It’s not only DMC who produce Z-twist thread for sewing machines. Just
about all threads intended for use with a domestic sewing machine -
embroidery, quilting, sewing seams, overlocking/serging - will be Z-twist
(left) because of the way sewing machines work, and I think that’s true for
industrial machines too. In almost all machines the needle goes into the
fabric taking a loop of thread with it and the shuttle hook, or whatever, that
forms the stitch with a second thread (bobbin or looper) enters the needle
thread loop from the right. That tends to tighten a Z-twist or loosen an
S-twist.
I've been doing some historical research into S and Z twists. Z twists
came to thier own with the advent of sewing machines, so now all thread
intended for sewing machine use is z twist.
Most threads prior to this time were S twists. Threads were used for
sewing and embroidery and lace work and all work 'better' with an S twist.
Ahhhh the role of technology and changes of use.
Anna from a warm sunny Sydney
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