ASTM_D_2646_-_11.pdf

Designation:D264611Standard Test Methods forBacking Fabric Characteristics of Pile Yarn Floor Coverings1This standard is issued under the fixed designation D2646;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 These test methods cover the procedures listed asfollows for testing woven,knitted and nonwoven backingfabrics designed for use in the manufacture of pile yarn floorcoverings.The procedures appear in the following order:SectionBow and Skewness of Woven Fabrics8Breaking Force of Woven and Nonwoven Fabrics15Breaking Force After Tufting of Woven and Nonwoven Fabrics16Extractable Matter9Fabric Count of Woven Fabrics12Fabric Count of Knitted Fabrics13Length of Woven Fabrics11Mass per Unit Area(Weight)of Woven Fabrics14ShrinkageHot Wet Method17ShrinkageHot Dry Method18Width of Woven Fabrics101.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.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 TextilesD2257 Test Method for Extractable Matter in TextilesD3773 Test Methods for Length of Woven FabricD3774 Test Method for Width of Textile FabricD3775 Test Method for Warp(End)and Filling(Pick)Countof Woven FabricsD3776 Test Methods for Mass Per Unit Area(Weight)ofFabricD3882 Test Method for Bow and Skew in Woven andKnitted FabricsD3887 Specification for Tolerances for Knitted FabricsD5034 Test Method for Breaking Strength and Elongation ofTextile Fabrics(Grab Test)D5684 Terminology Relating to Pile Floor Coverings3.Terminology3.1 For definitions of terms relating to Pile Floor Coverings,D13.21,refer to Terminology D5684.3.1.1 The following terms are relevant to this standard:backing fabric,carpet,dents per unit width,extractable matter,finished,finished pile yarn floor covering,floor covering,nonwoven fabric,pile,pile yarn floor covering,shrinkage,textile floor covering,tufted fabric,wale,wires per unit width.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Methods,General4.1 A summary of the directions prescribed for the determi-nation of specific properties is stated in the appropriate sectionsof specific test methods.5.Significance and Use5.1 These test methods may be used for acceptance testingof commercial shipments;however,caution is advised becauseinformation about between interlaboratory precision is incom-plete.Comparative tests as directed in 5.1.1 may be advisable.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isstatistical bias between them using competent statistical assis-tance.As a minimum,use test samples for such comparativetests that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in the disparateresults during initial testing,and that are randomly assigned inequal numbers to each laboratory for testing.The test resultsfrom the laboratories should be compared using statistical testfor unpaired data at a probability level chosen prior to thetesting series.If a bias is found either its cause must be foundand corrected,or future test results for that material must beadjusted in consideration of the known bias.1These test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.21 on Pile FloorCoverings.Current edition approved Aug.1,2011.Published September 2011.Originallyapproved in 1967.Last previous edition approved in 2005 as D2646 05.DOI:10.1520/D2646-11.2For 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 to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 These test methods are useful to evaluate quality andcost control during the manufacture of pile yarn floor covering.5.3 The significance and uses of particular properties andtest methods are discussed in the appropriate sections of thespecified test methods.6.Sampling6.1 Lot SampleAs a lot sample for acceptance testing,takeat random the number of rolls or pieces,