ASTM D1776-2004 Standard Practice for Conditioning and Testing Textiles《调理和检验织物的标准实施规程》.pdf
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1、Designation: D 1776 04Standard 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 (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This practice covers the conditioning and testing oftextiles in those
3、instances where such conditioning is specifiedin a test method. Because prior exposure of textiles to high orlow humidity may affect the equilibrium moisture pick-up, aprocedure also is given for preconditioning the material whenspecified.1.2 The values stated in either SI units or inch-pound unitsa
4、re to be regarded separately as the standard. Within the text,the inch-pound units are shown in parentheses. The valuesstated in each system are not exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in nonconformancewit
5、h the 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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to
6、 use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 578 Specification for Glass Fiber StrandsD 618 Practice for Conditioning Plastics and ElectricalInsulating Materials for TestingD 885 Test Methods for Tire Cords, Tire Cord Fabrics, andIndustrial Filament Yarns a
7、nd Cords Made from Man-Made Organic-Base FibersD 1776 Practice for Conditioning Textiles for TestingD 4920 Terminology Relating to Moisture in TextilesE 337 Test Method for Measuring Humidity With a Psy-chrometer (the Measurement of Wet- and Dry-Bulb Tem-perature)2.2 ISO Standard:ISO 139 Textiles St
8、andard Atmosphere for Conditioningand Testing33. Terminology3.1 Definitions:3.1.1 moisture content, nthat part of the total mass of amaterial that is absorbed or adsorbed water, expressed as apercentage of the total mass.3.1.1.1 DiscussionThe total mass is the original masscomprising the dry substan
9、ce plus any water present. The wordwater as used in these definitions refers to the compoundchemically 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 material.3.1.2
10、 moisture equilibrium, nthe condition reached by amaterial when it no longer takes up moisture from, or gives upmoisture to, the surrounding atmosphere.3.1.2.1 DiscussionSuperficial equilibrium with the film ofair in contact with the textile material is reached very rapidly.Moisture equilibrium can
11、be reached in a reasonable time onlyif the air to which the sample is exposed is in motion. Moistureequilibrium with the air in motion is considered to be realizedwhen successive weighings do not show a progressive changein mass greater than the tolerance established for various textilematerials.3.1
12、.3 moisture equilibrium, for preconditioning, nthemoisture condition reached by a sample or specimen afterexposure to moving air in the standard atmosphere for precon-ditioning.3.1.4 moisture equilibrium, for testing, n the conditionreached by a sample or specimen during free exposure tomoving air c
13、ontrolled at specified conditions.3.1.4.1 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
14、 not exceed that specified for thematerial being tested.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.51 on Conditioning and, Chemicaland Thermal Properties.Current edition approvedMarch 1, 2004. Published March 2004. Or
15、iginallyapproved in 1998. Last previous edition approved in 1998 as D177698.2For 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 tot he standards Document summary page onth
16、e 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 19428-2959, United States.3.1.5 precondition, vto bring a sample or specimen of atextile to
17、a relatively low moisture content (approximateequilibrium an atmosphere between 5 and 25% relative humid-ity) prior to conditioning in a controlled atmosphere for testing.3.1.6 standard atmosphere for preconditioning textiles,na set of controlled conditions having a temperature not over50C (122F), w
18、ith 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.3.1.7 standard atmosphere for testing textiles,nlaboratory conditions for testing fibers, yarns, and
19、 fabrics inwhich air temperature and relative humidity are maintained atspecific levels with established tolerances. See Table 1.3.1.7.1 DiscussionTextile materials are used in a numberof specific end use application that frequently require differenttesting temperatures and relative humidities. Spec
20、ific condi-tioning and testing of textiles for end product requirements canbe carried out using Table 1 in Practice D 1776.4. Summary of Practice4.1 Samples or specimens requiring preconditioning arebrought to a relatively low moisture content in a specifiedatmosphere. Samples or specimens requiring
21、 conditioning arebrought to moisture equilibrium for testing in the standardatmosphere for testing textiles, or when required, as shown inTable 1.5. Significance and Use5.1 The conditioning prescribed in this practice is designedto obtain reproducible results on textiles and textile products.Results
22、 of tests obtained on these materials under uncontrolledatmosphere conditions may not be comparable with each other.In general, many of the physical properties of textiles andtextile products are influenced by relative humidity and tem-perature in a manner that affects the results of the tests. Toma
23、ke reliable comparisons among different textile materialsand products, and among different laboratories, it is necessaryto standardize the humidity and temperature conditions towhich the textile material or product is subjected prior to, andduring, testing.6. Apparatus6.1 Conditioning Room or Chambe
24、r, consisting of:6.1.1 Equipment for maintaining the standard atmospherefor testing textiles throughout the room or chamber within thetolerances given in Table 1 and including facilities for circu-lating air over all surfaces of the exposed sample or specimenand6.1.2 Equipment for recording the temp
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