ASTM_D_2812_-_07_2012.pdf

Designation:D281207(Reapproved 2012)Standard Test Method forNon-Lint Content of Cotton1This standard is issued under the fixed designation D2812;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 test method covers the determination of the non-lint content of cotton using the Shirley Analyzer.The cottonmay be in the form of(1)raw stock,that is,cotton fiber that hasbeen separated from the seed by ginning;(2)partially pro-cessed cotton,such as picker lap or sliver;or(3)ginning orprocessing waste,such as obtained from ginning,opening andcleaning,picking,carding,or combing machines.1.2 This test method is especially adapted for determiningnon-lint content of cotton by use of the Shirley Analyser.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 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.For specific hazardstatements,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1441 Practice for Sampling Cotton Fibers for TestingD7139 Terminology for Cotton Fibers3.Terminology3.1 For all terminology relating to D13.11,Cotton Fibers,refer to Terminology D7139.3.1.1 The following terms are relevant to this standard:foreign matter,invisible waste,lint,lint content,non-lintcontent,visible waste.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 Aknown mass of raw cotton,partially processed cotton,or waste is fed into the machine.The machine,operating onmechanical-pneumatic principles,separates the foreign matterfrom the cotton and discharges the non-lint particles and lintinto separate chambers.4.2 The amounts of lint and non-lint recovered are calcu-lated as a percentage of the original specimen mass.5.Significance and Use5.1 This test method for testing cotton for non-lint content isconsidered satisfactory for acceptance testing of commercialshipments since it is the best available procedure for obtainingobjective data.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,ensure the test samples to be usedare as homogeneous as possible,are drawn from the materialfrom which the disparate test results were obtained,and arerandomly assigned in equal numbers to each laboratory fortesting.The test results from the two laboratories should becompared using a statistical test for unpaired data,at aprobability level chosen prior to the testing series.If a bias isfound,either its cause must be found and corrected,or futuretest results for that material must be adjusted in considerationof the known bias.5.2 This test method gives data on the non-lint content ofraw cotton which can be used as a basis for:(1)estimating thenet amount of manufactured textile product obtainable fromraw cotton;(2)predicting the quality of cotton textile products,particularly their aesthetic properties;(3)assembling andblending bales in a mix on a non-lint content basis;(4)adjusting ginning and textile processing machines for maxi-mum efficiency in cleaning lint;and(5)relating non-lintcontent of cotton to end-product quality and processing effi-ciency.6.Apparatus6.1 Testing InstrumentShirley Analyzer,commerciallyavailable non-lint testing machine operating on mechanical-pneumatic principles,described in Annex A1.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1969.Last previous edition approved in 2007 as D2812 07.DOI:10.1520/D2812-07R12.2For 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 6.2 Laboratory Balance,with a capacity of 200 g,a sensi-tivity of 0.01 g,and a pan large enough to weigh a 100-gspecimen of cotton.7.Hazards7.1 Use care in running the specimen through the machine.Spread the specimen uniformly on the feed plate so that fingersdo not have to come into contact with the feed roll.7.2 In conducting tests,the machine should