Studies on the Bleaching of Deinked Pulp

• Main Authors: Kao, Der-Lin, 高德霖
• Other Authors: Feng-Jyi Chang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/63927875440765667755

碩士 === 國立中興大學 === 森林學系 === 85 === More and more, recycled fiber have been adoped in the manufacture of printing and writing papers. Thus the deinking and bleaching process is becoming more important. To meet the requirements for these recycled-fiber made products to fulfill the expected performance , deinking and bleaching opperations should be operated adequately. In order to get better understanding of operational factors of these processws, several kinde of wastepapers have been used in this study in order to compare the difference betw the major experimental results were summarized as follows: Addition of deinking agents over 2% will cause negative effects. Addition of 1-2% hydrogen peroxide in deinking operation gains higher brightness. More washing steps after deinking operation will gain higher brightness. For deinked pulp of old magazine, floation then washing results in higher brightness. For deinked pulp of old books and printer sheets, washing then floation results in higher brightness. Repulped wasterpapaer should be deinked in the shortest time to avoid dispersed ink redeposit on the surface of fibers.