1、BRITISH STANDARD BS7141-5: 1990 Narrow fabrics Part 5: Specification for elastic flat braids containing natural rubber UDC 677.074.3:677.554:620.113:006.3/.8BS7141-5:1990 This British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy Committee, was publi
2、shed underthe authority of the BoardofBSI and comes into effect on 28February1990 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference TCM/7 Draft for comment87/42607 DC ISBN 0 580 17879 X Committees responsible for this British Standard The preparation o
3、f this British Standard was entrusted by the Textiles and Clothing Standards Policy Committee (TCM/-) to Technical Committee TCM/7, upon which the following bodies were represented: British Narrow Fabrics Association British Polyolefin Textiles Association Consumer Policy Committee of BSI Home Laund
4、ering Consultative Council Man-made Fibres Producers Committee Ministry of Defence SATRA Footwear Technology Centre Society of Dyers and Colourists Textile Institute Amendments issued since publication Amd. No. Date of issue CommentsBS7141-5:1990 BSI 11-1999 i Contents Page Committees responsible In
5、side front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Construction 2 5 Performance 2 6 Sampling 2 7 Marking 2 Appendix A Cross-references 3 Appendix B Supplementary information for MoD contracts 3 Appendix C Method for counting the number of threads in the braid 3 Table 1 Constructi
6、on and performance of elastic flat braids 2 Table 2 Cross-references 3 Publications referred to Inside back coverBS7141-5:1990 ii BSI 11-1999 Foreword This Part of BS7141 has been prepared under the direction of the Textiles and Clothing Standards Policy Committee and supersedes BS1850:1970 which is
7、 withdrawn. The principal change from BS1850:1970 is that the range of fabrics specified has been revised. The specifications are based mainly on construction since, at the present levels of test technology and information, it is not yet possible to specify elastic braids in objective, performance-b
8、ased terms. Cross-references are given in Appendix A, and information specifically requested by the Ministry of Defence, which was previously contained in Defence Standards is given in Appendix B. Other Parts of this British Standard in preparation are: Part 1: Specification for polyamide and polyol
9、efin woven tapes and webbings; Part 2: Specification for cotton webbings for personal load carrying purposes; Part 3: Specification for wool tapes; Part 4: Specification for woven elastic webbings containing natural rubber; Part 6: Specification for laces for boots, shoes and other purposes. A Briti
10、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. In particular attention is drawn to the Textile
11、Products (Indications of FibreContent) Regulations S.I.1986 No.26. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpora
12、ted. This will be indicated in the amendment table on the inside front cover.BS7141-5:1990 BSI 11-1999 1 1 Scope This Part of BS7141 specifies requirements for elastic flat braids containing natural rubber. NOTEThe titles of the publications referred to in this standard are listed on the inside back
13、 cover. 2 Definitions For the purposes of this Part of BS7141 the following definitions apply. 2.1 braid a type of narrow fabric produced by interlacing three or more threads in such a way that they cross one another in diagonal formation 2.2 mass per unit area (narrow fabric) a characteristic of a
14、narrow fabric which may be calculated according to the following formula: Mass per unit area (in g/m 2 )= 2.3 modulus the force required to extend an elastic narrow fabric by a given extension 2.4 narrow fabric any fabric made by interlacing fibres or yarns which (in the UK) does not exceed450mm in
15、width. In the USA and for the purpose of the Combined Nomenclature of the European Community for tariff purposes the upper width limit is300mm. A characteristic of a narrow fabric is that its edges are an essential feature 2.5 rubber count the number of threads of a round (cross section) rubber thre
16、ad which, when placed side by side, measure25.4mm, e.g.a round rubber thread of0.6mm diameter is termed round count40 NOTEIn practice, the count is often expressed as40/46 meaning a round count of40, the Figure46 being the count of square (cross section) rubber thread of equivalent cross-sectional a
17、rea. In this standard the rubber threads used are all round in cross section and the counts quoted are the round rubber counts. 2.6 runback describes the phenomenon in an elastic fabric in which, when cut, the elastic threads retract from the cut end, into the body of the material 2.7 stretch the ex
18、tension under a given force of an elastic fabric expressed as a percentage of the original dimension of the fabric 3 Materials 3.1 Rubber thread Rubber thread shall be made from vulcanized natural rubber, and shall have a maximum relative density of1.05. Its round count shall be not less than40 nor
19、greater than30 when measured in accordance with BS5421. The minimum elongation of the rubber shall be at least30% greater than the stretch of the braid into which it is to be incorporated (seeBS4952). Mass (in g per 100 m) 10 Width (in mm) -BS7141-5:1990 2 BSI 11-1999 3.2 Textile braiding yarn The t
20、extile braiding yarn shall be made from one of the following fibres: a) cotton; b) continuous filament viscose; c) continuous filament polyamide; d) continuous filament polyester; e) continuous filament polypropylene. 4 Construction 4.1 The constructions for each braid shall be as given in Table 1.
21、4.2 The maximum width of braid shall be25.5mm. 5 Performance The performance of the braid shall be as given in Table 1. Table 1 Construction and performance of elastic flat braids 6 Sampling Samples shall not be taken from the first three metres of braid manufactured. Sampling shall be as follows. T
22、he number of samples (S) taken from each machine shall be as given by: S =0.25N A minimum of one sample shall be taken from each machine. In the event of dispute samples shall be preconditioned for4h at a relative humidity not exceeding10%r.h., at a temperature not greater than50 C and subsequently
23、exposed to the standard temperate atmosphere for testing textiles as defined in BS1051 for not less than24h and tested without removal from that atmosphere. 7 Marking The braids shall be provided with a ticket or other means of marking attached to each container carrying the following information: a
24、) the number and date of this Part of BS7141 1) , i.e.BS7141-5:1990; b) the reference number of the product in accordance with Table 1; c) the name, trademark or other means of identification of the manufacturer. NOTEFor MoD contracts additional information will be required, e.g.the contract number,
25、 the pattern number, the item name and description (seealso Appendix B). Reference number Minimum number rubber threads per millimetre width (measured in accordance with Appendix C) Minimum number textile braiding threads per millimetre width (measured in accordance with Appendix C) Minimum mass per
26、 unit area rubber (measured in accordance withBS2471) Minimum total mass per unit area (measured in accordance with BS2471) Minimum stretch (measured in accordance with BS4952 method6) 1 2 3 1.0 1.0 1.0 2.0 2.0 2.0 g/m 2 150 150 300 g/m 2 480 480 480 % 125 150 150 where S is the number of samples (t
27、o the nearest integer); N is the number of250m lengths from a machine. 1) Marking BS7141-5:1990 on or in relation to a product represents a manufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy o
28、f the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS7141-5:1990 BSI 11-1999 3 Appendix A Cross-references Cross-references between the reference numbers
29、 specified in this Part of BS7141 and reference numbers in BS1850:1970 are given in Table 2, which also gives qualitative characteristics of the fabrics. Table 2 Cross-references Appendix B Supplementary information for MoD contracts B.1 Standard patterns A standard pattern obtainable from the autho
30、rity named in the tender or contract provides criteria for any properties not specified in this standard. B.2 Non-compliance In the event of non-compliance with the specified requirements, any resampling is at the discretion of the Quality Assurance Directorate of the MoD. B.3 Delivery format Rolls
31、should be rolled straight and free from creases. The rolls should be approximately33m in length when measured in accordance with BS1931 after not less than24h relaxation. Rolls of not more than2lengths may be accepted provided that the shorter length is not less than11m. Appendix C Method for counti
32、ng the number of threads in the braid Determine the number of ends in the braid by dissecting a short length of the braid and counting the threads. Record separately the number of braiding ends. Reference number Previous reference numbers from BS1850 Stretch Modulus 1 2 3 1.1, 1.2, 1.3, 1.4, 2.1, 2.
33、2 1.5, 1.6 3.1, 3.2, 3.3 Medium High High Medium Medium High4 blankBS7141-5:1990 BSI 11-1999 Publications referred to BS1051, Glossary of terms relating to the conditioning, testing and mass determination of textiles. BS1931, Method for the determination of length of woven or knitted fabrics when re
34、laxed at zero tension. BS2471, Method of test for textileswoven fabricsdetermination of mass per unit length and mass per unit area. BS4952, Methods of test for elastic fabrics. BS5421, Methods of test for elastomeric threads. BS7141, Narrow fabrics. BS7141-1, Specification for polyamide and polyole
35、fin woven tapes and webbings 2) . BS7141-2, Specification for cotton webbings for personal load carrying purposes 2) . BS7141-3, Specification for wool tapes 2) . BS7141-4, Specification for woven elastic webbings containing natural rubber. BS7141-6, Specification for laces for boots, shoes and othe
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