ASTM_D_8007_-_15_2019.pdf

Designation:D800715(Reapproved 2019)Standard Test Method forWale and Course Count of Weft Knitted Fabrics1This standard is issued under the fixed designation D8007;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.1.Scope1.1 This test method covers the measurement of wale andcourse counts of weft knitted fabrics.Weft knit fabrics aremade on circular or flat-bed knitting machines and includesingle-as well as double-knit fabric categories.Typical ex-amples of single-knits include jersey and single-pique fabrics;typical double-knits are rib,interlock,and swiss pique fabrics.1.2 This test method is not applicable to warp knit fabricssuch as tricot or raschel.1.3 Wale and course counts are to be reported separately.1.4 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are mathemati-cal conversions to SI units that are provided for informationonly and are not considered standard.1.5 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD3887 Specification for Tolerance for Knitted Fabrics(Withdrawn 2017)2D4850 Terminology Relating to Fabrics and Fabric TestMethodsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 For terminology related to fabrics,see TerminologyD4850.3.2 The following terms are relevant to this test method:count-in knitted fabrics,courses-in knitted fabrics,knittedfabric,and wales-in knitted fabrics.3.3 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Method4.1 The number of wales and the number of courses per unitdistance of a knitted fabric are counted using a suitable ruler,magnifying device,or digital camera system.For an illustrationof a simple knitted fabric wale and course orientation,see Fig.1.5.Significance and Use5.1 If there are differences of practical significance betweenreported test results for two laboratories(or more),compara-tive tests should be performed to determine if there is astatistical bias between them using competent statistical assis-tance.As a minimum,ensure that the test samples to be usedare as homogeneous as possible and drawn from the materialfrom which the disparate test results were obtained.The testspecimens are to be randomly assigned in equal numbers toeach laboratory for testing.The test results from the partici-pating laboratories should be compared using a statistical testfor unpaired data to a probability level chosen before initiationof the testing.If a bias is found,either its cause shall be foundand corrected,or future test results for that material shall beadjusted in consideration of the known bias.5.2 The results obtained by this test method may be used todetermine if fabrics meet the tolerances for fabric counts givenin Specification D3887.6.Apparatus6.1 Use any suitable device,such as a pick glass,ruler,microscope,or digital camera system that will allow countingby unit distance.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved July 1,2019.Published July 2019.Originally approvedin 2015.Last previous edition approved in 2015 as D8007-151.DOI:10.1520/D8007-15R19.2The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.2 The use of a stylus,pointer,or pick needle is recom-mended when using a pick glass,ruler,or if the microscopedoes not have a micrometer.7.Sampling7.1 Lot SampleAs a lot sample for acceptance testi