1、Designation:D800715Standard 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
2、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 m
3、achines and includesingle-as well as double-knit fabric categories.Typical fabricsin the single-knit category include jersey and single-pique;typical fabrics in the double-knit category are rib,interlock,and swiss pique.1.2 This test method is not applicable to warp knit fabricssuch as tricot or ras
4、chel.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
5、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 Stand
6、ards:D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD3887 Specification for Tolerances for Knitted FabricsD4850 Terminology Relating to Fabrics and Fabric TestMethodsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for C
7、onducting 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,course-in knitted fabrics,knittedfabric,and wale-in knitted fabrics.
8、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 illustratio
9、nof 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 usi
10、ng 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
11、 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 consid
12、eration 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
13、 unit distance.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 testing,takeat random the number of rolls of fabric as directed in an1This test method is
14、under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.59 on Fabric Test Methods,General.Current edition approved July 1,2015.Published September 2015.DOI:10.1520/D8007-15.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshoh
15、ocken,PA 19428-2959.United States1 applicable material specification or other agreement betweenthe purchaser and the supplier.Consider rolls of fabric to be theprimary sampling unit.7.2 Laboratory SampleAs a laboratory sample,take a fullwidth swatch at least 2 yd(2 m)long from each roll of fabricin
16、the lot sample.7.2.1 It is not necessary to cut out swatches from thelaboratory sample for each wale and course count to be taken.Consider each designated place at which wale and coursecounts are made as a test specimen.It is recommended that awale and a course count be taken at the same site on thelaboratory sample then at different locations along the lengthand across the width of the laboratory sample.7.3 When like garments or textile items represent a labora-tory sample,wale and course count
