1、Designation:D335415Standard Test Method forBlocking Load of Plastic Film by the Parallel Plate Method1This standard is issued under the fixed designation D3354;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision
2、.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method yields quantitative information regard-ing the degree of blocking(unwanted adhesion)existingbetween layers of plastic
3、film.It is not intended to measuresusceptibility to blocking.1.2 By this procedure,the film-to-film adhesion,expressedas a blocking load in grams,will cause two layers of film withan area of contact of 100 cm2to separate.The test method islimited to a maximum load of 200 g.1.3 The values stated in S
4、I units are to be regarded asstandard.The values given in parentheses are for informationonly.1.4 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 practi
5、ces and determine the applica-bility of regulatory limitations prior to use.NOTE1This test method is similar to ISO 11502 Method B,but is nottechnically equivalent.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD883 Terminology Relating to PlasticsE691 P
6、ractice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 ISO Standard:ISO 11502 Determination of Blocking Resistance33.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D883.4.Summary of Test Method4.1 Two pieces of f
7、ilm,which are in contact with each other,are placed between two 100-mm(4-in.)square blocks.Theends of the films that extend past the blocks are secured to therespective upper and lower block.The force required toovercome the adhesion(blocking force)between the twopieces of film or until they reach 1
8、.9 cm of separation ismeasured in grams using a constant-rate-of-load or a constant-rate-of separation device.5.Significance and Use5.1 Blocking develops in film processing and storage whenlayers of smooth film are in intimate contact with nearlycomplete exclusion of air.Temperature,or pressure,or b
9、oth,can induce or change the degree of adhesion of the surfaces.5.2 The procedure of this test method closely simulates theoperation of separating film in some end-use applications.6.Apparatus6.1 The parallel block faces shall be square and 100 6 0.1mm(on each edge with a flat and slightly knurled o
10、r sand-blasted finish of root mean square 125).A means must beprovided to prevent the blocks from sliding when they are incontact during loading.6.2 Constant-Rate-of-Load Device4:6.2.1 An instrument with 100-cm2(4-in.2)blocks whichelectronically times a loading rate of 90 grams per minute(61)(see Fi
11、g.1).The force required to separate the blocks isdisplayed electronically.NOTE2On some constant-rate-of load devices,the weight is added bymoving a weight axially along the beam with a precision-drive system.This may be accomplished using a stepper motor with a digital steppingdrive with 60 cycles a
12、s its reference control.The load rate must be 90grams per minute.6.3 Constant-Rate-of-Separation Testing DeviceA testingmachine of the constant-rate-of crosshead-movement type andcomprising essentially the following:1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is
13、the direct responsibility of Subcommittee D20.19 on Film,Sheeting,andMolded Products.Current edition approved April 1,2015.Published April 2015.Originallyapproved in 1974.Last previous edition approved in 2011 as D3354-11.DOI:10.1520/D3354-15.2For referenced ASTM standards,visit the ASTM website,www
14、.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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.4T
15、he sole source of supply of the electro mechanical apparatus known to thecommittee at this time has discontinued production and the apparatus is no longeravailable.If you are aware of alternative suppliers,please provide this informationto ASTM International Headquarters.Your comments will receive c
16、areful consid-eration at a meeting of the responsible technical committee,1which you may attend.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.3.1 Fixed MemberA fixed or essentially stationarymember carrying one aluminum block 100 by 100 6 1 mmwith appropriate rigid adapter for mounting in a universaltesting machine.6.3.2 Movable MemberA movable member carrying asecon
