For determining the relaxation characteristics, a textile
fabric ‘stand’ type relaxometer was applied.47
The weight of 25% of the breaking load weight,
60 min loading time, was used for test strip (clamping
length: 200 mm, strip width: 25 mm) deformation. The
weights stretching the strips were hung from the lower
clamps. The deformation of test strips under load and
after load removal was registered by the lower clamp
vernier on the vertical scale with a precision up
to 0.5 mm.