1、BRITISH STANDARD BS7141-4: 1990 Narrow fabrics Part 4: Specification for woven elastic webbings containing natural rubber UDC 677.074.3:677.071.73:677.017.4:678.4:620.1:006.3/.8BS7141-4:1990 This British Standard, having been prepared under the directionof the Textiles and Clothing Standards Policy
2、Committee, was published underthe authority of the Board ofBSI and comes into effect on 30 April 1990 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference TCM/7 Draft for comment87/42606 DC ISBN 0 580 18149 9 Committees responsible for this British Standa
3、rd The preparation of 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 Committ
4、ee of BSI Home Laundering 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 CommentsBS7141-4:1990 BSI 08-1999 i Contents Page Commi
5、ttees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Construction 2 5 Other requirements 2 6 Sampling 3 7 Marking 3 Appendix A Cross-references 4 Appendix B Supplementary information for MoD contracts 4 Appendix C Additional recommendations 5 Appendix D Determin
6、ation of the mass per unit area of rubber thread in woven elastic narrow fabrics 5 Figure 1 Needleloom selvedge systems 6 Figure 2 Shuttleless construction with spool type interlocking 8 Table 1 Requirements for woven elastic webbing 2 Table 2 Cross-references 4 Table 3 MoD pattern numbers 4 Table 4
7、 Recommended performance tests 5 Publications referred to Inside back coverBS7141-4:1990 ii BSI 08-1999 Foreword This Part of BS7141 has been prepared under the direction of the Textiles and Clothing Standards Policy Committee. It supersedes BS1897:1971 and BS4270:1974 which are withdrawn, and also
8、incorporates additional fabrics, principally for use in the public sector. Cross-references are given in Appendix A. Information specifically requested by the Ministry of Defence and which was previously contained in Defence Standards is given in Appendix B. Appendix C gives additional recommendatio
9、ns, these being product properties which are desirable but which with present technology cannot be specified. Other Parts of this British Standard are as follows: Part 1: Specification for polyamide and polyolefin woven tapes and webbings 1) ; Part 2: Specification for cotton webbings for personal l
10、oad carrying purposes 1) ; Part 3: Specification for wool tapes; Part 5: Specification for elastic flat braids containing natural rubber; Part 6: Specification for laces for boots, shoes and other purposes. Product certification. Users of this British Standard are advised to consider the desirabilit
11、y of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification sche
12、mes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of Association members. A British Standard does not purport to include all the necessary provisio
13、ns 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 Products (Indications of Fibre Content) Regulations S.I.1986 No.2
14、6. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1to8, an inside back cover and a 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
15、front cover. 1) In preparation.BS7141-4:1990 BSI 08-1999 1 1 Scope This Part of BS7141 specifies requirements for woven elastic webbings containing natural rubber for use in the public sector and for general use. NOTEThe titles of the publications referred to in this standard are listed on the insid
16、e back cover. 2 Definitions For the purposes of this Part of BS7141 the following definitions apply. 2.1 mass per unit area (narrow fabric) a characteristic of a narrow fabric which may be calculated according to the following formula: 2.2 modulus the force required to extend an elastic narrow fabri
17、c by a given extension 2.3 narrow fabric any fabric made by interlacing fibres or yarns which (in the UK) does not exceed450mm in width. In the USA and for the purpose of the Combined Nomenclature of the European Community for tariff purposes, the upper limit of width is300mm. A characteristic of a
18、narrow fabric is that its edges are an essential feature 2.4 needleloom a shuttleless loom in which the weft is drawn from a stationary supply and introduced into the shed in the form of a double-pick by a weft insertion needle. The weft is retained at the opposite selvedge by the action of knitting
19、, or by the introduction of a locking thread from a separate supply 2.5 needleloom selvedge (NL selvedge) the selvedge opposite to that from which the weft is inserted in a narrow fabric needleloom NOTE 1Usually, this selvedge is formed by knitting together successive double-pick weft loops, sometim
20、es in combination with, or exclusively by means of, a locking thread from a stationary supply. Alternatively, the locking thread may be supplied from a small spool arranged to be passed through the extremities of the weft loops. NOTE 2Needleloom selvedge systems are illustrated in Figure 1. 2.6 rubb
21、er count the number of threads of a round (cross section) rubber thread which, when placed side by side, measure25.4mm, e.g.a round rubber thread of0.6mm diameter is termed round count40. In practice, the count is often expressed as40/46 meaning a round count of40, the Figure46 being the count of sq
22、uare (cross section) rubber thread of equivalent cross sectional area. In this standard the rubber threads used are all round in cross section and the counts quoted are the round rubber counts 2.7 runback the phenomenon in an elastic fabric in which, when cut, the elastic threads retract from the cu
23、t end into the body of the web 2.8 selvedge when used without qualification, a longitudinal edge of a fabric formed during weaving, with the weft not only turning at the edges but also passing continuously across the width of the fabric from edge to edge 2.9 shuttleloom a weaving machine that uses a
24、 shuttle to insert the weft 2.10 stretch the extension under a given force of an elastic fabric expressed as a percentage of the original dimension of the fabric 2.11 weave the pattern of interlacing of warp and weft in a woven fabric 2.12 webbing a woven narrow fabric, the prime function of which i
25、s load bearing NOTEWebbing is generally of a coarse weave and often has multiple plies. 3 Materials 3.1 Covered rubber thread 3.1.1 Rubber thread. Rubber thread shall be made from vulcanized natural rubber and shall have a maximum relative density of1.05. Its cross section shall be not less than tha
26、t of60 round count when measured by BS5421.BS7141-4:1990 2 BSI 08-1999 3.1.2 Textile covering yarn. The rubber core shall be covered with four ends of yarn arranged in two spirally opposed layers. Each end of covering shall be not less than25 tex and shall be made of any fibre or blend having a mois
27、ture regain not less than8.5%. 3.1.3 Elongation. The minimum elongation of a covered rubber thread shall be160% under a load of225g and shall be at least30% greater than the ultimate stretch of the webbing in which it is to be incorporated (see BS4952). 3.2 Non-elastic yarns The composition and line
28、ar density of the non-elastic warp yarns and weft yarns shall be such that the average moisture regain of the fibres comprising the surface of the webbing is not less than8.5%. 4 Construction 4.1 The weave of the webbing shall be double fabric with rigid binder yarns and rubber thread interwoven in
29、both fabrics. Weaving shall be carried out by shuttleloom or needleloom. 4.2 In any250mm of finished webbing, each covered rubber thread shall have a minimum of160mm of rubber core. 4.3 In the case of fabrics produced on a needleloom, the needleloom selvedge shall be made secure using one of the sys
30、tems shown in Figure 1. NOTEThe needleloom selvedge should be adequately secure for the end use intended. This means that the structure of the needleloom selvedge should give adequate protection against unravelling (see Figure 1 in which security increases from system A to system D) and that the cat
31、ch and lock threads should be adequately strong. (See Figure 2 for a recommended spool type interlocking system.) 5 Other requirements 5.1 Fabrics shall comply with the appropriate requirements of Table 1. 5.2 Woven elastic webbing used in mens trunk tops shall comply with the following. a) The loss
32、 of modulus, measured at50% extension, shall not exceed10% when tested in accordance with method7A of clause7 of BS4952:1973 at120 C for4h. b) The length shrinkage as measured by the method in BS5807 shall not exceed8% when tested using wash procedure number1A of BS4923 followed by line drying. c) T
33、he colour fastness shall be a minimum of grade4 both for change in colour and staining when tested in accordance with test C2S of BS1006:C06. Table 1 Requirements for woven elastic webbing Reference number Minimum mass per unit area (measured in accordance with BS2471) Minimum mass per unit area of
34、rubber thread (measured in accordance with Appendix D) Minimum Stretch (measured in accordance with BS4952) Width a 1 g/m 21200 g/m 2350 % 60 mm 19 2 650 190 100 45 3 650 100 100 35 4 650 150 75 25.5 5 650 70 50 25.5 a Subject to a tolerance of 1.5mm.BS7141-4:1990 BSI 08-1999 3 6 Sampling Samples sh
35、all not be taken from the first3m of textile manufactured. Sampling shall be as follows. a) Woven fabrics, loomstate. i) For fabrics woven from beams, take one sample from one piece per beam. NOTEThe quantity of fabric produced from one weavers beam or from a creel contains the same warp yarns throu
36、ghout and is woven in one particular form. As such, it constitutes a unique batch or unit of production, provided that weft yarn of substantially consistent quality has been used. If a fresh delivery of weft yarn of unproved quality is introduced during weaving the warp, a fresh batch has been creat
37、ed and further samples for complete fabric tests become necessary. Manufacturers should maintain continuous quality control of weft yarn in respect of the relevant properties, e.g.type of fibre, linear density, strength. ii) For fabrics woven from creels, take one sample from one piece from each con
38、tinuously woven length not exceeding5000m. iii) If several narrow fabrics are woven simultaneously in the same loom, take one sample from each continuously woven length not exceeding5000m. b) Woven fabrics, piece treated. i) For woven fabrics already proved by test in loomstate, take one sample from
39、 one piece per finishers batch per fabric type and manufacturer. ii) For woven fabrics not subject to test in loomstate, take one sample from one piece per weavers beam or each continuously woven length not exceeding5000m per finishers batch. iii) If a finishers batch consists of further pieces from
40、 a weavers beams, or from continuously woven lengths previously proved by test in the finished condition, take one sample from one piece from the finishers batch. In the event of dispute, samples shall be pre-conditioned for4h at a relative humidity not exceeding10% and at a temperature not greater
41、than50 C and subsequently exposed to the standard temperate atmosphere for testing textiles as defined in BS1051 for not less than24h, and then tested without removal from that atmosphere. 7 Marking The webbings shall be provided with a ticket or other means of marking attached to each container and
42、 carrying the following information: a) the number and date of this Part of BS7141, i.e.BS7141-4:1990 2) ; 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 (see Appendix B), the infor
43、mation will also include the contract number, the NATO stock number (where appropriate, see Table 3), the pattern number (seeTable 3) and the item name and description (see Table 3). 2) Marking BS7141-4:1990 on or in relation to a product represents a manufacturers declaration of conformity, i.e.a c
44、laim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of 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
45、desirable.BS7141-4:1990 4 BSI 08-1999 Appendix A Cross-references Cross-references between the reference numbers specified in this Part of BS7141, reference numbers in previous standards and previous pattern numbers are given in Table 2 and Table 3. Table 2 Cross-references Table 3 MoD pattern numbe
46、rs Appendix B Supplementary information for MoD contracts B.1 Standard patterns A standard pattern obtainable from the authority 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 r
47、equirements, any resampling is at the discretion of the Quality Assurance Directorate. B.3 Delivery format Rolls 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 mor
48、e than two lengths may be accepted provided that the shorter length is not less than11m. B.4 Customer approval Unless system D is used, samples and thread diagrams of selvedges will be approved by the customers representative before production commences. Reference number Previous references of produ
49、cts included Characteristics Mass per unit area Modulus Stretch 1 BS1897 C BS1897 E Heavy High Low 2 BS1897 A BS4270 (and commercial qualities accepted by the public sector) Medium High High 3 (Commercial quality accepted by the public sector) Medium Low High 4 BS1897 D (and commercial qualities accepted by the public sector) Medium High Low 5 BS1897 B (and commercial qualities accepted by the public sector) Medium Low Low Pattern number Previous pattern number Width Reference number 9486 9487 9488 9489 9490 NF503 NF504 NF509B NF517
