ASTM_D_5647_-_07_2012.pdf

Designation:D564707(Reapproved 2012)Standard Guide forMeasuring Hairiness of Yarns by the Photo-ElectricApparatus1This standard is issued under the fixed designation D5647;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 guide covers the determination of the hairiness ofmost filament and spun yarn using a photo-electric sensorapparatus.It is not intended for use on novelty yarns.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 TextilesD2258 Practice for Sampling Yarn for TestingD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:broken filament,frayed,fuzzy,hairiness,loopy.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Guide4.1 A yarn is passed through a photo-electric device con-taining a light beam that is interrupted by the occurrence ofprotruding fibers or filaments.By the use of a digital volt meteror computer interface,the number of protruding fibers orfilaments of a specific length along a specified surface length ofyarn are counted and reported as hairiness.5.Significance and Use5.1 The photo-electric method for measuring the hairinessof yarns is not recommended for acceptance testing of com-mercial shipments since experience has shown that resultsobtained from machines produced by one manufacturer cannotusually be verified by machines produced by another manu-facturer.This guide is intended to increase the awareness of theuser to available techniques for measuring hairiness.In somecases the purchaser and the supplier may have to test acommercial shipment of one or more specific materials by thebest available guide though it has not been recommended foracceptance testing of commercial shipments.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 isa statistical bias between them,using competent statisticalassistance.As a minimum,test samples that are as homogenousas possible,drawn from the material from which the disparatetest results were obtained,and randomly assigned in equalnumbers to each laboratory for testing.The test results from thetwo laboratories should be compared using a statistical test forunpaired data,at a probability level chosen prior to the testingseries.If a 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.5.2 There may be a distinct difference in testing speed andtension devices of machines supplied by different manufactur-ers that may give differences in reported test results.5.3 The measurement of hairiness is important to yarnproducers.This guide is useful for process control and researchof the yarn surface design at an individual manufacturingfacility.Hairiness also is used to provide yarn processingmachine design,and indications of malfunctioning processequipment,such as rotors,doffing mechanisms,guides,andtravelers.It can be used to identify some causes of barrenessand shade variation in fabrics.1This guide is under the jurisdiction of ASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2012.Published August 2012 Originallyapproved in 1995.Last previous edition approved in 2007 as D5647 07.DOI:10.1520/D5647-07R12.2For 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 6.Apparatus6.1 Yarn Hairiness Meter3,photo-electric type measuringhead,equipped with digital volt meter or computer interfacingcapable of counting the number of protruding fibers or brokenfilaments of a specific length along the surface of a yarn ofknown length,preferably at a measuring height of 1 mm.6.2 Yarn Take-Up Device,capable of winding yarn atvariable speeds,and preferably a means for obtaining 30m/min.7.Sampling and Number of Specimens,Suggested7.1 Lot