1、March 2008DEUTSCHE NORM English price group 6No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 83.140.10!$MP“1424592www.
2、din.deDDIN ISO 8296Plastics Film and sheeting Determination of wetting tension (ISO 8296:2003)English version of DIN ISO 8296:2008-03Kunststoffe Folien und Bahnen Bestimmung der Benetzungsspannung (ISO 8296:2003)Englische Fassung DIN ISO 8296:2008-03SupersedesDIN ISO 8296:2006-09www.beuth.deDocument
3、 comprises 8 pagesDIN ISO 8296:2008-03 2 National foreword This standard has been prepared by Technical Committee ISO/TC 61 “Plastics”. The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Technical Committee 054-04-04 AA Kunstst
4、off-Folien und kunststoffbeschichtete Flchengebilde (Kunstleder) Allgemeine Eigenschaften. Particular note should be taken of the warnings and safety recommendations given in the Verordnung ber gefhrliche Arbeitsstoffe (Arbeitsstoffverordnung ArbStoffV) (German Ordinance on hazardous industrial subs
5、tances) of 11 February 1982. (Translators note: This ordinance has since been repealed and replaced by the Gefahrstoffverordnung.) The following information is given as an aid to applying this standard. Remarks on subclause 1.2: This method is primarily used in practice as a fast test method. Values
6、 obtained with this method can vary considerably from those obtained with other test methods (e.g. surface tension measurements). When comparing measured results for different polymers or formulations it should be noted that substances on the film surface (e.g. lubricants) may react differently with
7、 the test mixture. Because such substances can partially dissolve, depending on the formulation, the results may not be comparable or comparability may be limited. Note to clause 4: When using cotton-tipped wood sticks or brushes, care should be taken that binders or other surface-active agents are
8、not introduced into the test mixture. Additional information to subclause 4.1: Uses for hand coaters with wire bar: Applying uniform layers of paints, adhesives and similar products on flexible substrates for testing purposes and flow testing. Hand coater design: with wire bar; solvent is fully bond
9、ed; achievable wet film thickness embossed on bar end. Advantages: ideal for flexible materials such as paper, board, test cards, film, leather, textiles, etc.; practical (commercially available hand coaters all work according to the same principles); simultaneous application on several specimens po
10、ssible; non-bleeding products remain in place. DIN ISO 8296:2008-03 3 Use: lay substrate to be coated on flat surface; put hand coater in place; pour product to be tested on substrate; hold both sides of bar (or grips) and with uniform speed (ca. 25 mm/s) pull do not roll! across substrate; clean ha
11、nd coater immediately with solvent. Note to clause 6: Avoid any high electric charges on the surface. Explanatory notes to clause 8: The surface quality i.e. whether it has a bright or matt finish or is embossed has a strong influence on the wetting tension and should therefore be given in the test
12、report. If the film surface is adversely affected by the ethylene glycol monoethyl ether-formamide mixture, a methanol-water mixture is to be used for the wetting tension range of 30 mN/m to 58 mN/m. The DIN Standard corresponding to the International Standard referred to in clause 2 of this documen
13、t is as follows: ISO 291 DIN EN ISO 291 Amendments This standard differs from DIN 53364:1975-06 as follows: a) The content of International Standard ISO 8296:2003 has been adopted in full. b) The standard now applies to plastics film and sheeting in general (i.e. it is not restricted to PE and PP fi
14、lm). c) The test is to be conducted in standard laboratory atmosphere 23/50 as in ISO 291. d) Specimen dimensions are changed to 10 cm 10 cm. e) More test mixtures for determining wetting tension are listed (see Table 1). f) The clause “Evaluation” has been deleted. g) The standard has been adapted
15、to the currently valid rules of presentation. The following changes have been made to DIN ISO 8296:2006-09: a) In Table 1 (column 1, line 6) the wetting tension value has been corrected to 32,0 mN/m. Previous editions DIN 53364: 1975-06 DIN ISO 8296: 2006-09 DIN ISO 8296:2008-03 4 National Annex NA
16、(informative) Bibliography DIN EN ISO 291, Plastics Standard atmospheres for conditioning and testing ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies(ISO member bodies). The work of preparing International Standards is normally
17、carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work.
18、 ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare Internatio
19、nal Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elemen
20、ts of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 8296 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products.This second edition cancels and replaces the first edition (ISO 8296:
21、1987), of which it constitutes a minorrevision which included the correction of 4.1 to simply specify a “wire bar” (rather than “wire bar No. 2” as in thefirst edition) and correction of the area over which the liquid is spread in 7.2, second paragraph, from to.20 cm26cm25 DIN ISO 8296:2008-03 Plast
22、ics Film and sheeting Determination of wetting tension 1Scope1.1 This International Standard specifies a method for determining the wetting tension of surfaces of plasticfilm and sheeting in contact with drops of specific test solutions.1.2 The ability of plastic films to retain inks, coatings, adhe
23、sives, etc., is primarily dependent on the characterof their surfaces, and can be improved by one of several surface-treatment techniques. These same treatmenttechniques have been found to increase the wetting tension of a plastic film surface in contact with mixtures ofsolvents. It is therefore pos
24、sible to relate the wetting tension of a plastic film surface to its ability to accept andretain inks, coatings, adhesives, etc. The measured wetting tension of a specific film surface can only be relatedto acceptable ink, coating, or adhesive retention through experience. Wetting tension, in itself
25、, is not acompletely acceptable measure of ink, coating or adhesive adhesion.1.3 Any contamination of the film surface and any trace of surface-active impurities in the liquid reagents mayaffect the wetting tension. It is therefore important that the portion of the film surface to be tested is not t
26、ouchedor rubbed, that all equipment be scrupulously clean, and that reagent purity be carefully controlled. Glassapparatus, in particular, is likely to be contaminated with detergents having very strong surface tension reducingability, unless specific precautions are taken to ensure their absence su
27、ch as by cleaning with an oxidizingagent, for example chromic-sulfuric acid or sulfuric acid-ammonium peroxydisulfate, and rinsing with distilledwater.1.4 The test is not applicable when the surface of the material to be tested reacts chemically with the testsolution.1.5 It should be noted that surf
28、ace properties of plastic film and sheeting may change by ageing processes.The measurements must therefore be related to the age of the film.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited ap
29、plies. For undated references, the latest edition of the referenced document(including any amendments) applies.ISO 291, Plastics Standard atmospheres for conditioning and testing3 PrinciplesA series of mixtures of solvents of gradually increasing surface tension are applied to the surface of the pla
30、sticfilm until a mixture is obtained that just wets the film surface. The wetting tension of the surface under test isapproximated by the surface tension of this particular mixture.4 ApparatusOrdinary laboratory apparatus and the following:4.1 Hand-coater, with a wire bar depositing a film. Alternat
31、ively, cotton-tipped wood sticks or brushesmay be used, provided that they give the same test result.12 m6 DIN ISO 8296:2008-03 4.2 Brown-glass dropper bottles.5 Test mixturesTest mixtures of graduated wetting tension shall be prepared by mixing reagent grades of ethylene glycolmonoethyl ether (Cell
32、osolve), formamide, methanol and water in accordance with Table 1. The test mixturesshall be stored in the brown-glass dropper bottles (4.2). If well protected, the mixtures change very little withtime. If used frequently, they shall be renewed after 3 months.SAFETY PRECAUTIONS When handling the sol
33、vents, the appropriate laboratory safety precautionsmust be taken.6 SamplingWhether a film is presented in the form of rolls or in the form of piled sheets, two surfaces are in contact (as arule, front with reverse). When sampling, care shall be taken that the surfaces to be tested do not come intoc
34、ontact with any other material. In the case of a roll, this is achieved by discarding the outer layer and unwindinga sample without touching the areas to be tested. In the case of a pile, some sheets are taken together and theoutermost sheets discarded before testing.The actual specimens for testing
35、 shall be taken from these samples immediately before the tests are carriedout. Normally, a specimen measuring is sufficient.7 Procedure7.1 Conduct the test in standard laboratory atmosphere 23/50 (see ISO 291).7.2 Place the test specimen on the ground plate of the hand-coater (4.1). Apply a few dro
36、ps of the test mixture(Clause 5) to the film in front of the wire bar and spread immediately by drawing the bar.If a brush or cotton-tipped stick is used for spreading the test mixtures, the liquid shall be spread rapidly over anarea of at least . The quantity of liquid shall be such that it forms a
37、 thin film without pools.Observe the liquid film of the test mixture under glancing illumination and note the time taken for the continuousliquid film to break up into droplets. If the liquid film holds together for more than , repeat the test on a newspecimen with a mixture of the next higher surfa
38、ce tension, until the liquid film breaks up in less than . If theliquid film holds for less than , proceed to lower surface tensions until the film persists for .7.3 For each test, use a new cotton applicator. Clean the brush or wire bar after each use by rinsing inmethanol and drying, because the l
39、iquid remaining on these spreaders will change in composition and surfacetension by evaporation.7.4 Note the mixture that comes nearest to wetting the surface for , based on at least three determinationswith that mixture. The surface tension of this mixture shall be reported as the wetting tension o
40、f the plastic film.8 Test reportThe test report shall include the following particulars:a) a reference to this International Standard;b) all details necessary for identification of the plastic film and, if known, its approximate age;c) the side and location tested;d) the wetting tension of the film.
41、10 cm 10 cm6cm22s2s2s 2s2s7 DIN ISO 8296:2008-03 Table 1 Test mixtures for the determination of the wetting tension of plastic film and sheetingWetting tensionEthylene glycol monoethyl etherFormamide Methanol Water22,6 100,0 025,4 90,0 10,027,3 80,0 20,030,0 100,031,0 97,5 2,532,0 89,5 10,533,0 81,0
42、 19,034,0 73,5 26,535,0 65,0 35,036,0 57,5 42,537,0 51,5 48,538,0 46,0 54,039,0 41,0 59,040,0 36,5 63,541,0 32,5 67,542,0 28,5 71,543,0 25,3 74,744,0 22,0 78,045,0 19,7 80,346,0 17,0 83,048,0 13,0 87,050,0 9,3 90,752,0 6,3 93,754,0 3,5 96,556,0 1,0 99,058,0 100,059,0 95,0 5,060,0 80,0 20,061,0 70,0 30,062,0 64,0 36,063,0 50,0 50,064,0 46,0 54,065,0 30,0 70,067,0 20,0 80,070,0 10,0 90,073,0 100,0mN/m ml ml ml ml8 DIN ISO 8296:2008-03
