1、Designation: D5252 15Standard Practice forthe Operation of the Hexapod Tumble Drum Tester1This standard is issued under the fixed designation D5252; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r 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 describes the equipment and operation ofthe hexapod tumble drum tester for testing pile floor coveringto produce changes in ap
3、pearance and color due to changes insurface structure by mechanical action tester.1.2 This practice is applicable for use in testing unused pilefloor covering of all types. It is not applicable for use in testingused pile yarn floor coverings.1.3 This practice may be used by mutual agreement between
4、the purchaser and supplier to set purchasing specifications.1.4 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 information onlyand are not considered standard.1.5 This practice does no
5、t purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this practice to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standard
6、s:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD5684 Terminology Relating to Pile Floor Coverings3. Terminology3.1 For all terminology related to Pile Floor Coverings,D13.21, see Terminology D5684.3.1.1 The following terms are relevant to this standard:ca
7、rpet, finished, finished pile yarn floor covering, floorcovering, lengthwise direction, pile, pile lay, pile yarn floorcovering, pitch, practice, primary backing, secondary backing,textile floor covering, texture, tufted fabric.3.2 For all other terminology related to textiles see Termi-nology D123.
8、4. Summary of Practice4.1 The specimen is secured to a backing sheet that ismounted inside the rotatable drum with the pile surfaceexposed. A metal hexapod, with six polyurethane studs, rollsrandomly on the pile surface inside the rotating drum for aspecified number of revolutions.5. Significance an
9、d Use5.1 This equipment may be used to bring about the changesin appearance and texture on the surface of pile floor coveringcaused by mechanical action.6. Apparatus, Materials, and Reagent6.1 Hexapod Tumble Tester6.1.1 DrumConstructed of Nylon or other like materialand capped by a lid that is secur
10、ed by a latching device. Thedrum base and lid have a locating groove to hold the specimenbacking sheet flat to the inner wall of the drum. A photographof a typical drum is shown in Fig. 1 and Fig. 2. The drumdimensions are:Internal Diameter 12 0.18 in. (3025mm)Wall Thickness 0.3 in. approx. (8 mm ap
11、prox.)Internal Depth 8.2 0.02 in. (2075mm)6.1.2 Driving System, cradles the drum on rollers and keepsthe axis of the drum level, and rotates the drum at 35 6 2 rpm(3.6 6 0.2 rad/s). The driving direction reverses after approxi-mately 500 revolutions. After the 500 rotations the unit willstop and sta
12、nd stationary for approximately 5 to 15 s, thenbegin rotating in the opposite direction. After 2000 rotationsthe unit will stop and wait for the operator to restart the unit.6.1.3 Hexapod TumblerThere are two types of HexapodTumblers: the 2.8 lb (1270 g) or the 8.4 lb (3810 g) as specifiedbelow. The
13、 selection of which depends on the end use of thepile floor covering.NOTE 1The 2.8 lb Residential Hexapod Tumbler is recommended forresidential pile floor covering test applications and the 8.4 lb CommercialHexapod Tumbler is recommended for commercial pile floor coveringapplications.6.1.3.1 8.4 lb
14、Commercial Hexapod TumberComprised ofa steel (or other suitable material) 2.0 6 0.04 in. (50 6 1 mm)cube with 1-in. (25-mm) thick plates welded to each side. The1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.21 on Pile Fl
15、oor Coverings.Current edition approved Feb. 1, 2015. Published April 2015. Originallyapproved in 1992. Last previous edition approved in 2011 as D5252 05. DOI:10.1520/D5252-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. Fo
16、r Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1outside corners are welded such that when the studs are fittedand the h
17、exapod placed on a flat surface, no metal touches theflat surface. The total length of any axis, not including hexapodfeet, should be 3.8 6 0.08 in. (96 6 2 mm). Replaceabletumbler feet (see 6.1.3.3) are screwed centrally into each face.The specified total mass of Commercial Hexapod Tumbler withsix
18、feet installed is 8.4 6 0.2 lb (3810 6 90 g). A photographof a typical 8.4 lb Commercial Hexapod Tumbler is shown inFig. 3.6.1.3.2 2.8 lb Light Residential Hexapod TumblerComprised of aluminum (or other suitable material) 2.00 60.04 in. (50 6 1 mm) cube with 25-mm (1-in.) thick plateswelded to each
19、side. The outside corners are welded such thatwhen the studs are fitted and the hexapod placed on a flatsurface, no metal touches the flat surface.Alternatively, the ballmay be milled from a solid block if the construction meets thespecification. The total length of any axis, not includinghexapod st
20、uds, should be 3.8 6 0.08 in. (96 6 2 mm).Replaceable tumbler feet are screwed centrally in each face.The specified total mass of the Residential Hexapod Tumblerwith six feet installed is 2.8 6 0.13 lb (1270 6 60 g). Aphotograph of a typical 2.8 lb Residential Hexapod Tumbler isshown in Fig. 4.6.1.3
21、.3 Hexapod Tumbler Feet Specifications (see Fig. 5)Tumbler Feet parameters are:Diameter of Foot 1.60 0.04 in. (401mm)Height of Foot 0.60 0.04 in. (151mm)Edge of Radius Stud 0.60 0.04 in. (151mm)Steel Backing for PolyurethaneFoot Hardness 8.3 6 Type A DurometerFoot Thickness 0.12 0.01 in. (3.00 0.25
22、mm)Threading for 0.75 in.Bolt to attach Foot toTumblerMetric M8 1.25 (typical)6.2 Specimen Backing Sheet, polyethylene approximately375 by 8.5 by 0.08 in. (approximately 950 by 215 by 2 mm).6.3 Tape, double-sided adhesive, approximately 2.0 in. (50mm) width.6.4 Vacuum CleanerEach specimen shall be v
23、acuumedand pile erected with a hand-held vacuum that meets thefollowing general specifications: powered rotating brush, bagless design, HEPA filtration, 7 A motor, nozzle width 6.5 6 0.3FIG. 1 Typical Front View of Drum CoverFIG. 2 Typical Inside of Drum without CoverFIG. 3 8.4 lb Commercial Hexapod
24、 TumblerFIG. 4 2.8 lb Residential Hexapod TumblerD5252 152in. (165 6 7 m), and overall weight 6.5 6 0.5 lb (3.0 6 0.2 kg).Replace the rotating brush when the bristle length changesmore than 15 % of the original length. An upright vacuumapproved in the CRI Seal of Approval Program shall beacceptable
25、for use in this practice.6.5 Cleaning Frame (optional), a rectangular frame ap-proximately 40 by 12 in. (1000 by 300 mm) with a centralrectangular aperture approximately 37 by 8 in. (940 by 200mm) to receive the test specimen. The frame should be madefrom a material of similar construction to the te
26、st specimen andmounted on a rigid backing sheet.6.6 SolventUse only ethyl alcohol, or isopropyl alcohol,technical grade.7. Preparation of Specimen7.1 Marking SpecimenBefore cutting out the testspecimen, mark on the backing the direction of manufacturewith the head of the arrow pointing in the same d
27、irection as thelay of the pile.7.2 Size of SpecimenCut the specimen approximately 37by 8 in. (940 by 200 mm) with the long dimension parallel tothe lengthwise direction of the pile yarn floor covering. Take nospecimen within 4.0 in. (100 mm) of the trimmed selvedge.Alternatively, up to four smaller
28、specimens of similar thicknessmay be tested together, although if this is done, the effect offiber or finish must be considered. If this is the case, cut thespecimen to allow for a 0.2-in. (5-mm) gap between eachspecimen, and ensure that the pile lay is in the same direction.NOTE 2Texture change res
29、ults can be noticeably different whentesting a specimen in the machine direction versus across the machinedirection.7.3 Cleaning of SpecimenPrior to testing, vacuum thespecimen to remove any loose tufts or fibers.7.4 Specimen AttachmentAttach the double-sided adhe-sive tape along each side and acros
30、s the end of the specimenbacking sheet leaving approximately 0.2 in. (5 mm) clear ateach edge, pressing down firmly to ensure adhesion. If testingmultiple specimens, attach an additional strip tape at each crossjunction. Mount the specimen pile surface uppermost, allowinga 0.2 in. (5 mm) gap at the
31、end and between 0.2 to 0.4 in. (5 to10 mm) between specimens to allow space for the pile whenthe backing sheet is curved to fit the drum.8. Conditioning8.1 Condition and determine that moisture equilibrium fortesting has been attained as directed in Practice D1776.9. Procedure9.1 Perform this practi
32、ce on a specimen prepared as de-scribed in Section 8, maintaining the Hexapod Tumble DrumTester in a temperature controlled atmosphere of 70 6 5F (216 3C) for testing textiles.9.2 Wipe the hexapod tumbler and the inside of the drumwith a clean lint-free tissue or cloth and one of the recom-mended so
33、lvents.9.3 Ensure that the Hexapod Tumble Drum Testing Unit hasbeen maintained to the recommended checks found in AnnexA1.9.4 Ensure that the specimen lies smoothly around theinternal circumference when the backing sheet is curved to fitthe drum and that it is firmly held in place by the locatinggro
34、oves. If necessary, adjust the specimen length.9.5 Place the selected hexapod tumbler in the drum on thespecimen surface.9.6 Secure the lid to the drum and position the drum on therollers of the drive mechanism. Ensure that the drum is level.9.7 Set the revolution counter for 2000 revolutions. Whent
35、he machine stops, remove the mounted specimen and prepareto vacuum the specimen. An optional central aperture of thecleaning frame can be used to hold the specimen.9.8 Using the vacuum cleaner, make four passes (1 pass = 1forward and back motion) along the length of the mountedspecimen. The entire s
36、pecimen must be vacuumed and the finalpass must be in the lay of the pile.9.9 Return the mounted specimen to the drum and repeat 9.4 9.8 until the required number of rotations has been com-pleted.9.10 Do not let the tumbler lay on the specimen withoutmovement for more than 2 h.10. Report10.1 State t
37、hat the tester was operated as directed in PracticeD5252.10.2 Report the following information:10.2.1 The number of drum rotations.10.2.2 The type of vacuum cleaner used.10.2.3 Detail any deviations from this practice.10.2.4 The type of Tumbler used (8.4 lb CommercialHexapod Tumbler or 2.8 lb Reside
38、ntial Hexapod Tumbler).11. Keywords11.1 appearance; carpet; floor covering; hexapod; pile yarnFIG. 5 Typical Hexapod Tumbler FootD5252 153ANNEXA1. HEXAPOD POD UNIT, QUALITY CONTROL AND REPEATABILITY PROCESS (Mandatory Practices)(Mandatory Information)A1.1 To ensure unit to unit reproducibility, it i
39、s importantfor every unit and tumbler combination to be evaluated forconformance to the specifications listed in this annex. Theoperators of this equipment must understand and consistentlyobserve the running of the equipment and report any discrep-ancies for repair.A1.2 Verify the r/min of each mach
40、ine is 35 6 2 r/min atleast weekly. If the r/min is not within specification then takethe unit out of service, and check the followingA1.2.1 Drive belt worn or out of tension.A1.2.2 Evaluate counting system for improper set up orfunction. If using a reflectance system replace tape/clean eyes.If usin
41、g a metal proximity system evaluate the distancebetween sensors.A1.2.3 If r/min is not within specification then make anadjustment to the speed to obtain the proper r/min.A1.2.4 If the unit is gear driven, consider changing drivepulley size or converting unit to variable drive system.A1.3 Evaluate o
42、perational control of the hexapod unit atleast once every 6 months. If the unit fails any of theverifications remove the unit from service until repaired.A1.3.1 Check each units programmed rotation cycle. Theunit must rotate in one direction for approximately 500rotations (or 14.5 min); stop, wait a
43、pproximately 60 s, and thenrotate in the opposite direction for another 500 rotations (or14.5 min). The units control system should produce a cycle of2000 rotations; stop and wait for the operator to remove thespecimen for vacuuming.A1.3.2 Ensure that the unit stops when the desired numberof rotatio
44、ns has been obtained.A1.4 Hexapod Tumblers should be weighed with newhexapod feet installed. If weight is out of specification makenecessary changes to ensure tumbler is in specification.A1.4.1 Weight for 8.4 lb Commercial Hexapod Tumbler8.40 6 0.20 lb (3810 6 90 g)A1.4.2 Weight for 2.8 lb Residenti
45、al Hexapod Tumbler 2.806 0.13 lb (1270 6 60 g)A1.5 Hexapod Tumbler feet should meet all specificationsfor manufacture, and should be evaluated for the followingattributes before being put into service, and during the normalcourse of it usefulness. Check each foot for cuts, tears,abrasions, and any o
46、ther damage or imperfections that mightcause additional texture change to the test specimen. If founddiscard the foot, and replace with a new foot.A1.5.1 Shape must meet the specifications found in 6.1.3.3.Shape will change over time; visually check specimen versus acontrol Tumbler Foot, and determi
47、ne if the shape is changing.If the shape becomes visually different discard all studs andreplace with new.A1.5.2 Check hardness of stud versus 6.1.3.3. Typically, thehardness will change with usage. If the hardness exceeds thetolerance remove from use.A1.6 Break In Period for New Hexapod Feet:A1.6.1
48、 When installing a complete set of new hexapod feet,run the ball with new feet for 24 h on a trial carpet specimen(no vacuuming required). This break in period is necessary toensure accurate results for the life of the stud.A1.6.2 If the unit has been in constant use, it is recom-mended that the fee
49、t of a hexapod unit be replaced every 6months or 1 million cycles. Constant use equals 20 h/week for26 weeks.A1.7 Hexapod Unit to Unit Texture Change EvaluationIfmultiple hexapod units are used within a facility, an evaluationof the texture change produced should be conducted twice peryear. Specimen for the evaluation should be sampled from thesame carpet sample. The results are evaluated to ensure eachunit will produce similar texture change results.ASTM International takes no position respecting the validity of any patent rights asserted
