1、BRITISH STANDARDBS EN ISO11502: 2005IncorporatingAmendment No. 1(to renumber BS 2782-8:Method 825A:1996as BS EN ISO11502:2005)Methods of testingPlastics Part 8: Other properties Method 825A: Film and sheeting Determination of blocking resistanceIMPORTANT NOTE. Before reading this method it is essent
2、ial to readBS 2782-0 Introduction issued separatelyThis European Standard EN ISO 11502:2005 has the status of a British StandardICS 83.140BS EN ISO 11502:2005This British Standard, havingbeen prepared under thedirection of the Sector Board for Materials and Chemicals, was published under theauthorit
3、y of the Standards Board and comes into effect on15 May 1996 BSI 2006ISBN 0 580 25575 1Committees responsible for this British StandardThe preparation of this British Standard was entrusted to TechnicalCommittee PRI/75, Plastics and rubber films and sheets, upon which the following bodies were repre
4、sented:British Plastics FederationHer Majestys Stationery OfficeInstitute of Trading Standards AdministrationMinistry of DefencePackaging and Industrial Films AssociationPIRA InternationalAmendments issued since publicationAmd. No. Date Comments15943 July 2006 Renumbers BS 2782-8: Method 825A:1996 a
5、s BS EN ISO 11502:2005BS EN ISO 11502:2005 BSI 11-1999 iContentsPageCommittees responsible Inside front coverNational foreword ii1 Scope 12 Normative reference 13 Definition 14 Method A: Qualitative method 15 Method B: Quantitative method 2Figure 1 Assembly of specimens for qualitative method (metho
6、d A) 3Figure 2 Separation of specimens in qualitative method (method A) 4Figure 3 Assembly of specimens for quantitative method (method B) 4Figure 4 Fixing blocked specimens to aluminium blocks in quantitative method (method B) 5Figure 5 Specimen in test position in quantitative method (method B) 5L
7、ist of references Inside back coverBS EN ISO 11502:2005ii BSI 11-1999National forewordThis British Standard is the official English language version ofEN ISO 11502:2005. It is identical with ISO 11502:1995, Plastics Film and sheeting Determination of blocking resistance, published by the Internation
8、alOrganization for Standardization (ISO).The UK participation in its preparation was entrusted by Technical CommitteePRI/75, Plastics, film and sheeting, which has the responsibility to:A list of organizations represented on this committee can be obtained on requestto its secretary.Cross-referencesT
9、he Technical Committee has reviewed the provsions of ISO 291:1997, to whichnormative reference is made in the text and which is related to BS 2782-0Introduction, and has decided that they are acceptable for use in conjunction withthis standard.This publication does not purport to include all the nec
10、essary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunityfrom legal obligations. aid enquirers to understand the text; present to the responsible international/European committee anyenquiries on the interpr
11、etation, or proposals for change, and keep theUK interests informed; monitor related international and European developments andpromulgate them in the UK.Summary of pagesThis document comprises afront cover, an insidefront cover, the EN ISO title page,pages 1 to 6, an inside back cover and a back co
12、ver.This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 11502July 2005ICS 83.140.10English VersionPlastics - Film and sheeting - Deter
13、mination of blockingresistance (ISO 11502:1995)Plastiques - Film et feuille - Dtermination du pouvoirbloquant (ISO 11502:1995)Kunststoffe - Folien und Bahnen - Bestimmung desBlockwiderstandes (ISO 11502:1995)This European Standard was approved by CEN on 7 July 2005.CEN members are bound to comply wi
14、th the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretaria
15、t or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialvers
16、ions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerl
17、and and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO
18、11502:2005: EEN ISO 11502:2005 (E) Foreword The text of ISO 11502:1995 has been prepared by Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 11502:2005 by Technical Committee CEN/TC 249 “Plastics“, the secretariat
19、of which is held by IBN.This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2006, and conflicting national standards shall be withdrawn at the latest by January 2006. According to the CEN/CENE
20、LEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malt
21、a, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 11502:1995 has been approved by CEN as EN ISO 11502:2005 without any modifications. EN ISO 11502:2005 BSI 11-1999 11 ScopeThis International Standard specif
22、ies two methods for assessing the tendency of flexible plastic films and sheets to adhere to one another when left in contact for some time, at a specified temperature and under light pressure. One method is qualitative and the other is quantitative.2 Normative referenceThe following standard contai
23、ns provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate
24、the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 291:1977, Plastics Standard atmospheres for conditioning and testing. 3 DefinitionFor the purposes of this International Stand
25、ard, the following definition applies.3.1 blockingunintentional adherence between materials4 Method A: Qualitative method4.1 PrinciplePieces of film or sheeting are kept in contact with one another for a minimum of 24 h at 50 C under a pressure of 7 kPa. Blocking is considered to have occurred if th
26、e surfaces suffer damage when they are separated or if the force of adherence between them is sufficient to lift a given weight.Alternative times, temperatures and pressures may be used depending on the nature of the plastic film or sheeting under test and the proposed end use of the material.4.2 Ap
27、paratus4.2.1 Glass plates, measuring 100 mm 76 mm and approximately 2 mm thick.4.2.2 Strips of filter paper,measuring 150 mm 76 mm.4.2.3 Oven, capable of being maintained at 50 C 2 2 C, with provision for placing the test assemblies on shelves so that they are no less than 50 mm from each other and
28、from the sides of the oven.4.2.4 Weights, of mass 5,4 kg.4.2.5 Metal bars, of rectangular cross-section, 15 mm wide 76 mm long, weighing 50 g and 100 g.4.2.6 Metal clip, with arms approximately 100 mm long.4.2.7 Double-sided adhesive tape,approximately 12,5 mm wide.4.3 Test specimens4.3.1 Shape and
29、dimensionsThe specimens shall consist of strips measuring 150 mm 76 mm. In the case of film or sheeting with a printed or embossed surface, this side shall be known as the face. The opposite side is called the back. If there is no print or embossing, one side shall be called the face and marked acco
30、rdingly.4.3.2 PreparationSix specimens shall be taken, provided that for printed or coloured film or sheet these include all the colours or colour combinations of the print and base sheeting. If this requirement is not satisfied, additional specimens shall be taken. In the case of rolls, all specime
31、ns shall be taken at least 100 mm from the edge and more than 1 m from the beginning or the end of the roll. The minimum time between manufacture and testing shall be 16 h.4.4 Procedure4.4.1 Condition the specimens, together with the glass plates (4.2.1) and strips of filter paper (4.2.2)in one of t
32、he standard atmospheres defined in ISO 291 for a period of 24 h.4.4.2 Stack two specimens, strips of filter paper and glass plates on top of each other in the following order: glass plate, strip of filter paper, specimen with face uppermost, specimen with face downwards, strip of filter paper, glass
33、 plate.Align the components of the assembly along one of their 76 mm edges so that the specimens and strips of filter paper extend 50 mm beyond the glass plates at the opposite edge, in order to facilitate handling (see Figure 1).Prepare two more assemblies in the same way, except that in the second
34、 the specimens shall be back to back and in the third back to face.4.4.3 Place each assembly in the oven (4.2.3) and load each with a weight of mass 5,4 kg (4.2.4) to give a uniform pressure of 7 kPa over the area under test. Maintain the oven temperature at 50 C 2 C for 24 h, after which time the w
35、eights shall be removed, and the assemblies taken from the oven and kept at standard atmospheric conditions for not less than 2 h but not more than 24 h.EN ISO 11502:20052 BSI 11-19994.4.4 Carefully remove each pair of specimens from its assembly and lay them flat on a plane horizontal surface.Attac
36、h a metal bar (4.2.5) of mass 50 g or 100 g, depending on the surface of the specimens under test, to the free end of the lower specimen of each pair by double-faced adhesive tape (4.2.7) and allow it to rest freely on the horizontal surface (see Figure 2).For unprinted surfaces, use a 50 g metal ba
37、r.For printed surfaces, use a 100 g metal bar.Test sunken or sandwich print sheeting as unprinted surfaces.Insert the free end of the upper specimen into a metal clip (4.2.6) so that the whole width of the specimen is held in the clip and raise the clip manually at a uniform rate of 25 mm/s 2,5 mm/s
38、 until the specimens have completely separated. Note whether or not the metal bar is lifted off the horizontal surface.Examine the surfaces of the specimens that were in contact with one another for visible signs of damage.4.4.5 Blocking shall be considered to have occurred if, during separation of
39、the specimens, the metal bar is lifted off the horizontal surface or if the separated specimens show surface damage.4.5 Test reportThe test report shall include the following information:a) a reference to this International Standard and to the method used (method A);b) all details necessary for iden
40、tification of the material tested;c) the metal bar used;d) whether or not blocking occurred, the damage observed, if any, and the surfaces involved in each case;e) the date of the test.5 Method B: Quantitative method5.1 PrincipleSpecimens of film or sheeting are kept in contact with each other under
41、 specified conditions of time, temperature and pressure. The specimens are then fixed between two platens mounted in a universal testing machine, and the force necessary to separate them is determined.5.2 Apparatus5.2.1 Constant-speed tensile-testing machine,having a pair of 100 mm 100 mm aluminium
42、blocks mounted on the top and bottom jaws by means of suitable adapters.5.2.2 Glass plates, measuring 100 mm 76 mm and approximately 2 mm thick.5.2.3 Strips of filter paper,measuring 100 mm 76 mm.5.2.4 Weights, of mass 2,3 kg.5.2.5 Oven, capable of being maintained at 50 C 2 C.5.2.6 Double-sided adh
43、esive tape5.3 Test specimens5.3.1 Shape and dimensionsSpecimens shall consist of strips measuring 150 mm 76 mm, cut so that the longest side coincides with the machine direction of the film or sheeting.5.3.2 PreparationTen specimens shall be taken from several locations across the width of the mater
44、ial. In the case of rolls, all specimens shall be taken at least 100 mm from the edge and more than 1 m from the beginning or the end of the roll. The minimum time between manufacturing and testing shall be 16 h.5.4 Procedure5.4.1 Condition the specimens, together with the glass plates (5.2.2) and s
45、trips of filter paper (5.2.3),in one of the standard atmospheres defined in ISO 291 for a period of 24 h.5.4.2 Prepare five assemblies, each containing two specimens held between strips of filter paper and glass plates in the same way as described in method A, but aligning the edges of the layers as
46、 shown in Figure 3. The orientation of the specimen surfaces with respect to each other in the assemblies is left to the discretion of the user (it may, for instance, depend in the results of testing using the qualitative method), but it shall be the same in each of the five assemblies. Place a weig
47、ht of mass 2,3 kg (equivalent to 3 kPa) on each assembly and heat them in the oven (5.2.5) for 3 h at 50 C 2 C. After this time, remove the weights and take the assemblies from the oven. Carefully remove each pair of specimens from its assembly and keep at standard atmospheric conditions for not les
48、s than 2 h but not more than 24 h.5.4.3 Using a wide-bladed knife or spatula, transfer one of the pairs of specimens carefully to the lower block in the tensile-testing machine, placing it so that its ends project out equally on each side of the block (see Figure 4).5.4.4 Raise the lower block until
49、 the upper block is resting on the specimen directly above the lower block.EN ISO 11502:2005 BSI 11-1999 35.4.5 Carefully separate the ends of the pair of specimens using the sharp edge of the knife blade and peel back to the edges of the blocks on each side.5.4.6 Using the double-sided adhesive tape (5.2.6),fix the two ends of the upper specimen to the upper block and the two ends of the lower specimen to the lower block (see Figure 5).5.4.7 Adjust the chart speed to 50 mm/min and the crosshead speed to 5 mm/min.5.4.8 Sta
