1、Designation:D311110Standard Test Method forFlexibility Determination of Hot-Melt Adhesives by MandrelBend Test Method1This standard is issued under the fixed designation D3111;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、of 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 determination of the flex-ibility of a hot-melt adhesive in sheet form under specific testco
3、nditions.This is a working test.Its results are useful forcomparing adhesives,not for absolute characterization ofadhesives.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of
4、 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 use.2.Referenced Documents2.1 ASTM Standards:2D907 Terminology of Adhesive
5、sE171 Practice for Conditioning and Testing Flexible BarrierPackaging3.Terminology3.1 DefinitionsMany of the terms found in this testmethod are defined in Terminology D907.3.2 Definitions of Terms Specific to This Standard:3.2.1 flexibility,nthat property of a material by virtue ofwhich it may be fl
6、exed or bowed repeatedly without undergo-ing rupture.4.Summary of Test Method4.1 Test strips of a hot-melt adhesive properly sized andconditioned,are bent 180 over a mandrel(rod).Using a freshspecimen for each test,the test is repeated with smallerdiameter mandrels until the adhesive fails on bendin
7、g.Theflexibility of the adhesive is the smallest diameter mandrel overwhich four out of five test specimens do not break.5.Significance and Use5.1 The“Mandrel Bend”test is simple and fast.It requireslittle investment in equipment and little operator training.Theprime purpose is to determine whether
8、a hot-melt adhesivemeets flexibility requirements.This test is also useful forcomparing flexibility of several adhesives.It can be used todesign adhesives by comparing the flexibility of variousformulations to meet specific end use parameters.The adhesiveflexibility can be determined at temperatures
9、 other than ambi-ent by conditioning the test apparatus and test specimens at thedesired temperature and performing the test under thesetemperature conditions.6.Apparatus6.1 The test apparatus consists of a series of differentdiameter cylindrical rods or mandrels supported at each end.There shall be
10、 enough space to permit placement of the flat sideof a test specimen tangentially at right angles to the longitu-dinal axis of the test mandrel.Individual requirements deter-mine the diameter and lengths of the rods needed.For mosttests,3.2 mm(;18in.),6.4 mm(;14in.),and 12.8 mm(;12in.)diameter by 75
11、 to 150-mm(;3 to 6-in.)long rods made ofbrass or stainless steel are satisfactory.Fig.1 describes twosimple test frames,one with fixed mandrels and the otherdesigned to take any diameter mandrel.7.Test Specimen7.1 The test specimen dimensions can be varied dependingon the end use requirements of the
12、 hot-melt adhesive.Fig.2describes a recommended specimen size.It is 10 mm(;0.4in.)wide,75 mm(;3 in.)long and 1.25 6 0.01 mm(;0.05in.)thick.The thickness dimension is critical and must beaccurately measured.The test specimens shall be cut frommolded or extruded sheets or film.Plying of several thinne
13、rsamples shall not be permitted.No flaws visible anywhere inthe sample to the naked eye shall be permitted.1This test method is under the jurisdiction of ASTM Committee D10 onPackaging and is the direct responsibility of Subcommittee D10.14 on Tape andLabels.Current edition approved Oct.1,2010.Publi
14、shed October 2010.Originallyapproved in 1972.Last previous edition approved in 2004 as D3111 99(2004)1.DOI:10.1520/D3111-10.2For 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
15、to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 8.Conditioning8.1 Store the test specimens and test apparatus at the testconditions for 24 h.Perform the test under these samecondit
16、ions.Forrapidscreening,particularlyatlowtemperatures,a minimum of 4 h conditioning can be used.Notethis change when recording data.If other conditions are notspecified,the storage and test conditions will be 23 6 2C andNOTE1(Recess to fit test frame)Figures in parentheses are approximate.FIG.1 Test Mandrel(Various Diameters)for Test FrameFIG.2 Test SpecimenD3111 102 50 6 5%relative humidity.Specification E171,details theseand other tests conditions.9.Failure9.1 Failure is a visible fracture,craz
