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IS 7016-4: Methods of Test for Coated and Treated Fabrics, Part 4: Rubber - or Plastics-Coated Fabrics - Determination of Resistance to Damage by Flexing PDF

15 Pages·2003·1.4 MB·English
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Preview IS 7016-4: Methods of Test for Coated and Treated Fabrics, Part 4: Rubber - or Plastics-Coated Fabrics - Determination of Resistance to Damage by Flexing

इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 7016-4 (2003): Methods of Test for Coated and Treated Fabrics, Part 4: Rubber - or Plastics-Coated Fabrics - Determination of Resistance to Damage by Flexing [PCD 13: Rubber and Rubber Products] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 7016 (Part 4): 2003 ISO 7854:1995 Indian Standard METHODS OF TEST FOR COATED AND TREATED FABRICS PART 4 RUBBER-OR PLASTICS-COATED FABRICS — DETERMINATION OF RESISTANCETO DAMAGE BY FLEXING ( Second Revision) ? ICS 59.080.40 :., b @BIS 2003 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 April 2003 PriceGroup 5 ,. Rubber and Rubber Products Sectional Committee, PCD 13 NATIONAL FOREWORD This Indian Standard ( Part 4 ) ( Second Revision ) which is identical with ISO 7854:1995 ‘Rubber- or plastics-coated fabrics — Determination of resistance to damage by flexing’ issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendations of the Rubber and Rubber Products Sectional Committee and approval of the Petroleum, Coal and Related Products Division Council. This standard was first published in 1973 and revised in 1987. In the first revision certain changes had been made in the test procedure, dimension of test pieces and the assessment and expression of results in order to update the standard and align with ISO 7854 : 1984 ‘Rubber- or plastics-coated fabrics — Determination of resistance to damage by flexing ( dynamic method )’. The Committee therefore decided to revise this standard to completely align with ISO 7854:1995. The text of ISO Standard has been proposed to be approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’. b) Comma ( ,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point ( .) as the decimal marker. Inthis adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated. However, that International Standard cross-referred in this adopted ISO Standard which has subsequently been revised, position in respect of latest ISO Standard has been given: International Standard Corresponding Indian Standard Degree of Equivalence LSO132:1983 Rubber, vulcanize d — Nil — Determination of flex cracking ( De Mattia ) ISO 1420:1987 Rubber-or plastics- IS 7016 ( Part 7 ) :1986 Methods Technically equivalent coated fabrics — Determination of of test for coated and treated fabrics: with minor variation resistance to penetration by water Part 7 Determination of resistance to penetration by water ( first revision) ISO 2231 :1989 Rubber- or plastics Nil — coated fabrics — Standard atmospheres for conditioning and testing ISO 2286:1986 Rubber-or plastics- IS 7016 ( Part 1 ) :1982 Methods Technically equivalent coated fabrics — Determination of of test for coated and treated fabrics: with minor variation roll characteristics Part 1 Roll characteristics ( first revision ) In case of ISO 132:1983 and ISO 2231 :1989, the Committee, responsible for the preparation of this standard, took cognizance of these standards and decided that they are acceptable for use in conjunction with this standard. For tropical countries like India, the standard temperature and the relative humidity shall be taken as 27 * 2°C and 65 * 5 percent respectively. IS 7016 (Part 4) :2003 ISO 7854:1995 Indian Standard METHODS OF TEST FOR COATED AND TREATED FABRICS PART 4 RUBBER- OR PLASTICS-COATED FABRICS — DETERMINATION OF RESISTANCETO DAMAGE BY FLEXING ( Second Revision) 1 Scope tween a pair of flat grips, one of which reciprocates, causing the folded test piece to be bent outwards five This International Standard describes three methods times per second. This high-speed folding of the test of assessing the resistance of coated fabrics to dam- piece is continued for either a pre-set number of cy- age by repeated flexing. cles or until damage to the test piece is apparent. 2 Normative references 3.2 Apparatus The following standards contain provisions which, 3.2.1 Flex-testing machine, as specified in through reference in this text, constitute provisions ISO 132, with pairs of flat grips. One of the grips of of this International Standard. At the time of publi- each pair is capable of a reciprocating motion in a cation, the editions indicated were valid. All standards vertical plane with a stroke length of (57 ‘}5) mm and are subject to revision, and parties to agreements a frequency of 5,0 Hz ~ 0,2 Hz. based on this International Standard are encouraged to investigate the possibility of applying the most re- Each pair of grips is positioned so that they are cent editions of the standards indicated below. 70 mm + 1 mm apart when in the open position and Members of IEC and ISO maintain registers of cur- 13 mm + 0,5 mm apart when in the closed position. rently valid International Standards. ISO 132:1983, Rubber, vulcanized — Determination 3.3 Preparation of test pieces of flex cracking (De Mattia). Select six test pieces each 37,5 mm + 1 mm wide x ISO 1420:1987, Rubber- or plastics-coated fabrics — 125 mm long from the usable width of the roll as de- Determination of resistance to penetration by water. fined in ISO 2286. Three test pieces shall be selected with their longer dimension in the longitudinal direc- ISO 2231:1989, Rubber- or p/astics-coated fabrics — tion of the roll of coated fabric and three test pieces Standard atmospheres for conditioning and testing. with the longer dimension in the transverse direction of the roll of coated fabric. Test pieces shall be se- ISO 2286:1986, Rubber- or p/astics-coated fabrics — lected from positions evenly spaced across the full Determination of rol/ characteristics. width and length of the sample. NOTES 3 Method A — De Mat&ia method 1 Inthe case of woven-fabric substrates, asfar aspossible no two test pieces should contain the same threads of the 3.1 Principle fabric in the direction to be tested. A rectangular strip of coated fabric is folded twice so 2 Together with suitable increases in the width of grips, that its long edges meet forming a strip measuring the test piece size may be increased so as to permit sub- 125 mm x 12,5 mm. This folded strip is mounted be- sequent hydrostatic-head tests to be conducted. 1 IS 7016 (Part 4) :2003 ISO 7854: 1995 3.4 Conditioning and testing atmosphere or breakdown of the coated fabric is to be deter- mined, stop the apparatus at predetermined intervals Condition the test pieces in atmosphere A, B or C of to allow examination of the test piece. ISO 2231:1989, and conduct the test in that atmos- phere. 3.6 Examination of test pieces 3.5 Procedure Fold each test piece twice as illustrated in figure 1, Examine the test pieces initially whilst retained in the with the coating to be tested outermost, along lines grips of the flexing apparatus or, if required, remove 12,5 mm from each of the longer edges and to a the test pieces from the grips for a more detailed in- width of 12,5 mm. Mount each folded test piece be- spection in accordance with clause 6. Test pieces re- tween a pair of grips whilst they are in the open pos- moved from the grips shall not be remounted. ition so that the test piece is slightly taut and so that Terminate flexing either at the specified number of the coating on the centre section of the test piece cycles or at the first inspection at which test pieces will be subjected to an outward fold. Move the grips show signs of deterioration or cracking of the type together by hand and guide each test piece into afold under investigation. Where relevant, record at each at approximately the midpoint (see figure 1). examination the total number of flexes to which the Set the apparatus in motion and stop it after the test pieces have been subjected and assess the flex- specified number of cycles or, if the point of failure ing damage in accordance with clause 6. Fold 1 --------------------------------------------------------------------------------- Fold 2 _________________________________________________________________________________ All folded plies to remain incontact Fold 2 Figure 1 — Illustration of folding and configuration of test piece for De Mattia method 2 IS 7016 (Part 4) :2003 ISO 7854:1995 3.7 Test report ISO 2286. Three test pieces shall be selected with their longer dimension in the longitudinal direction of The test report shall include the following particulars: the roll of coated fabric and three test pieces with their longer dimension in the transverse direction of a) a reference to this method of test, i.e. Method A the roll of coated fabric. Test pieces shall be selected of ISO 7854:1 995; from positions evenly spaced across the full width and length of the sample. b) all details necessary for the identification of the coated fabric, including any relevant reference NOTE 3 In the case of woven-fabric substrates, as far as number; possible no two test pieces should contain the same threads of the fabric in the direction to be tested. c) the specified number of flexes for which the test was run and at which the examination was made 4.3.2 Test pieces for subsequent and/or the number of flexes at final inspection; hydrostatic-head testing d) the severitv of damage at each inspection, re- When hydrostatic-head tests are to be subsequently ported in accordance with clause 6; conducted in accordance with method B of ISO 1420:1987, the test piece size used for flexing e) details of any deviation from the standard test shall be 105 mm x 65 mm and the test piece for procedure. hydrostatic-head testing shall be taken from the cen- tral portion of the flexed test piece. 4 Method B — Schildknecht method 4.4 Condtiioning and testing atmosphere Condition the test pieces in atmosphere A, B or C of 4.1 Principle ISO 2231:1989, and conduct the test in that atmos- phere. A rectangular strip of coated fabric is mounted around two opposing cylinders so that the test piece takes a 4.5 Procedure cylindrical form. One of the cylinders reciprocates along its axis, causing the coated-fabric cylinder to be Mount each test piece, with the coating to be evalu- alternately compressed and relaxed, thus inducing ated outermost, around two opposing cylinders that foldk in the test piece. This folding of the coated-fabric are in the fully open position with the length of the cylinder is continued for either a pre-set number of test piece around the circumference of the cylinders. cycles or until damage to the test piece is apparent. Secure the test pieces into position on each cylinder by means of a clip (4.2.2). Ensure that the distance 4.2 Apparatus between the inside faces of the attachment clips (4.2.2) k 36 mm + 1 mm. When using enlarged test 4.2.1 Test machine, consisting of a pair or pairs of pieces 65 mm wide (see 4.3.2), the free length of metal cylinders suitably mounted so that the axes of unclamped test piece shall be 44 mm A 1 mm (see each pair lie along an arc having a radius of not less figure 2). than 450 mm. The cylinders are 25,4 mm * 0,1 mm in external diameter and one cylinder of each pair is Set the apparatus in motion and stop it after the capable of a reciprocating motion along its axis at a specified number of cycles or, if the point of failure frequency of 8,3 HZ -+0,4 Hz. The stroke length of or breakdown of the coated fabric is to be deter- the reciprocating cylinder is 11,7 mm ~ 0,35 mm. mined, stop the apparatus at predetermined intervals to allow examination of the test piece. 4.2.2 Hose clips or tool clips, 10 mm * 1 mm wide, to attach the test pieces to the cylinders. 4.6 Examination of test pieces 4.3 Preparation of test pieces Examine the test pieces initially whilst retained in the clips around the mounting cylinders or, if required, 4.3.1 General remove the test pieces from the clips for a more de- tailed inspection in accordance with clause 6. Test Select six test pieces each 105 mm long x 50 mm pieces removed from the clips shall not be re- wide from the usable width of the roll as defined in mounted. 3 IS 7016 (Part 4) :2003 ISO 7854:1995 Dimensions in millimetres ‘0’’’’”+ T T 7 - ODenDosition A T_’1 --L Stroke length 11,7 * 0,35 — Coated-fabric 1 test piece Hose clip rotating cylinder a) Standard 105 mmx 50 mmtest piece b) Enlarged 105 mmx 65 mm test piece Figure 2 — Mounting the test pieces Terminate flexing either at the specified number of c) the specified number of flexes for which the test cycles or at the first inspection at which test pieces was run and at which the examination was made show signs of deterioration or cracking of the type and/or the number of flexes at final inspection; under investigation. Where relevant, record at each examination the total number of flexes to which the d) the severity of damage at each inspection, re- test pieces have been subjected and assess the flex- ported in accordance with clause 6; ing damage in accordance with clause 6. e) details of any deviations from the standard test NOTE 4 It is possible to remove the test pieces for ex- procedure. amination from the apparatus whilst still ~etained by the clips. This permits the test pieces to be re-inserted in the 5 Method C — Crumple/flex method apparatus and flexing continued if so required, without in- terfering with the folded configuration of the test pieces caused by flexing. 5.1 Principle A rectangular test piece of coated fabric is sewn into a cylindrical shape. The cylinder of coated fabric is 4.7 Test report mounted between two discs and secured into pos- ition. One of the discs oscillates on its axis through The test report shall include the following particulars: approximately 90”. This induces twisting in the coated-fabric test piece cylinder. At the same time, a) a reference to this method of test, i.e. Method B the other disc reciprocates along its axis, thus causing of ISO 7854:1 995; the cylindrical test piece to compress along its length. This twisting and simultaneous compressing of the b) all details necessay for the identification of th e cylindrical test piece is continued for either a pre-set coated fabric, including any relevant reference number of cycles or until damage to the test piece is number; apparent. 4 IS 7016 (Part 4) :2003 ISO 7854:1995 5.2 Apparatus 5.5 Procedure The apparatus consists essentially of two opposing Check that the apparatus is functioning at the required flanged or shouldered discs, with (180 ‘~) mm speed before proceeding with the test. between the inside faces of the flanges at maximum disc separation. The unflanged part of each disc is Mount the cylindrical test piece between the discs so 63,5 mm in ,diameter x 15,0 mm face width. The that each end of the test piece butts up to the inside discs are mounted along the same axis with their face of the shoulder on the disc. edges 152,4 mm apart at their maximum separation NOTE 5 This ensures that there is approximately 10 mm (see figure 3). One disc shall be capable of moving of slack in the test piece when mounted. towards the other along their common axis for a dis- tance of 70,0 mm, thus inducing compression into the Ensure when mounting the test piece that the oscil- cylindrical test piece at the rate of 2,53 Hz + lating disc is set at the mid-point of its oscillato~ 0,07 Hz, i.e. (152 + 4) compression strokes per min- cycle, i.e. at zero torque, and that the sewn seam (see ute. The second disc shall be capable of turning 5.3) is in line with the mid-point of the oscillating disc through an angle of 90° + 2°, thus inserting twist into (i.e. uppermost on a horizontal machine). the cylindrical test piece at a frequency of 3,33 Hz t 0,17 Hz, i.e. (200 A 10) twist insertions NOTES per minute. 6 The alignment of the sewn seam with the mid-point of Counters record the total number of compression the oscillating disc on a horizontally oriented machine is to strokes inserted during a test and the frequency at reduce the effect of test piece sag when mounted, which which the machine is operating. can influence the effectiveness of the test. 7 The speed of the machine may require adjusting during 5.3 Preparation of test pieces the test to offset the reduced damping effect of the test piece as the test proceeds. Heavier or thicker-coated fabrics 5.3.1 General will tend to have agreater damping effect at the start of the test and may therefore require greater adjustment as the Select two test pieces each 220 mm long x 190 mm damping effect is reduced during the test due to folding and wide from the usable width of the roll as defined in heating up of the test piece. ISO 2286. One test piece shall be selected with its longer dimension in the longitudinal direction of the Set the apparatus in motion and stop it after the roll of coated fabric and one test piece with the longer specified number of cycles or, if the point of failure dimension in the transverse directi o n of the roll of or breakdown of the coated fabric is to be deter- coated fabric. Each test piece shall b e sewn into a mined, stop the apparatus at predetermined intervals cylindrical shape 190 mm long x 64 mm inside diam- to allow examination of the test piece. eter with the coating face to be evaluated outermost, as illustrated in figure 4. 5.6 Examination of test pieces 5.3.2 Test pieces for subsequent hydrostatic-head testing Examine the test pieces initially whilst retained in the apparatus. Move the discs to the closed position and When subsequent hydrostatic-head tests are to be examine the test pieces for signs of cracking or de- conducted in accordance with ISO 1420, test pieces terioration. for hydrostatic-head testing shall be taken from the crumple/flex test piece in accordance with figure 5. Terminate flexing either at the specified number of cycles or at the first inspection at which test pieces 5.4 Conditioning and testing atmosphere show signs of deterioration or cracking of the type under investigation. Where relevant, record at each Condition the test pieces in atmosphere A, B or C of examination the total number of flexes to which the ISO 2231:1989, and conduct the test in that atmos- test pieces have been subjected and assess the fiex- phere. ing damage in accordance with clause 6.

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