3 min molding time for the hot-pressing conditions (i.e., those of FB18).

2

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.

3

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.

4

16.7% (w/w) for SPI in the solid mixture, corresponding to a SPI-to-RS ratio of 20% (w/w), or 18.7% total protein content in fiberboard.

5

28.6% (w/w) for SPI in the solid mixture, corresponding to a SPI-to-RS ratio of 40% (w/w), or 29.7% total protein content in fiberboard.

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