ASTM D6614-07(2011)
(Test Method)Standard Test Method for Stretch Properties of Textile Fabrics - CRE Method
Standard Test Method for Stretch Properties of Textile Fabrics - CRE Method
SIGNIFICANCE AND USE
This method is used to determine the stretch and growth properties which a garment made of the fabric may be expected to exhibit during use.
This is a new method and therefore the history of data is very small, however the excellent agreement of between-laboratory data suggest this method may be considered for acceptance testing of commercial shipments.
If there are differences of practical significance between reported test results for two laboratories (or more), comparative test should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, samples used for such comparative tests should be 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. Other fabrics with established test values may also be used for these comparative tests. 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 must be adjusted in consideration of the known bias.
SCOPE
1.1 This test method covers the determination of the amount of fabric stretch and fabric growth after a specified extension and held for a specified time.
1.2 While this method can be used for any fabric, knit fabrics having high stretch are better measured by test method D2594.
1.3 This test method should not be used to measure the breaking strength and elongation of woven fabrics, which is covered in Test Methods D5034 and D5035.
1.4 The values listed in either SI units 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 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.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6614 − 07(Reapproved 2011)
Standard Test Method for
Stretch Properties of Textile Fabrics – CRE Method
This standard is issued under the fixed designation D6614; 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 D5034 TestMethodforBreakingStrengthandElongationof
Textile Fabrics (Grab Test)
1.1 Thistestmethodcoversthedeterminationoftheamount
D5035 Test Method for Breaking Force and Elongation of
of fabric stretch and fabric growth after a specified extension
Textile Fabrics (Strip Method)
and held for a specified time.
1.2 While this method can be used for any fabric, knit 3. Terminology
fabrics having high stretch are better measured by test method
3.1 For all terminology relating to D13.59, Fabric Test
D2594.
Methods, General, see Terminology D4850.
1.3 This test method should not be used to measure the
3.2 For all terminology related to D13.58, Yarns and Fiber,
breaking strength and elongation of woven fabrics, which is
see Terminology D4849.
covered in Test Methods D5034 and D5035.
3.2.1 The following terms are relevant to this standard:
1.4 The values listed in either SI units or inch-pound units fabric stretch, fabric growth, stretch yarn.
are to be regarded separately as the standard. Within the text,
3.3 FordefinitionsofallothertextiletermsseeTerminology
the inch-pound units are shown in parentheses. The values
D123.
stated in each system are not exact equivalents; therefore, each
system shall be used independently of the other. Combining
4. Summary of Test Method
values from the two systems may result in nonconformance
4.1 Fabric Stretch and Fabric Growth—Aspecified load is
with specification.
applied to a fabric specimen, using a constant rate of extension
1.5 This standard does not purport to address all of the
tensile tester at a prescribed rate of extension.After holding at
safety concerns, if any, associated with its use. It is the
the specified load for a predetermined time, the length is
responsibility of the user of this standard to establish appro-
measured.The load is removed from the specimen and allowed
priate safety and health practices and determine the applica-
to relax for a specified time. A small amount of force, enough
bility of regulatory limitations prior to use.
to remove any wrinkles or folds, is applied and the specimen
length measured. The amount of fabric stretch is calculated
2. Referenced Documents
from the difference in length prior to load and under load.
Fabric growth is calculated from the difference in length prior
2.1 ASTM Standards:
to loading and after relaxation.
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
5. Significance and Use
D2594 Test Method for Stretch Properties of Knitted Fabrics
Having Low Power 5.1 This method is used to determine the stretch and growth
propertieswhichagarmentmadeofthefabricmaybeexpected
D4849 Terminology Related to Yarns and Fibers
D4850 Terminology Relating to Fabrics and Fabric Test to exhibit during use.
Methods
5.2 This is a new method and therefore the history of data is
very small, however the excellent agreement of between-
laboratory data suggest this method may be considered for
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
acceptance testing of commercial shipments.
and is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,
5.2.1 If there are differences of practical significance be-
General.
tween reported test results for two laboratories (or more),
CurrenteditionapprovedMay1,2011.PublishedJuly2011.Originallyapproved
comparative test should be performed to determine if there is a
in 2000. Last previous edition approved in 2007 as D6614–07. DOI: 10.1520/
D6614-07R11.
statistical bias between them, using competent statistical assis-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
tance.As a minimum, samples used for such comparative tests
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
should be as homogeneous as possible, drawn from the same
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. lot of material as the samples that resulted in disparate results
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6614 − 07 (2011)
during initial testing, and randomly assigned in equal numbers 7.4.1 For woven fabrics, cut two strips 65 by 350 mm (2.5
to each laboratory. Other fabrics with established test values by 14 in.) with the long dimension parallel to the stretch
may also be used for these comparative tests. The test results direction.
from the laboratories involved should be compared using a 7.4.1.1 Ravel the strips to form test specimens to 50 6 0.5
statistical test for unpaired data, at a probability level chosen mm (2 6 0.02 in.) width by taking approximately the same
prior to the testing series. If bias is found, either its cause must number of yarns from each side of the specimen.
be found and corrected, or future test results must be adjusted 7.4.2 For knitted and nonwoven fabrics, cut two test
in consideration of the known bias. specimens, 50 6 0.5 mm (2 6 0.02 in.) wide by 350 mm (14
in.) with the long dimension parallel to the stretch direction.
6. Apparatus
8. Conditioning
6.1 Tensile Testing Machine , of the CRE type with capa-
bility to maintain a constant load and measurement of the
8.1 Condition each sample as directed in Practice D1776,
location of the moveable crosshead.
prior to cutting the test specimens.
6.2 GripsandJawFaces,aminimumof50mm(2in.)faces
9. Preparation and Calibration of Test Apparatus
to hold the full width of the specimen.
9.1 Set-up procedures for machines from different manufac-
7. Sampling, Selection, and Number of Specimens
turers may vary. Prepare and verify calibration of the tensile
tester using directions supplied by the manufacturer.
7.1 Primary Sampling Unit—Consider rolls, bolts or pieces
offabric,orcartonsoffabriccomponentsoffabricatedsystems
9.2 Set the distance between the jaw faces 250 6 0.5 mm
such as garments to be the primary sampling unit, as appli-
(10 6 0.02 in.).
cable.
9.3 Select an appropriate extension speed. Fabrics with very
7.2 Laboratory Sampling Unit—As a laboratory sampling
little stretch should be extended at a slow speed and fabrics
unit take from the primary sampling unit at least one full-width
with high stretch at a faster speed. The extension speed is not
piece of fabric that is 1M (1 yd) in length along the selvage
critical to the test but consideration mu
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.