1、BRITISH STANDARD BS EN ISO 4674-2:1998 Incorporating Corrigendum No.1 Rubber- or plastics-coated fabrics Determination of tear resistance Part 1: Ballistic pendulum method The European Standard EN ISO4674-2:1998 has the status of a BritishStandard ICS 59.080.40BSENISO 4674-2:1998 This British Standa
2、rd, having been prepared under the directionof the Sector Board forMaterials and Chemicals, waspublished under the authorityof the Standards Boardand comes into effect on 15 July1998 BSI05-1999 ISBN 0 580 29751 9 National foreword This British Standard is the English language version of EN ISO4674-2
3、:1998. It is identical with ISO4674-2:1998. The UK participation in its preparation was entrusted to Technical Committee TCI/78, Coated fabrics, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, o
4、r proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that C
5、EN and CENELEC standards normally include an annex which lists normative references to international publications with their corresponding European publications. The BritishStandards which implement international or European publications referred to in this document may be found in the BSI Standards
6、 Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for t
7、heir correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENISO title page, page2, the ISO title page, pages ii to iv, pages1 to6, aninside
8、back cover anda 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 cover. Amendments issued since publication Amd. No. Date Comments 10277 Corrigendum October1998 Indicated by a s
9、ideline in the marginBSENISO 4674-2:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Foreword iii Text of ISO 4674-2 1ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO4674-2 May1998 ICS59.080.00 Descriptors: See ISO document English version Rubber- or p
10、lastics-coated fabrics Determination of tear resistance Part2: Ballistic pendulum method (ISO4674-2:1998) Supports textiles revtus de caoutchouc ou de plastique Dtermination de la rsistance au dchirement Partie2:Mthode au mouton-pendule (ISO4674-2:1998) Mit Kautschuk oder Kunststoff beschichtete Tex
11、tilien Bestimmung der Weiterreifestigkeit Teil2: Verfahren mit ballistischem Pendel (ISO4674-2:1998) This European Standard was approved by CEN on2 March1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard th
12、e 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 official versions (English, French, German
13、). 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, Belgium, CzechRepublic, Denmark, Finla
14、nd, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Bru
15、ssels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO4674-2:1998 EENISO 4674-2:1998 BSI 05-1999 2 Foreword The text of the International Standard ISO4674-2:1998 has been prepared by Technical Committee ISO/TC45 “Rubber and
16、 rubber products” in collaboration with Technical Committee CEN/TC248 “Textiles and textile products”, the secretariat of which is held by BSI. 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 mont
17、h of November1998, and conflicting national standards shall be withdrawn at the latest by November1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, D
18、enmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom. Endorsement notice The text of the International Standard ISO4674-2:1998 was approved by CEN as a European Standard without any modification.
19、 NOTENormative references to international standards are listed in Annex ZA (normative). Contents Page Foreword 2 Introduction 1 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Sampling 2 6 Test pieces 2 7 Time-lapse between manufacture and testing 2 8 Conditioning 2 9 Procedure 2 1
20、0 Expression of results 1 11 Test report 1 Annex A (normative) Adjustment and calibration 5 Annex ZA (normative) Normative references tointernational publications with their relevantEuropean publications 7 Figure 1 Test piece designs 3ENISO4674-2:1998 ii BSI 05-1999 Foreword ISO (the International O
21、rganization 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 estab
22、lished has 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 standardizat
23、ion. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO4674-2 was prepared by Technical Committee I
24、SO/TC45, Rubber and rubber products. Together with part1 of ISO4674, this first edition of ISO4674-2 cancels and replaces the first edition of ISO4674 (ISO4674:1977), which has been technically revised. ISO4674 consists of the following parts, under the general title Rubber- or plastics-coated fabri
25、cs Determination of tear resistance: Part 1: Constant rate of tear methods; Part 2: Ballistic pendulum method. Annex A forms an integral part of this part of ISO4674. Descriptors: Fabrics, woven fabrics, coated fabrics, fabrics coated with rubber, fabrics coated with plastics, tests, mechanical test
26、s, tear tests.ENISO 4674-2:1998 BSI 05-1999 1 Introduction Tearing is amongst the more usual ways of destruction for many thin materials such as paper, coated or uncoated textiles, plastics films and leather. Knowledge of the resistance of these materials to this type of behaviour is therefore very
27、important. In practice, tearing can result from very different circumstances; hence the large number of test methods that have been developed in order to predict the behaviour of materials in various situations. The present International Standard deals with initiated tearing, i.e.the propagation of
28、a tear from an initiating cut. It consists of the following two parts: Part 1: Constant rate of tear methods; Part 2: Ballistic pendulum method. The first part describes two methods using a tensile-testing machine at constant rate of elongation. The second part describes a dynamic method using the k
29、inetic energy of a falling pendulum. Other methods, for example the “wounded burst test”, are under consideration as possible further parts. WARNING Persons using this part of ISO4674 should be familiar with normal laboratory practice. This part of ISO4674 does not purport to address all of the safe
30、ty problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This part of this ISO4674 describes a method for the determination of tear resistance base
31、d on the action of an active force applied to a notched test piece. The test may be carried out on: test pieces that have been conditioned in a standard atmosphere, or test pieces that have undergone pre-treatment, e.g.water immersion. The results obtained by this method are not to be compared with
32、those obtained by methods involving constant rate of tear. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO4674. At the time of publication, the editions indicated were valid. All standards are subject
33、to revision, and parties to agreements based on this part of ISO4674 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO2231:1989, Rubber- or pla
34、stics-coated fabrics Standard atmospheres for conditioning and testing. ISO2286-2:1998, Rubber- or plastics-coated fabrics Determination of roll characteristics Part2:Methods for determination of total mass per unit area, mass per unit area of coating and mass per unit area of substrate. 3 Principle
35、 A sudden force is applied to a notched test piece. This force is generated by a pendulum. The amplitude of the first oscillation enables the tearing force to be measured. 4 Apparatus 4.1 Test machine of the pendulum type, in which the test piece is held between two jaws, one movable and the other f
36、ixed, the clamping faces of which shall be in the same plane when the apparatus is in its starting position. The moving jaw is attached to a pendulum which can fall under the influence of gravity. The apparatus is made up of the following parts: 4.1.1 Rigid framework, supporting the pendulum and the
37、 fixed jaw, as well as the knife and measuring device. It is fitted with a level and positioned to prevent any movement during the test, for example by securing it by means of threaded bolts on a rigid table. 4.1.2 Pendulum, that is free to swing about a horizontal axis on roller bearings, with mean
38、s for holding the pendulum in the raised starting position and releasing it instantly. The weight of the pendulum may be altered by adding additional masses or by exchanging pendulums, thus giving the possibility of several measuring scales. 4.1.3 Mechanical or electronic device, for determining the
39、 maximum amplitude of the first swing, and thus the energy used to tear the test piece. The reading may be given directly in terms of tearing force. 4.1.4 Movable jaw, integral with the pendulum, and fixed jaw, integral with the framework.ENISO 4674-2:1998 2 BSI 05-1999 These jaws shall be2,8mm 0,3m
40、m apart in order to permit the passage of the knife. When the pendulum is in its starting position, the clamping faces of the jaws shall be in the same plane, perpendicular to the plane of swing of the pendulum. The jaws shall be so aligned that the test piece lies in a vertical plane parallel to th
41、e axis of the pendulum. The distance between the clamping line of the jaws and the pendulum axis shall be104mm1mm. The plane containing the clamping line and the axis of the pendulum shall make an angle of27,5 0,5 to the perpendicular. The surface state of the clamping faces and the force applied to
42、 the jaws shall permit the test pieces to be held without slipping. Closing of the jaws may be achieved by pressure systems. The dimensions of the clamping faces are not critical. A width of30mm to40mm and a height of15mm to20mm have been found to be suitable. 4.1.5 Knife, to begin the tear in the t
43、est piece by cutting a slit mid-way between the two jaws. Instructions for adjusting and calibrating the apparatus are given in Annex A. 4.2 Hollow punch or template, for cutting out the test pieces. 5 Sampling Samples shall be cut in such a way as to be as representative as possible of the batch be
44、ing examined. The test pieces shall be cut from the usable width of the coated fabric in accordance with ISO2286-2, and from the full length of the roll. For tests for tearing in the longitudinal direction, the test pieces shall be selected so that their length is perpendicular to the longitudinal e
45、dge of the coated fabric. For tests for tearing in the transverse direction, the test pieces shall be selected so that their length is parallel to the longitudinal edge of the coated fabric. For coated woven or knitted textiles, care shall be taken to divide the test pieces so that the same warp yar
46、n or weft yarn, or the same column or row of knitting, is not found in more than one test piece for the same direction to be tested. 6 Test pieces 6.1 Shape and dimensions Cut out test pieces using a hollow punch or template, preferably of one of the designs shown in Figure 1. Test pieces of differe
47、nt shapes and dimensions may, however, also be used, provided that: the length to be torn is43mm 0,5mm; a notch between5mm and15mm is made in the upper edge in order to prevent the last threads from fraying; the width and general shape of the test pieces are such that none of the torn parts rub agai
48、nst the framework or the pendulum. 6.2 Number For each series of tests, select ten test pieces: five in the longitudinal direction and five in the transverse direction. 7 Time-lapse between manufacture and testing The minimum time-lapse between manufacture and testing shall be16h. 8 Conditioning Con
49、dition the test pieces in one of the standard atmospheres defined in ISO2231. If tests are to be carried out on wet test pieces, immerse the test pieces completely for a minimum of1h at23C 3 C in an aqueous solution of a wetting agent of concentration not more than1%(m/m), then thoroughly rinse in water and test within1min of removal from the water. 9 Procedure Before testing materials for the first time, pre-test in order to select the weight of the pendulum so that measurements made on the test pieces give r
