Online fluorescence-based coating thickness measurement in the production of hot stamping foils

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

doi:10.1117/12.397943

31 August 2000 Online fluorescence-based coating thickness measurement in the production of hot stamping foils

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

Author Affiliations +

Proceedings Volume 4076, Optical Diagnostics for Industrial Applications; (2000) https://doi.org/10.1117/12.397943
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom

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.

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Jolyon M. O. De Freitas, James S. Barton, Julian D. C. Jones, Anita C. Jones, Michael Millington, Guy Gregory, Philip Spencer, Ian Bain, and Stephen Cresswell "Online fluorescence-based coating thickness measurement in the production of hot stamping foils", Proc. SPIE 4076, Optical Diagnostics for Industrial Applications, (31 August 2000); https://doi.org/10.1117/12.397943

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