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Fig. 6. Silking force and tensile properties of fibres retrieved from a forced
silking process characterized by very low silking force. (A) Silking force
vs position along the silk fibre obtained from a silking process at 1
mm s–1 reeling speed. The numbered intervals identify the
samples shown in B and C. (B) Force–displacement curves of the silk
samples obtained in the forced silking process shown in A. Base length=20 mm.
For A and B, nominal reeling/test conditions were T=20°C,
relative humidity=40%. (C) Stress–strain curves obtained by re-scaling
the force–displacement curves in B using the individual cross-section of
each sample. The upper and lower limits of the range of tensile properties
exhibited by naturally spun (NS) fibres, and the stress–strain plots of
maximum supercontracted (MS) fibres and typical forcibly silked (FS) fibres
are plotted as dotted lines to allow comparison. In B and C, samples are
identified by a number, indicating the reeling interval in which they were
spun, as labelled in A.
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