| 摘要 |
A packet with a foil inner element is enhanced by the provision of printed images (111) on the removable upper part (112) of a foil inner liner (100). This removable part of the foil liner can be used as a voucher or to bear advertising messages or the like. Apparatus for ensuring that the image (111) is registered in an accurate position on the foil comprises driving rollers (22, 23; 45, 46) driven by an electric motor (29; 48) which is controlled by signals from a processor (27; 58) which receives input signals from a photocell (25; 57) for detecting registration marks (24) on the foil (14) as it passes a predetermined position on its path to a cutter (33; 51). The phase of the foil drive mechanism, taken, for example, from the cutter roller (33; 51), is detected and compared with the signal from the photocell (25) in order to determine whether the control drive rollers (22, 23; 45, 46) are to be advanced or retarded to maintain the print in register with the cut layer.
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