臭氧應用于鐘麻硫酸鹽漿無氯漂白之研究

Ozone Bleaching on Kenaf Kraft Pulp

林曉洪(Sheau-Horng Lin) ； 王秀華(Hsiu-Hwa Wang)

《林產工業》 17卷1期 (1998/03) Pp. 171-183

https://doi.org/10.6561/FPI.1998.17(1).12

摘要

白度25.9%，卡巴值25.2之全桿鐘麻未漂硫酸鹽紙漿經硫酸+DTPA前處理，臭氧、過氧化氫等無氯漂白序列，ZEPP四段後，可達76%GE之白度值。於臭氧單段漂白時，紙張厚度、鬆度及紙漿粘度均隨臭氧耗（0.6%-1.0%）之增加而降低，惟紙張白度及耐摺度外之物理強度，則隨臭氧耗量而增加；臭氧為首之多段漂白，於紙漿濃度40%時，可得最佳紙張物理強度；同一紙漿濃度下，0.8%之臭氧耗量可獲最佳手抄紙物理強度，1.0%之臭氧耗量則白度最高，惟紙漿粘度最低且紙力最遜。漂白後段以過氧化氫處理對紙漿白度之穩定具有改善效果。ZEP或ZEPP無氯多段漂白序列之鹼萃處理對紙漿之抗撕及破裂指數有相當巨幅之負面作用宜審慎行之。全桿鐘麻硫酸鹽紙漿行ZEP或ZEPP之多段無氯漂白可達書寫用紙之白度要求，又無環境污染之虞，頗具可行性，值得採用。惟基於漂白成本，於工廠實際作業時，應以紙漿最終用途為指標，審愼設計漂白程序。

關鍵字

鐘麻 ； 硫酸鹽紙漿 ； 無氯漂白 ； 黏度 ； 紙張強度 ； 白度 ； 白度回降

並列摘要

Multistage bleaching is a must in promoting the brightness of kenaf whole-stem kraft pulp which showed an original brightness of 26% GE at 25.2 kappa no. Pulp viscosity as well as the caliper and density of the hand-sheet decreased with increasing ozone input (0.6-1.0%) in single stage ozone treatment, while brightness and strengths (except folding endurance) increased obviously. With multistage non-chlorine bleaching, initiated with ozone treatment, kenaf pulp reached its optimum strength and brightness at an initial pulp consistency of 40%. No matter what consistency was applied, 0.8% ozone input enables the fibers to reach their best strength performance.More stages though 'directed to higher brightness, pulp strength and viscosity indicated, on the contrary, inferior results along with higher cost. A hydrogen peroxide post treatment on the ozone treated pulp obviously increased its brightness stability, while a sulfuric acid pretreatment with the addition of DTPA turned out to present better strength. Alkali extraction between ozone and peroxide treatments degraded the fibers severely which resulted in a dramatic drop in tear and burst index. Care must be taken in carrying out this step.

並列關鍵字

Kenaf ； Kraft pulp ； Free-chlorine bleaching ； Ozone ； Strength properties ； Brightness ； Viscosity ； Brightness reversion