Official Journal of the Japan Wood Research Society
Table 2 Foaming characteristic times of the PU and W–PU foams containing varying contents of lignin
Sample | Cream time (s) | Gel time (s) | Free rise time (s) | Tack-free time (s) |
|---|---|---|---|---|
PU | 34 | 58 | 84 | 324 |
PU/L5 | 81 | 108 | 134 | 378 |
PU/L10 | 100 | 145 | 186 | 431 |
PU/L15 | 102 | 146 | 191 | 455 |
PU/L20 | 105 | 148 | 200 | 483 |
W–PU | 133 | 179 | 227 | 367 |
W–PU/L5 | 160 | 196 | 270 | 405 |
W–PU/L10 | 199 | 237 | 326 | 432 |
W–PU/L15 | 204 | 277 | 364 | 479 |
W–PU/L20 | 228 | 282 | 432 | 517 |