| Abstract [eng] |
The Master’s final project includes the investigation of 12 knitted fabrics used in the production of sports and active leisure time closing and 4 adhesive PU films. Based on the standard (LST EN 14704-1), 5 cycles of stretching up to 10N force were performed to determine the tensile properties of the knitted fabrics: tensile indexes of their changes after cyclic stretching. The compression was determined by Laplace formulas at 10% and 20% deformation. The research results showed that not all knitted fabrics are suitable for the sports and active leisure time clothing production because they fail to cross the 1st compression class limit (<13,30 hPa) at 10% and 20% deformations in compression class standards and have high residual deformations (31,43-38,61%). The 3 fabrics (M12, M7 and M11), which had the best properties and the lowest residual deformation, were distinguished during the research. The fabric – M12 with a highest compression of 10% (41,03 hPa) and 20 % (64,27 hPa) was selected for the further research. In order to produce graduated compression pressure, adhesive systems are formed by gluing 14 mm wide films on M12 fabric along the length and on the direction of 45o degree. The compression properties of investigated adhesive systems were determined and adhesive system ensuring the best compression and the lowest residual deformation was selected. The results of the research showed that the adhesive films have an impact on the tensile strength indexes of the fabric and the results of the compression: it reduces tensile and residual deformation and increases compression. It was also found that the films which were glued along the specimen cause the greater compression (96,34-126,86 hPa) than those oriented diagonally (57,78-62,17 hPa). The research showed that 5500 Dream is the most suitable among all investigated films because the diagonal gluing ensures the lowest residual deformation (3.13% after the 1st cycle, 4.38% after 5th and the good compression (59,41 hPa). The compression of the single fabric M12 and the adhesive system M12+5500 Dream was analyzed using the Modaris 3D program by conducting special visualization of the sleeve on a cylinder created in 3Ds MAX program. The accuracy of this method was checked experimentally by determining compression changes with FlexitForce sensors at the testing points of the actual sleeve specimen. |
