1、DEUTSCHE NORM December 1999 Touch and close fasteners Determination of peel strength English version of DIN EN 12242 I DIN - EN 12242 ICs 61 .O40 Haftverschlsse - Bestimmung der Abschlfestigkeit Supersedes parts June 1990 edition, withdrawn in January 1997. of DIN 3415-2, European Standard EN 12242
2、: 1999 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by CEN/TC 248. The responsible German body involved in its preparation was the Normenausschuss Textil und Textil- maschinen (Textile and Textile Machinery Standards Commi
3、ttee), Technical Committee Textile Haftver- schlsse. Amendments Parts of DIN 341 5-2, June 1990 edition, have been superseded by the specifications of DIN EN 12242. Previous edition DIN 341 5-2: 1990-06. EN comprises 9 pages. No pari of this standard may be reproduced without the prior permission of
4、 Y Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, s the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN EN 12242 : 1999-1 English price group O7 Sales No. 1107 05.00 EUROPEAN STANDARD NORME EUFIOPEENNE EUROPISCHE NORM EN 12242 October 1
5、999 ICs 61 .O40 English version Touch and close fasteners Determination of peel strength Fermetures auto-agrippantes - Dtermination de la rsistance au pelage Haftverschlsse - Bestimmung der Abschlfestigkeit This European Standard was approved by CEN on 1999-09-05. CEN members are bound to comply wit
6、h the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand- ards may be obtained on application to the Central Secretar
7、iat or to any CEN member. The European Standards exist in three official 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
8、versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardi
9、zation Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1999. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 12242 : 1999 E Page 2 EN 12242 : 1999 Foreword
10、This European Standard has been prepared by Technical Committee CEN/TC 248 “Textiles and textile products“, the secretariat of which is held by BSL 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
11、April 2000, and conflicting national standards shall be withdrawn at the latest by April 2000. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, F
12、inland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. It is one of a series of standards for touch and close fasteners. Other standards in the series are as follows: EN 14 14 Touch and close fasteners -
13、 Cycling procedures for subsequent testing EN 1415 Touch and close fasteners - Behaviour of slit selvedges EN 1416 Touch and close fasteners - Determination of curvature EN 12240 Touch and close fasteners - Determination of the overall and effective width of tapes and the effective width of a closur
14、e. EN 1224 1 : 1999 Touch and close fasteners - Method for closure prior to washing or dry cleaning EN 12243:1999 Touch and close fasteners - Determination of dimensional change in washing and drying and dry cleaning. EN XXXX I) Touch and close fasteners - Determination of longitudinal shear strengt
15、h. EN XXXX I) Touch and close fasteners - Determination of vertical tension strength. EN XXXX ) Touch and close fasteners - Resistance to fraying of tapes after cutting. EN XXXX I) Touch and close fasteners - Specification. The Annex A of this European Standard is informative. ) In preparation Page
16、3 EN 12242 : 1999 1 Scope This European Standard specifies a method for determining the peel strength of a touch and close fastener. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at t
17、he appropriate places in the text and the publications 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 th
18、e publication referred to applies. EN 20139 Textiles - Standard atmospheres for conditioning and testing (IS0 139:1973) EN 10002 Metallic materials - Tensile testing EN 12240 Touch and close fasteners - Determination of the overall and effective widths of tapes and the effective width of a closure 3
19、 Principle Mated component tapes of a touch and close fastener are separated at a constant rate in a peeling action from an open edge of a prepared closure.This is carried out such that the separation occurs progressively along the closure in a direction parallel to the length of the tapes forming t
20、he closure. 4 Definitions For the purposes of this European Standard, the following definition applies: 4.1 peel strength: Force per unit effective width required to separate the two tapes forming the specified closure from an open edge under the specified conditions of test. 5 Apparatus 5.1 Constan
21、t rate of extension tensile testing machine as specified in EN 10002, connected to a computer, via a suitable interface, capable of recording data at a rate of at least 20 points per second. NOTE: Graphical interpretation has proved to be unreliable. 5.2 Metal roller, made of phosphor-bronze with a
22、diameter of (100 Ifr 2 )mm (see figure 2) which shall be selected in accordance with table 1 : Page 4 EN 12242 : 1999 Effective width of closure Was determined by EN 12240 Metal roller mass mm kg w 2 12,0 12,o w 5 250 25 ,o W 5 52,O Note. The most important parameters for the roller are its diameter
23、 and mass. Its width should be chosen in accordance with the specific density of the phosphor-bronze used in its manufacture. l,o f 0,l 2,5 * 0,l 5,O f 0,l 5.3 Set of forks with a handle (see figure 3) which engages the metal roller (5.2) and allows the roller to be moved without any extra down forc
24、e being applied (see figure 4). 6 Test specimens Cut 12 test specimens of both male and female components at least 100 mm long and mark each with an X at one end and Y at the other end, such that each test specimen of like tape is marked identically. 7 Conditioning Condition the test specimens for a
25、 minimum of 24h in accordance with the standard temperate atmosphere for testing as specified in EN 20139. The closing of the test specimens and the testing of the touch and close fasteners shall also take place under these conditions. 8 Procedure 8.1 Combinations of closure Twelve closures in total
26、 shall be made, three closures being made for each of the four combinations shown in figure 1. w 52,o 10,o f 0,l Page 5 EN 12242 : 1999 t X X -9,5- - V C) Figure 1: Peel strength Key : 1 Choose roller width to meet specified mass Figure 2: Metal roller Page 6 EN 12242 : 1999 Dimensions in millimetre
27、s I- l O0 II Cil + Key: 1 Handle 2 Forks 3 Space between the forks to be 2 mm greater than the roller width. Figure 3: Set of forks with a handle I I I I Figure 4: Rolling mechanism for touch and close fasteners Page 7 EN 12242 : 1999 8.2 Method of closure Make each closure as follows: Place the mal
28、e tape on a flat surface with the pile uppermost and then place the female tape on top with the pile facing downwards so that the full length and width of the tapes make a closure, using minimal hand pressure. Traverse the metal roller (5.2), at a rate of approximately 200 mds along the tapes in one
29、 direction then immediately reverse and traverse in the other direction then turn the mating tapes over. Repeat the procedure until the roller has traversed the mating tapes five times in each direction i.e. a total of ten times. Take care that the centre of gravity of the roller does not deviate fr
30、om the centre line of the tapes during this operation. Take care that the roller covers the entire width of the mating tapes NOTE. The tapes are turned over to minimize curvature. 8.3 Conducting the test For each closure: Partly peel open the closure by hand, taking care to leave at least 50 mm of c
31、losure. Set up the tensile testing machine (5.1) such that the jaws are 50 mm apart. Mount thc combined test specimen into the jaws of the tensile testing machine (5.1) such that the free end of the female tape is in the upper jaw and the free end of the male tape is in the lower jaw, taking care to
32、 align the test specimen in order that the force applied is uniformly distributed across the width of the closure. Set the tensile machine in motion at a constant rate of jaw separation of (100 mm f 10 mm)/min. Record force against jaw separation at a rate of at least 20 points per second with the c
33、omputer, until at least 50 mm of the closure has been separated. 9 Calculation and expression of results 9.1 Calculation of the arithmetic means of the separation force For each closure: From the curve of load versus jaw separation calculate the arithmetic mean of the separation force for all the po
34、ints between 25 mm and 75 mm jaw separation, and express this as the average peeling force, in newtons. (See annex A). Page 8 EN 12242 : 1999 9.2 Calculation of the arithmetic mean of the average peeling forces For each combination: Calculate the arithmetic mean of the average peeling forces of the
35、three test specimens for each combination of closure. Calculate the peel strength of the combination by dividing the arithmetic mean of the average peeling forces by the effective width of the closure. 9.3 Calculation of the mean peel strength Calculate the mean peel strength of the closure by calcu
36、lating the arithmetic mean of the peel strengths of the four combinations. 9.4 Expression of the minimum peel strength Express the minimum peel strength of the closure as the minimum of the peel strengths of the four combinations. 9.5 Expression of the maximum peel strength Express the maximum peel
37、strength of the closure as the maximum of the peel strengths of the four combinations. 10 Test report Report the following information: a) number and date of this European Standard; b) date of the test: c) a complete identification of the touch and close fastener tapes; d) the minimum and maximum pe
38、el strengths for the four combinations, and the mean peel strength of the closure; e) any deviation from this standard and any incident likely to have affected the results. Page 9 EN 12242 : 1999 ANNEX A (Informative) Typical example of a load versus jaw seperation curve. Typical example of a load versus jaw separation curve for a touch and close fastener, encountered during a peel strength test. O! 1 I I I I O 20 40 60 80 100 Key: 1 Load, N 2 Extension, mm
