ASTM D3108/D3108M-13(2020)

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: D3108/D3108M − 13 (Reapproved 2020)
Standard Test Method for
Coefficient of Friction, Yarn to Solid Material
This standard is issued under the fixed designation D3108/D3108M; 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 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This test method covers the measurement of the kinetic
responsibility of the user of this standard to establish appro-
frictional properties of a moving yarn in contact with a solid
priate safety, health, and environmental practices and deter-
material.
mine the applicability of regulatory limitations prior to us-
NOTE 1—For determining yarn-to-yarn friction, refer to Test Method
e.Specific precautionary statements are given in Section 7.
D3412.
1.8 This international standard was developed in accor-
1.2 Thistestmethodspecifiesarelativespeedof100m/min.
dance with internationally recognized principles on standard-
The test method may be used at other speeds, although with a
ization established in the Decision on Principles for the
possible change in precision and coefficient of friction.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
1.3 This test method covers the measurement of the coeffi-
Barriers to Trade (TBT) Committee.
cient of kinetic friction between yarn and solid surface or
surfaces of constant radius in the contact area. If a yarn of
2. Referenced Documents
uniform value is used, comparisons of frictional properties of
different solid materials can be made with relation to that yarn. 2.1 ASTM Standards:
If a given solid material is used, comparisons of frictional D123 Terminology Relating to Textiles
properties of different yarns, or yarns with different finishes, D1776 Practice for Conditioning and Testing Textiles
can be made with relation to that particular solid material. D1907 Test Method for Linear Density of Yarn (Yarn Num-
ber) by the Skein Method
1.4 This test method specifically recommends wrap angles
D2258 Practice for Sampling Yarn for Testing
of 1.57, 3.14 and 6.28 radian (90, 180 and 360°), but other
D3412 Test Method for Coefficient of Friction, Yarn to Yarn
wrap angles may be used, again with a possible change in
D4849 Terminology Related to Yarns and Fibers
precision and level. The angle of wrap should not be so great,
especially for yarns having high coefficients of friction, that it
3. Terminology
causes the output tension to exceed the yield value for the yarn
3.1 For all terminology relating to D13.58, Yarns and
being tested. Also, in every case the angle of wrap should not
Fibers, refer to Terminology D4849.
be less than 1.57 rad (90°).
3.1.1 The following terms are relevant to this standard:
1.5 This test method has been applied to yarns having linear
coefficient of friction, friction, kinetic friction, radian, static
densitiesrangingbetween1.5and400tex[14and3600denier]
fraction, wrap angle.
and having coefficients of friction ranging between 0.1 and 1.0
3.2 For all other terminology related to textiles, refer to
but may also be used with yarns outside these ranges of linear
Terminology D123.
densities and coefficients of friction.
1.6 The values stated in either SI units or inch-pound units
4. Summary of Test Method
are to be regarded separately as standard. The values stated in
4.1 A length of yarn is run at known speeds and in contact
each system are not necessarily exact equivalents; therefore, to
with either single or multiple friction surfaces using a specified
ensure conformance with the standard, each system shall be
wrapangle.(SeeFig.1.)Theyarninputandoutputtensionsare
used independently of the other, and values from the two
measured, and the coefficient of friction is calculated by means
systems shall not be combined.
ofAmontons’law(see11.4).Alternatively,apparatusisusedin
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. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2020. Published March 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1972. Last previous edition approved in 2013 as D3108/D3108M – 13. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D3108_D3108M-13R20. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3108/D3108M − 13 (2020)
FIG. 1 Schematic Diagram of Angle of Wrap
which the ratio of output tension to input tension is measured measures the interaction between two bodies or elements such
allowing the coefficient of friction to be indicated directly. as a yarn running over a surface.
5.4 Although this method lays down standardized condi-
5. Significance and Use
tions of test, nonstandard conditions may be used for research
5.1 Test Method D3108 for the determination of kinetic
or diagnosis but should be reported as such.
friction between yarn and solid materials may be used for the
5.5 This method covers determination of the mean friction
acceptance testing of commercial shipments of yarn, but
over a specified length of yarn.
caution is advised since between laboratory precision is known
5.6 Additional information has been reported in the
to be poor. Comparative tests as directed in 5.1.1 may be
3,4,5
literature.
advisable.
5.1.1 If there are differences or practical significance be-
6. Apparatus
tween reported test results for two laboratories (or more),
6.1 Friction Testing Apparatus (Indirect) (Fig. 2)—
comparative tests should be performed to determine if there is
Apparatus in which the input tension is measured or controlled
a statistical bias between them, using competent statistical
to a set value, the output tension is measured, and the
assistance.Asaminimum,testsamplesthatareashomogenous
coefficient of friction is calculated within or outside the
as possible, drawn from the material from which the disparate
apparatus.
test results were obtained, and randomly assigned in equal
6.1.1 Yarn Tension Input Control—A means of controlling
numberstoeachlaboratoryfortesting.Thetestresultsfromthe
the yarn input tension to the nearest 61mN[60.1 gf]. A
two laboratories should be compared using a statistical test for
demand-fed apparatus with a fixed weight is suitable.
unpaired data, at a probability level chosen prior to the testing
6.1.2 Yarn Input Tension Measurement—The yarn input
series. If a bias is found, either its cause must be found and
tension is measured to within 61mN[60.1 gf] using a
corrected, or future test results for that material must be
suitable tension gage producing an electrical signal. The signal
adjusted in consideration of the known bias.
is recorded as mN [gf], or is used in combination with the yarn
5.2 The frictional properties of textile yarns and of machin-
output tension measurement to calculate the coefficient of
ery components such as yarn guides are of general interest and
friction.
have many applications. Because the frictional properties of
6.1.3 Yarn Output Tension Measurement—The yarn output
yarns will affect the performance and life of yarn guides,
tension is measured to within 61mN[60.1 gf] using a
sewing and knitting needles, and other contact surfaces, the
modifying effects of surface finishes and lubricants are of
Olsen, J. S., “Frictional Behaviour of Textile Yarns,” Textile Research Journal,
special interest. Frictional properties also affect the quality and
Vol 39, No 1, 1969, pp 31–37.
performance properties of yarns and subsequently of products
Lyne, D.G., “Dynamic Friction Between Cellulose Acetate Yarn and a Metal
made from them.As a consequence, frictional properties are of
Cylinder,” Journal of the Textile Institute, Vol 46, 1955, p 112.
interest in research, control, and product design. Rubenstein,C.,“ReviewoftheFactorsInfluencingtheFrictionofFibres,Yarns
and Fabrics,” Wear, Vol 2, 1958-59, p 296.
5.3 It is stressed that there is no coefficient of friction for a
Equipment meeting these requirements may be commercially obtained from
single body such as a yarn or a surface.Acoefficient of friction Lawson Hemphill (Sales) Inc., PO Drawer 6388, Spartanburg, SC 29304.
D3108/D3108M − 13 (2020)
FIG. 2 Schematic Diagram of Typical Yarn Friction Measuring Apparatus, Indirect Type
suitable tension gage producing an electrical signal. The signal because the absolute level of input tension can affect the
is recorded as mN [gf] or is used in combination with the yarn measured coefficient of friction for certain yarns, particularly
input tension measurement to calculate the coefficient of
low-twist yarns, the general level of input tension should be
friction. A suitable chart recorder may be used.
preset, for example with a dead weight disk tensioner.
6.2.2 Coeffıcient of Friction Indicator—The nature of this
6.2 Friction Testing Apparatus (Direct) (Fig. 3)—Apparatus
will depend on the instrument being used. Typically, a pointer
in which the ratio of output to input tensions is established
directly and the coefficient of friction indicated on a scale or or a chart recorder pen is displaced by the movement of the
components that bring the system into balance and the product
display. The comparison may be mechanical.
6.2.1 Yarn Tension Input Control—Since this type of appa- of the input tension and the distance from the axis equals the
ratus automatically derives the ratio of output-to-input-tension, product of the output tension and the distance from the axis
close control of input tension is not usually required. However, (see Fig. 3).
FIG. 3 Schematic Diagram of Typical Yarn Friction Measuring Apparatus, Direct Type
D3108/D3108M − 13 (2020)
6.3 Friction Surface, may be changeable on some equip- 9. Conditioning
ment.
9.1 Preparation of Test Packages—Remove sufficient yarn
6.3.1 Standard Friction Surface—Friction surfaces having a
from the test packages to avoid testing nonrepresentative
diameter of 0.5 in. [12.7 mm] for yarns having linear densities
layers. If in doubt, remove about 10 % of the length of yarn on
ranging from 1.5 to 80 tex, or 0.79 in. [20.0 mm] for yarns
the package.
having linear densities ranging from 80 to 400 tex, and a
9.2 The strand to be tested must have a uniform moisture
chromesurfaceof0.03to6µmroughness.Theuseofone,two,
content along its length. Atmospheric conditions must there-
or three pins in sequence has been found satisfactory although
fore be stable and the strand must be in equilibrium with the
there may be a difference in the results (theoretically only the
prevailing atmosphere. To satisfy this condition, testing should
totalangleofwrapandnotthenumberofpinsshouldaffectthe
be carried out after thorough conditioning in the standard
results). (See 12.3.4).
atmosphere for testing textiles.
6.3.2 Other Friction Surfaces—Unless the apparatus has a
friction surface that cannot be altered, friction surfaces of
9.3 Precondition and condition the specimens as directed in
different materials, sizes, and surface finish may be used but
Practice D1776.
must be specified in the report (see 12.3.4).
10. Procedure
6.4 Drive System, consisting of a controlled speed yarn
transporting device with appropriate controls to record and
10.1 Test all specimens in the standard atmosphere for
adjustthelinearorthroughputspeed.Generally,aspeedofless
testing as directed in Practice D1776.
than 400 m/min has been found preferable. The yarn transport-
10.2 Prior to each test, thoroughly clean the friction
ing device should be constructed to eliminate yarn slippage by
elements, input rolls, and any other surfaces with which the
the use of high-friction surface.
yarn comes in contact up to and including the friction element,
6.5 Cotton Yarn For Cleaning—A thoroughly scoured cot-
using one of the following:
ton yarn that is highly absorbent (see section 10.2.2 and Annex
10.2.1 A solvent which contains no trace oils, or
A1).
10.2.1.1 Warning—If solvent is used, appropriate health
andsafetyprecautionsmustbetaken.(SeeSectiononHazards)
6.6 Solvent—See 10.2.
10.2.2 A thoroughly scoured cotton yarn that is highly
absorbent used as a cleaning yarn. See Annex A1 for details.
7. Hazard
10.3 Check the surface properties of the friction elements
7.1 Refer to the manufacturer’s material safety data sheet
for wear, gouging, or channeling. Some textile yarns, specifi-
for information on storage, handling, use, and disposal of
cally glass, stainless steel, delustered yarns, and other high-
chemicals used in this test method.
modulus yarns, are known to create excessive wear on most
guide surface materials, including chromium. Check for evi-
8. Sampling
dence of surface wear periodically by the use of control yarns,
8.1 Lot Sample—Asalotsampleforacceptancetesting,take
microscopic examination, or other forms of examining or
at random the number of shipping units directed in an
measuring surface uniformity. Replace or refurbish friction
applicable material specification or other agreement between
elements which show signs of wear, gouging, or channeling.
the purchaser and the supplier, such as an agreement to use
10.4 Take care not to contaminate the yarn test specimen or
Practice D2258. Consider shipping cases or other shipping
the cleaned yarn-contacting surfaces of the apparatus.
units to be the primary sampling units.
10.5 Feed the yarn through the apparatus. Use identical pin
NOTE 2—An adequate specification or other agreement between the
locations, friction surfaces, and input tensions for all tests to be
purchaser and the supplier requires taking into account the variability
compared directly.
between shipping units, between packages or ends within a shipping unit,
and between specimens from a single package so as to provide a sampling
10.5.1 If the apparatus requires the input tension to be
plan with a meaningful producer’s risk, consumer’s risk, acceptable
standardized, adjust it to 9.8 6 1 mN/tex [0.1 gf/den] for yarns
quality level, and limiting quality level.
having linear densities ranging from 1.5 to 80 tex,
...