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ASTM D 1907 Document Information:
Title
Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
ASTM International
Publication Date:
Jan 1, 2007
Scope:
This test method covers the determination of the linear density
of all types of yarn in package form, subject to the limitations of
size and stretch given in 1.2 and 1.3. Provision is made for
expressing yarn linear density in all the traditional yarn
numbering systems.
This method is applicable to yarns that stretch less than 5 %
when tension on the yarn is increased from 0.25 to 0.75 cN/tex
(0.25 to 0.75 gf/tex). By mutual agreement, and use of a lower than
specified reeling tension, this method may also be adapted to
measure the linear density of yarns that stretch more than 5 %,
under the above force.
This method is applicable to yarns finer than 2000 tex. However,
it may be also adapted to coarser yarns by the use of skeins of
shorter than specified lengths, and alternate reeling conditions,
agreeable to the interested parties.
Depending on the procedure used to calculate the moisture
content of the yarn being tested, and its actual moisture content,
or finish content, or both, one or more of the following options
may be utilized.
Unscoured Yarn:
Option 1—Yarn at equilibrium with the standard
atmosphere for testing textiles.
Option 2—Oven-dried yarn.
Option 3—Oven-dried yarn, plus commercial moisture
regain.
Scoured Yarn:
Option 4—Scoured yarn at equilibrium with the standard
atmosphere for testing textiles.
Option 5—Oven-dried, scoured yarn.
Option 6—Oven-dried, scoured yarn, plus commercial
moisture regain.
Option 7—Oven-dried, scoured yarn, plus commercial
allowance (commercial moisture regain, plus an allowance for
finish).
Specimens used to determine yarn linear density may also be used
to determine the skein breaking strength of the yarn. Hence, this
method provides the sequence of steps to be followed, to determine
both these yarn properties.
NOTE 1—The linear density of yarns produced with jute, or glass,
may also be determined by the following approved methods:
Specifications D 541, D 578, and D 681. The linear density of short
yarn segments, raveled from fabrics, may be determined by Test
Method D 1059.
The values stated in SI units are to be regarded as standard.
The values shown in parentheses are approximate conversions to U.S.
customary unit equivalents.
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:
- yarn linear density
- yarn number
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