ASTM D1907-01
(Test Method)Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
SCOPE
1.1 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.
1.2 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.
1.3 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.
1.4 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.
1.4.1 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.
1.4.2 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).
1.5 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.
1.6 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.
1.7 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.
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Designation:D1907–01
Standard Test Method for
1
Linear Density of Yarn (Yarn Number) by the Skein Method
This standard is issued under the fixed designation D 1907; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
NOTE 1—The linear density of yarns produced with jute, or glass, may
1. Scope
also be determined by the following approved methods: Specifications
1.1 This test method covers the determination of the linear
D 541, D 578, and D 681. The linear density of short yarn segments,
density of all types of yarn in package form, subject to the
raveled from fabrics, may be determined by Test Method D 1059.
limitations of size and stretch given in 1.2 and 1.3. Provision is
1.6 The values stated in SI units are to be regarded as
made for expressing yarn linear density in all the traditional
standard. The values shown in parentheses are approximate
yarn numbering systems.
conversions to U.S. customary unit equivalents.
1.2 This method is applicable to yarns that stretch less than
1.7 This standard does not purport to address all of the
5 % when tension on the yarn is increased from 0.25 to 0.75
safety concerns, if any, associated with its use. It is the
cN/tex (0.25 to 0.75 gf/tex). By mutual agreement, and use of
responsibility of the user of this standard to establish appro-
a lower than specified reeling tension, this method may also be
priate safety and health practices and determine the applica-
adaptedtomeasurethelineardensityofyarnsthatstretchmore
bility of regulatory limitations prior to use.
than 5 %, under the above force.
1.3 This method is applicable to yarns finer than 2000 tex.
2. Referenced Documents
However, it may be also adapted to coarser yarns by the use of
2.1 ASTM Standards:
skeins of shorter than specified lengths, and alternate reeling
2
D 123 Terminology Relating to Textiles
conditions, agreeable to the interested parties.
2
D 541 Specification for Single Jute Yarn
1.4 Depending on the procedure used to calculate the
2
D 578 Specification for Glass Fiber Strands
moisture content of the yarn being tested, and its actual
D 681 Specification for Jute Rove and Plied Yarn for
moisture content, or finish content, or both, one or more of the
2
Electrical and Packing Purposes
following options may be utilized.
D 1059 Test Method for Yarn Number Based on Short-
1.4.1 Unscoured Yarn:
2
Length Specimens
Option 1—Yarn at equilibrium with the standard atmosphere
D 1578 Test Method for Breaking Strength ofYarn in Skein
for testing textiles.
2
Form
Option 2—Oven-dried yarn.
2
D 1776 Practice for Conditioning Testing Textiles
Option 3—Oven-dried yarn, plus commercial moisture re-
D 1909 Table of Commercial Moisture Regains for Textile
gain.
2
Fibers
1.4.2 Scoured Yarn:
2
D 2257 Test Method for Extractable Matter in Textiles
Option 4—Scoured yarn at equilibrium with the standard
D 2260 Standard Tables of Conversion Factors and Equiva-
atmosphere for testing textiles.
lent Yarn Numbers Measured in Various Numbering Sys-
Option 5—Oven-dried, scoured yarn.
2
tems
Option 6—Oven-dried,scouredyarn,pluscommercialmois-
2
D 2258 Practice for Sampling Yarn for Testing
ture regain.
D 2494 TestMethodforCommercialMassofaShipmentof
Option 7—Oven-dried, scoured yarn, plus commercial al-
2
Yarn or Man-Made Staple Fiber or Tow
lowance (commercial moisture regain, plus an allowance for
3
2.2 ISO Standards:
finish).
2060 Textiles—Yarn from Packages—Determination of lin-
1.5 Specimens used to determine yarn linear density may
ear density (mass per unit length) by the skein method.
also be used to determine the skein breaking strength of the
yarn. Hence, this method provides the sequence of steps to be
3. Terminology
followed, to determine both these yarn properties.
3.1 Definitions:
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextiles,
and is the direct responsibility of Subcommittee D13.58 on Yarn Test Methods,
2
General. Annual Book of ASTM Standards, Vol. 07.01.
3
Current edition approved September 10, 2001. Published November 2001. Available from American National Standards Institute, 11 West 42nd Street,
Originally published as D 1907 – 61 T. Last previous edition D 1907 – 97. 13th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1907
3.1.1 commercial allowance, (CA), n—an arbitrary value, 5. Significance and Use
equal to the commercial moisture regain, plus a specific
5.1 Test Method D 1907 is considered satisfactory for
allowance for finish, used with th
...
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