Standard Test Method for
Fiber Cohesion in Roving, Sliver, and Top in Dynamic Tests1

This standard is issued under the fixed designation D 4120; 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

1.1 This test method describes the measurement of fiber
cohesion as the dynamic cohesive force required to maintain
drafting in rovings, slivers or tops when they are subjected to
stress induced by passing between pairs of drafting rolls of
different surface speeds. The cohesive force is converted to
cohesive tenacity based on the linear density of the material.
NOTE 1—For static tests refer to Test Method D 2612.

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.

2. Referenced Documents

2.1 ASTM Standards:
D 123 Terminology Relating to Textiles2
D 519 Test Method for Length of Fiber in Wool Top2
D 1440 Test Method for Length and Length Distribution of
Cotton Fibers (Array Method)2
D 1447 Test Method for Length and Length Uniformity of
Cotton Fibers by Fibrograph Measurement2
D 1575 Test Method for Fiber Length of Wool in Scoured
Wool and in Card Sliver2
D 1776 Practice for Conditioning and Testing Textiles2
D 2258 Practice for Sampling Yarn for Testing2
D 2612 Test Method for Fiber Cohesion in Sliver and Top in
Static Tests2
D 3333 Practice for Sampling Manufactured Staple Fibers,
Sliver, or Tow for Testing3
D 4848 Terminology of Force, Deformation and Related
Properties3

3. Terminology

3.1 Definitions:

3.1.1 cohesive force, n—in a textile strand, the force required to overcome fiber cohesion as the strand is being

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