The visual effect of increasing laser labeling exposure time on tangerine peel is shown in
Figure 2-2. At the lowest possible exposure time of 30 µs, the label was faint and hardly visible,
whereas at the highest exposure time of 120 µs, the etch markings merged into solid lines.
Calculations of laser etched surface area were done using Image processing software. In general,
the area covered by the etched markings increased with increase in exposure time (Figure 2-3).
The rate of peel surface area disruption declined at higher exposure times as etch markings began
to merge. Etched markings created with 45 µs exposure time were selected as the best among all
energy levels on the basis of visual appearance and area covered. This exposure time (45 µs)
creates less surface disruption while generating readable code. However, from Figure 2-2 and 2-3, higher exposure times create darker labels without significantly increasing peel disruption.
The visual effect of increasing laser labeling exposure time on tangerine peel is shown in
Figure 2-2. At the lowest possible exposure time of 30 µs, the label was faint and hardly visible,
whereas at the highest exposure time of 120 µs, the etch markings merged into solid lines.
Calculations of laser etched surface area were done using Image processing software. In general,
the area covered by the etched markings increased with increase in exposure time (Figure 2-3).
The rate of peel surface area disruption declined at higher exposure times as etch markings began
to merge. Etched markings created with 45 µs exposure time were selected as the best among all
energy levels on the basis of visual appearance and area covered. This exposure time (45 µs)
creates less surface disruption while generating readable code. However, from Figure 2-2 and 2-3, higher exposure times create darker labels without significantly increasing peel disruption.
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