Standard Test Method for Thermal Shrinkage Force of Yarn and Cord With a Thermal Shrinkage Force Tester

SCOPE
1.1 This test method covers preparation and procedures to measure the thermal shrinkage force of yarns and cords in air.
1.2 This test method is applicable to measurement of the thermal shrinkage force of yarns and cords whose shrinkage force at 180 ± 2°C (355 ± 4°F) in air does not exceed 20 N (4 lbf). This test method is applicable to nylon, polyester, and aramid yarns and cords within the applicable range of thermal shrinkage force, as well as to comparable yarns and cords from other polymers.
1.2.1 Test specimens may be taken from yarn or cord packages, or retrieved from fabrics.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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. Specific hazards statements are given in Section 8.

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Publication Date
09-Apr-2002
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ASTM D5591-02 - Standard Test Method for Thermal Shrinkage Force of Yarn and Cord With a Thermal Shrinkage Force Tester
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 5591 – 02
Standard Test Method for
Thermal Shrinkage Force of Yarn and Cord With a Thermal
1
Shrinkage Force Tester
This standard is issued under the fixed designation D 5591; 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.
1. Scope 4. Summary of Test Method
4.1 A specified length of yarn or cord is conditioned in a
1.1 This test method covers preparation and procedures to
measure the thermal shrinkage force of yarns and cords in air. relaxed state, mounted with a pretension of 5 6 1 mN/tex (0.05
1.2 This test method is applicable to measurement of the 6 0.01 gf/den), then exposed to dry heat at a temperature of
thermal shrinkage force of yarns and cords whose shrinkage 180 6 2°C (355 6 4°F) for 120 6 5s.
force at 180 6 2°C (355 6 4°F) in air does not exceed 20 N 4.2 The shrinkage force induced in the specimen is read
(4 lbf). This test method is applicable to nylon, polyester, and from the tester.
aramid yarns and cords within the applicable range of thermal
5. Significance and Use
shrinkage force, as well as to comparable yarns and cords from
other polymers. 5.1 This test method may be used for the acceptance testing
of commercial shipments of yarns and cords.
1.2.1 Test specimens may be taken from yarn or cord
packages, or retrieved from fabrics. 5.1.1 If there are differences of practical significance be-
tween reported test results for two laboratories (or more),
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information comparative tests should be performed to determine if there is
a statistical bias between them, using competent statistical
only.
1.4 This standard does not purport to address all of the assistance. As a minimum, test samples should be used that are
as homogeneous as possible, that are drawn from the material
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- from which the disparate test results were obtained, and that
are randomly assigned in equal numbers to each laboratory for
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Specific hazards testing. Other materials with established test values may be
used for this purpose. The test results from the two laboratories
statements are given in Section 8.
should be compared using a statistical test for unpaired data, at
2. Referenced Documents
a probability level chosen prior to the testing series. If a bias is
2.1 ASTM Standards: found, either its cause must be found and corrected, or future
2
D 123 Terminology Relating to Textiles test results for that material must be adjusted in consideration
D 885 Methods for Tire Cords, Tire Cord Fabrics, and of the known bias.
Industrial Filament Yarns Made from Manufactured 5.2 Experience shows that yarns or cords on would pack-
2
Organic-Base Fibers ages, usually being under tension, exhibit a contraction in
2
D 2258 Practice for Sampling Yarn for Testing length (and a resulting increase in linear density) when
3
D 6477 Terminology Relating to Tire Cord and Fabrics removed from the package and allowed to relax over a period
of time at room temperature. Consequently, it they are tested
3. Terminology
without being allowed to relax, they will register higher
3.1 Definitions:
thermal shrinkage force values as the relaxation shrinkage will
3.1.1 For definitions of terms relating to tire cord and be incorrectly included as the thermal shrinkage force.
fabrics, refer to Terminology D 6477.
5.2.1 Retractive forces vary widely by polymer type, being
3.2 For definitions of textile terms used in this test method, almost nil within aramids and significant within most nylons.
refer to Terminology D 123.
For example, the exposure of untensioned skeins of nylon yarn
or cord to 95 to 100 % relative humidity at room temperature
for two days and reconditioning under standard laboratory
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles
conditions will cause most of the length change that is possible
and is the direct responsibility of Subcommittee D13.19 on Tire Cord and Fabrics.
Current edition approved April 10, 2002. Published June 2002. Originally at room temperature to occur within a sample. This reduction
published as D 5591 – 95. Last previous edition D 5591 – 98a.
in length is accompanied by some lowering of thermal shrink-
2
Annual Book of ASTM Standards, Vol 07.01.
age force.
3
Annual Book of ASTM Standards, Vol 07.02.
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