Fabric stiffness can be measured using a hanging loop method for fabrics too limp to test with other methods. A strip of fabric is formed into one of three loop shapes - ring, pear, or heart - and its undistorted and actual hanging lengths are measured. The difference between the calculated undistorted length and measured hanging length indicates the fabric's stiffness.
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Stiffness
1. Fabric Stiffness, Bending & Drape
'Handle', the term given to properties
assessed by touch or feel, depends upon
subjective assessment of the fabrics by a
person.
2. Hanging loop method
Hanging loop method
Fabrics that are too limp to give a satisfactory result by the cantilever
method may have their stiffness measured by forming them into a loop and
allowing it to hang under its own weight. A strip of fabric of length L has
its two ends clamped together to form a loop. The undistorted length of the
loop /o, from the grip to the lowest point, has been calculated [1] for three
different loop shapes: the ring, pear and heart shapes as shown in Fig. 10.3.
If the actual length / of the loop hanging under its own weight is measured
the stiffness can be calculated from the difference between the calculated
and measured lengths d = I - I0: