Analysis of modern document paper for identification of counterfeit document (I) - Filler composition - Filler c

초록

In this study, the composition and content of filler within the 188 species of split sheets of a graduate thesis, whose publication year was verified, were analyzed to investigate the characteristics of modern document paper. Based on the results of ash-measurements and SEM-EDS analysis, it was found that major fillers, including talc, clay and calcium carbonate, are used in modern paper making. Between 1978 and 2000, talc was used as a major filler in document paper. Since around 2000, calcium carbonate was begun to be used, and calcium carbonate was mainly used in recent years. It is closely related with not only the use of calcium carbonate due to a conversion into neutral paper-making system in 1985 but also the decline of price due to a increase of domestic production of calcium carbonate in 1999. The ash content of the paper samples varied from about 10% to 30%. Several samples are assumed to contain fillers and coating pigments. To increase the reliability of analysis data, we need to continually sample and investigate more diverse documents. © 2018 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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