1、BRITISH STANDARD BS ISO 8296:2003 Plastics Film and sheeting Determination of wetting tension ICS 83.140.10 BS ISO 8296:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 September 2003 BSI 16 September 2003 ISBN 0 580 42634 3 National f
2、oreword This British Standard reproduces verbatim ISO 8296:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/75, Plastics and rubber film and sheets, which has the responsibility to: A list of organizations represente
3、d on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the
4、 “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from le
5、gal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.
6、Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii and iii, a blank page, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.
7、No. Date CommentsINTERNATIONAL STANDARD ISO 8296 Second edition 2003-09-01 Reference number ISO 8296:2003(E) OSI 2003 Plastics Film and sheeting Determination of wetting tension Plastiques Film et feuille Dtermination de la tension de mouillageBSISO8296:2003ISO :6928(3002)E ii ISO 3002 All rithgs re
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12、itnuoc ehry fo teh euqertsre. SIc Oopyright ofifce saCe soptael 65 -HCG 1121eneva 02 Te.l 22 14 + 10 947 11 Fax + 22 14 0 9479 74 Eam-il ocpyrithgios.ogr Web wwwi.soo.rg Pubni dehsil Stiwrezldna BSISO8296:2003OSI 9283002:6)E( ISO 3002 r llAithgs reservde iii Foreword ISO (the International Organizat
13、ion for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established h
14、as the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Int
15、ernational 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 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Public
16、ation as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent ri
17、ghts. 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 8296:1987), of which it constitutes a minor revision which included the correction of 4.1 to simply specify a “wire bar” (rather than
18、“wire bar No. 2” as in the first edition) and correction of the area over which the liquid is spread in 7.2, second paragraph, from to . 20 cm 2 6cm 2 BSISO8296:2003blank BSISO8296:2003ANRETNIITOTS LANDNADRA OSI 9283002:6)E( ISO 3002 r llAithgs reservde 1 Plastics Film and sheeting Determination of
19、wetting tension 1S c o p e 1.1 This International Standard specifies a method for determining the wetting tension of surfaces of plastic film and sheeting in contact with drops of specific test solutions. 1.2 The ability of plastic films to retain inks, coatings, adhesives, etc., is primarily depend
20、ent on the character of their surfaces, and can be improved by one of several surface-treatment techniques. These same treatment techniques have been found to increase the wetting tension of a plastic film surface in contact with mixtures of solvents. It is therefore possible to relate the wetting t
21、ension of a plastic film surface to its ability to accept and retain inks, coatings, adhesives, etc. The measured wetting tension of a specific film surface can only be related to acceptable ink, coating, or adhesive retention through experience. Wetting tension, in itself, is not a completely accep
22、table 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 may affect the wetting tension. It is therefore important that the portion of the film surface to be tested is not touched or rubbed, that a
23、ll equipment be scrupulously clean, and that reagent purity be carefully controlled. Glass apparatus, in particular, is likely to be contaminated with detergents having very strong surface tension reducing ability, unless specific precautions are taken to ensure their absence such as by cleaning wit
24、h an oxidizing agent, for example chromic-sulfuric acid or sulfuric acid-ammonium peroxydisulfate, and rinsing with distilled water. 1.4 The test is not applicable when the surface of the material to be tested reacts chemically with the test solution. 1.5 It should be noted that surface properties o
25、f plastic film and sheeting may change by ageing processes. The measurements must therefore be related to the age of the film. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For u
26、ndated references, the latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditioning and testing 3 Principles A series of mixtures of solvents of gradually increasing surface tension are applied to the surface of the plastic fil
27、m until a mixture is obtained that just wets the film surface. The wetting tension of the surface under test is approximated by the surface tension of this particular mixture. 4 Apparatus Ordinary laboratory apparatus and the following: 4.1 Hand-coater, with a wire bar depositing a film. Alternative
28、ly, cotton-tipped wood sticks or brushes may be used, provided that they give the same test result. 12 m BSISO8296:2003ISO :6928(3002)E 2 ISO 3002 All rithgs reresvde 4.2 Brown-glass dropper bottles. 5 Test mixtures Test mixtures of graduated wetting tension shall be prepared by mixing reagent grade
29、s of ethylene glycol monoethyl ether (Cellosolve), formamide, methanol and water in accordance with Table 1. The test mixtures shall be stored in the brown-glass dropper bottles (4.2). If well protected, the mixtures change very little with time. If used frequently, they shall be renewed after 3 mon
30、ths. SAFETY PRECAUTIONS When handling the solvents, the appropriate laboratory safety precautions must be taken. 6 Sampling Whether a film is presented in the form of rolls or in the form of piled sheets, two surfaces are in contact (as a rule, front with reverse). When sampling, care shall be taken
31、 that the surfaces to be tested do not come into contact with any other material. In the case of a roll, this is achieved by discarding the outer layer and unwinding a sample without touching the areas to be tested. In the case of a pile, some sheets are taken together and the outermost sheets disca
32、rded before testing. The actual specimens for testing shall be taken from these samples immediately before the tests are carried out. Normally, a specimen measuring is sufficient. 7 Procedure 7.1 Conduct the test in standard laboratory atmosphere 23/50 (see ISO 291). 7.2 Place the test specimen on t
33、he ground plate of the hand-coater (4.1). Apply a few drops 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 an area of at
34、least . The quantity of liquid shall be such that it forms a thin film without pools. Observe the liquid film of the test mixture under glancing illumination and note the time taken for the continuous liquid film to break up into droplets. If the liquid film holds together for more than , repeat the
35、 test on a new specimen with a mixture of the next higher surface tension, until the liquid film breaks up in less than . If the liquid 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 b
36、ar after each use by rinsing in methanol and drying, because the liquid remaining on these spreaders will change in composition and surface tension by evaporation. 7.4 Note the mixture that comes nearest to wetting the surface for , based on at least three determinations with that mixture. The surfa
37、ce tension of this mixture shall be reported as the wetting tension of the plastic film. 8 Test report The 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 approximat
38、e age; c) the side and location tested; d) the wetting tension of the film. 10 cm 10 cm 6cm 2 2s 2s 2s 2s 2s BSISO8296:2003OSI 9283002:6)E( ISO 3002 r llAithgs reservde 3 Table 1 Test mixtures for the determination of the wetting tension of plastic film and sheeting Wetting tension Ethylene glycol m
39、onoethyl ether Formamide Methanol Water 22,6 100,0 0 25,4 90,0 10,0 27,3 80,0 20,0 30,0 100,0 31,0 97,5 2,5 32,0 89,5 10,5 33,0 81,0 19,0 34,0 73,5 26,5 35,0 65,0 35,0 36,0 57,5 42,5 37,0 51,5 48,5 38,0 46,0 54,0 39,0 41,0 59,0 40,0 36,5 63,5 41,0 32,5 67,5 42,0 28,5 71,5 43,0 25,3 74,7 44,0 22,0 78
40、,0 45,0 19,7 80,3 46,0 17,0 83,0 48,0 13,0 87,0 50,0 9,3 90,7 52,0 6,3 93,7 54,0 3,5 96,5 56,0 1,0 99,0 58,0 100,0 59,0 95,0 5,0 60,0 80,0 20,0 61,0 70,0 30,0 62,0 64,0 36,0 63,0 50,0 50,0 64,0 46,0 54,0 65,0 30,0 70,0 67,0 20,0 80,0 70,0 10,0 90,0 73,0 100,0 mN/m ml ml ml ml BSISO8296:2003BS ISO 82
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