From Wikipedia, the free encyclopedia
ISO standard
ISO 2
is an
international standard
for direction of twist designation for
yarns
, complex yarns,
slivers
, slubbings,
rovings
,
cordage
, and related products.
[1]
The standard uses
capital letters
S
and
Z
to indicate the direction of twist,
[2]
as suggested by the direction of slant of the central portions of these two letters. The
handedness
of the twist is the direction of the twists as they progress away from an observer. Thus Z-twist is said to be
right-handed
, and S-twist to be left-handed. The convention of using these two letters to unambiguously designate twist direction was already used in the cordage industry by 1957.
[3]
References
[
edit
]
External links
[
edit
]
- ISO 2:1973
Textiles ? Designation of the direction of twist in yarns and related products
ISO
standards
by standard number
|
---|
|
1?9999
| |
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10000?19999
| |
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20000?29999
| |
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30000+
| |
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|