ASTM_D_3775_-_12.pdf

Designation:D377512Standard Test Method forWarp(End)and Filling(Pick)Count of Woven Fabrics1This standard is issued under the fixed designation D3775;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the measurement of warp endcount and filling pick count and is applicable to all types ofwoven fabrics.NOTE1Historically,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 parentheses 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 limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD4850 Terminology Relating to Fabrics and Fabric TestMethodsD7023 Terminology Relating to Home Furnishings2.2 Other Standard:ANSI/ASQC Z1.4Inspection by Attributes33.Terminology3.1 For all terminology related to D13.59,Fabric TestMethods,General,refer to Terminology D48503.1.1 The following terms are relevant to this standard:count,end,end count,filling,pick,pick count,thread count.thread count3.2For all terminology related to Home Furnishings,referto Terminology D7023.3.3 For all other terms related to textiles,refer to Terminol-ogy D123.4.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 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 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 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 future test results for that material must beadjusted in consideration of the known bias.5.1.2 This test method is suitable for use with narrow fabricswhen the count across the total width is measured in the narrowdirection and extrapolated to the number of yarns per centime-tre or inch.6.Apparatus6.1 Use any suitable device,such as pick glass,rule andpointer,microfilm reader,or projection equipment.The use ofoptical sensing equipment may be used as agreed upon by thepurchaser and supplier.6.2 Use a scale graduated in mm(116in.)to measure thewidth of the fabric test specimen to be raveled for a count ofyarns.1This test method is under the jurisdiction of ASTM Committee D13 on FabricTest Methods,SpecificCurrent edition approved Sept.1,2012.Published October 2012.ReplacesSections 28 to 34 of Methods D1910 64(1975).Originally approved in 1979.Lastprevious edition approved in 2008 as D3775 08.DOI:10.1520/D3775-12.2For 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 tot he standards Document Summary page onthe ASTM website.3Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10036.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take at random the number of rolls of fabric 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 least 2 m(2 yd)long from each roll of fabricin the lot sample.Consider each designated place at whichwarp end counts and filling pick counts are made as a testspecimen.NOTE2For specimens not obtained as di