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Proceedings Paper

Online fluorescence-based coating thickness measurement in the production of hot stamping foils
Author(s): Jolyon M. O. De Freitas; James S. Barton; Julian D. C. Jones; Anita C. Jones; Michael Millington; Guy Gregory; Philip Spencer; Ian Bain; Stephen Cresswell
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Paper Abstract

Hot stamping foils are used in the printing industry to achieve metallic effects on packaging, pseudo-holographic images for security applications, and other products. The performance of the foil in the stamping process is in part determined by the thickness of the release coating on the carrier foil. This coating is too thin (approximately 10nm) for successful application of conventional measurement methods. We describe a fluorescence-based optical technique to measure the thickness of this release coating on-line. A fluorescent rhodamine dye added to the release coating allows excitation and detection in the visible part of the spectrum. Multimode optical fibre is used for excitation beam delivery and signal collection from a probe head situated on the coating machine. We outline the system calibration and show some representative results form industrial trials.

Paper Details

Date Published: 31 August 2000
PDF: 10 pages
Proc. SPIE 4076, Optical Diagnostics for Industrial Applications, (31 August 2000); doi: 10.1117/12.397943
Show Author Affiliations
Jolyon M. O. De Freitas, Scalar Technologies Ltd. (United Kingdom)
James S. Barton, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)
Anita C. Jones, Edinburgh Univ. (United Kingdom)
Michael Millington, Edinburgh Univ. (United Kingdom)
Guy Gregory, API Foils Ltd. (United Kingdom)
Philip Spencer, API Foils Ltd. (United Kingdom)
Ian Bain, Scalar Technologies Ltd. (United Kingdom)
Stephen Cresswell, Scalar Technologies Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 4076:
Optical Diagnostics for Industrial Applications
Neil A. Halliwell, Editor(s)

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