無碳複寫紙與雷射印表紙的再生技術

Recycling of Carbonless Paper and Laser-Printed Paper

蘇裕昌(Yu-Chang Su) ； 何振隆(Chen-Lung Ho)

《台灣林業科學》 20卷4期 (2005/12) Pp. 303-313

https://doi.org/10.7075/TJFS.200512.0303

摘要

本研究係探討無碳複寫紙再生後產生再生紙漿低白度或具黑斑之處理技術，並同時探討雷射印表紙再生時之難脫墨之問題。試驗結果顯示在無碳複寫紙之再生作業前，施以顯色前處理，則進入脫墨程序時，可將有色粒子有效去除，可以有效解決回收再生紙漿白度低落之問題。至於彩色無碳複寫紙，如：黃色之廢紙，可利用二次漂白處理，在洗滌脫墨加入2% H2O2，並於浮選段後再增加一段2~6%之H2o2漂白，所得再生紙漿，白度可達80% ISO以上，且具高白度安定性。紅色之廢紙，可施以次氯酸鹽加過氧化氫(NaOCl/H2O2)，二段漂白系統（NaOCl 3~5%及H2O2 2~4%），處理效果最為良好，白度可達75% ISO以上且具相當之白度安定性。
另外，以傳統化學脫墨法進行雷射印表紙再生時產生不易脫墨及殘存墨斑之問題。試驗結果顯示可應用添加各種長碳鏈醇，以改善脫墨效率，長碳鏈醇具有將墨點凝聚功能，而使墨點粒徑變大之現象，尤其以十八醇及十八醇加丁醇此二組效果最佳。脫墨處理時，改變一般傳統的洗滌脫墨及浮選處理之方法，而以洗滌脫墨後立即進入淨漿機之方法，以添加十八醇、卡八醇及丁醇等二組脫墨劑，其墨點所佔面積可降至淨漿後的5ppm，再生紙漿白度可達95% ISO以上。另外本法為脫墨處理後，直接進入淨漿段，可省略浮選段，處理也可將墨點幾乎全部去除，堪稱節省相當之成本及水資源。

關鍵字

無碳複寫紙 ； 漂白 ； 雷射印表紙 ； 正十八醇

並列摘要

In this study, we attempted to treat the causes of low brightness and the tendency of black spots to appear on the recycled pulp of carbonless paper. The difficult problem of deinking laser-printed paper was also included in this study. Our experimental results indicated that in the recycling of carbonless paper, a color rendering pretreatment before the deinking process effectively removed colored particles and resolved the low brightness problem. As for colored carbonless paper, such as yellow sheets, a 2-stage bleaching entailing adding 2% H2O2 before washing and a further 2~6% H2O2 bleaching after flotation produced pulp with a brightness of 80% ISO or better, and the pulp showed good brightness stability. Red-colored waste carbonless paper could be subjected to a 2-stage bleaching consisting of 3~5% NaOC1 and 2~4% H2O2, to achieve the best results of brightness values of 75% ISO or better and also relatively good brightness stability. In the deinking of laser-printed paper, residual ink specks were an often-encountered problem. Our experiments suggested that by adding various long-chain aliphatic alcohols, deinking efficiency could be improved. Such additives reduced the capability of aggregating ink particles, hence forming large-diameter ink dots that could effectively be removed. Among the alcohols, n-octadecanol and a mixture of n-octadecanol and n-butanol showed the best results. In our deinking scheme, we modified the traditional washing and flotation process by washing and centri-cleaning. The 2 types of alcohols could lower the dirt count values of deinked pulp to 5 ppm and produce pulp brightness values of 95% ISO or better. Furthermore, by going from washing directly to centri-cleaning, the flotation stage was bypassed and nearly all of the ink specks were removed as well; hence, we deemed that the process should reduce process costs and also lessen water consumption.

並列關鍵字

carbonless paper ； bleaching ； laser-printed paper ； n-octadecanol