1 | The lignin is not needed in papermaking, however. | |
2 | Besides cellulose, there are hemicellulose and lignin. | |
3 | The more densely packed the fibers and lignin, the stronger the bamboo. | |
4 | In the kraft paper process, lignin is solubilized by caustic soda. | |
5 | The stover is abundant and renewable resource and mainly consists of cellulose , hemicellulose and lignin. |