ASTM D6962-03

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D 6962 – 03
Standard Practice for
Operation of a Roller Chair Tester for Pile Yarn Floor
Coverings
This standard is issued under the fixed designation D 6962; 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 5. Significance and Use
1.1 This practice covers a procedure for the operation of a 5.1 This practice is applicable for use in testing the dura-
weighted roller chair testing device that rotates and moves bility of pile yarn floor covering of all types.
across a test specimen of pile yarn floor coverings. 5.2 This practice is designed to simulate the stress on a pile
1.2 This practice is applicable for testing unused pile yarn yarn floor covering from the action of weighted roller chair
floor covering of all types. casters over an extended period of time.
1.3 The values stated in SI units are to be regarded as the 5.3 The specimen is tested under conditions that may
standard. The inch-pound units given in parenthesis are for simulate an actual flooring installation. This may include the
information only. pile yarn floor covering plus a specified underlayment cush-
1.4 This standard does not purport to address all of the ion.This practice is used to prepare specimens for additional
safety concerns, if any, associated with its use. It is the testing, including but not limited to: visual assessment of
responsibility of the user of this standard to establish appro- delamination of the secondary backing, visual assessment of
priate safety and health practices and determine the applica- the pile surface, resistance to delamination measurement, tuft
bility of regulatory limitations prior to use. bind, and pile yarn raveling.
5.4 This practice is used to prepare specimens for additional
2. Referenced Documents
testing, including but not limited to: visual assessment of
2.1 ASTM Standards:
delamination of the secondary backing, visual assessment of
D 123 Terminology Relating to Textiles the pile surface, resistance to delamination measurement, tuft
D 1776 Practice for Conditioning and Testing Textiles
bind, and pile yarn raveling.
D 2240 Standard Test Method for Rubber Property–Durom-
6. Apparatus and Materials
eter Hardness
D 5684 Terminology Relating to Pile Floor Coverings 6.1 Roller Chair Tester is constructed of steel with a
rotating circular table and a weighted roller fixture, rotating
3. Terminology
off-center to the table. The apparatus also has electronic
3.1 Definitions:
controls, a protective cage, and a vacuum system to remove lint
3.1.1 For definitions of pile yarn floor covering related and dust. The area of contact between the rollers and the pile
terms used in this standard, refer to Terminology D 5684.
yarn wear will be an annulus with an outside diameter of 600
3.1.2 For definitions of other textile terms used in this 6 15 mm (23.6 6 0.6 in.) and inside diameter of 100 6 15 mm
standard, refer to Terminology D 123.
(3.9 6 0.6 in.).
6.1.1 Rotating circular table is 795 6 10 mm (31.3 6 0.4
4. Summary of Test Method
in.) diameter and 12 6 1 mm (0.5 6 0.1 in.) thick with two
4.1 The carpet test specimen is secured to a table with the
stabilizing bolts positioned to prevent the specimen from
pile surface exposed and is subjected to the action of three
moving during the test. The base plate rotates at a speed of 2.1
castors which produce an eccentric turning motion under a
6 0.4 rad/s (20 6 4 r/min). The disc base plate rotates in one
weighted roller chair device that moves across the test speci-
direction for approximately 3 min and then stops for 3 to 5 s
men for a specified number of cycles.
before reversing direction.
6.1.2 The roller fixture is offset 198 6 4 mm (7.8 6 0.2 in.)
from the center of the base plate and has three chair caster
wheels that are 50 6 1mm(2 6 0.1 in.) diameter by 20 6 1
This practice is under the jurisdiction of ASTM Committee D13 on Textiles and
mm (0.75 6 0.1 in.) wide made of polyamide. Hardness is 95
is the direct responsibility of Subcommittee D13.21 on Pile Yarn Floor Coverings.
Current edition approved Oct. 1, 2003. Published October 2003. 6 5° Shore A, as measured by Test Method D 2240 for Rubber
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6962–03
07—Vacuum Cleaner
08—Suction Nozzle
09—Base Table
10—Roller Fixture
11—Handwheel and weighted disks
13—Chair Castors
14—Chain guards
FIG. 1 Roller Castor Chair Tester
Property—Durometer Hardness. The three wheels are posi- efficiency is 27 6 3 L/s (60 6 6ft /min). The vacuum system
tioned 130 6 2 mm (5.1 6 0.1 in.) from the center of the will operate for 1 to 1.5 min for every 5 min of operation of the
fixture and staggered by 2.1 6 0.1 radians (120°) around the equipment.
circle. The wheels are offset from the position in the fixture by
6.1.7 The following controls and safety interlocks for the
32 6 2 mm (1.3 6 0.1 in.) so as to lag behind during the rotary
motor are used. Refer to the manufacturer’s operation guide
motion of the fixture.
regarding other controls and operations:
6.1.3 Motor drive controls the rotation of the circular table
6.1.7.1 Digital counter with setpoint and reset buttons to
and the roller fixture simultaneously at a speed of 6.0 6 0.5
measure and control the total number of cycles of rotation.
rad/s (57 6 5 r/min).
6.1.7.2 Safety limit switches interlocked to the motor to
6.1.4 Weighted disks provide a force of 30 kg per roller for
prevent access to rotating parts during operation.
a total of 90 6 2 kg (198 6 4 lb). A handwheel on a screw is
6.1.7.3 Limit switch in the sample area interlocked to the
used to engage weights and raise or lower the roller fixture.
motor to prevent damage to the equipment in the event the
6.1.5 Protective cage covers the rotating table and roller
specimen obstructs the rotational path.
fixture and is in place before operation of the electric motor
6.2 Specimen backing sheet of rigid acrylic or comparable
begins.
material is 790 6 4 mm (31.25 6 0.13 in.) diameter and
6.1.6 Vacuum cleaner with suction hose is attached to a
approximately 15 mm (0.6 in.) thick.
height adjustable head to remove lint and residue during
testing. The width of the vacuum head extends across the 6.2.1 Alternately, use AC grade plywood with the A-side in
section traveled by the castor chair wheels. The suction contact with the specimen, approximately 6 to 16 mm (0.25 to
2 2
opening is 75 000 6 5,000 mm (120 6 8in ). The suction 0.625 in.) thick, depending upon the thickness of the composite
D6962–03
of carpet, underlayment, adhesive, and backing sheet, to permit 7.1.1 If a semi-circular test specimen is required, use a
adequate clearance between the top of the carpet and limit straight edge and razor knife to cut the specimen in the
switch. direction of manufacture into two semicircles.
7.1.2 Alternately, use a semi-circular temp
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