ASTM D6587-00(2006)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
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Designation:D6587–00 (Reapproved 2006)
Standard Test Method for
Yarn Number Using Automatic Tester
This standard is issued under the fixed designation D6587; 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.
´ NOTE—Section 3 was updated editorially in August 2006.
1. Scope 3. Terminology
1.1 This test method covers the measurement of yarn 3.1 For all terminology relating to D13.58, Yarns and
number of filament and spun yarns using automated testers. Fibers, refer to Terminology D4849.
Someoftheinstrumentsarestand-aloneandothersareoptional 3.1.1 The following terms are relevant to this standard:
modules for instruments that perform additional tests. cotton count, denier, linear density, tex, yarn number, yarn
1.1.1 The instruments are capable of measuring yarn num- numbering system.
bers up to 4000 dtex (3600 denier). 3.2 For all other textile terms used in this test method, see
Terminology D123.
NOTE 1—For determination of yarn number by use of reel and balance,
refer to Test Method D1907.
4. Summary of Test Method
1.2 The values stated in either SI units or inch-pound units
4.1 A specified length of yarn (specimen) is automatically
are to be regarded separately as standard. Within the text, the
stripped directly from the package, cut, and weighed. The yarn
inch-pound units are in parentheses. The values stated in each
number is calculated by an interfaced computer, displayed on a
system are not exact equivalents; therefore, each system shall
monitor, and may be printed.The yarn number can be reported
be used independently of the other. Combining values from the
in tex, denier, or cotton count units.
two systems may result in inaccuracies of results.
1.3 This standard does not purport to address all of the
5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 This test method for yarn number is satisfactory for
responsibility of the user of this standard to establish appro-
acceptance of commercial shipments and is used in the trade.
priate safety and health practices and determine the applica-
5.1.1 In case of a dispute arising from differences in
bility of regulatory limitations prior to use.
reported test results when using this Test Method for accep-
tance testing of commercial shipments, the purchaser and the
2. Referenced Documents
supplier should either use the referee Test Method D1907 for
2.1 ASTM Standards:
yarn number or conduct comparative tests to determine if there
D123 Terminology Relating to Textiles
is a statistical bias between their laboratories. Competent
D1776 Practice for Conditioning and Testing Textiles
statistical assistance is recommended for the investigation of
D1907 Test Method for Linear Density of Yarn (Yarn
bias.As a minimum, the two parties should take a group of test
Number) by the Skein Method
specimens that are as homogeneous as possible and that are
D2258 Practice for Sampling Yarn for Testing
from a lot of material of the type in question. The test
D4849 Terminology Related to Yarns and Fibers
specimens should then be randomly assigned in equal numbers
to each laboratory for testing.The average results from the two
laboratories should be compared using appropriate statistical
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
analysis and a probability level chosen by the two parties
and is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.
before the testing is begun. If a bias is found, either its cause
Current edition approved June 1, 2006. Published August 2006. Originally
must be found and corrected or the purchaser and the supplier
approved in 2000. Last previous edition approved in 2000 as D6587–00. DOI:
10.1520/D6587-00R06E01.
must agree to interpret future test results with consideration to
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the known bias.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.2 This test method is also used for the quality control for
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. both filament and spun yarns.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D6587–00 (2006)
6. Apparatus D2258. Preferably, the same number of packages should be
taken from each shipping unit in the lot sample. If differing
6.1 Automatic Yarn Numbering Instrument, with interfaced
numbers of packages are to be taken from shipping units in the
computer.
lot sample, determine at random which shipping units are to
6.1.1 ACW (Automatic Cut and Weigh) Yarn Tester, Series
have each number of packages drawn.
T for textile yarns, Series BCF for bulked continuous filament
7.3 Test Specimen—Test one specimen from each package
(BCF) carpet yarns, and Series I for industrial yarns. See Fig.
of filament yarn and five specimens from each package of spun
1. The different series testers have different systems for
yarn. See Table 1 for the length of yarn in a specimen.
tensioning yarns and different yarn running speeds.
6.1.2 Autocount C —See Fig. 2.
8. Conditioning
6.1.3 Autocount TTA —See Fig. 3.
6.1.4 Yarn Count Analyzer (YCA) —See Fig. 4.
8.1 Condition the packages in the standard atmosphere for
6.2 Calibration Weights—Two grams and others as needed
testing textiles, which is 21 6 1°C (70 6 2°F) and 65 62%
to cover the dtex (denier) ranges of interest.
relative humidity, for not less than 4 h. See Practice D1776.
7. Sampling
9. Preparation and Calibration of Apparatus
7.1 Lot Sample—As a lot sample for acceptance testing,
9.1 Set up and calibrate the tester using the manufacturer’s
take at random the number of shipping units directed in an
manual and the appropriate appendix of this test method.
applicable material specification or other agreement between
the purchaser and the supplier, such as an agreement to use
10. Procedure
Practice D2258. Consider shipping cases or other shipping
10.1 Check each package for cleanliness, overthrown ends,
units to be the primary sampling units.
and any package formation which might interfere with the
NOTE 2—An adequate specification or other agreement between the
free-running of the yarn from the package.
purchaser and the supplier requires taking into account the variability
10.2 Position packages to be tested with the thread line
between shipping units, between packages or ends within a shipping unit,
passing in a straight line from the package to the inlet tube
and between specimens from a single package to provide a sampling plan
without snags or additional tension added. Packages may be
with a meaningful producer’s risk, consumer’s risk, acceptable quality
beneathorabovetheinletjetortube,aspositiondoesnotaffect
level, and limiting quality level.
the results.
7.2 Laboratory Sample—As a laboratory sample for accep-
10.2.1 If the instrument uses a package changer, place the
tance testing, take at random from each shipping unit in the lot
packageinacreelandstringuptheyarninamannertoprevent
sample the number of packages directed in an applicable
snagging or tangling of the ends and excessive tension on the
material specification or other agreement between the pur-
yarn.
chaser and the supplier such as an agreement to use Practice
10.2.2 Prestripping packages is not necessary because the
instruments can be set to prestrip for a specified time before
testing.
Available from W. Fritz Mezger, Inc., 155 Hall St., Spartanburg, SC 29302-
10.3 String up the yarns, input sample, and specimen
1523 and Lenzing Technik GrmbH & Co KG, 4860 Lenzing, Austria.
Available from Lawson Hemphill Sales, PO Drawer 6388, Spartanburg, SC information and test the specimens as directed in the manufac-
29304 and Textechno, Dohrweg 65, D41066, Monchengladbach, Germany.
turer’s manual. See the appendixes for general information
Available from Lawson Hemphill Sales, P.O. Drawer 6388, Spartanburg, SC
specific to the instrument.
29304.
FIG. 1 Yarn String-up Diagram for ACW (Automatic-Cut-and-Weigh) Tester
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D6587–00 (2006)
FIG. 2 Yarn String-up Diagram for Autocount C
N 5 K 3 L/M (2)
11. Calculation
11.1 Direct Yarn Numbering Systems:
N 5 5905.41/T (3)
11.1.1 The calculation for yarn number as dtex (denier) is
based on Eq 1.
N 5 5314.87/D (4)
N 5 K 3 M/L (1)
where:
where:
N = cotton count,
N = yarn number, dtex (denier),
K = constant for cotton yarn number 0.590541,
K = constant depending on
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