1、Designation: D7410 07 (Reapproved 2012)Standard Practice forQualification of Cotton Classification Instruments for CottonMarketing1This standard is issued under the fixed designation D7410; the number immediately following the designation indicates the year oforiginal adoption or, in the case of rev
2、ision, 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 practice provides two options for the qualificationof cotton classification instruments: optio
3、n 1, newly installedcotton classification instrumentation, or option 2, annual veri-fication of cotton classification instrumentation using evalua-tion cottons, trash evaluation images, and color evaluation fibersamples for the fiber measurements of micronaire reading,upper half mean length, uniform
4、ity index, breaking tenacity(strength), Rd (color reflectance), +b (color yellowness), per-cent area (trash), and particle count (trash).1.2 This practice covers the technical requirements to vali-date the consistency of data reported by a cotton classificationinstrument.1.2.1 The practice can be us
5、ed when new equipment isinstalled or it can be used to perform annual verification forconsistency of reported data.1.2.2 The practice can be used to qualify cotton classifica-tion instruments using evaluation cottons, trash evaluationimages, and color evaluation fiber samples. These data can beused
6、for fiber measurements of micronaire reading, upper halfmean length, uniformity index, strength, color reflectance, andtrash.1.3 The values stated in English units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.4 This standard does not purport to address
7、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 R
8、elating to TextilesD1776 Practice for Conditioning and Testing TextilesD2495 Test Method for Moisture in Cotton by Oven-DryingD7139 Terminology for Cotton Fibers2.2 Other Documents:Guidelines for HVI Testing, July 2001, United States De-partment of Agriculture (USDA), Agricultural MarketingService (
9、AMS), Cotton Program, 3275 Appling Road,Memphis TN 38133 http:/www.ams.usda.gov/cotton/cnpubs.htmUSDA The Classification of Cotton, April 2001, Agricul-tural Handbook; United States Department of Agriculture,Agricultural Marketing Service, Cotton Program, 3275Appling Road, Memphis TN 38133 http:/www
10、.ams.usda.gov/cotton/cnpubs.htm3. Terminology3.1 The following terms are relevant to this standard:3.1.1 +b (color yellowness)3.1.2 breaking tenacity (strength)3.1.3 micronaire reading3.1.4 particle count (trash)3.1.5 percent area (trash)3.1.6 rd (color reflectance)3.1.7 uniformity index3.1.8 upper
11、half mean length3.2 Definitions:3.2.1 color evaluation fiber samples, nas established byUnited States Department of Agriculture (USDA), cottonsamples based upon USDA established standard values for Rd(color reflectance) and +b (color yellowness).3.2.2 cotton classification instrument, nan integrated
12、 in-strument utilized for the classification of cotton that measuresmicronaire reading, upper half mean length, uniformity index,breaking tenacity (strength), Rd (color reflectance), +b (coloryellowness), percent area (trash) and particle count (trash).3.2.3 evaluation cottons, nas established by Un
13、ited StatesDepartment of Agriculture (USDA), cottons that have estab-lished standard values for micronaire reading, upper half meanlength, uniformity index and breaking tenacity (strength).3.2.4 micronaire-specific evaluation cottons, nas estab-lished by United States Department of Agriculture (USDA
14、),cottons that have established standard values for micronairereading.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1, 2012. Published August 2012. Originallyapproved in
15、2007. Last previous edition approved in 2007 as D741007. DOI:10.1520/D7410-07R12.2For 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
16、 onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3.2.5 trash evaluation images, nas established by UnitedStates Department of Agriculture (USDA), photographic im-ages of reference cottons with established standard
17、values forpercent area (trash) and particle count (trash).3.3 For all terminology related to cotton fibers, see Termi-nology D7139.3.4 For all terminology related to textiles, see TerminologyD123.4. Summary of Practice4.1 The cotton classification instrument shall perform aseries of tests on evaluat
18、ion cottons, trash evaluation images,and color evaluation fiber samples that shall meet establishedcriteria for instrument qualification.5. Significance and Use5.1 The purpose of this practice is to provide guidingprinciples for the use of evaluation cottons and evaluationsamples for the qualificati
19、on of cotton classification instru-ments.5.2 The cotton classification instruments qualified under thispractice shall be capable of testing the fiber properties ofmicronaire reading, upper half mean length, uniformity index,breaking tenacity (strength), Rd (color), +b (color), percentarea (trash) an
20、d particle count (trash).5.3 This practice provides guidelines for users of cottonclassification instruments to perform standardized testing thatwill ensure that test results are within acceptable tolerances(see tables below) for the marketing of cotton bales.5.4 A test of the upper half mean length
21、, uniformity indexand breaking tenacity (strength) shall consist of an average oftwo (2) specimens that are prepared by an automatic mechani-cal sampler.5.5 A test of the color and trash shall consist of an averageof four (4) measurements with a 90 degree rotation of the colorevaluation fiber sample
22、s between measurements on eachsample.5.6 The micronaire test shall consist of a single measure-ment.6. Apparatus and Materials6.1 Cotton Classification Instrument:6.1.1 The precision of measurement for each property shallbe as follows: micronaire to the nearest hundredth, upper halfmean length to th
23、e nearest thousandth, uniformity index to thenearest tenth, breaking tenacity to the nearest tenth, Rd (colorreflectance) to the nearest tenth, +b (color yellowness) to thenearest hundredth, percent area (trash) to the nearest hundredthand particle count (trash) to the nearest whole number.6.2 Refer
24、ence Materials:6.2.1 The evaluation cottons, micronaire-specific evaluationcottons, trash evaluation images, and color evaluation fibersamples that shall be utilized for this practice can be obtainedfrom the USDA, AMS, Cotton Programs Standardization andEngineering Branch. The contact information is
25、 providedbelow.USDA, AMS, Cotton ProgramStandardization and Engineering Branch3275 Appling Road, Room #5Memphis, TN 38133 USAhttp:/www.ams.usda.gov/cotton/phone: 901-384-3030 / fax: 901-384-30326.2.2 Evaluation CottonsA set of eight (8) evaluationcottons that represents a range in upper half mean le
26、ngth. Inaddition the evaluation cottons will contain a range for themeasurements of micronaire reading, uniformity index, andbreaking tenacity.6.2.3 Color Evaluation Fiber Samples (Option 1, NewlyInstalled)A set of twelve (12) color evaluation fiber samplesthat represent a range in Rd and +b.6.2.4 C
27、olor Evaluation Fiber Samples (Option 2, AnnualVerification)A set of six (6) color evaluation fiber samplesthat represent a range in Rd and +b.6.2.5 Trash Evaluation Images (Option 1, NewlyInstalled)A set of twelve (12) trash evaluation images thatrepresent a range in percent area and particle count
28、.6.2.6 Trash Evaluation Images (Option 2, AnnualVerification)A set of six (6) trash evaluation image thatrepresent a range in percent area and particle count.7. Conditioning7.1 Condition the cotton samples a minimum of 48 hoursaccording to the temperature and relative humidity levels asspecified in
29、Practice D1776 (21 6 1C (70 6 2F) and65 6 2 %).7.2 Moisture content (dry basis) measured by resistancetechnique referenced to oven method Test Method D2495 shallbe within 6.75 to 8.25 %.NOTE 1This range covers the equilibrium moisture content range forall cottons.8. Calibration8.1 The cotton classif
30、ication instrument shall be calibratedusing USDA calibration materials as specified according to theinstrument manufacturer instructions.OPTION 1NEW INSTRUMENT EVALUATION9. Procedure9.1 The evaluation process for the measurements of mi-cronaire reading, upper half mean length, uniformity index andbr
31、eaking tenacity shall consist of testing eight evaluationcottons of varying levels. A total of eight test replications shallbe performed on each of the eight cottons. A completeevaluation shall consist of a total of 64 tests for micronairereading, upper half mean length, uniformity index and breakin
32、gtenacity.9.2 The evaluation process for the individual measurementof micronaire shall consist of testing six micronaire-specificevaluation cottons of varying levels. Eight test replicationsshall be performed on each of the six cottons for a total of 48tests.9.3 The evaluation process for the color
33、measurement shallconsist of testing twelve color evaluation fiber samples. Eighttest replications shall be performed on twelve various fibersamples for a total of 96 tests for color Rd and color +b.9.4 The evaluation process for the trash measurement shallconsist of testing twelve trash evaluation i
34、mages. Eight testD7410 07 (2012)2replications shall be performed on twelve various images for atotal of 96 tests for trash percent area and trash particle count.9.5 The test data shall be evaluated for differences andstandard deviation tolerances for micronaire reading, upperhalf mean length, unifor
35、mity index, breaking tenacity, Rd, +b,percent area and particle count.9.5.1 The data evaluation for the measurements of mi-cronaire reading, upper half mean length, uniformity index,and breaking tenacity will be done as follows:9.5.1.1 Data from the eight replication tests are used tocalculate the i
36、ndividual measurement averages for each of theevaluation cottons. The difference tolerances in Table 1 repre-sent the allowable difference between the average measuredvalue and the standard value for each measurement of theevaluation cottons. The evaluation fails if the differencetolerances are exce
37、eded for more than one evaluation cotton forany measurement.9.5.1.2 Data from the eight replication tests are used forcalculating the individual measurement standard deviations foreach of the evaluation cottons. The average standard deviationfor each measurement is calculated by using the individual
38、standard deviations from each of the evaluation cottons. Thestandard deviation tolerances in Table 1 represent the allowableaverage standard deviations acceptable for each measurement.The evaluation fails if any average standard deviation exceedsthe standard deviation tolerances in Table 1.9.5.2 The
39、 data evaluation for the individual measurement ofmicronaire reading will be done as follows:9.5.2.1 Data from the eight replication tests are used tocalculate the individual measurement averages for each of themicronaire-specific evaluation cottons. A failure of the mi-cronaire evaluation test resu
40、lts if any of the six averagemicronaire measurements exceeds the difference tolerance inTable 2 or if the average standard deviation exceeds thestandard deviation tolerance provided in Table 2.9.5.3 The data evaluation for the measurements of Rd (colorreflectance) and +b (color yellowness):9.5.3.1 A
41、 failure of the color evaluation test results if any ofthe twelve average color measurements exceeds the differencetolerance in Table 3 or if the average standard deviationexceeds the standard deviation tolerances provided in Table 3.9.5.4 The data evaluation for the measurements of percentarea and
42、particle count (trash):9.5.4.1 A failure of the trash evaluation test results if any ofthe twelve average percent area measurements exceeds thedifference tolerance in Table 4. The difference tolerances inTable 4 represent an allowable percent area difference for eachimage which is determined by its
43、measurement level.9.5.4.2 A failure of the trash evaluation test results if any ofthe twelve average particle count measurements exceeds thedifference tolerance in Table 5. The difference tolerances inTable 5 represent an allowable particle count difference foreach tile which is determined by its me
44、asurement level.OPTION 2ANNUAL VERIFICATION10. Procedure10.1 The evaluation process for the measurements of mi-cronaire reading, upper half mean length, uniformity index andbreaking tenacity shall consist of testing eight evaluationcottons of varying levels. Each of the eight cottons shall betested
45、a total of eight times.Acomplete evaluation shall consistof a total of 64 tests for micronaire reading, upper half meanlength, uniformity index and breaking tenacity.10.2 The evaluation process for the individual measurementof micronaire reading shall consist of testing six varying levelsof micronai
46、re-specific evaluation cottons. Each of the sixcottons shall be tested eight times for a total of 48 measure-ments.10.3 The evaluation process for the rd and +b (color)measurements shall consist of testing six color evaluation fiberTABLE 1 Difference and Standard Deviation TolerancesforMicronaire Re
47、ading, Upper Half Mean Length, Uniformity Indexand Breaking TenacMeasurementsDifferenceTolerancesStandard DeviationTolerancesUpper Half Mean Length (in.) 60.018 in. 0.0124 in.Uniformity Index (%) 61.2 % 0.84 %Breaking strength (g/tex) 61.5 g per tex 1.04 g per texMicronaire reading 60.15 reading 0.1
48、04 readingTABLE 2 Difference and Standard Deviation Tolerancesfor MicronaireMeasurementsDifferenceTolerancesStandard DeviationTolerancesMicronaire reading 6 0.10 reading 0.07 readingTABLE 3 Difference and Standard Deviation Tolerances for Rdand +b MeasurementsMeasurementsDifferenceTolerancesStandard
49、 DeviationTolerancesRd (color reflectance) 61.0 % 0.74 %+b (color yellowness) 60.5 unit 0.34 unitTABLE 4 Difference Tolerances for Percent Area (Trash)Percent Area ImageMeasurement LevelsDifferenceTolerances0.00 to 0.14 60.02 %0.15 to 0.34 60.03 %0.35 to 0.54 60.05 %0.55 to 0.84 60.07 %0.85 to 1.14 60.09 %1.15 to 1.74 60.11 %1.75 to 2.24 60.14 %TABLE 5 Difference Tolerances for Particle Count (Trash)Particle Count ImageMeasurement LevelsDifferenceTolerances0to5 616to15 6216 to 20 6321 to 30 6431 to 40 6541 to 50 6651 to 65 6766 to 90 610D7410 07 (2012)3samples. T
