ASTM D6859-2018 5625 Standard Test Method for Pile Thickness of Finished Level Pile Yarn Floor Coverings.pdf
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1、Designation: D6859 18Standard Test Method forPile Thickness of Finished Level Pile Yarn Floor Coverings1This standard is issued under the fixed designation D6859; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last rev
2、ision. 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 test method covers the determination of pilethickness of finished level pile yarn floor covering using athickness measuri
3、ng instrument having a stationary surface(platen), a circular pressure foot under specified force, andcapable of being moved vertically above the platen.1.2 This test method is applicable only to finished levelloop, cutpile and cut one 1.000 60.001 in. (25.40 6 0.03 mm) diameter, the other 2.250 6 0
4、.001in. (57.15 6 0.003 mm) in diameter.7.2.3 Having means for indicating the vertical distancebetween the presser foot and the plate to the nearest 0.001 in.(0.03 mm) and capable of developing and indicating a force upto 0.6 lbf (2.77 n) between the presser foot and the plate.8. Conditioning8.1 Cond
5、ition the test sample or test specimens in thestandard atmosphere for testing textiles as directed in PracticeD1776.9. Procedure9.1 Total Thickness:9.1.1 Select the number and location of the test specimensas directed in Section 6. Prepare the test specimens accordingto the procedures listed in Sect
6、ion 8. The test specimens shallbe 10.0 6 0.1 in. (250 6 3 mm) in the lengthwise direction and12.5 6 0.1 in. (320 6 3 mm) in the widthwise direction. Thetest specimens may be prepared according to the examples inAppendix X1.9.1.2 Select a strip specimen from each of the test speci-mens. The strip spe
7、cimens shall be 10.0 6 0.1 in. (250 6 3mm) in the lengthwise direction and 2.5 6 0.1 in. (64 6 3 mm)in the widthwise direction and shall be conditioned as directedin Section 8.9.1.3 Attach the 2.250 in. (57.15 mm) diameter presser footloosely to the moveable stem or head of the instrument andbring t
8、he diameter presser foot into firm contact with the plate.Tighten the presser foot on the stem.9.1.4 Check the instrument zero by lowering the presser footinto contact with the plate until the indicated pressure increasesto the pressure to be used in measuring the indicated distancebetween the foot
9、and the plate, which must read 0 6 0.001 in.(6 0.03 mm). If the reading is not within this range, make anadjustment appropriate to the type of instrument being used.Verify the instrument with calibrated thickness blocks.9.1.5 For each strip specimen, raise the presser foot andcenter the specimen, pi
10、le face up, on the plate under the foot.Lower the presser foot slowly (take about 5 s to apply full load)onto the pile surface until a pressure of 0.100 6 0.003 psi (6896 21 Pa) is exerted on the specimen. Read the distancebetween the presser foot and the plate to the nearest 0.001 in.(0.03 mm), det
11、ermine the total thickness in three different areasfor each strip specimen and record the average as the totalthickness, T.9.1.6 Shear the pile on the strip specimen down to a stubblemeasuring approximately 0.05 in. (1.3 mm).NOTE 1Both adhesive projections and a fiber layer needle punched tothe surf
12、ace of the backing can interfere with shearing the pile down to astubble of 0.05 in. (1.3 mm). Therefore, a seven and one half fold increasein pressure in measuring the thickness of the stubble specimen is used tolevel out minor variations in stubble height.9.2 Backing Thickness:9.2.1 Attach the 1.0
13、00 in. (25.40 mm) diameter presser footloosely to the stem and bring the presser foot into firm contactwith the plate. Tighten the presser foot on the stem. Check theinstrument zero as directed in 9.1.4.D6859 1829.2.2 For each stubble specimen, raise the presser foot andcenter the specimen, stubble
14、side up, on the plate. Lower thepresser foot onto the stubble surface until a pressure of 0.75 60.01 psi (5170 6 69 Pa) is exerted on the stubble specimen.Read the distance between the presser foot and the plate to thenearest 0.01 in. (0.03 mm), determine the backing thickness inthree different area
15、s for of each strip specimen and record theaverage as the backing thickness, B.10. Calculation10.1 A test result is the average of the measurements madeon a set of test specimens described in 6.4. In this method,directions are given only for obtaining a test result from onetest specimen. The value r
16、epresentative of the lot beingsampled will be the average of the test results from eachlaboratory sampling unit.10.2 For each strip specimen calculate the pile thicknessusing Eq 1.P 5 T 2 B (1)where:P = pile thickness, in. (mm),T = average total thickness, in. (mm), andB = average backing thickness,
17、 in. (mm).10.2.1 Calculate the average values of pile thickness andtotal thickness from average values obtained on individual stripspecimens to the nearest 0.01 in. (0.03 mm) for each laboratorysampling unit.10.3 Calculate the average values of pile thickness and totalthickness for the lot from aver
18、age values obtained from alllaboratory sampling units in the lot to the nearest 0.01 in. (0.3mm).11. Report11.1 State the test sample was tested as directed in TestMethod D6859 for determining the pile thickness of level pileyarn floor covering. Describe the material or product sampledand the method
19、 of sampling used.11.2 Report the average pile thickness and when required,total thickness, for each laboratory sampling unit and for thelot.12. Precision and Bias12.1 SummaryIn comparing two averages, the differencesshould not exceed the single-operator precision values shownin Tables 1 and 2 for t
20、he respective number of tests in 95 outof 100 cases when all the observations are taken by the samewell-trained operator using the same piece of equipment andspecimens randomly drawn from the sample of material.Larger differences are likely to occur under all other circum-stances.12.2 Interlaborator
21、y Test DataAn interlaboratory test wasrun in 2000 in which randomly drawn samples of fourmaterials were tested in each of five laboratories. One operatorin each laboratory each tested two specimens of each materialusing Test Method D6859. One of the two specimens wastested on one day and one specime
22、n was tested on a secondday. Analysis of the data was conducted using standardstatistical practice. The components of variance for Pile Thick-ness expressed as standard deviations were calculated to thevalues listed in Table 1. The material; types were:Material A: 1/10 Gauge Level LoopMaterial B: 1/
23、10 Gauge Level LoopMaterial C: 1/10 Gauge Cut PileMaterial D: 1/10 Gauge Cut Pile Graphics12.3 PrecisionFor the components of variance reported inTable 1, two averages of observed values should be consideredsignificantly different at the 95 % probability level if thedifference equals the critical di
24、fference listed in Tables 2 and 3.There were sufficient differences related to the material typeand structure to warrant listing the components of variance andthe critical differences separately.NOTE 2The tabulated values of the critical differences should beconsidered to be a general statement, par
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