Identification of pulp fibers in the chronological academic journals using spectroscopic method

To confirm the fiber characteristics of modern paper by nondestructive method, we collected samples for which the publication year was known, and analyzed by spectroscopic method. The average fiber length of all samples was over 1.0 mm and softwood pulps and hardwood pulps were distributed at various ratios. In the 1960s and 1970s, some long fibers were used to make paper. From the TCI results using IR spectra, the 2000's samples can be expected to use more hardwood pulp and chemical pulp than other years' samples. The lower HBI values in the 2000's suggest that the use of papermaking chemicals has increased. In terms of spectroscopic characteristics, TCI and HBI were different depending on the lignin contents and the amount of chemicals used. As a result of PCA analysis using IR spectrum data, it was confirmed that different clusters were formed depending on the amount of mechanical and chemical pulp used. In other words, the IR spectral data and the PCA system using it were able to confirm the characteristics of the fiber. However, in order to obtain higher reliability of the PCA system, it is necessary to collect a large amount of data.