1、Designation: D6962 12Standard Practice forOperation of a Roller Chair Tester for Pile Yarn FloorCoverings1This standard is issued under the fixed designation D6962; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 a t
3、est 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 inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for inf
4、ormation onlyand are not considered standard.1.4 This standard does not purport 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 regula
5、tory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2240 Test Method for Rubber PropertyDurometerHardnessD5684 Terminology Relating to Pile Floor Coverings3. Terminology3.1 For definitions
6、of terms relating to Pile Floor Coverings,D13.21, refer to Terminology D5684.3.1.1 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 backin
7、g, textile floor cover-ing, tufted fabric, underlay.3.2 For all other terminology related to textiles, refer toTerminology D123.4. 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 ecc
8、entric turning motion under aweighted roller chair device that 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
9、 the stress on a pileyarn floor covering from the action of 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 cushion.5.
10、4 This practice is used to prepare specimens for additionaltesting, 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.6. Apparatus and Materials6.1 Ro
11、ller Chair Tester is constructed of steel with arotating circular table and a weighted roller 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 w
12、ear will be an annulus with an outside diameter of 23.66 0.6 in. (600 6 15 mm) and inside diameter of 3.9 6 0.6 in.(100 6 15 mm).6.1.1 Rotating circular table is 31.3 6 0.4 in. (795 6 10mm) diameter and 0.5 6 0.1 in. (12 6 1 mm) thick with twostabilizing bolts positioned to prevent the specimen from
13、moving during the test. The base plate rotates at a speed of 2.11This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.Current edition approved Feb. 1, 2012. Published March 2012. Originallyapproved in
14、2003. Last previous edition approved in 2005 as D696205. DOI:10.1520/D6962-12.2For 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 on
15、the ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6 0.4 rad/s (20 6 4 r/min). The disc base plate rotates in onedirection for approximately 3 min and then stops for 3 to 5 sbefore reversing direction.6.1.2 The roller f
16、ixture is offset 7.8 6 0.2 in. (198 6 4 mm)from the center of the base plate and has three chair casterwheels that are 2.0 6 0.1 in. (50 6 1 mm) diameter by 0.75 60.10 in. (20 6 1 mm) wide made of polyamide. Hardness is 956 5 Shore A, as measured by Test Method D2240 for RubberPropertyDurometer Hard
17、ness. The three wheels are posi-tioned 5.1 6 0.1 in. (130 6 2 mm) from the center of thefixture and staggered by 2.1 6 0.1 radians (120) around thecircle. The wheels are offset from the position in the fixture by1.3 6 0.1 in. (32 6 2 mm) so as to lag behind during the rotarymotion of the fixture.6.1
18、.3 Motor drive controls the rotation of the circular tableand the roller fixture simultaneously at a speed of 6.0 6 0.5rad/s (57 6 5 r/min).6.1.4 Weighted disks provide a force of 66 lb per roller fora total of 198 6 4lb(906 2 kg). A handwheel on a screw isused to engage weights and raise or lower t
19、he roller fixture.6.1.5 Protective cage covers the rotating table and rollerfixture and is in place before operation 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 extend
20、s across thesection traveled by the castor chair wheels. The suctionopening is 120 6 8in2(75 000 6 5000 mm2). The suctionefficiency is 60 6 6ft3/min (27 6 3 L/s). 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 inter
21、locks for themotor are used. Refer to the manufacturers operation guideregarding other controls and operations:07Vacuum Cleaner08Suction Nozzle09Base Table10Roller Fixture11Handwheel and weighted disks13Chair Castors14Chain guardsFIG. 1 Roller Castor Chair TesterD6962 1226.1.7.1 Digital counter with
22、 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.6.1.7.3 Limit switch in the sample area interlocked to themotor to prevent damage to the equipment in th
23、e event thespecimen obstructs the rotational path.6.2 Specimen backing sheet of rigid acrylic or comparablematerial is 31.25 6 0.13 in. (790 6 4 mm) diameter andapproximately 0.6 in. (15 mm) thick.6.2.1 1 Alternately, use particle board or AC grade plywoodwith the A-side in contact with the specimen
24、, approximately0.25 to 0.625 in. (6 to 16 mm) thick, depending upon thethickness of the composite of carpet, underlayment, adhesive,and backing sheet, to permit adequate clearance between thetop of the carpet and limit switch.NOTE 1A thickness of approximately 0.625 in. (16 mm) is preferredto mainta
25、in a rigid and stable substrate.6.2.2 Either a circular or semicircular specimen template ordie is used to cut the carpet specimen. A 31.25 6 0.13 in. (7906 4 mm) diameter acrylic sheet is preferred.6.3 Underlayment cushion may be used to simulate thespecific pile yarn floor covering installation. C
26、hoose from oneof the many choices of commercially availableunderlayments.6.4 The pile yarn floor covering specimen, underlaymentcushion (if used), and specimen backing sheet shall be securedtogether following standard pile yarn floor covering installationmethods or alternate methods. This composite
27、will be termedthe test specimen assembly.6.4.1 A flooring adhesive may be applied according to theguidelines of 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 underlayme
28、nt to the backing sheet, including butnot limited to: double sided tape, knitted nylon coated with apressure sensitive 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
29、recommended bythe manufacturer of the pile yarn floor covering under test, inwhich case the appropriate recommended device should beused.7. Sampling7.1 Perform this practice on a test specimen of pile yarnfloor covering measuring 31.25 6 0.13 in. (790 6 4 mm)diameter using a circular template or die
30、.7.1.1 If a semi-circular test specimen is required, use astraight edge and razor knife to cut the specimen in 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 Pract
31、ice D1776in the standard atmosphere for testing textiles, which is 70 62F (21 6 1C) and 65 6 2 % relative humidity, 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
32、 the guidelines ofthe manufacturer to the backing sheet and attach either a fullcircle test specimen or two semicircle 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 5.5 to 11.0 lb (2.5 to 5.0 kg) evenlydistri
33、buted on the surface of the test specimen to preventcurling of the specimen while the adhesive is curing for aminimum of 12 h.FIG. 2 Curved Pattern of a Castor WheelD6962 1239.1.3 Remove the mass and allow the test specimen tocondition for a minimum of 4 days while the adhesive cures.Maintain suffic
34、ient airflow around the sample to permit evapo-ration of the solvent or water from the test specimen.9.2 Direct Adhesion to an Underlayment:9.2.1 First secure the underlayment to the backing sheetwith the flooring adhesive according to the guidelines of themanufacturer. After the adhesive has set, s
35、ecure the testspecimen to the underlayment as in 9.1.9.3 Alternative Adhesion Methods for Full Circle Speci-mens: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 wo
36、od screws around the perimeter of the speci-men at intervals of 3 6 1 in. (75 6 25 mm) to secure thespecimen and 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
37、 of wear or damage. Confirm that the swivel and castorsmove freely when turned by hand without evidence of stiffnessor 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
38、replace the bearings. The castors should beexpected to perform acceptably for up to 1 500 000 cycles withregular 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 procedu
39、re to validate that thewear pattern is correct Use carbonless paper applied to abacking sheet to imprint the wear 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 back
40、wardpasses making sure that all of the area has been covered.10.3 Position the prepared test specimen on the base tablesuch that the holes in the backing sheet fit over the stabilizingbolts.10.4 Adjust the vacuum nozzle to a position between 0.25and 0.5 in. (5 and 10 mm) above the yarn pile.10.5 Clo
41、se the protective cage and visually confirm that thelimit switches are in position.10.6 Set the counter endpoint 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
42、automaticallyswitch off when it completes the designated number of cyclesof rotation.10.9 Remove the test specimen and backing disk from themachine.11. Report11.1 State that the tester was operated as directed in PracticeD6962.11.2 Report the following information:11.2.1 The atmospheric conditions i
43、f other than standard,11.2.2 All information necessary for complete identificationof the test specimen,11.2.3 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 f
44、rom this practice.12. Keywords12.1 carpet; castor chair tester; delamination; durability;pile yarn floor covering; 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
45、of this standard are expressly advised that determination of the validity of any such patent rights, and the 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 fi
46、ve years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of 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
47、committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake 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, P
48、A 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D6962 124
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