1、Designation: D5252 11Standard 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, floor cover-ing, lengthwise direction, pile, pile lay, pile yarn floor cover-ing, pitch, practice, primary backing, secondary backing,textile floor covering, texture, tufted fabric.3.2 For all other terminology related to textiles see Termi-nology D
8、123.4. 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. Significanc
9、e and 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 s
10、ecured 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 6 0.18 in. (302 6 5 mm)Wall Thickness 0.3 in. approx
11、. (8 mm approx.)Internal Depth 8.2 6 0.02 in. (207 6 5 mm)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
12、willstop and stand 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 spe
13、cifiedbelow. The 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
14、.6.1.3.1 8.4 lb 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. Theoutside corners are welded such that when the studs are fittedand the hexapod placed on a flat surface, no metal touches th
15、eflat surface. The total length of any axis, not including hexapod1This 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 Sept. 15, 2011. Published October 2011. Originallyapprov
16、ed in 1992. Last previous edition approved in 2005 as D5252 05. DOI:10.1520/D5252-11.2For 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
17、page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.feet, 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 Hex
18、apod Tumbler withsix 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
19、plateswelded to each 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, no
20、t includinghexapod studs, 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 is
21、shown in Fig. 4.6.1.3.3 Hexapod Tumbler Feet Specifications (see Fig. 5)Tumbler Feet parameters are:FIG. 1 Typical Front View of Drum CoverFIG. 2 Typical Inside of Drum without CoverFIG. 3 8.4 lb Commercial Hexapod TumblerFIG. 4 2.8 lb Residential Hexapod TumblerFIG. 5 Typical Hexapod Tumbler FootD5
22、252 112Diameter of Foot 1.60 6 0.04 in. (40 6 1 mm)Height of Foot 0.60 6 0.04 in. (15 6 1 mm)Edge of Radius Stud 0.60 6 0.04 in. (15 6 1 mm)Steel Backing for PolyurethaneFoot Hardness 8.3 6 6 Type A DurometerFoot Thickness 0.12 6 0.01 in. (3.00 6 0.25 mm)Threading for 0.75 in.Bolt to attach Foot toT
23、umblerMetric 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 vacuumedand pile erected with a hand-held vacuum
24、that meets thefollowing general specifications: powered rotating brush, bagless design, HEPA filtration, 7 A motor, nozzle width 6.5 6 0.3in. (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.6.
25、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 test specimen andmounted on a
26、 rigid backing sheet.6.6 SolventUse only ethyl alcohol, or isopropyl alcohol,technical grade.7. Preparation of Specimen7.1 Marking SpecimenBefore cutting out the test speci-men, mark on the backing the direction of manufacture withthe head of the arrow pointing in the same direction as the layof the
27、 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 specimens of similar thic
28、knessmay 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 results can be noticeably di
29、fferent 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 across the end of the specimen
30、backing 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 end and between 0.2 to 0.
31、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 Bring the specimen to moisture equilibrium for testingin the standard atmosphere approaching equilibrium from thedry side without the use of heat. Determine that moistur
32、eequilibrium for testing has been attained as directed in PracticeD1776.9. Procedure9.1 Perform this practice 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 hexa
33、pod tumbler and the inside of the drumwith a clean lint-free tissue or cloth and one of the recom-mended solvents.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 circumfer
34、ence when the backing sheet is curved to fitthe drum and that it is firmly held in place by the locatinggrooves. 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 th
35、e drive mechanism. Ensure that the drum is level.9.7 Set the revolution counter for 2000 revolutions. Whenthe 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,
36、 make four passes (1 pass = 1forward and back motion) along the length of the mountedspecimen. The entire specimen must be vacuumed and the finalpass must be in the lay of the pile.9.9 Return the mounted specimen to the drum and repeat9.4-9.8 until the required number of rotations has been com-plete
37、d.9.10 Do not let the tumbler lay on the specimen withoutmovement for more than 2 h.10. Report10.1 State that 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 deviat
38、ions from this practice.10.2.4 The type of Tumbler used (8.4 lb CommercialHexapod Tumbler or 2.8 lb Residential Hexapod Tumbler).11. Keywords11.1 appearance; carpet; floor covering; hexapod; pile yarnD5252 113ANNEXA1. HEXAPOD POD UNIT, QUALITY CONTROL AND REPEATABILITY PROCESS (Mandatory Practices)(
39、Mandatory Information)A1.1 To ensure unit to unit reproducibility, it is 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
40、report any discrep-ancies for repair.A1.2 Verify the r/min of each machine 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 or
41、function. If using a reflectance system replace tape/clean eyes.If using 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 drive
42、pulley size or converting unit to variable drive system.A1.3 Evaluate operational 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 o
43、ne direction for approximately 500rotations (or 14.5 min); stop, wait approximately 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 vacuum
44、ing.A1.3.2 Ensure that the unit stops when the desired numberof rotations 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 Hexapo
45、d Tumbler8.40 6 0.20 lb (3810 6 90 g)A1.4.2 Weight for 2.8 lb Residential 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
46、 of it usefulness. Check each foot for cuts, tears,abrasions, and any other 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
47、time; visually check specimen versus acontrol Tumbler Foot, and determine 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 thetol
48、erance remove from use.A1.6 Break In Period for New Hexapod Feet:A1.6.1 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.
49、2 If the unit has been in constant use, it is recom-mended that the feet 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 resp
