XI San-cai 奚三彩
Zhejiang University


Paper as a medium of written information is extremely important for transmitting cultural and preserving history since the invention of papermaking technology 2000 years ago. Those paper relics such as books, paintings, newspapers and documents collected in museums, libraries and archives are extremely precious in studying the history, politics, economy, art and culture of China.

Paper is a kind of organic materials which main structure is cellulose fibers connected by linear β(1-4)D-glucopyranosyl units. With time goes on, both internal factors (effect of acid and change of texture) and external factors (temperature, humidity, illumination, corrosion of acidic gas, damaged by worms, mildew or mechanical wear) affected the quality of paper, leading to paper acidification, embrittlement or even ruined totally. Therefore, the preservation of paper relics is facing a grim situation.

Since de-acidification is the only way to extend the storage time of acidification paper, the scholars of every country devote to the viable means of removing acid since 1930s. At present, aqueous treatments, non-aqueous liquid-based systems treatments and gas-phase treatments are mostly used in the de-acidification and protection of paper relics, books and documents but it is not satisfactory enough. In recent years, Zhejiang University, Guanzhou University of Technology and Nanjing Museum made fast progress in exploring innovative methods for paper de-acidification on the basis of past experience. For instance, cold plasma technology was applied to the de-acidification and protection of paper heritage and documents by Xiwen Zhang, Sancai Xi, etc. form Zhejiang University.

This paper makes a brief introduction to the reason of paper acidification and the developments of de-acidification technology.


紙張屬於有機材料,主要化學成分是纖維素,由纖維素大分子中基團間的葡萄糖鍵連接而成。隨著歲月的流逝,在內在因素 (酸的作用和材質的變化) 與外在因素 (溫度、濕度、光照、酸性氣體侵蝕、蟲蛀、黴變及機械的磨損) 的影響下,導致酸化、發脆甚至粉化,紙張「自毀」正面臨著嚴峻的局面。