1、Designation: D 6962 05Standard Practice forOperation of a Roller Chair Tester for Pile Yarn FloorCoverings1This standard is issued under the fixed designation D 6962; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers a procedure for the operation of aweighted roller chair testing device that rotates and movesacross
3、a test specimen of pile yarn floor coverings.1.2 This practice is applicable for testing unused pile yarnfloor covering of all types.1.3 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parenthesis are forinformation only.1.4 This standard does not purpo
4、rt to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 12
5、3 Terminology Relating to TextilesD 1776 Practice for Conditioning and Testing TextilesD 2240 Standard Test Method for Rubber PropertyDurom-eter HardnessD 5684 Terminology Relating to Pile Floor Coverings3. Terminology3.1 For definitions of terms relating to Pile Floor Coverings,D13.21, refer to Ter
6、minology D 5684.3.1.1 The following terms are relevant to this standard:carpet, durability, finished, finished pile yarn floor covering,floor covering, pile, pile yarn floor covering, practice, resis-tance to delamination, secondary backing, textile floor cover-ing, tufted fabric, underlay.3.2 For a
7、ll other terminology related to textiles, refer toTerminology D 123.4. Summary of Test Method4.1 The carpet test specimen is secured to a table with thepile surface exposed and is subjected to the action of threecastors which produce an eccentric turning motion under aweighted roller chair device th
8、at moves across the test speci-men for a specified number of cycles.5. Significance and Use5.1 This practice is applicable for use in testing the dura-bility of pile yarn floor covering of all types.5.2 This practice is designed to simulate the stress on a pileyarn floor covering from the action of
9、weighted roller chaircasters over an extended period of time.5.3 The specimen is tested under conditions that maysimulate an actual flooring installation. This may include thepile yarn floor covering plus a specified underlayment cush-ion.This practice is used to prepare specimens for additionaltest
10、ing, including but not limited to: visual assessment ofdelamination of the secondary backing, visual assessment ofthe pile surface, resistance to delamination measurement, tuftbind, and pile yarn raveling.5.4 This practice is used to prepare specimens for additionaltesting, including but not limited
11、 to: visual assessment ofdelamination of the secondary backing, visual assessment ofthe pile surface, resistance to delamination measurement, tuftbind, and pile yarn raveling.6. Apparatus and Materials6.1 Roller Chair Tester is constructed of steel with arotating circular table and a weighted roller
12、 fixture, rotatingoff-center to the table. The apparatus also has electroniccontrols, a protective cage, and a vacuum system to remove lintand dust. The area of contact between the rollers and the pileyarn wear will be an annulus with an outside diameter of 6006 15 mm (23.6 6 0.6 in.) and inside dia
13、meter of 100 6 15 mm(3.9 6 0.6 in.).6.1.1 Rotating circular table is 795 6 10 mm (31.3 6 0.4in.) diameter and 12 6 1 mm (0.5 6 0.1 in.) thick with twostabilizing bolts positioned to prevent the specimen frommoving during the test. The base plate rotates at a speed of 2.16 0.4 rad/s (20 6 4 r/min). T
14、he disc base plate rotates in one1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.21 on Pile Yarn Floor Coverings.Current edition approved March 1, 2005. Published April 2005. Originallyapproved in 2003. Last previous editi
15、on approved in 2004 as D 696204.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International
16、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.direction for approximately 3 min and then stops for 3 to 5 sbefore 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 casterwheel
17、s that are 50 6 1mm(26 0.1 in.) diameter by 20 6 1mm (0.75 6 0.1 in.) wide made of polyamide. Hardness is 956 5 Shore A, as measured by Test Method D 2240 for RubberPropertyDurometer Hardness. The three wheels are posi-tioned 130 6 2 mm (5.1 6 0.1 in.) from the center of thefixture and staggered by
18、2.1 6 0.1 radians (120) around thecircle. The wheels are offset from the position in the fixture by32 6 2 mm (1.3 6 0.1 in.) so as to lag behind during the rotarymotion of the fixture.6.1.3 Motor drive controls the rotation of the circular tableand the roller fixture simultaneously at a speed of 6.0
19、 6 0.5rad/s (57 6 5 r/min).6.1.4 Weighted disks provide a force of 30 kg per roller fora total of 90 6 2 kg (198 6 4 lb). A handwheel on a screw isused to engage weights and raise or lower the roller fixture.6.1.5 Protective cage covers the rotating table and rollerfixture and is in place before ope
20、ration of the electric motorbegins.6.1.6 Vacuum cleaner with suction hose is attached to aheight adjustable head to remove lint and residue duringtesting. The width of the vacuum head extends across thesection traveled by the castor chair wheels. The suctionopening is 75 000 6 5,000 mm2(120 6 8in2).
21、 The suctionefficiency is 27 6 3 L/s (60 6 6ft3/min). The vacuum systemwill operate for 1 to 1.5 min for every 5 min of operation of theequipment.6.1.7 The following controls and safety interlocks for themotor are used. Refer to the manufacturers operation guideregarding other controls and operation
22、s:6.1.7.1 Digital counter with setpoint and reset buttons tomeasure and control the total number of cycles of rotation.6.1.7.2 Safety limit switches interlocked to the motor toprevent access to rotating parts during operation.07Vacuum Cleaner08Suction Nozzle09Base Table10Roller Fixture11Handwheel an
23、d weighted disks13Chair Castors14Chain guardsFIG. 1 Roller Castor Chair TesterD69620526.1.7.3 Limit switch in the sample area interlocked to themotor to prevent damage to the equipment in the event thespecimen obstructs the rotational path.6.2 Specimen backing sheet of rigid acrylic or comparablemat
24、erial is 790 6 4 mm (31.25 6 0.13 in.) diameter andapproximately 15 mm (0.6 in.) thick.6.2.1 1 Alternately, use particle board or AC grade plywoodwith the A-side in contact with the specimen, approximately 6to 16 mm (0.25 to 0.625 in.) thick, depending upon thethickness of the composite of carpet, u
25、nderlayment, adhesive,and backing sheet, to permit adequate clearance between thetop of the carpet and limit switch.NOTE 1A thickness of approximately 16 mm (0.625 in.) is preferredto maintain a rigid and stable substrate.6.2.2 Either a circular or semicircular specimen template ordie is used to cut
26、 the carpet specimen. A 790 6 4 mm (31.256 0.13 in.) diameter acrylic sheet is preferred.6.3 Underlayment cushion may be used to simulate thespecific pile yarn floor covering installation. Choose from oneof the many choices of commercially availableunderlayments.6.4 The pile yarn floor covering spec
27、imen, underlaymentcushion (if used), and specimen backing sheet shall be securedtogether following standard pile yarn floor covering installationmethods or alternate methods. This composite will be termedthe test specimen assembly.6.4.1 A flooring adhesive may be applied according to theguidelines o
28、f the manufacturer to secure the test specimen orthe underlayment and test specimen directly to the backingsheet.6.4.2 Alternate methods may be used to secure the testspecimen and underlayment to the backing sheet, including butnot limited to: double sided tape, knitted nylon coated with apressure s
29、ensitive adhesive, tack strips, and wood screws if thespecimen is mounted on plywood.6.5 An upright vacuum cleaner, with a rotating brush andbeater bar, unless this type of apparatus is not recommended bythe manufacturer of the pile yarn floor covering under test, inwhich case the appropriate recomm
30、ended device should beused.7. Sampling7.1 Perform this practice on a test specimen of pile yarnfloor covering measuring 790 6 4 mm (31.25 6 0.13 in.)diameter using a circular template or die.7.1.1 If a semi-circular test specimen is required, use astraight edge and razor knife to cut the specimen in
31、 thedirection of manufacture into two semicircles.7.1.2 Alternately, use a semi-circular template or die to cuta test specimen.8. Conditioning8.1 Condition the specimens as directed in Practice D 1776in the standard atmosphere for testing textiles, which is 21 61C (70 6 2F) and 65 6 2 % relative hum
32、idity, for 24 h oruntil the specimen mass changes no more than 0.1 % in 2 h.9. Preparation of Test Specimens9.1 Direct Adhesion to the Backing Sheet:9.1.1 Apply flooring adhesive according to the guidelines ofthe manufacturer to the backing sheet and attach either a fullcircle test specimen or two s
33、emicircle specimens such that thestraight edges are joined together.9.1.2 Place a backing sheet on the pile side of the specimenand apply a mass of 2.5 to 5.0 kg (5.5 to 11.0 lb) evenlydistributed on the surface of the test specimen to preventcurling of the specimen while the adhesive is curing for
34、aminimum of 12 h.9.1.3 Remove the mass and allow the test specimen tocondition for a minimum of 4 days while the adhesive cures.Maintain sufficient airflow around the sample to permit evapo-ration of the solvent or water from the test specimen.9.2 Direct Adhesion to an Underlayment:FIG. 2 Curved Pat
35、tern of a Castor WheelD69620539.2.1 First secure the underlayment to the backing sheetwith the flooring adhesive according to the guidelines of themanufacturer. After the adhesive has set, secure the testspecimen to the underlayment as in 9.1.9.3 Alternative Adhesion Methods for Full Circle Speci-me
36、ns:9.3.1 Attach a full circle carpet specimen to an acrylic orwood backing sheet using double-faced pressure sensitive tapeor adhesive coated knitted mesh material and condition.9.3.2 Use wood screws around the perimeter of the speci-men at intervals of 75 6 25 mm (3 6 1 in.) to secure thespecimen a
37、nd underlayment, if used, to a plywood backingsheet. The screws are positioned outside of the annular weararea.10. Procedure10.1 Prior to each test, inspect the roller base assembly forsigns of wear or damage. Confirm that the swivel and castorsmove freely when turned by hand without evidence of sti
38、ffnessor looseness and the wheels are smooth and clean.10.1.1 Replace worn or damaged castors with new, factorysupplied equipment. If only the polyamide wheel is damaged,there is no need to replace the bearings. The castors should beexpected to perform acceptably for up to 1 500 000 cycles withregul
39、ar use.10.1.2 For new chair castors or polyamide wheels, conditionthem on a pile yarn surface for a minimum of 25 000 cycles ofrotation prior to testing.10.1.3 Establish and follow a procedure to validate that thewear pattern is correct Use carbonless paper applied to abacking sheet to imprint the w
40、ear pattern and compare againstan established standard for the machine (see Fig. 2).10.2 Prior to testing, vacuum the test specimen with anupright vacuum cleaner making four forward and backwardpasses making sure that all of the area has been covered.10.3 Position the prepared test specimen on the b
41、ase tablesuch that the holes in the backing sheet fit over the stabilizingbolts.10.4 Adjust the vacuum nozzle to a position between 5 and10 mm (0.25 and 0.5 in.) above the yarn pile.10.5 Close the protective cage and visually confirm that thelimit switches are in position.10.6 Set the counter endpoi
42、nt to the total number of cyclesof rotation required.10.7 Check the vacuum filtration and empty or replace iffilled and confirm vacuum operation.10.8 Start the machine in automatic. It will automaticallyswitch off when it completes the designated number of cyclesof rotation.10.9 Remove the test spec
43、imen and backing disk from themachine.11. Report11.1 State that the tester was operated as directed in PracticeD 6962.11.2 Report the following information:11.2.1 The atmospheric conditions if other than standard,11.2.2 All information necessary for complete identificationof the test specimen,11.2.3
44、 Date of test,11.2.4 The number of cycles of rotation,11.2.5 Description and density of underlayment cushion, ifused,11.2.6 Description of adhesive, if used, and11.2.7 Detail any deviations from this practice.12. Keywords12.1 carpet; castor chair tester; delamination; durability;pile yarn floor cove
45、ring; roller chair tester; underlaymentASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the
46、riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of
47、this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldma
48、ke your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D6962054
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