1、Designation: D 3775 07Standard Test Method forWarp (End) and Filling (Pick) Count of Woven Fabrics1This standard is issued under the fixed designation D 3775; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. 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 test method covers the measurement of warp endcount and filling pick count and is applicable to all types ofwoven fabrics.NO
3、TE 1Historically, the term fabric count has been used to describethe end and pick count of woven fabrics. The terms warp (end) and filling(pick) count are replacing the term fabric count, to provide clarity.1.2 The values stated in SI units are to be regarded as thestandard. The values given in pare
4、ntheses are for informationonly.1.3 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 regulatory limitati
5、ons prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 1776 Practice for Conditioning and Testing TextilesD 4850 Terminology Relating to FabricD 7023 Terminology Relating to Home Furnishings2.2 Other Standard:ANSI/ASQC Z1.4Inspection by Attributes33. Term
6、inology3.1 Definitions:3.1.1 For definitions of textile terms used in this testmethod; count, end, end count, filling, pick, pick count, andthread count, refer to Terminology D 4850.3.1.2 For definition of the term thread count, refer toTerminology D 7023.3.1.3 For other textile terms used in this t
7、est method, refer toTerminology D 123.4. Summary of Test Method4.1 The number of warp yarns (ends) per unit distance andfilling yarns (picks) per unit distance are determined usingsuitable magnifying and counting devices or by raveling yarnsfrom fabrics. See ANSI Z1.4.5. Significance and Use5.1 This
8、 test method is considered satisfactory for accep-tance testing of commercial shipments because it has been usedextensively in the trade for that purpose.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories (or more),comparative test should be
9、performed to determine if there is astatistical bias between them, using competent statistical assis-tance. As a minimum, use the samples for such a comparativetest that are as homogeneous as possible, drawn from the samelot of material as the samples that resulted in disparate resultsduring initial
10、 testing and randomly assigned in equal numbersto each laboratory. The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data, a probability level chosen prior to the testingseries. If bias is found, either its cause must be found andcorrected, or fut
11、ure test results for that material must beadjusted in consideration of the known bias.6. Apparatus6.1 Use any suitable device, such as pick glass, rule andpointer, microfilm reader, or projection equipment.6.2 Use a scale graduated in mm (116 in.) to measure thewidth of the fabric test specimen to b
12、e raveled for a count ofyarns.1This test method is under the jurisdiction of ASTM Committee D13 on FabricTest Methods, SpecificCurrent edition approved Aug. 1, 2007. Published October 2007. ReplacesSections 28 to 34 of Methods D 1910 64 (1975). Originally approved in 1979 asD 3775 79. Last previous
13、edition approved in 2003 as D 3775 03a.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 tot he standards Document Summary page onthe ASTM website.3Available from Americ
14、an National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take at random the number of rolls of fabr
15、ic as directed in anapplicable material specification or other agreement betweenthe purchaser and the supplier. Consider rolls of fabric to be theprimary sampling units.7.2 Laboratory SampleAs a laboratory sample, take a fullwidth swatch at least2m(2yd)long from each roll of fabricin the lot sample.
16、 Consider each designated place at whichwarp end counts and filling pick counts are made as a testspecimen.NOTE 2For specimens not obtained as directed in Section 7, theresults should not be used for acceptance testing of a lot.8. Conditioning8.1 Condition specimens as directed in Practice D 1776.8.
17、2 Fabrics woven from yarns having a relatively lowmoisture regain in the standard atmosphere for testing textiles,which is 21 6 1 C (70 6 2 F) and 65 % relative humidity,and which are not significantly affected by minor variations indifferent atmospheric conditions, for example, nylons, acrylics,and
18、 polyesters, may be tested without preconditioning. Fabricswoven from yarns composed wholly or in part from wool,rayon, cotton, or acetate are more sensitive to atmosphericchanges and must be conditioned prior to testing, except byagreement of all parties interested in the test results.8.3 When full
19、 rolls or bolts of fabric cannot be properlyconditioned in a reasonable time with available facilities,perform the test without conditioning and report the actualconditions prevailing at the time of the test. Such results maynot correspond with the results obtained after testing in thestandard atmos
20、phere for testing textiles.9. Procedure9.1 General:9.1.1 Count the number of warp yarns (ends) and fillingyarns (picks) in five randomly spaced places diagonally acrossthe width of the laboratory sampling unit. Count individualwarp ends and filling picks as single units, regardless ofwhether they ar
21、e comprised of single or plied components.9.1.2 When two yarns are laid-in together and parallel,count each yarn separately, as a single unit, regardless ofwhether it is comprised of single or plied components.9.1.3 In fancy weaves, where one or more yarns do notappear at regular, short intervals, m
22、ake count measurementsover at least one full pattern repeat of each design in the weave.9.1.4 When the coefficient of variation for five counts ishigher than 5%, make five additional counts and average theresults of the ten readings.9.2 Specific Fabric Widths:9.2.1 For fabric widths of 1000 mm (40 i
23、n) or more, makeno count closer than 150 mm (6 in) from the selvage edge, orwithin 0.5 m (0.5yd) from the end of the roll or piece.9.2.2 For fabric widths of less than 1000 mm (40 in) butgreater than 125 mm (5 in), make no count closer than onetenth of the width of the fabric, or within 0.5 m (0.5 y
24、d) fromthe end of the roll or piece.9.3 Specific Fabric Counts9.3.1 For fabrics containing less than 1 yarn per mm (25yarns per in), count the number of warp yarns (ends) over a 75mm (3 in.) width, in five randomly selected places across thewidth of the laboratory sampling unit, and count the number
25、 offilling yarns (picks) over a 75 mm (3 in.) length in fiverandomly selected places along the length of the laboratorysampling unit.9.3.1.1 When the coefficient of variation for five counts in a75 mm (3 in.) width is higher than 5%, discard those readingsand make five fresh counts over a 125 mm (5
26、in.) width.9.3.1.2 For fabrics containing 1 yarn per mm (25 yarns perin) or higher, count the number of warp yarn (ends) over 25mm (1 in.) of width in five different, randomly selected placesacross the width of the laboratory sampling unit, and count thenumber of filling yarns (picks) over a 25 mm (
27、1 in) length infive different, randomly selected places along the length of thelaboratory sampling unit.9.4 Count by Raveling Options When individual yarnscannot be readily distinguished for counting in a fabric, one ofthe two alternative options shown below may be used.9.4.1 Ravel a piece of fabric
28、 parallel to the direction to becounted, obtain a straight edge, then ravel and count the yarnsin a 25 mm (1 in) strip. For example, cut a strip of fabric fromeach randomly selected place, approximately 35 mm (1.5 in)wide, and of practical length parallel to the yarns to be counted.Then ravel each s
29、trip to give a testing width of 25 mm (1 in)by removing an approximately equal number of yarns fromeach side, prior to counting.9.4.2 Make a straight cut through the fabric across the yarnsto be counted. Place a ruler along the cut edge and mark off a25 mm (1 in) length. Count the number of yarns pr
30、otrudingbetween the two marks. If possible, ravel a yarn or two, toensure that only protruding yarns are being counted.10. Calculation10.1 Calculate the average of all warp end counts made forthe warp direction to the nearest individual yarn for each rolland for the lot.10.2 Calculate the average of
31、 all filling pick counts made forthe filling direction to the nearest individual yarn for each rolland for the lot.10.3 When requested, calculate the thread count of thefabric as the sum of the warp end and filling pick counts to thenearest whole number for each roll and for the lot.11. Report11.1 S
32、tate that the specimens were tested as directed in TestMethod D 3775. Describe the material or product sampled andthe method of sampling used.11.2 Report the following information:11.2.1 Average number of warp yarns (ends) and fillingyarns (picks) per 25 mm (1 in.) calculated to the nearestindividua
33、l yarn; when stating the count for the fabric, show thewarp yarn (end) count first followed by the filling yarn (pick)count for each roll and for the lot. For example:Count 5 100 3 40 or 100 by 40NOTE 3The result is to be read as “one hundred by forty” not as 4000.D 3775 07211.2.2 Thread count for e
34、ach roll and for the lot, whenrequested,11.2.3 Size of the pattern repeat, size of each designcomponent in the pattern, and the total yarns in each measuredcomponent for fabrics having fancy weaves,11.2.4 Atmospheric conditions under which the tests wereconducted and whether the specimens were condi
35、tioned asdirected in Practice D 1776.12. Precision and Bias12.1 SummaryIn comparing two averages of five obser-vations when measuring the warp end or filling pick count ofa woven fabric, the difference should not exceed about 0.42ends or picks/in. in 95 out of 100 cases when all theobservations were
36、 taken by the same well-trained operatorusing the same piece of equipment and specimens randomlydrawn from the same sample of material. Larger differences arelikely under all other circumstances.12.2 Interlaboratory Test Data4An interlaboratory testwas run in 1981 in which randomly drawn specimens o
37、f fourmaterials were tested in each of four laboratories. Two opera-tors in each laboratory each tested two specimens of eachmaterial for both warp end count and filling pick count. Thefirst fabric was a 65 % polyester and 35 % cotton seersuckertype basket weave. The second fabric was a 65 % polyest
38、er and35 % cotton gingham check. The third fabric was an 88 %cotton and 12 % polyester corduroy. The fourth fabric was a100 % cotton denim. Warp end counts ranged from about 50 to130 ends/in., and filling pick counts ranged from about 50 to125 picks/in. The components of variance for warp end counta
39、nd for filling pick count expressed as standard deviations werecalculated to be as follows:Counts Single-OperatorComponentWithin-LaboratoryComponentBetween-LaboratoryComponentSingle Material Comparisons:Warp End or Filling Pick Counts 0.337 0.000 0.458Multi-material Comparisons5:Warp End Counts 0.55
40、1 0.000 0.383Filling Pick Counts 0.000 0.000 0.736NOTE 4The square roots of the components are being reported toexpress the variability in the appropriate unit of measure rather than as thesquare of those units of measure.12.3 PrecisionFor the components of variance reported in12.2, two averages of
41、observed values should be consideredsignificantly different at the 95 % probability level if thedifference equals or exceeds the critical differences in Table 1.NOTE 5The tabulated values of the critical differences should beconsidered to be a general statement, particularly with respect to between-
42、laboratory precision. Before a meaningful statement can be made abouttwo specific laboratories, the amount of statistical bias, if any, betweenthem must be established with each such comparison being based onrecent data obtained on specimens taken from a lot of material of the typebeing evaluated so
43、 as to be as nearly homogeneous as possible and thenrandomly assigned in equal numbers to each of the laboratories.12.4 BiasTest Method D 3775 for counting warp ends andfilling picks in woven fabrics has no known bias and is used asa referee method.13. Keywords13.1 construction; fabric; filling pick
44、 count; warp end count;wovenASTM 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 riskof infr
45、ingement 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 this standa
46、rd 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 shouldmake your vie
47、ws 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 contacti
48、ng 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).4Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR: D131067.5The single-operator com
49、ponents for multi-material comparisons are in additionto the single-operator components for single-material comparisons and are notreduced by replication.TABLE 1 Critical Differences for the Conditions Noted, 95 %Probability Level, Ends or Picks/in.ANumber of Observationsin EachAverageSingle-OperatorPrecisionWithin-LaboratoryPrecisionBetweenLaboratoryPrecisionSingle-material Comparison (warp end or filling count)1 0.93 0.93 1.585 0.42 0.42 1.3410 0.30 0.30 1.3020 0.21 0.21 1.29Multi-material Comparison (warp end count only)1 1.79 1.79 2.085 1.58 1.58 1.9110 1.56
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