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ASTM D 1423 Document Information:
Title
Standard Test Method for Twist in Yarns by Direct-Counting
ASTM International
Publication Date:
Sep 10, 2002
Scope:
This test method covers the determination of the amount and
direction of twist at the completion of any stage of twisting
in single (spun or filament), plied, cabled, or novelty
(exclusive of long-term repeat patterns) yarns. The procedures
are designed primarily for yarns in packages, but, with special
precautions, they are applicable to yarns taken from fabrics.
The procedure for spun yarn in 9.2 is also applicable to
rovings.
For plied yarns, this test method covers the determination of
the twist of the plied yarns and the twist of the single yarn
before plying. For cabled yarns, the test method covers the
determination of the cable or hawser twist; the twist of the
plied yarn after plying, but prior to the last twisting
operation; and the twist of the single yarn before plying.
Procedures are also included for the determination of the
twists of the single and plied yarn components as they lie in
the final structure. Also, directions are included for the
determination of twist in plied yarn made with direct cabling
technology.
This test method is not intended for yarns that extend more
than 5.0 % when tension is increased from 2.5 to 7.5 mN/tex
(0.25 to 0.75 gf/tex). Following the procedures of this test
method for such yarns would be independent of the bias and
precision determined for this test method. The report from such
testing should include the tension used for this testing.
The values stated in either inch-pound or SI units are to be
regarded separately as standard. Within the text, the SI units
are shown in parentheses. The values stated in each system are
not exact equivalents; therefore, each system shall be used
independently of the other. Combining values from the two
systems may result in nonconformance within this test method.
NOTE 1 - For a more rapid but less accurate method of
determining twist in single spun yarns, refer to Test Method D
1422.
NOTE 2 - This test method has been evaluated for use in
determining twist in open end yarns and is not recommended.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish
appropriate safety and health practices and determine the
applicability of regulatory limitations prior to use.
Keywords:
- twist
- twist factor
- twist multiplier
- twist take-up
- yarn
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