The aim of this study is to characterize the surface of thermobonded nonwovens which can be used as surgical gowns or
caps in medical applications. These nonwovens consist of nets of polypropylene fibers which are more or less randomly
tangled and the cohesion of this surface comes from its manufacturing process through the bonding points. The tactile
feel of the consumer is known to depend on the structure of the surface, hence it will be deeply studied. We consider
degree of polarization images of the samples. Firstly the bonding points of a calendered nonwoven are detected using the
degree of polarization of the light reflected by the sample under polarized incidence and two sets of the same nonwoven
are differentiated through the analysis of their bonding points and of their fibrous part. We show that the degree of
polarization of the bonding points is linked to the intensity of the manufacturing process. The second part is about the
fibrous part of the nonwovens, studied in order to determine the main orientation of the fibers.
We describe an optoelectronic setup designed to evaluate the surface parameters of fabrics that influence their tactile feel. The developed texturometer uses the periodic structure of a textile material and its ability to reflect light to evaluate its surface properties through its polarimetric properties. The device scans the surface with a laser line and performs a temporal Fourier analysis of the reflected light, which allows us to consider the periodical structure of the material's surface. Instead of using the overall reflected energy, the analysis is performed on the degree of polarization of light. Results obtained with this new texturometer are compared to those obtained with a nonpolarimetric device that uses overall reflected energy. Emerized and nonemerized twill fabrics are tested, as well as spun-bonded nonwovens. We show that discrimination between samples is enhanced with this polarimetric texturometer. For emerized fabrics, the results exhibit a decrease in depolarization as emerizing intensity increases. For nonwovens, a complementary study in polarimetric imaging has been performed to better understand the phenomena. Nonwoven thermobonded points exhibit lower depolarization of the lightwave than the rest of the structure. Moreover, their depolarization differentiates the tested nonwovens.
This paper describes an optoelectronic setup which has been designed in order to evaluate some finishing process parameters of textile fabrics such as emerizing or raising. This evaluation is usually performed by trained people and our goal is to perform it in an automatic and objective way without any human operation. Our setup evaluates the periodical structure of fabrics through a temporal Fourier analysis of the degree of polarization of the light reflected by a fabric surface. The measurement sensitivity to surface hairiness is shown to be greatly improved when polarization is taken into account.
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