ASTM G143-03
(Test Method)Standard Test Method for Measurement of Web/Roller Friction Characteristics
Standard Test Method for Measurement of Web/Roller Friction Characteristics
SCOPE
1.1 This test method covers the simulation of a roller/web transport tribosystem and the measurement of the static and kinetic coefficient of friction of the web/roller couple when sliding occurs between the two. The objective of this test method is to provide users with web/roller friction information that can be used for process control, design calculations, and for any other function where web/roller friction needs to be known.
1.2 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.
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Designation: G 143 – 03
Standard Test Method for
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Measurement of Web/Roller Friction Characteristics
This standard is issued under the fixed designation G 143; 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 Precision Using Data from Interlaboratory Wear or Ero-
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sion Tests
1.1 This test method covers the simulation of a roller/web
G 163 Guide for Digital Data Acquisition in Wear and
transport tribosystem and the measurement of the static and
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Friction Measurements
kinetic coefficient of friction of the web/roller couple when
sliding occurs between the two. The objective of this test
3. Terminology
method is to provide users with web/roller friction information
3.1 Definitions of Terms Specific to This Standard:
that can be used for process control, design calculations, and
3.1.1 blocking, n—unintentional adhesion between plastic
for any other function where web/roller friction needs to be
films or between a film and another surface. D 883
known.
3.1.2 coeffıcient of friction, μ, n—in tribology—the dimen-
1.2 This standard does not purport to address all of the
sionless ratio of the friction force (F) between two bodies to the
safety concerns, if any, associated with its use. It is the
normal force (N) pressing these bodies together. G40
responsibility of the user of this standard to establish appro-
3.1.3 friction force, n—the resisting force tangential to the
priate safety and health practices and determine the applica-
interface between two bodies when, under the action of
bility of regulatory limitations prior to use.
external force, one body moves or tends to move relative to the
2. Referenced Documents other. G40
3.1.4 kinetic coeffıcient of friction, n—the coefficient of
2.1 ASTM Standards:
2
friction under conditions of macroscopic relative motion be-
D 883 Terminology Relating to Plastics
tween two bodies. G40
D 1894 Test Method for Static and Kinetic Coefficients of
2
3.1.5 stick-slip, n—a cyclic fluctuation in the magnitudes of
Friction of Plastic Film and Sheeting
friction force and relative velocity between two elements in
D 3108 Test Method for Coefficient of Friction, Yarn to
3 sliding contact, usually associated with a relaxation oscillation
Metal
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dependent on elasticity in the tribosystem and on a decrease of
E 8 Test Methods for Tension Testing of Metallic Materials
the coefficient of friction with onset of sliding or with increase
E 122 Practice for Choice of Sample Size to Estimate a
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of sliding velocity. G40
Measure of Quality for a Lot or Process
3.1.5.1 Discussion—Classical or true stick-slip, in which
E 177 Practice for Use of the Terms Precision and Bias in
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each cycle consists of a stage of actual stick followed by a
ASTM Test Methods
stage of overshoot slip, requires that the kinetic coefficient is
E 691 Practice for Conducting an Interlaboratory Study to
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lower than the static coefficient. A modified form of relaxation
Determine the Precision of a Test Method
6 oscillation, with near-harmonic fluctuation in motion, can
G 40 Terminology Relating to Wear and Erosion
occur when the kinetic coefficient of friction decreases gradu-
G 115 Guide for Measuring and Reporting Friction Coeffi-
6 ally with increasing velocity within a certain velocity range. A
cients
third type of stick-slip can be due to spatial periodicity of the
G 117 Guide for Calculating and Reporting Measures of
friction coefficient along the path of contact. Random varia-
tions in friction force measurement do not constitute stick-slip.
3.1.6 triboelement, n—one of two or more solid bodies
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This test method is under the jurisdiction of ASTM Committee G02 on Wear
which comprise a sliding, rolling, or abrasive contact, or a
and Erosion and is the direct responsibility of Subcommittee G02.50 on Erosion.
body subjected to impingement or cavitation. G40
Current edition approved June 10, 2003. Published July 2003. Originally
3.1.6.1 Discussion—Contacting triboelements may be in
approved in 1996. Last previous edition approved in 1996 as G 143 – 96.
2
Annual Book of ASTM Standards, Vol 08.01.
direct contact, or may be separated by an intervening lubricant,
3
Annual Book of ASTM Standards, Vol 07.01.
oxide, or other film that affects tribological interactions be-
4
Annual Book of ASTM Standards, Vol 03.01.
5
tween them.
Annual Book of ASTM Standards, Vol 14.02.
6
Annual Book of ASTM Standards, Vol 03.02.
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G143–03
3.1.7 tribosystem, n—
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