1、BRITISH STANDARD BS 2782-8: Method 826A: 1992 Methods of testing Plastics Part 8: Other properties Method 826A: Determination of adhesion of print on plastics sheet IMPORTANT NOTE. Before reading this method it is essential to read BS 2782-0, Introduction, issued separately.BS2782-8:Method 826A:1992
2、 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15 November1992 BSI 07-1999 The following BSI references relate to the work on this standard: Committ
3、ee reference PRM/21 Draft for comment 92/37997 DC ISBN 0 580 21229 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies we
4、re represented: British Plastics Federation British Textile Confederation Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laboratory) EEA (The Association of Electronics, Telecommunications and Business Equipment Industries) Electri
5、cal and Electronic Insulation Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.) Ministry of Defence PIRA International Packaging and Industrial Films Association Plastic Industrial Containers Association Plastics and Rubber Institute RAPRA Technology Ltd. Yarsley Technical Centre Ltd. Amendments issued
6、since publication Amd. No. Date CommentsBS2782-8:Method 826A:1992 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Principle 1 4 Apparatus 1 5 Abrading fabric 1 6 Test pieces 1 7 Conditioning 1 8 Procedure 1 9 Expression of results 3 10 Tes
7、t report 3 Figure 1 Apparatus for measuring print adhesion 2 Figure 2 Detail of abrading member 2 List of references Inside back coverBS2782-8:Method 826A:1992 ii BSI 07-1999 Foreword This method has been prepared under the direction of the Plastics and Rubber Standards Policy Committee. It supersed
8、es method 310B of BS2782:1970 which has been withdrawn. WARNING NOTE. This method does not necessarily detail all precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974 1. Attention should be paid to any appropriate safety precautions and the method should be op
9、erated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary
10、 of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front
11、cover.BS2782-8:Method 826A:1992 BSI 07-1999 1 1 Scope This Part of BS2782 describes a method for the determination of the adhesion of print on plastics sheet. 2 References 2.1 Normative references This Part of BS2782 incorporates, by reference, provisions from specific editions of other publications
12、. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this method only when incorporated in it by updating or revision. 2.2 Informative refer
13、ences This Part of BS2782 refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Principle The washed and dried test pi
14、ece is mounted on a glass plate and abraded with a piece of fabric. The number of cycles required to cause physical damage to the print on the test piece is recorded. 4 Apparatus The apparatus consists of an abrading member A, a means of moving a test piece to and fro in a straight line while it is
15、in contact with the abrading member, and a glass plate B of suitable dimensions, on which the test piece rests. The test piece is attached to the glass plate with clips or double sided tape. The essential details are shown in Figure 1. The length of the stroke moving the test piece is100mm. The appa
16、ratus operates smoothly at15 2 cycles per minute, one cycle being one complete to and fro movement. The abrading member A is a brass peg covered with an abrading fabric (see clause5), as detailed in Figure 2, and is firmly secured to the arm of the apparatus with its centre line in right angles to t
17、he surface of the glass plate B. The arm of the apparatus is loaded in such a manner that the brass peg exerts a force of 9N 1N on the test piece. To avoid uneven wear of the test specimen and abradant, it is important that the base of the brass peg and the surface of the glass plate are parallel an
18、d that the periphery of the base edge of the brass peg contains no burrs. NOTEParallelism of the surfaces can be ensured, after any necessary adjustments, by operating the apparatus with a suitable grade of emery cloth mounted in the test specimen position until the base of the brass peg is uniforml
19、y abraded. 5 Abrading fabric The abrading fabric 1)shall be a 100% combed cotton fabric with a plain weave, desized, scoured and bleached and free from fluorescent brightening agents, having a fluidity not greater than5, a mass per unit area of 94g/m 2 4g/m 2and a fabric construction of 40ends per c
20、entimetre and 40picks per centimetre. 6 Test pieces Cut test pieces from the sheet under test, each test piece having dimensions 230mm long and 50mm wide. Cut each test piece such that a portion of the printed design lies in the path of the abrading member. Use three test pieces for material on whic
21、h the printed matter is uniform in colour. For material with printed matter of more than one colour, prepare sufficient test pieces so that there are three test pieces for each colour or combination of print. NOTEIt is usually possible to test more than one colour of print in a single test piece by
22、suitable choice of position of test piece on the material under test. 7 Conditioning Wash each test piece with soap and clean water at ambient temperature, then thoroughly rinse and dry, also at ambient temperature. Condition each test piece at 23 C 2 C and (50 5)% r.h. for at least 4h before testin
23、g. 8 Procedure Mount the test piece on the glass plate using either clips or double sided tape to clamp it firmly to the glass, so that there is no buckling or wrinkling of the test piece during the test. 1) For information on the availability of the abrading fabric, write to Customer Services, Info
24、rmation Services Group, BSI, Linford Wood, Milton Keynes MK14 6LE.BS2782-8:Method 826A:1992 2 BSI 07-1999 Figure 1 Apparatus for measuring print adhesion Figure 2 Detail of abrading memberBS2782-8:Method 826A:1992 BSI 07-1999 3 Secure two strips of the abrading fabric (seeclause 6) to the brass peg
25、by means of the clip, as shown in Figure 2, so as to form a double thickness. The ribbed side of the fabric shall face the brass peg. Lower the peg with the fabric attached on to the test piece. Subject the test piece to abrasion at the rate specified for the apparatus (see clause4). Inspect the tes
26、t piece at intervals and note the number of cycles required to produce physical damage to the print, such as smudging or removal of the printed pattern or any area of it. Disregard any increase in brightness due to the polishing effect. 9 Expression of results Express the result as the number of cyc
27、les required to produce physical damage to the print. 10 Test report The test report shall include the following information. a) A complete identification of the material tested, including type, source, manufacturers code numbers and previous history. b) A reference to this British Standard method,
28、i.e. BS2782:Method826A. c) Time of conditioning of the test pieces (seeclause 7). d) The test result for each test piece and the nature of the damage to the print.4 blankBS2782-8:Method 826A:1992 BSI 07-1999 List of references (see clause 2) Normative references BSI standards publications BRITISH ST
29、ANDARDS INSTITUTION, London BS 2782, Methods of testing plastics. BS 2782-0:1982, Introduction. Informative references Other references 1 GREAT BRITAIN. Health and Safety at Work etc. Act1974. London: HMSO.BS 2782-8: Method 826A: 1992 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInsti
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