ASTM D1776-2008 Standard Practice for Conditioning and Testing Textiles.pdf
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1、Designation: D 1776 08Standard Practice forConditioning and Testing Textiles1This standard is issued under the fixed designation D 1776; 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 parenth
2、eses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the conditioning and testing oftextiles when conditioning is specified in a test method.Because prior exposure of textiles to high
3、or low humidity mayaffect moisture pick-up equilibrium, a procedure also is givenfor preconditioning the material when required.1.2 The values stated the text are in SI units. Inch-poundunits are shown in parentheses. The values stated in eachsystem are not exact equivalents; therefore, each system
4、shallbe used independently of the other. Combining values from thetwo systems may result in nonconformance to a specification.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 ap
5、pro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 618 Practice for Conditioning Plastics for TestingD 885 Test Methods for Tire Cords, Tire Cord Fabrics, an
6、dIndustrial Filament Yarns Made from ManufacturedOrganic-Base FibersD 1776 Practice for Conditioning and Testing TextilesD 4920 Terminology Relating to Conditioning, Chemical,and Thermal PropertiesD 7269 Test Methods for Tensile Testing of Aramid YarnsE 337 Test Method for Measuring Humidity with a
7、Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-peratures)2.2 ISO Standard:ISO 139 Textiles Standard Atmosphere for Conditioningand Testing33. Terminology3.1 Definitions:3.1.1 accelerated conditioning, n a process that useshumidity generation and precise temperature controls to rap-idly brin
8、g a textile to equilibrium in a standard atmosphere.3.1.1.1 DiscussionAccelerated conditioning may beachieved in closed cabinets, rooms or process lines designedsuch that equilibrium can be achieved in a much shorter time,such as 2 to 10 minutes, compared to typical conditioningtimes.3.1.2 moisture
9、content, nthat part of the total mass of amaterial that is absorbed or adsorbed water, expressed as apercentage of the total mass.3.1.2.1 DiscussionThe total mass is the original masscomprising the dry substance plus any water present. The wordwater as used in these definitions refers to the compoun
10、dchemically defined as H2O. The terms water and moisturefrequently are used interchangeably in the literature and thetrade, but the term moisture is sometimes considered to includeother volatile matter.3.1.3 moisture equilibrium, n the state of condition atextile reaches when it no longer takes up m
11、oisture from, orgives up moisture to, the surrounding atmosphere.3.1.3.1 DiscussionSuperficial equilibrium is reached veryrapidly when air comes into contact with the outer surfaces ofa textile. Moisture equilibrium can be reached in a reasonabletime only if the air to which the sample is exposed is
12、 in motion.Moisture equilibrium, with air temperature (in motion) andrelative humidity controlled to prescribed levels, is achievedwhen successive weighings do not show a progressive changein mass greater than the tolerance established for the textile.3.1.4 moisture equilibrium, for preconditioning,
13、 nthemoisture state of a textile sample(s) or specimen(s) reachedafter exposure to moving air in the standard atmosphere forpreconditioning.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.51 on Conditioning and, Chemicalan
14、d Thermal Properties.Current edition approved Aug. 1, 2008. Published October 2008. Originallyapproved in 1998. Last previous edition approved in 2004 as D 177604.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book
15、 of ASTMStandards volume information, refer tot he standards Document summary page onthe ASTM website.3Available from American National Standards Institute, 11 W. 42nd Street, 13thFloor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428
16、-2959, United States.3.1.5 moisture equilibrium, for testing, nthe state of atextile sample(s) or specimen (s) reaches after exposure tomoving air and relative humidity in selected standard atmo-spheres for conditioning and testing, when its mass does notchange the after successive weighings.3.1.5.1
17、 DiscussionFor test purposes, moisture equilib-rium must be reached by adsorption, starting from a relativelymoisture content. Moisture equilibrium for testing is consid-ered as having been reached when the rate of increase in massof a sample or specimen does not exceed that specified for themateria
18、l being tested.3.1.6 precondition, vto bring a sample or specimen of atextile to a relatively low moisture content (approximateequilibrium an atmosphere between 5 and 25% relative humid-ity) prior to conditioning in a controlled atmosphere for testing.3.1.7 standard atmosphere for preconditioning te
19、xtiles,na set of controlled conditions having a temperature not over50C (122F), with respective tolerances of 61C (62F), anda relative humidity of 5-25% 6 2 % for the selected humiditythat drying can be achieved prior to conditioning in thestandard atmosphere for testing textiles.3.1.8 standard atmo
20、sphere for testing textiles,nlaboratory conditions for testing fibers, yarns, and fabrics inwhich air temperature and relative humidity are maintained atspecific levels with established tolerances. See Table 1.3.1.8.1 DiscussionTextile materials are used in a numberof specific end use application th
21、at frequently require differenttesting temperatures and relative humidities. Specific condi-tioning and testing of textiles for end product requirements canbe carried out using Table 1 in Practice D 1776.3.1.9 For additional terms, see Terminologies D 123 andD 4920.4. Summary of Practice4.1 Samples
22、or specimens requiring preconditioning arebrought to relatively low moisture content in a specifiedatmosphere. Samples or specimen not requiring pre-conditioning are brought to moisture equilibrium (specific tofiber-content) according to the standard atmosphere for testingtextiles as shown in Table
23、1.5. Significance and Use5.1 The conditioning prescribed in this practice is designedto obtain reproducible results on textiles and textile products.Results of tests obtained on these materials under uncontrolledatmosphere conditions may not be comparable with each other.In general, many of the phys
24、ical properties of textiles andtextile products are influenced by relative humidity and tem-perature in a manner that affects the results of the tests. Tomake reliable comparisons among different textile materialsand products, and among different laboratories, it is necessaryto standardize the humid
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