ASTM D2594-04(2008)e2
(Test Method)Standard Test Method for Stretch Properties of Knitted Fabrics Having Low Power
Standard Test Method for Stretch Properties of Knitted Fabrics Having Low Power
SIGNIFICANCE AND USE
This test method specifies test conditions for measuring the fabric growth and fabric stretch of knitted fabrics intended for use in swimwear, anchored slacks, and other form-fitting apparel (also commonly known as semi-support apparel) applications, as well as test conditions for measuring the fabric growth of knitted fabrics intended for use in sportswear and other loose-fitting apparel (also commonly known as comfort stretch apparel) applications. The applicability of this test method to the measurement of fabric growth and fabric stretch of knitted fabrics intended for use in slacks, sport coats, and suits has not been determined.
This test method is not recommended for acceptance testing of commercial shipment because the between-laboratory precision is known to be poor.
If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if their is a statistical bias between them, using competent statistical assistance. As a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results are obtained, and are assigned randomly in equal numbers to each laboratory for testing. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a 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.
SCOPE
1.1 This test method covers the measurement of fabric stretch and fabric growth of knitted fabrics intended for applications requiring low-power stretch properties.
1.2 This test method includes procedures for fabric growth and stretch and can be used individually when required by individual specifications.
1.3 This test method is not applicable to fabrics intended for support or other applications requiring high-power stretch properties.
Note 1—For information on testing high-power and woven stretch fabrics, refer to Test Methods D3107 and D6614.
1.4 The values stated in either SI or inch-pound units are to be regarded separately as the standard. Within the text, the inch-pound 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 with the specification.
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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
´2
Designation:D2594–04 (Reapproved 2008)
Standard Test Method for
Stretch Properties of Knitted Fabrics Having Low Power
This standard is issued under the fixed designation D2594; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
´ NOTE—Editorial changes were made in August 2008.
´ NOTE—In 12.2.2, 2 h recovery was corrected to 1 h editorially inApril 2011.Also, in 7.3, the course-wise dimension of 500
was corrected editorially to 398 in April 2011.
1. Scope D2904 Practice for Interlaboratory Testing of a Textile Test
Method that Produces Normally Distributed Data
1.1 This test method covers the measurement of fabric
D2906 Practice for Statements on Precision and Bias for
stretch and fabric growth of knitted fabrics intended for
Textiles
applications requiring low-power stretch properties.
D3107 Test Methods for Stretch Properties of Fabrics Wo-
1.2 This test method includes procedures for fabric growth
ven from Stretch Yarns
and stretch and can be used individually when required by
D4849 Terminology Related to Yarns and Fibers
individual specifications.
D4850 Terminology Relating to Fabrics and Fabric Test
1.3 Thistestmethodisnotapplicabletofabricsintendedfor
Methods
support or other applications requiring high-power stretch
D6614 TestMethodforStretchPropertiesofTextileFabrics
properties.
− CRE Method
NOTE 1—For information on testing high-power and woven stretch
fabrics, refer to Test Methods D3107 and D6614.
3. Terminology
1.4 The values stated in either SI or inch-pound units are to
3.1 Definitions:
be regarded separately as the standard. Within the text, the
3.1.1 Fordefinitionoftextiletermsusedinthistestmethod:
inch-pound units are shown in parentheses. The values stated
bench marks, refer to Terminology D4849.
in each system are not exact equivalents; therefore, each
3.1.2 For definitions of textile terms used in this test
system shall be used independently of the other. Combining
method: fabric growth; fabric stretch; low-power stretch and
values from the two systems may result in nonconformance
tension, refer to Terminology D4850.
with the specification.
3.1.3 For definitions of other textile terms used in this test
1.5 This standard does not purport to address all of the
method, refer to Terminology D123.
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4.1 Fabric Growth—Bench marks of a known distance are
bility of regulatory limitations prior to use. made on a fabric specimen.Aspecified tension is applied to a
fabricspecimenbyaprescribedcyclingtechnique.Thetension
2. Referenced Documents
isremovedandafterseveralspecificrecoverytimesunderzero
2.1 ASTM Standards:
tension, the distance between the bench marks is remeasured
D123 Terminology Relating to Textiles
after each time interval. The fabric growth is calculated from
D1776 Practice for Conditioning and Testing Textiles
the length difference between the bench marks prior to appli-
cation of the tension and after each respective recovery time
interval.
4.2 Fabric Stretch—Bench marks of a known distance are
ThistestmethodisunderthejurisdictionofASTMCommitteeD13onTextiles
made on a fabric specimen.Aspecified tension is applied to a
and is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,
General. fabric specimen by a prescribed cycling technique and the
Current edition approved July 1, 2008. Published August 2008. Originally
resulting distance between the bench marks measured. The
approvedin1969.DiscontinuedNovember1997andreinstatedasD2594–99.Last
fabric stretch is calculated from the length difference between
previouseditionapprovedin2004asD2594–04.DOI:10.1520/D2594-04R08E02.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Withdrawn. The last approved version of this historical standard is referenced
the ASTM website. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
´2
D2594–04 (2008)
the bench marks prior to application of the tension and under 6.2 Hanger Assembly , consisting of hangers, hanger rods,
while under the tension. and chain.
6.3 Lightweight Rule , fitted with a pin hook at the zero
5. Significance and Use
point of the scale for attachment to the specimen, graduated
either in units of percent of original gage length of 125 mm (5
5.1 This test method specifies test conditions for measuring
in.) or in units of 1 mm ( ⁄16 in.).
the fabric growth and fabric stretch of knitted fabrics intended
for use in swimwear, anchored slacks, and other form-fitting 6.4 Tensiometer or Weights , that can be attached to the
apparel (also commonly known as semi-support apparel) bottom hanger of the hanger assembly, capable of providing
applications,aswellastestconditionsformeasuringthefabric total tensions of 2.27 kgf (5 lbf) and 4.54 kgf (10 lbf) to the
growth of knitted fabrics intended for use in sportswear and specimen, 61%.
other loose-fitting apparel (also commonly known as comfort
6.5 Turnbuckle , or equivalent, having a length of 25 to 75
stretch apparel) applications. The applicability of this test
mm (1 to 3 in.).
method to the measurement of fabric growth and fabric stretch
6.6 Sanforized Marker, to establish bench marks on the
of knitted fabrics intended for use in slacks, sport coats, and
specimen.
suits has not been determined.
6.7 Timer, with increments of at least 1 min.
5.2 This test method is not recommended for acceptance
testing of commercial shipment because the between-
7. Sampling and Test Specs
laboratory precision is known to be poor.
7.1 Primary Sampling Unit—Consider rolls of fabric or
5.2.1 If there are differences of practical significance be-
fabric components of fabricated systems to be the primary
tween reported test results for two laboratories (or more),
sampling unit, as applicable.
comparative tests should be performed to determine if their is
7.2 Laboratory Sampling Unit—As a laboratory sampling
a statistical bias between them, using competent statistical
unit take from rolls at least one full-width piece of fabric that
assistance. As a minimum, ensure the test samples to be used
is2m(2yd)in length along the selvage (machine direction),
are as homogeneous as possible, are drawn from the material
after removing a first 1 mm (1 yd) length. For fabric compo-
from which the disparate test results are obtained, and are
nents of fabricated systems use the entire system.
assigned randomly in equal numbers to each laboratory for
7.3 Test Specimens—From each laboratory sampling unit,
testing. The test results from the two laboratories should be
cut 5 wale-wise (lengthwise) and 5 course-wise (widthwise)
compared using a statistical test for unpaired data, at a
test specimens 125 63mm(5 6 0.1 in.) by 398 6 10 mm
probability level chosen prior to the testing series. If a bias is
(15.5 6 0.3 in.). Cut the long dimension of the wale-wise
found, either its cause must be found and corrected, or future
specimens parallel to the wale direction and the course-wise
test results for that material must be adjusted in consideration
specimens parallel to the course direction. Take specimens
of the known bias.
representing a broad distribution from different positions
diagonally across the width of the laboratory sampling unit.
6. Apparatus
Consider the long direction as the direction of test. Label to
6.1 Frame , suitable for supporting the hanger assembly
maintain specimen identity.
illustrated in Fig. 1 and tension forces applied during testing.
7.3.1 For fabric widths 125 mm (5 in.) or more, take no
specimen closer than 25 mm (1 in.) from the edges of the
laboratory sampling unit.
7.3.2 For fabric widths less than 125 mm (5 in.), use the
For additional information on obtaining apparatus, equipment, or supplies that
may be suitable for use in this standard, please visit the ASTM Manufacturers’
entire width of the laboratory sampling unit for specimens.
Equipment Directory at www.astm.org.
FIG. 1 Hanger Assembly
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
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D2594–04 (2008)
7.3.3 Ensure specimens are free of folds, creases, or 10.3.8 After 2 h 6 5 min, unlock and release the chain and
wrinkles. Avoid getting oil, water, grease, etc., on the speci- remove the lower hanger from the specimen loop.
mens when handling.
10.3.9 Measure the position of the lower bench mark
7.3.4 If the fabric has a pattern, ensure that the specimens relative to the scale on the rule to the nearest 1% of original
are a representative sampling of the pattern.
gage length or 1 mm ( ⁄16 in.) after recovery under no tension
7.3.5 After cutting, fold each specimen in half lengthwise as follows:
forming a loop and sew the edges opposite the fold together 6
10.3.9.1 After60 65sandrecordasmeasurement(B),and
to 13 mm (0.25 to 0.50 in.) from the cut edges and parallel to
10.3.9.2 After 1 h 6 5 min record as measurement (C).
the short direction of the specimen.
10.3.10 Remove the tested specimens, in turn, and continue
7.3.6 Lay the specimen on a flat surface and place bench
as directed in 10.3 until three specimens for each the wale and
marks 125 63mm(5 6 0.01 in.) apart on the central section
coursedirectionshavebeentestedforeachlaboratorysampling
of one face of the looped specimen establishing a gage length
unit.
along the length of the specimen. Record as measurement (A).
10.4 Fabric Stretch:
10.4.1 Place a new specimen in the stretch testing
...
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