ASTM_D_1770_-_94_2012e1.pdf

Designation:D177094(Reapproved 2012)1Standard Test Method forNeps,Vegetable Matter,and Colored Fiber in Wool Top1This standard is issued under the fixed designation D1770;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.1NOTEThe terminology section was updated in July 2012.1.Scope1.1 This test method covers the determination of the numberof neps and pieces of vegetable matter by size classes,and thenumber of colored fibers,in 15 g samples of wool top.21.2 This test method is applicable to wool top in any form.NOTE1For the determination of number of neps per specified mass ofcotton samples,refer to Test Method D1446.1.3 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:3D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD1446 Method of Test for Number of Neps in CottonSamples(Withdrawn 1977)4D4845 Terminology Relating to Wool2.2 ASTM Adjuncts:5Nep Scale Standard(1 Photo),Vegetable Matter Standard(1Photo)3.Terminology3.1 For all terminology related to D13.13,refer to Termi-nology D4845.3.1.1 The following terms are relevant to this standard:colored fiber,in wool top;laboratory sample;lot,in acceptancetesting;nep;test specimen,for wool top;top,in wool;vegetable matter.3.1.2 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Method4.1 Four test specimens are taken and examined in accor-dance with specified procedures.Each observed nep or piece ofvegetable matter is classified by size,by visual comparisonwith a specified standard size chart.The numbers of each classof neps and class of vegetable matter pieces,and the number ofcolored fibers,are recorded for each specimen.From these datathe average counts per specimen of 15 g are calculated.5.Significance and Use5.1 Test Method D1770 for the determination of neps,vegetable matter,and colored fiber may be used for theacceptance testing of commercial shipments of wool top butcaution is advised because the between-laboratory precision isknown to be poor.Comparative tests as directed in 5.1.1 maybe advisable.5.1.1 In case of a dispute arising from differences inreported test results when using Test Method D1770 foracceptance testing of commercial shipments,the purchaser andthe supplier should conduct comparative tests to determine ifthere is a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before the testing is begun.If a bias is found,eitherits cause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results in the light ofthe known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1960.Last previous edition approved in 2006 as D1770 94(2006).DOI:10.1520/D1770-94R12E01.2For additional information,reference may be made to“Neps in Worsted Sliver,”Wool Science Review,Vol 22,March 1963,pp.2838.3For 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.4The last approved version of this historical standard is referenced onwww.astm.org.5Original prints of these illustrations are available from ASTM InternationalHeadquarters.Order Adjunct No.ADJD1770 for Nep Scale Standard and VegetableMatter Standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Apparatus6.1 Nep Scale Standard,see Fig.1 and ADJD1770.56.2 Vegetable Matter Standard,see Fig.2 and ADJD1770.56.3 Examination Surfaces,consisting of a dark surfaceilluminated from above for nep test and a white surfaceilluminated from above for vegetable matter and colored fibertests.Alternatively,a white translucent surface with under-lighting may be used for all tests.When a transluce