| Abstract [eng] |
Three knitted fabrics and adhesive systems made of knitted fabrics and adhesive polyurethane film (thickness 0,33 mm, density 139 g/m2) were investigated in the master’s final project. Specimens were stretched to 50 % fixed elongation performing 10 cycles. The parameters of tensile force and permanent deformation were analyzed to determine the deformation properties of knitted fabrics and the influence of adhesive film on the tensile properties of knitted fabrics after cyclic stretching. The results of the study showed that after 10 stretching cycles tensile force of the knitted fabrics decreased by 6.5-18.0 % in the longitudinal direction and by 9.1-13.1 % in the transverse direction, the permanent deformation increased by 35.7-58.5 % in the longitudinal direction and 34.5-60.3 % in the transverse direction. The tensile force of the adhesive systems decreased by 17.3-19.7 % after 10 cycles, and the permanent deformation increased by 50.6-55.1 %. It was found that the arrangement of adhesive stripes and the area covered by the film influenced the tensile force and permanent deformation of all investigated materials during cyclic stretching. The larger the area of the material was covered by the adhesive elements, the higher the tensile force was required to stretch the material up to 50 % elongation. The adhesive elements increased the tensile force of the material after 10 cycles from 2.4 (film cover 40 %) to 3.3 (film cover 68 %) times compared to not covered material. Knitted fabric A3 (80 % PA, 20 % EL, interlock knit, thickness 0.60 mm, density 335 g/m2) was chosen to design the compression full leg sleeve. A tensile force of A3 in the longitudinal direction ensured a high tensile strength during the squatting exercise. The high tensile force of A3 material and the lowest increase in permanent deformation in transverse direction ensured 1st compression class and maintained the compression properties also the garment’s shape during repeated wearing. The design and visualization of the compression full leg sleeve with purposefully positioned adhesive stripes on a virtual mannequin was performed using Modaris (CAD Lectra) software. The compression values were determined by the Laplace equation, using a radius of leg curvatures and the strain of the material at the garment local points, when fitting it on a virtual mannequin. Compression values varied from 23.17 ± 1.94 mmHg in the ankle to 13.41 ± 1.50 mmHg in the thigh to ensure the 1st compression class and comfort properties of the garment. The compression full leg sleeve without the adhesive stripes and with the stripes were fitted on the virtual mannequin in the squat position. It was defined that the use of adhesive stripes increased the tensile strength by 328.0 % in the longitudinal direction of the garment during the squat exercises compared to the garment without stripes. The real prototype of compression full leg sleeve was produced. |
