The 3d observation of the ink penetration in paper by confocal scanning laser microscope

Published: 2004

Author(s):
Ozaki, Y.
Bousfield, D.
Shaler, S. M.

Publication Name: Proceedings of the International Printing and Graphic Arts Conference

Publication URL: https://www.researchgate.net/publication/290191137_Three-dimensional_observation_of_coated_paper_by_confocal_laser_scanning_microscope

Research Area:
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Abstract:

A new method to image the coating layer uses a confocal laser scanning microscope (CLSM). A fluorescent dye, Rhodamine B, stains coated paper and is rinsed off. Rhodamine B preferentially stains latex binder in the coating, only slightly staining kaolin clay, calcium carbonate pigments, and cellulose in the base paper. A laser beam scans a specimen, and a photodetector collects the fluorescent light emitted. Information about the coating layer can be obtained nondestructively over a wide area. With this new technique, the three-dimensional structure of a paper coating layer was observed. The results were used to characterize the depth of the coating layer penetration into the base paper, the occurrence of bubbles, and the possible distribution of latex and optical brightener. The structure of double-coated papers was also discernible. The technique could be used to locate other coated paper components if they can be tagged with fluorescent dye.