Materials 2025 , 18 , 228
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T15 and T17, through the use of the implemented Optical System, denoting very well the huge physical differences that exist between both products.
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Figure 5. 3D map obtained for the tissue product T15: ( a ) top view of front side; ( b ) perspective view of front side; ( c ) lateral view of front side; ( d ) top view of back side; ( e ) perspective view of back side; and ( f ) lateral view of back side.
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Figure 6. 3D map obtained for the tissue product T17: ( a ) top view of front side; ( b ) perspective view of front side; ( c ) lateral view of front side; ( d ) top view of back side; ( e ) perspective view of back side; and ( f ) lateral view of back side. By comparing the views of the 3D maps shown in Figures 5 and 6, some points can immediately be reported: (1) the product T15 is indeed thinner, with values of approxi- mately 0.2 mm measured along the z direction, while the product T17 is a lot thicker, with values of approximately 0.8 mm to 1 mm measured along the z direction; (2) the embossing patterns of both products T15 and T17 are different; and (3) the surfaces of the product
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