B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 55/02 (2006.01) C25D 11/04 (2006.01) C25D 11/26 (2006.01) G09F 3/02 (2006.01) G09F 3/03 (2006.01)
Patent
CA 2083845
Color change devices which are capable of undergoing a color change on bending. The devices comprise a flexible sub- strate (24) having a color generating metal (e.g. a valve metal such as Ta or Nb) at at least one surface and an intimately contact- ing optically thin anodic film (30) covering the color generating metal and generating a visible color by light interference and ab- sorption effects. The thin anodic film (30) is produced by anodizing the color generating metal in the presence of an adhesion- reducing agent (e.g. a fluoride) for weakening the normally tenacious bond between the anodic film and the metal. Devices of this kind capable of being activated by bending, as well as by separation of the constituent layers, are produced by carrying out the anodization step in the presence of a particular concentration of the adhesion reducing agent from a narrow range (e.g. 40-350 ppm of fluoride). The devices can be used as tamper evident labels and the like which show evidence of removal of the labels from articles to which they were originally attached as an indication of tampering.
Innes Robert A.
Smith Gary J.
Alcan International Limited
Kirby Eades Gale Baker
LandOfFree
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