1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 4647:2010Rubber, vulcanized Determination of staticadhesion to textile cord H-pull testBS ISO 4647:2010 BRITISH STANDARDNational forewordThis British Standard is the UK im
2、plementation of ISO 4647:2010. Itsupersedes BS903-A48:1984 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/22, Physical testing of rubber.A list of organizations represented on this committee can beobtained on request to its secretary.This publicati
3、on does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 65428 2ICS 83.060Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority
4、of theStandards Policy and Strategy Committee on 31 October 2010.Amendments issued since publicationDate Text affectedBS ISO 4647:2010Reference numberISO 4647:2010(E)ISO 2010INTERNATIONAL STANDARD ISO4647Second edition2010-10-01Rubber, vulcanized Determination of static adhesion to textile cord H-pu
5、ll test Caoutchouc vulcanis Dtermination de ladhrence statique au cbl textile Essai darrachement en H BS ISO 4647:2010ISO 4647:2010(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited u
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10、ghtiso.org Web www.iso.org Published in Switzerland ii ISO 2010 All rights reservedBS ISO 4647:2010ISO 4647:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Principle .1 4 Materials .2 5 Apparatus.2 6 Calibration5 7 Test piece .5 7.1 Dimensions 5 7
11、.2 Preparation.5 7.3 Number of test pieces.8 8 Time interval between vulcanization and testing.8 9 Conditioning of test pieces 8 10 Test temperature .8 11 Procedure.9 11.1 Testing at standard laboratory temperature.9 11.2 Testing at elevated temperature 9 12 Expression of results9 13 Test report9 An
12、nex A (informative) Preparation of silicone-rubber-faced bars.11 Annex B (normative) Calibration schedule 13 BS ISO 4647:2010ISO 4647:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO m
13、ember 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 has the right to be represented on that committee. International organizations, governm
14、ental 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Dir
15、ectives, 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. Publication as an International Standard requires approval by at least 75 % of the member bo
16、dies 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 rights. ISO 4647 was prepared by Technical Committee ISO/TC 45, Rubber and rubber produc
17、ts, Subcommittee SC 2, Testing and analysis. This second edition cancels and replaces the first edition (ISO 4647:1982), which has been technically revised primarily concerning updating the references, including a reference to ISO 5893 for the apparatus, updating the test report format and the addit
18、ion of a calibration schedule. BS ISO 4647:2010INTERNATIONAL STANDARD ISO 4647:2010(E) ISO 2010 All rights reserved 1Rubber, vulcanized Determination of static adhesion to textile cord H-pull test WARNING Persons using this International Standard should be familiar with normal laboratory practice. T
19、his standard does not purport to address all of the safety 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. CAUTION Certain procedures specified in th
20、is International Standard may involve the use or generation of substances, or the generation of waste, that could constitute a local environmental hazard. Reference should be made to appropriate documentation on safe handling and disposal after use. 1 Scope This International Standard specifies a me
21、thod for the determination of the static adhesion of textile cord to vulcanized rubber using the H-pull test. It is applicable to cords made from natural or man-made fibres. The property levels obtained with this method are affected considerably by the history of the cord and the rubber compound. Th
22、e method yields data, however, on which a judgement as to the service quality of the material can be based. The method is primarily intended for use with tyre cord. However, it can be applied, if desired, to similar cords for use in other rubber products, but it is limited to cords of linear density
23、 not exceeding 800 mg/m (tex). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) appl
24、ies. ISO 5893, Rubber and plastics test equipment Tensile, flexural and compression types (constant rate of traverse) Specification ISO 18899:2004, Rubber Guide to the calibration of test equipment ISO 23529, Rubber General procedures for preparing and conditioning test pieces for physical test meth
25、ods 3 Principle The adhesion between a rubber and textile cord is assessed by measuring the force required to pull a single cord from a block of vulcanized rubber, the force being applied along the longitudinal axis of the cord and the length of cord embedded in the rubber being fixed (see Figure 1)
26、. The adhesion measured is essentially a shearing force acting at the cord-to-rubber interface. The two strips of rubber and the interconnecting cord form a test piece resembling the letter “H”, from which the test derives its name. BS ISO 4647:2010ISO 4647:2010(E) 2 ISO 2010 All rights reserved4 Ma
27、terials The materials comprise any combination of rubber compound, textile cord and adhesive agreed upon by both the cord user and the supplier. The vulcanizing conditions, both time and temperature, shall be exactly specified. Square-woven, approximately 340 g/m2cotton fabric, or its equivalent, sh
28、all be used to support the rubber strips. This may be grey fabric or fabric that has been frictioned on one side. Alternatively, the rubber compound may be calendered to the frictioned side of the cotton fabric. The rubber surface which will be in contact with the cords shall be protected by a prote
29、ctive film, for example starch paper or polyethylene. The thickness of the rubber compound required to fill the mould completely shall be determined by the supplier and the purchaser. NOTE The decision as to which rubber compound to use is normally made by the cord user. 5 Apparatus 5.1 Mould. The d
30、imensions of the test pieces are controlled by the specifications and tolerances of the mould. The test pieces are prepared by laying strips of rubber, of thickness Y/2 (see Figure 1), spaced a distance Z apart, into cavities in a mould of width C. Key 1 cord 2 rubber aDirection of applied force. Fi
31、gure 1 Test piece BS ISO 4647:2010ISO 4647:2010(E) ISO 2010 All rights reserved 3Cords are stretched over and perpendicular to the rubber strips, with a distance L between each cord. Two further strips of rubber are applied above the cord, the mould closed and put into a press, and the test pieces v
32、ulcanized. It is common practice to use moulds which allow many identical test pieces to be produced simultaneously as a test pad. One example of a suitable mould is shown in Figure 2. It is recommended that the width of the cord groove be 0,8 mm for cords of linear density 560 mg/m (tex) or less, a
33、nd 1,2 mm for cords of linear density more than 560 mg/m (tex) and up to 800 mg/m (tex). Although this form of mould is simple to use, the moulding pressure tends to force excess rubber down the cord groove between the rubber strips, particularly when the cord is much narrower than the groove. This
34、“flash” shall be removed from the cord by careful cutting before the test to improve the reproducibility of the results. The formation of this rubber flash can be almost completely eliminated by using a mould of the form shown in Figure 3, which shows two methods for preparing test pieces. The techn
35、ique requires the cord length between the rubber strips to be held in position during vulcanization by a deformable surface, rather than a groove, so that there are no voids into which excess rubber can flow. Dimensions in millimetres Key 1 four slots 0,8 mm or 1,2 mm wide and 3,0 mm deep, with all
36、burrs removed The mould shown will produce 16 test pieces. lt may be fabricated to produce a larger or smaller number, but the dimensions that govern the size of the test pieces may not be altered. aMaterial: hot-rolled steel. Figure 2 Suitable mould for H-pull test BS ISO 4647:2010ISO 4647:2010(E)
37、4 ISO 2010 All rights reservedDimensions in millimetres Key 1 mould frame 2 mould top plate 3 mould base plate 4 cord grooves, width 0,8 mm or 1,2 mm (see 5.1) 5 locating grooves for spacer bars R rubber cavity, width X and depth Y (see 5.1 and 7.1) S silicone-rubber-faced bar P plain spacer bar Fig
38、ure 3 Methods of preparation of test pieces BS ISO 4647:2010ISO 4647:2010(E) ISO 2010 All rights reserved 5In method A, the cord between the rubber strips R1and R2, and between R3and R4, is held between specially prepared silicone-rubber-faced bars. A suitable method for the preparation of such bars
39、 is described in Annex A. In method B, the upper strip of rubber is made sufficiently wide to cover the whole distance R5to R6(and R7to R8), with the addition of a thin cellophane or polyester strip applied to the central portion of the rubber, which contacts the cords, to prevent the adherence of r
40、ubber to the cord in this region. 5.2 Tensioning device, capable of providing a tensioning force of 0,49 N 0,1 N. This can be achieved, for example, by suspending a mass of 50 g 1 g on one end of each cord during assembly of the test piece and removing it prior to placing the mould in the vulcanizin
41、g press. The masses can be of the hook type or designed in such a manner that they can be clamped to the cord. In any event, the total mass shall be 50 g 1 g. 5.3 Tensile-testing machine, complying with the requirements of ISO 5893, capable of measuring force with an accuracy corresponding to class
42、1 and with a rate of traverse of the moving grip of 100 mm/min 10 mm/min. 5.4 Test piece grips, of a design as shown in Figure 4 or Figure 5. Two grips are required. NOTE The two types of grip do not necessarily give the same results. 6 Calibration The requirements for calibration of the test appara
43、tus are given in Annex B. 7 Test piece 7.1 Dimensions The standard test piece shall be a length of cord embedded in rubber strips, nominally 6,4 mm wide and 3,2 mm thick (see 5.1). Although this method specifies that the rubber strips shall be 3,2 mm thick, an interlaboratory test gave equivalent va
44、lues for 3,2-mm-thick and 6,4-mm-thick test pieces. The embedded length of cord may be reduced to 5 mm or increased to 10 mm where the adhesion is very high or very low respectively, but the results obtained using different embedded lengths are not comparable. 7.2 Preparation 7.2.1 Cut the rubber co
45、mpound into strips, 6 mm wide and of a suitable length, leaving the protective film attached. This can be done with scissors or with a clicker die cutter. 7.2.2 Cut strips of cotton fabric to the same dimensions as those of the rubber compound. (If the rubber compound is calendered onto the fabric,
46、do not carry out this step.) 7.2.3 If necessary, place the bottom spacer bars in the mould (Figure 3 type mould). 7.2.4 Using a mould at room temperature, place the fabric strips in the bottom of the mould cavities (see 7.2.11, second paragraph). 7.2.5 Place the rubber strips in the mould cavities w
47、ith the protective-film side on top. (If the rubber is calendered onto the fabric, the fabric side shall be on the bottom.) BS ISO 4647:2010ISO 4647:2010(E) 6 ISO 2010 All rights reservedDimensions in millimetres Dimension Value in mm A B CaD E F G H 1,6 12,5 25,0 40,0 7,0 14,0 4,0 2,0 aThis dimensi
48、on is the most important one and shall not be altered. All other dimensions are included for guidance and may be altered if desired. Break all sharp edges and corners with slight radii. The threaded hole is drilled and tapped to facilitate attaching the grip to the tester. Figure 4 Test piece grip B
49、S ISO 4647:2010ISO 4647:2010(E) ISO 2010 All rights reserved 7Dimensions in millimetres NOTE The lower part of the grip is spring loaded with a spring tension of between 5 N and 15 N to minimize deformation of the rubber. Figure 5 Alternative test piece grip 7.2.6 Remove the protective film from the rubber strips and immediately place the cords in the cord slots. The portion of the cord to be embedded in the rubber shall not be touched with bare hands. The procedure for handling calendered co
