Journal article

Printing via hot embossing of optically variable images in thermoplastic acrylic lacquer

Patrick W Leech, Robert A Lee, Tim J Davis

Microelectronic Engineering | ELSEVIER | Published : 2006

Abstract

A novel printing process via hot embossing of either grating or micro-mirror microstructures has been demonstrated in thermoplastic acrylic lacquer. Embossing experiments were performed in the temperature range 100-150 °C and at 80 kN force. The range of microstructures has included a dot-matrix hologram, grating-based optically variable devices (OVDs) and a micro-mirror based OVD. High quality replicas of each type of device have been fabricated using this process. Embossed replicas of grating-based OVDs have shown optical effects including image switching and color movement. For devices based on micro-mirror arrays, the embossed replicas have shown an optically variable switch between a po..

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University of Melbourne Researchers