ASTM_D_4604_-_95.pdf

Designation:D 4604 95Standard Test Methods forMeasurement of Cotton Fibers by High Volume Instruments(HVI)(Motion Control Fiber Information System)1This standard is issued under the fixed designation D 4604;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover procedures for the operationof several instruments measuring various properties of cottonfibers;specifically micronaire,color,trash content,length,length uniformity,strength,and fiber elongation.These instru-ments are connected through a computer communicationsnetwork and collectively are known as the Motion Control HVIFiber Information System(See Fig.1).2These methods areapplicable to loose cotton fibers taken from raw or partiallyprocessed cotton or some types of cotton wastes.1.1.1 The micronaire reading of loose cotton fibers isdetermined by measuring the resistance of a“plug”of cottonfibers to air flow under prescribed conditions.1.1.2 The measurement of length and length uniformity ismade by an air flow measuring instrument outputting a voltagedirectly proportional to the amount of fiber in the preparedspecimen at a given distance from the base of the prepared testbeard,which is held in a clamp.1.1.3 The measurements of tensile strength or breakingtenacity and elongation are made by an instrument in which thefibers are clamped between jaws with18-in.(3.2-mm)spacing.A strain-gage device is used to measure breaking force,and adisplacement measuring device is used to determine the fiberelongation at breaking load.1.1.4 The measurement of the color of raw cotton is done bymeans of a cotton color meter of the Nickerson-Hunter type.Itcan be used to measure color of any type of raw cotton.1.1.5 The measurement of the surface trash content of rawcotton is accomplished through optical analysis of the sampleby a computer governing the scanning action of the samplethrough a video camera.1.2 These test methods may exhibit shifts in the levels of theinstrument outputs depending on the stage of processing atwhich the cotton fiber exists for testing.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are for informa-tion only;the conversion may be approximate.1.4 This standard contains the following sections:SectionsScope1Referenced Documents2Terminology3Sampling4Conditioning5Micronaire Method6-11Length and Length Uniformity Method12-20Strength and Elongation Determination Method21-29Color and Trash Determination Method30-34Calculations35Report36Precision and Bias37-39Keywords401.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific precau-tionary statements are given in Note 6 and Section 16.2.Referenced Documents2.1 ASTM Standards:D 123 Terminology Relating to Textiles3D 1441 Practice for Sampling Cotton Fibers for Testing3D 1445 Test Method for Breaking Strength and Elongationof Cotton Fibers(Flat Bundle Method)3D 1448 Test Method for Micronaire Reading of CottonFibers3D 1776 Practice for Conditioning Textiles for Testing3D 2253 Test Method for Color of Raw Cotton Using theNickerson-Hunter Cotton Colorimeter3D 3025 Practice for Standardizing Cotton Fiber Test Resultsby Use of Calibration Cotton Standards33.Terminology3.1 Definitions:3.1.1 breaking tenacity,nthe tenacity corresponding tothe breaking load,for example,grams-force per tex or grams-force per denier.3.1.2 calibration cotton standards,ncotton samples takenfrom a blended bulk source on which fiber properties have beendetermined under the International Calibration Cotton Stan-dards Program.3.1.2.1 DiscussionCurrently there are ten such cottons,1These test methods are under the jurisdiction of ASTM Committee D-13 onTextiles and are the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved May 15,1995.Published October 1995.Originallypublished as D 4604 86.Last previous edition D 4604 86.2Equipment is available from Motion Control,Inc.,P.O.Box 29218,2615Brenner Dr.,Dallas,TX 75220.3Annual Book of ASTM Standards,Vol 07.01.1Copyright ASTM,100 Barr Harbor Drive,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.which cover the range of the micronaire scale.43.1.3 cotton color diagram,na diagram showing the colorranges of standards officially established by the U.S.Depart-ment of Agriculture for the various grades of cotton in relationto scales of reflectance,Rd,on th