Bending Measurement
Mechanical testing apparatus quantifies fabric resistance to curvature during standard laboratory procedures. The kawabata kes-fb2 applies a controlled moment to a specimen strip while sensors record the resulting angular deformation across a defined range. Data from this sensor array output specific values for bending rigidity and hysteresis.
Engineers utilize these measurements to predict how garments drape on a human frame.
Loading Force
Operational parameters dictate that the sample remains clamped under a constant tension to remove initial crimp. An arm rotates the specimen through an arc of ninety degrees in both positive and negative directions. Torque values derived from this physical movement inform the calculation of the bending stiffness constant.
High stiffness coefficients indicate materials that resist forming folds or pleats in final assembly.
Material Response
Nonlinear elastic behavior appears during the cyclic deformation process. Fabrics exhibiting significant hysteresis lose energy as internal friction between fibers dissipates the applied force. Production managers rely on these profiles to ensure consistency between different lots of identical quality.
Variations in finish application often alter these physical properties beyond acceptable tolerances.
Measurement Boundary
Calculations exclude edge effects caused by specimen preparation or clamping pressure variations. Calibration occurs by hanging standardized weights to verify torque sensitivity before every batch run. Accuracy depends upon strict adherence to humidity and temperature controls within the testing chamber.
Consistent results depend entirely on the precision of the specimen cut relative to the grain line of the textile.
