ASTM D6717-07(2018)
(Test Method)Standard Test Method for Linear Density of Elastomeric Yarns (Skein Specimens)
Standard Test Method for Linear Density of Elastomeric Yarns (Skein Specimens)
SIGNIFICANCE AND USE
5.1 This test method is considered satisfactory for acceptance testing of commercial shipments because current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing.
5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use samples for such comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing, and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
5.2 Linear density of elastomeric yarns is used in some calculations for tensile and elastic properties.
5.3 The test method is based on elastomeric yarns in the as-produced condition, but may be used for treated elastomeric yarns provided the treatment is specified. The method does not cover the removal of finish for the determination of linear density of “finish-free” elastomeric yarns.
SCOPE
1.1 This test method covers the determination of the linear density of “as produced” elastomeric yarns made from rubber, spandex or other elastomers using a skein.
Note 1: For the determination of linear density of elastomeric yarns using short length specimens, refer to Test Method D2591.
1.2 The method is not applicable to covered, wrapped, or core-spun yarns, or yarns spun from elastomeric staple, or elastomeric yarns removed from fabrics.
1.3 This test method is applicable to elastomeric yarns having a range of 40 to 3200 dtex (36 to 2900 denier).
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6717 − 07 (Reapproved 2018)
Standard Test Method for
Linear Density of Elastomeric Yarns (Skein Specimens)
This standard is issued under the fixed designation D6717; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D4849 Terminology Related to Yarns and Fibers
1.1 This test method covers the determination of the linear
3. Terminology
density of “as produced” elastomeric yarns made from rubber,
spandex or other elastomers using a skein.
3.1 For all terminology relating to D13.58, Yarns and
Fibers, refer to Terminology D4849.
NOTE 1—For the determination of linear density of elastomeric yarns
3.1.1 The following terms are relevant to this standard:
using short length specimens, refer to Test Method D2591.
denier, elastomeric yarn, linear density, tex.
1.2 The method is not applicable to covered, wrapped, or
3.2 For all other terminology related to textiles, refer to
core-spun yarns, or yarns spun from elastomeric staple, or
Terminology D123.
elastomeric yarns removed from fabrics.
1.3 This test method is applicable to elastomeric yarns
4. Summary of Test Method
having a range of 40 to 3200 dtex (36 to 2900 denier).
4.1 Aspecimen of specified length is wound into skein form
1.4 The values stated in SI units are to be regarded as the
on a reel.The skein is cut, removed from the reel and weighed.
standard. The values given in parentheses are for information
Linear density is calculated using the mass of the skein and the
only.
length of yarn.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This test method is considered satisfactory for accep-
priate safety, health, and environmental practices and deter-
tance testing of commercial shipments because current esti-
mine the applicability of regulatory limitations prior to use.
mates of between-laboratory precision are acceptable and the
1.6 This international standard was developed in accor-
method is used extensively in the trade for acceptance testing.
dance with internationally recognized principles on standard-
5.1.1 If there are differences of practical significance be-
ization established in the Decision on Principles for the
tween reported test results for two laboratories (or more),
Development of International Standards, Guides and Recom-
comparative tests should be performed to determine if there is
mendations issued by the World Trade Organization Technical
a statistical bias between them, using competent statistical
Barriers to Trade (TBT) Committee.
assistance. As a minimum, use samples for such comparative
teststhatareashomogeneousaspossible,drawnfromthesame
2. Referenced Documents
lot of material as the samples that resulted in disparate results
2.1 ASTM Standards:
during initial testing, and randomly assigned in equal numbers
D123 Terminology Relating to Textiles
to each laboratory. The test results from the laboratories
D1776 Practice for Conditioning and Testing Textiles
involved should be compared using a statistical test for
D2258 Practice for Sampling Yarn for Testing
unpaired data, at a probability level chosen prior to the testing
D2591 Test Method for Linear Density of ElastomericYarns
series. If bias is found, either its cause must be found and
(Short Length Specimens)
corrected, or future test results for that material must be
adjusted in consideration of the known bias.
5.2 Linear density of elastomeric yarns is used in some
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.
calculations for tensile and elastic properties.
Current edition approved July 1, 2018. Published August 2018. Originally
5.3 The test method is based on elastomeric yarns in the
approved in 2001. Last previous edition approved in 2012 as D6717 – 07(2012).
DOI: 10.1520/D6717-07R18.
as-produced condition, but may be used for treated elastomeric
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
yarns provided the treatment is specified. The method does not
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cover the removal of finish for the determination of linear
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. density of “finish-free” elastomeric yarns.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6717 − 07 (2018)
TABLE 1 Suggested Skein Revolutions
6. Apparatus
3 Number of
6.1 Reel , 1.125-m (1.230-yd) circumference, with multiple Linear Density
A
Revolutions
positions for making several skeins at one time, guides that
dtex denier
apply minimal friction to the running yarn, and with vertical-
11 10 1600
mount creel, with automatic counter to set and count the
44 40 400
77 70 250
number of revolutions. The operating speed may be from 25 to
155 140 110
40 rpm; however, 30 rpm is preferred.
310 280 65
465 420 40
6.2 Measuring Tape, 6-mm (0.25-in.) wide, steel, accurate
930 840 25
to 1 mm (0.05 in.), to verify the reel circumference.
1865 1680 16
2490 2240 8
6.3 Pads, sheepskin, to prevent yarn from sloughing off the
A
The number of revolutions in a skein should give a mass between 2 and 3 g;
bottom of the package during reeling.
however, skeins weighing as low as 1 g may be used, for yarns in the lower linear
density ranges.
6.4 Balance, with an accuracy of 60.1 % of the expected
mass of the specimens. Balance pan should be protected from
drafts.
9.2 Make one wrap of the measuring tape around the reel
7. Sampling, Test Specimens, and Test Units
and apply tension to the tape by attaching an 0.5 kg (1.0 lb)
weight to the end. Read the circumference directly from the
7.1 LotSample—Asalotsampleforacceptancetesting,take
tape to the nearest mm (0.05 in.).
a random number of shipping units directed in an applicable
material specification or other agreement between the pur-
9.3 If the circumference at any of the three areas is outside
chaser and the supplier, such as an agreement to use Practice the limits of 65 mm (0. 2 in.)., adjust the reel as directed in the
D2258. Consider shipping cases or other shipping units to be
manufacturer’s directions to bring the measurement within
the primary sampling units. limits.
NOTE 2—An adequate specification or other agreement between the
10. Procedure
purchaser and the supplier requires taking into account the variability
between shipping units, between packages or ends within a shipping unit,
10.1 Test all specimens in the standard atmosphere for
and between specimens from a single package to provide a sampling with
testing textiles.
a meaningful producer’s risk, consumer’s risk, acceptable quality level
and limiting quality level. 10.2 Position the r
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