1、Designation:D240207(Reapproved 2012)Standard Test Method forWater Retention of Textile Fibers(Centrifuge Procedure)1This standard is issued under the fixed designation D2402;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 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 measurement of waterretention of man-made and natural fibers as staple,tow,orfilament and spun
3、 yarns.It is intended to give a measure of theamount of water which cannot be removed from thoroughlywetted fiber solely by mechanical means as applied by cen-trifugal force(see 3.2).1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is therespo
4、nsibility 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 specificprecautionary statements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD629
5、Test Methods for Quantitative Analysis of TextilesD2258 Practice for Sampling Yarn for TestingD3333 Practice for Sampling Manufactured Staple Fibers,Sliver,or Tow for TestingD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to
6、Terminology D4849.3.1.1 The following terms are relevant to this standard:moisture pick-up,water retention.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 A specimen is thoroughly wetted-out by immersion,centrifuged for 5 min at an acceleration
7、of 9800 m/s2andweighed wet.Then,the wet specimen is dried and reweighed.Water retention is calculated and reported as a percentage ofthe dry mass.5.Significance and Use5.1 This test method for testing for water retention of fibersafter centrifuging is not recommended for acceptance testing ofcommerc
8、ial shipments because the test is more appropriate fordevelopment and research.However,if the test is to be used foracceptance testing,comparative tests as described in 5.1.1 areadvised.5.1.1 In the case of a dispute arising from differences inreported test results using Test Method D2402 for accept
9、ancetesting of commercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if statisti-cal biases exist between their laboratories.As a minimum,thetwo parties should take a group of test specimens that are ashomogeneous as possible and that are from a lot of ma
10、terial ofthe type in question.The test specimens should then berandomly assigned in equal numbers to each laboratory fortesting.The average results from the two laboratories should becompared using the Students t-test for unpaired data with anacceptable probability level chosen by the two parties wh
11、iledesigning the test program.If the analysis shows a bias,itscause must be found and corrected,or the purchaser andsupplier must agree to interpret future test data with consider-ation for the known bias.5.2 The amount of water retained by a fiber mass increaseswith an increase in the hydrophilic t
12、endency of the fiber.Thusthe data obtained can be used to indicate the following:5.2.1 Differences in water retention between the variousman-made and natural fibers,5.2.2 Degree of cross-linking in cellulosic fibers,5.2.3 Damage incurred by wool and silk fibers due toalkaline processing,and5.2.4 Per
13、sistence of water-repellent treatments.6.Apparatus6.1 Stationary Coarse Comb3,approximately 63 mm longand having needles approximately 12.5 mm long and spaced 19needles to the 10 mm,or1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subc
14、ommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1965T Last previous edition approved in 2007 as D2402 07.DOI:10.1520/D2402-07R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at
15、serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Combs meeting these requirements may be obtained from Alfred Suter Co.,Inc.,Prel Plaza,Orangeburg,NY 10962.Copyright ASTM International,100 Barr Harbor Drive,PO Box C7
16、00,West Conshohocken,PA 19428-2959.United States1 6.2 Hand Cards.6.3 Centrifuge,4with trunnions capable of holding at least 2tube assemblies.The centrifuge must be capable of operatingto develop an angular speed that will produce a radial accel-eration of 9800 m/s2(1000 g)on the specimen within 5 min.6.4 Tube Assemblies,each consisting of a 15-mL,polypropylene,centrifuge tube with draining holes,shell andsupport wire(see Fig.1).6.5 Timer,suitable for controlling immersion time andcentrifuge time
