1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12025 : 1997 The Eu
2、ropean Standard EN 12025 : 1996 has the status of a British Standard ICS 55.040; 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Self adhesive tapes Measurement of tear resistance by the pendulum methodBS EN 12025 : 1997 This British Standard, having been prepared under
3、 the direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference PKW/3 Draft for comment 92/43826 DC ISB
4、N 0 580 26796 2 Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PKW/3, Distribution packaging, transport packaging and unit loads, upon which the following b
5、odies were represented: British Adhesives and Sealants Association British Apparel and Textile Confederation British Coatings Federation Ltd. British Fibreboard Packaging Association British Glass Manufacturers Confederation British Industrial Truck Association British Plastics Federation British Re
6、tail Consortium British Rubber Manufacturers Association Ltd. British Tensional Strapping Association Ltd. British Timber Merchants Association British Wood Preserving and Damp-proofing Association Chamber of Shipping Chemical Industries Association China Clay Association Cranfield Logistics Departm
7、ent of Transport Engineering Equipment and Materials Users Association Federation of the Electronics Industry Flexible IBC Association Food and Drink Federation Independent Pallet Repair Committee Institute of Grocery Distribution Metal Packaging Manufacturers Association Ministry of Defence Nationa
8、l Association of Pallet Distributors Power Fastenings Association Pira International Road Haulage Association Ltd. Society of Occupational Medicine Storage Equipment Manufacturers Association Timber Packaging and Pallet Confederation Timber Research and Development Association United Kingdom Softwoo
9、d Sawmillers Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Adhesive Tape Manufacturers Association British Footwear Manufacturers Federation British Steel Industry (Wire Section) Packaging Distributors Association Pressure S
10、ensitive Manufacturers AssociationBS EN 12025 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 12025 3ii BSI 1997 BS EN 12025 : 1997 National foreword This British Standard has been prepared by Technical Committee PKW/3 and is the E
11、nglish language version of EN 12025 : 1996 Self adhesive tapes Measurement of tear resistance by the pendulum method, published by the European Committee for Standardization (CEN). Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This doc
12、ument comprises a front cover, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copy
13、right reserved to CEN members Ref. No. EN 12025 : 1996 E EUROPEAN STANDARD EN 12025 NORME EUROPE ENNE EUROPA ISCHE NORM May 1996 ICS 83.180 Descriptors: Adhesive tapes, tear tests, tear strength, pendulums English version Self adhesive tapes Measurement of tear resistance by the pendulum Rubans auto
14、-adhe sifs Mesure de la re sistance au de chirement par la me thode du pendule Klebeba nder Messung der Reifestigkeit mit der Pendelmethode This European Standard was approved by CEN on 1996-04-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditio
15、ns for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three off
16、icial versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria,
17、 Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12025 : 1996 BSI 1997 Foreword This European Standard has been prepared by Technical Committee CEN/TC 253, Self adhesive ta
18、pes, the Secretariat of which is held by AFNOR. This standard gives: the annex A (normative) Measurement of tear resistance of narrow adhesive tapes by the pendulum method. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endor
19、sement, at the latest by November 1996, and conflicting national standards shall be withdrawn at the latest by November 1996. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Bel
20、gium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative reference 3 3 Principle 3 4 Apparatus 3 5 Test samples and test pieces 3 6 Procedure
21、3 7 Expression of results 5 8 Test report 5Page 3 EN 12025 : 1996 BSI 1997 1 Scope This standard specifies the method to measure the force required to tear certain types of adhesive tapes under standard test conditions. Details of the test method depend upon the width of the adhesive tape under test
22、. For adhesive tapes less than 63,5 mm width it is necessary to use annex A (normative). 2 Normative reference This European Standard incorporates by dated or undated reference, provisions from these publications. These normative references are cited at the appropriate places in the text and the pub
23、lications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 1974 P
24、aper Determination of tearing resistance (Elmendorf method) 3 Principle A standard length of adhesive tape, having a small initial cut in it, is torn by means of a force applied suddenly. The force required to produce this tear is measured by means of a pendulum apparatus (e.g. Elmendorf). 4 Apparat
25、us Pendulum machine (see figure 1) of the test method is designed so that the test piece is held between two clamps and is torn by the fall of the pendulum under its own mass. The machine shall have the following characteristics: 4.1 Two clamps: a movable clamp carried on the pendulum and a fixed cl
26、amp. 4.2 A pendulum preferably formed by a sector of a wheel or circle, free to swing on a ball-bearing or other substantially frictionless bearing. The pendulum carries a circumferential graduated scale to indicate the force used in tearing the test piece. 4.3 When the pendulum is in the raised pos
27、ition, the moveable clamp shall lie in the same plane as the fixed clamp, forming, in effect, an extension to the fixed clamp. This plane shall be perpendicular to the plane of oscillation of the pendulum. The gripping surface of the jaws in each clamp shall be not less than 25 mm wide and 16,5 mm d
28、eep. The clamps shall be 2,5 mm apart. 4.4 Pointer and pointer-stop arranged to record the maximum arc of swing of the sector pendulum. 4.5 Sector release to hold the pendulum in a raised position during the mounting of the test piece and enable it to fall under its own weight. 4.6 Knife attachment
29、for initial slitting of the test piece. 4.7 The knife attachment is located to slit the test piece midway between the clamps at right angles to the upper edge of the clamps. The slit shall extend from the bottom edge of the test piece to a point 4 mm above the top edge of the clamps, leaving a dista
30、nce of 43 mm of uncut test piece perpendicular to the long dimension of the test piece. 4.8 The perpendicular distance between the upper edge of the jaws and the axis of the pivot point of the pendulum should be 104 mm. The line joining the upper edge of the jaws and the axis of the pivot point shou
31、ld make an angle of 27 309 with the plane of the test piece. 5 Test samples and test pieces Rolls should not be less than 63,5 mm wide. Condition the sample roll for 24 h at 23 C 2C and 50 % 5 % relative humidity. Discard the three outer turns of the roll. Perform the test on five test pieces in eac
32、h of the warp and weft directions. The test pieces shall be rectangles 63,5 mm 3 101,6 mm. The long dimensions shall be parallel to the warp for warp tests and parallel to the weft for weft tests. If adhesive tape with non-woven backing is under test, take five test pieces in longitudinal or transve
33、rse direction as appropriate. 6 Procedure 6.1 Standard test conditions The test shall be carried out at 23 C 2 C and 50 % 5 % relative humidity. 6.2 Calibration of apparatus Before taking any measurements, it is important to calibrate the apparatus according to ISO 1974. 6.3 Place the test piece sec
34、urely in the clamps. A piece of protective paper or film not larger than the clamps may be used to cover the adhesive surfaces within the clamps. By means of the knife blade, cut a slit in the test piece starting at the bottom edge and perpendicular to it and ending 43 mm from the top edge. The accu
35、racy of the readings obtained with the apparatus depends to a great extent on the exactness of this 43 mm of uncut test piece. 6.4 Press the sector release, causing the sector to fall. This moves the clamp attached to the pendulum away from the fixed clamps and tears the test piece. Measure the forc
36、e required to tear the test piece by reading the scale to the nearest division.Page 4 EN 12025 : 1996 BSI 1997 Figure 1. Tear test machine (Elmendorf type)Page 5 EN 12025 : 1996 BSI 1997 6.5 Reject the readings obtained in those cases where the tear deviates more than 10 mm from the line of the init
37、ial slit. Similarly, reject readings where the edge of the test piece above the movable jaw rubs against the sector during tearing. 6.6 If the scale is not in direct units of forces, multiply the scale reading by the appropriate factor given below or in the manufacturers instruction, which takes int
38、o account the capacity of the instrument. Multiplication factors for apparatus (Elmendorf type) are as follows: Factor Capacity in newtons Standard instrument (without augmenting mass) 16 15,7 Standard instrument (with NBS augmenting mass) 32 31,4 Heavy-duty instrument (without augmenting mass) 1 62
39、,8 Heavy-duty instrument (with one augmenting mass) 1 125,6 Heavy-duty instrument (with two augmenting masses) 1 251,2 For other types of equipment refer to the manufacturers instructions. 7 Expression of results Express the tearing strength as the arithmetic mean (i.e. average) of the results obtai
40、ned from the test pieces tested in each of the warp and weft directions, or as appropriate. Report the results separately in each direction in newtons equivalent to the nearest full-scale division. 8 Test report The test report shall include the following information: a) a reference to this European
41、 Standard; b) all information necessary to identify the test sample; c) the date of the test; d) the results obtained; e) any operation not specified in this European Standard that may affect the results.Page 6 EN 12025 : 1996 BSI 1997 Annex A (normative) Measurement of tear resistance of narrow adh
42、esive tapes by the pendulum method A.1 Scope This annex specifies the method to measure the force required to tear certain types of narrow adhesive tapes under standard test conditions. EN 12025 requires the use of 63,5 mm wide adhesive tape. As this width is not a common one, it is frequently neces
43、sary to produce a wide adhesive tape specially for the test. It would be an advantage for the user to have a test which can use narrower tape even though this only gives an approximate result. Even so this annex is applicable only to samples of 25,4 mm width or above. A.2 Normative reference This Eu
44、ropean Standard incorporates by dated or undated reference, provisions from these publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publicatio
45、ns apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 1974 Paper Determination of tearing resistance (Elmendorf method) A.3 Principle Two adhesive tapes are placed one on the top
46、 of the other, as shown figure A.1 in such a way that one of the two has a slightly smaller width than the length of the initial cut (20,5 mm) quoted in EN 12025. A tear in the uncut portion of the second adhesive tape which is to be tested is produced by means of the tearing tester (Elmendorf type)
47、. The result is multiplied by the ratio of the standard tearing width (43 mm) to the tearing width of adhesive tape under test. A.4 Apparatus Pendulum machine (see figure 1) of the test method is designed so that the test piece is held between two clamps and is torn by the fall of the pendulum under
48、 its own mass. The machine shall have the following characteristics: A.4.1 Two clamps: a movable clamp carried on the pendulum and a fixed clamp. A.4.2 A pendulum preferably formed by a sector of a wheel or circle, free to swing on a ball-bearing or other substantially frictionless bearing. The pend
49、ulum carries a circumferential graduated scale to indicate the force used in tearing the test piece. A.4.3 When the pendulum is in the raised position, the movable clamp shall lie in the same plane as the fixed clamp, forming, in effect, an extension to the fixed clamp. This plane shall be perpendicular to the plane of oscillation of the pendulum. The gripping surface of the jaws in each clamp shall be not less than 25 mm wide and 16,5 mm deep. The clamps shall be 2,5 mm apart. A.4.4 Pointer and pointer-stop arranged to re
