Epson TM-L90 Technical Reference Manual page 161

Transparency rate of die-cut label paper
If transparency (without black marks) label is used, use a label that meets the following
requirements so that the printer can recognize the label position:
Note:
❏ Transparency rates are measured by the Macbeth TD-904 (with a filter for infrared) photometer. The
transparency rates are calculated as follows:
Use
Density = Log
Then,
Transparency rate (%) = (Amount of transparency / Amount of irradiation)
❏ If the transparency rates are out of the specified range (label + backing paper: 18% or less, backing
paper: 47% or more), the printer detects a layout error. However, paper identified with a layout error
may be used when the detection hole is prepared as follows. The position to detect the label may be
shifted by approximately 0.5 mm {0.02"}.
10
(Amount of irradiation / Amount of transparency)
1.75  0.5
Corner R0.5
or less
6  0.5
8.0  0.1
Corner R2 or less
TM-L90/TM-L90 Peeler Model Technical Reference Guide
(label + backing paper):
transparency 18% or less
(backing paper): transparency
47% or more
0.5  0.3
5.0  0.5
(4)
0.5  0.3
Face (printed side)

100
Detection hole
[Units: mm]
Appendix 161