508
T. Scherzer
54.4 g m
-2
36.6 g m
-2
20.0 g m
-2
12.3 g m
-2
Fig. 21.18 Hyperspectral images of the distribution of a flame retardant on polyester fabric. In
the upper one, a spot pattern resulting from dried drops of finishing solution can be identified. The
gravimetric application weights of the samples were 13.2 (top) and 43.1 g/m 2 (bottom). Reprinted
with permission by Elsevier B. V. from Ref. [49]
The moisture content of synthetic fibers and yarns has been studied by NIR spectroscopy as well. Moisture is a critical parameter with respect to both properties
(e.g. morphology, many physical parameters such as glass transition temperature,
tenacity etc.) and processing (e.g. dyeing or lamination) of the textile materials. On
the other hand, the water content of hydrophilic polymers such as PA depends on
the relative humidity of the air or the occurrence of moisture in technical processing
steps. The maximum water content of PA is in the order of 2.5–3.5 wt% depending
on the specific type of PA. The moisture content of spun PA fibers was determined
by NIR spectroscopy with precisions (SEP) between 0.3 and 0.5% [38]. Similar
investigations were reported for PAN and viscose [39].
T. Scherzer
54.4 g m
-2
36.6 g m
-2
20.0 g m
-2
12.3 g m
-2
Fig. 21.18 Hyperspectral images of the distribution of a flame retardant on polyester fabric. In
the upper one, a spot pattern resulting from dried drops of finishing solution can be identified. The
gravimetric application weights of the samples were 13.2 (top) and 43.1 g/m 2 (bottom). Reprinted
with permission by Elsevier B. V. from Ref. [49]
The moisture content of synthetic fibers and yarns has been studied by NIR spectroscopy as well. Moisture is a critical parameter with respect to both properties
(e.g. morphology, many physical parameters such as glass transition temperature,
tenacity etc.) and processing (e.g. dyeing or lamination) of the textile materials. On
the other hand, the water content of hydrophilic polymers such as PA depends on
the relative humidity of the air or the occurrence of moisture in technical processing
steps. The maximum water content of PA is in the order of 2.5–3.5 wt% depending
on the specific type of PA. The moisture content of spun PA fibers was determined
by NIR spectroscopy with precisions (SEP) between 0.3 and 0.5% [38]. Similar
investigations were reported for PAN and viscose [39].