執行成果摘要
Through fiber morphological observations, pineapple (Ananas comosus),mitsumata (Edgeworthia papyrifera), and gampi (Wikstroemia sikokiana) fibers were found to be similar to a typical suan paper fiber. Pineapple fiber was even more slender than the average. Thus, the 3 fibers were selected for pulping. With respect to pulping, NaOH soda pulping had better defibrillation efficacy; while sodium carbonate pulping produced higher yields but with poor defibration and less bright paper. Among the raw materials, pineapple leaves pulped easier, mere 5% of NaOH could effect defibrillation. E. papyrifera required 7.75% NaOH to obtain satisfactory defibrillation. Gampi was found to be most resistant to defibration and required the highest dose. When liquor to material ratio increased to 15, then even lower doses produced satisfactory defibrillation efficacy. In bleaching experiments, A. comosus and E.papyrifera could attain designed brightness with a single stage hypochlorite bleaching; gampi, due to its higher lignin content, however, required a 2-stage pulping. Although hydrogen peroxide is not known for delignification prowess, however, for better pulp yield post-bleaching and better brightness stability, a 2 stage H-P was used. Despite a portion of the physical properties of the self-made papers were inferior to the standard item in smoothness and brightness, most others were superior. Of the 3 fibers, only E. papyrifera sheets had poorer smoothness, while all others had smoothness values ＞ 10 s. Pineapple sheet had smoothness as high as 50 s. Regardless of tensile, folding,tear and burst strengths, pineapple papers were superior and folding endurance was rather phenomenal. Brightness of pineapple sheet was the highest and that of gampi was the poorest.