1、Designation:D 5729 97(Reapproved 2004)Standard Test Method forThickness of Nonwoven Fabrics1This standard is issued under the fixed designation D 5729;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number
2、 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 covers the measurement of the thick-ness of most nonwoven fabrics.1.2 This test method applies to most nonwoven fabrics thatare
3、 treated or untreated,including those heavily sized,coatedor resin-treated.1.3 This test method may not be useful for highloft non-woven fabrics.For thickness of highloft nonwoven fabric seeTest Method D 5736.1.4 The values stated in SI units are to be regarded as thestandard.The U.S.customary units
4、(inch-pound)may beapproximate.1.5 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 p
5、rior to use.2.Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 1776 Practice for Conditioning Textiles for TestingD 5736 Test Method for Thickness of Highloft NonwovenFabrics3.Terminology3.1 Definitions:3.1.1 pressure,nthe force or load per unit area.3.1.1.1 Discussion
6、Pressure may be expressed in any ap-propriate or specified units,such as Pascals(Pa),Newtons persquare meter(N/m2),or pounds-force per square inch(psi).3.1.2 thickness,nthe distance between one surface and itsopposite.3.1.2.1 DiscussionIn textiles,the distance between theupper and lower surfaces of
7、the material,measured under aspecified pressure.Thickness is usually determined as thedistance between an anvil,or base,and a presser foot used toapply the specified pressure.3.1.3 For definitions of other textile terms used in this testmethod,refer to Terminology D 123.4.Summary of Test Method4.1 T
8、he thickness of a textile material is determined byobserving the linear distance that a movable plane is displacedfrom a parallel surface by the specimen while under a specifiedpressure.5.Significance and Use5.1 This test method is used in the trade for acceptancetesting of commercial shipments of n
9、onwoven fabrics;how-ever,caution is advised since information about between-laboratory precision is incomplete.Comparative tests as di-rected in 5.1.1 may be advisable.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of com
10、mercial shipments,the purchaser and the sup-plier should conduct comparative tests to determine if there isa statistical bias between their laboratories.Competent statis-tical assistance is recommended for the investigation of bias.As a minimum,the two parties should take a group of testspecimens th
11、at are as homogeneous as possible and that arefrom a lot of material of the type in question.Test specimensshould then be randomly assigned in equal numbers to eachlaboratory for testing.The average results from the twolaboratories should be compared using the appropriate Stu-dents t-test and an acc
12、eptable probability level chosen by thetwo parties before testing is begun.If a bias is found,either iscause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results with consid-eration to the known bias.5.2 Thickness is one of the basic physical prope
13、rties ofnonwoven fabrics.In certain industrial applications,the thick-ness may require rigid control within specified limits.Bulk andwarmth properties of nonwoven fabrics are often estimatedfrom their thickness values,and thickness is also useful inmeasuring performance characteristics,such as,befor
14、e andafter abrasion and shrinkage.1This test method is under the jurisdiction of ASTM Committee D-13 onTextiles,and is the direct responsibility of Subcommittee D13.64 on NonwovenFabrics.Current edition approved Dec.10,1997.Published August 1998.Originallypublished as D 5729 95.Last previous edition
15、 D 5729 95.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandardsvolume information,refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International,100 Barr Harbor Drive,PO B
16、ox C700,West Conshohocken,PA 19428-2959,United States.5.3 The thickness values of most nonwoven fabrics willvary considerably depending on the pressure applied to thespecimen at the time the thickness measurement is taken.In allcases,the apparent thickness varies inversely with the pressureapplied.For this reason,it is essential that the pressure bespecified when discussing or listing any thickness value.6.Apparatus6.1 Thickness Testing Gageof the dead-weight,calibratedspring force,or string gag
