ASTM D2612-1999(2005) Standard Test Method for Fiber Cohesion in Sliver and Top in Static Tests《静态试验条件下纱条和毛条中纤维粘附力的标准试验方法》.pdf
《ASTM D2612-1999(2005) Standard Test Method for Fiber Cohesion in Sliver and Top in Static Tests《静态试验条件下纱条和毛条中纤维粘附力的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2612-1999(2005) Standard Test Method for Fiber Cohesion in Sliver and Top in Static Tests《静态试验条件下纱条和毛条中纤维粘附力的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 2612 99 (Reapproved 2005)Standard Test Method forFiber Cohesion in Sliver and Top (Static Tests)1This standard is issued under the fixed designation D 2612; 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes the measurement of fibercohesion as the force required to cause initial drafting in abund
3、le of fibers in sliver and top. The observed cohesive forcerequired to separate the fibers is converted to cohesive tenacitybased on the linear density of the specimen.NOTE 1For determination of fiber cohesion in dynamic tests, refer toTest Method D 4120.1.2 The values stated in SI units or other un
4、its (in parenthe-ses) are to be regarded separately as standard. The values ineach system are not exact equivalents; therefore, each systemshall be used independently of the other without any combi-nation.1.3 This standard does not purport to address all of thesafety concerns, if any, associated wit
5、h 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:2D76 Specification for Tensile Testing Machines for TextilesD 123 Te
6、rminology Relating to TextilesD 1776 Practice for Conditioning Textiles for TestingD 2258 Practice for Sampling Yarn for TestingD 3333 Practice for Sampling Man-Made Staple Fibers,Sliver, or Tow for TestingD 4120 Test Method for Fiber Cohesion in Roving, Sliver,and Top in Dynamic TestsD 4848 Termino
7、logy for Force and Deformation Propertiesof Textiles3. Terminology3.1 Definitions:3.1.1 fiber cohesion, nthe resistance to separation offibers in contact with one another.3.1.1.1 DiscussionThis resistance is due to the combinedeffects of the surface characteristics, length, crimp, finish, andlinear
8、density of the fibers. Cohesion should not be confusedwith adhesion or sticking together as in a glutinous substance.3.1.2 cohesive force, n in sliver and top testing, the forcerequired to overcome cohesion of a test specimen held in afixed position between two slowly separating clamps.3.1.2.1 Discu
9、ssionIn static tests, cohesive force is mea-sured while a test specimen is held in fixed position betweentwo slowly separating clamps. In dynamic tests, cohesive forceis the force required to maintain drafting in a roving, sliver, ortop.3.1.3 For definitions of other terms related to force anddeform
10、ation in textiles, refer to Terminology D 4848. Fordefinitions of other textile terms used in this test method, referto Terminology D 123.4. Summary of Test Method4.1 The test procedure is based upon the measure of themaximum resisting force when a length of sliver or top ispulled in an axial direct
11、ion. Specified lengths of sliver or topare placed in the clamps of a tensile testing machine and themaximum force developed during separation of the clamps isrecorded. The cohesive tenacity is calculated in terms of theforce per unit linear density of the tested specimen. Thecohesive tenacity is con
12、sidered a measure of the cohesion ofthe fibers in the specimen and is reported in micronewtons/tex(gf/denier).5. Significance and Use5.1 Fiber cohesion is related to the resistance to draftingencountered during textile processing and is affected by such1This test method is under the jurisdiction of
13、ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarn Test Methods,General.Current edition approved April 1, 2005. Published July 2005. Originallyapproved in 1967. Last previous edition approved in 1999 as D2612 99.2For referenced ASTM standards, visit the AST
14、M 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.TABLE 1 Specimens Required in the Users Laboratory UnderConditions of Unknown Variability Based on Estimat
15、edCoefficients of Variation, % of the AverageFiberAverage Number ofSpecimensBasisACotton 14 n =11.2Man-made 48 n = 21.0Wool 25 n = 15.0BAThe values for n are somewhat larger than will usually be found in practice.BThis value is based on the opinions of knowledgable users.1Copyright ASTM Internationa
16、l, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.fiber properties as surface lubrication, linear density, surfaceconfiguration, fiber length, and crimp.5.2 Fiber cohesion is affected by the alignment of fiber insliver in addition to the factors listed in 5.1. A
17、half turn of twistin a 140-mm specimen has been found to increase the breakingforce by 30 % and a full turn by 60 %. For this reason, caremust be exercised in precise mounting of specimens.5.3 For the same reason given in 5.2, card sliver gives adifferent breaking tenacity than draw sliver of the sa
18、me fiber.Fibers are more aligned in draw sliver, resulting in lowercohesion.5.4 Increasing the gage length of test specimens reduces thebreaking force and apparent cohesion.5.5 The mathematical relationship between the observedvalue for breaking tenacity and processability has not beenestablished, b
19、ut the observed values can be used in comparingvarious fiber characteristics on a relative basis.5.6 This method for measuring fiber cohesion in sliver ortop (static tests) is not recommended for acceptance testingbecause it is an empirical method which must be followedexplicitly. Results obtained u
20、nder other conditions cannot beexpected to be comparable.5.6.1 In some cases, the purchaser and the supplier mayhave to test a commercial shipment of one or more specificmaterials by the best available method, even though themethod has not been recommended for acceptance testing ofcommercial shipmen
21、ts. In case of dispute arising from differ-ences in reported test results when using this test method foracceptance testing of commercial shipments, the purchaser andsupplier should conduct comparative tests to determine if thereis a statistical bias between their laboratories. Competentstatistical
22、assistance is recommended for the investigation ofbias. As a minimum, the two parties should take a group of testspecimens, which are as homogeneous as possible and whichare from a lot of material of the type in question. Testspecimens then should be randomly assigned in equal numbersto each laborat
23、ory for testing. The average results from the twolaboratories should be compared using appropriate statisticalanalysis and a probability level chosen by the two parties priorto testing. If a bias is found, either its cause must be found andcorrected or the purchaser and the supplier must agree toint
24、erpret future test results with consideration to the knownbias.6. Apparatus and Material6.1 Tensile Testing Machine, a constant-rate-of-specimen-extension (CRE) type, conforming to Specification D76,having adequate response characteristics to properly record theload-elongation curve of the sliver un
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