512
T. Scherzer
0
20
40
60
80
100 120 140 160
0
20
40
60
80
100
120
140
160
4 Factors
RMSEC=2.4 g m
-2
Bias=-0.14 g m
-2
SEC=2.6 g m
-2
RMSEP=3.6 g m
-2
Bias=-0.32 g m
-2
SEP=3.5 g m
-2
R²=0.99
Coating Weight (NIR) [g m
-2
]
Gravimetric Coating Weight [g m
-2 ]
Fig. 21.22 PLS calibration model for the coating weight of the adhesive layer in bright polyesterbased three-layer laminates. Reprinted with permission by Elsevier B. V. from Ref. [30]
92 g m
-2
65 g m
-2
Fig. 21.23 Hyperspectral image of the distribution of the adhesive inside a black polyester-based
three-layer laminate. The gravimetric application weight of the adhesive was 80.9 g m −2 . Reprinted
with permission by Elsevier Ltd. from Ref. [52]
it was shown that the calibration and validation samples of the textile laminates had
a very high homogeneity. On the other hand, laminates with specific error patterns
(uncoated areas, overdosage, tears, folds, thick adhesive droplets etc.) were prepared.
All defects were clearly detected in the spectral images [30, 52]. In most cases, even
quantitative information about the defects were obtained. Figure 21.24 shows a repre-