1、BRITISH STANDARD AEROSPACE SERIES BS 5F 120:2002 (Superseding BS 4F 120:1993) Continuous filament nylon sewing threads for aerospace purposes ICS 49.025.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 5F 120:2002 This British Standard, having been prepared under the direc
2、tion of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Sector Policy and Strategy Committee 11 July 2002 BSI 11 July 2002 BS F 120: 1964 BS 2F 120: June 1975 BS 3F 120: December 1987 BS 4F 120: October 1993 The following BSI references relate to work o
3、n this British Standard: Committee reference ACE/22 Draft for comment 00/707927 DC ISBN 0 580 39825 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/22, Cords, ropes and sewing threads for aerospace purposes, upon wh
4、ich the following bodies were represented: Linen Sewing Thread Manufacturers Association Ministry of Defence UK Defence Standardization Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBS 5F 120:2002 BSI 11 July 2002 i Contents Page Committees res
5、ponsible Inside front cover Foreword ii 1S c o p e 1 2 References 1 3 General requirements 1 4Y a r n 1 5 Construction and properties 2 6 Finish 2 7T y p e t e s t s 4 8 Identification 5 Annex A Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg) 6 Annex B
6、 Method of test for sewing properties (threads of length per unit mass less than 9 000 m/kg) 7 List of references Inside back cover Figure A.1 Test piece for threads of length per unit mass not less than 9 000 m/kg 6 Figure B.1 Test piece for threads of length per unit mass less than 9 000 m/kg 8 Ta
7、ble 1 General requirements (given in BS F 100) 1 Table 2 Construction and properties 3 Table 3 Loop breaking load 4BS 5F 120:2002 ii BSI 11 July 2002 Foreword This British Standard, prepared under the direction of Technical Committee ACE/22, Cords, ropes and sewing threads for aerospace purposes, is
8、 one of a series of standards for textiles of a quality suitable for aerospace purposes. This British Standard supersedes BS 4F 120:1993 which is withdrawn. This new edition incorporates technical changes but it does not reflect a full review or revision of the standard, which will be undertaken in
9、due course. The primary difference between the fourth edition and the third edition of this British Standard was the introduction of three alternative constructions for 312, 950 and 1160 dtex yarns to allow the use of modern manufacturing methods to improve freedom from faults. This new edition inco
10、rporates all earlier amendments, updates references to other standards, revises the reference to BS F 100 and improves nomenclature in line with other standards. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application
11、. 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, pages 1 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indi
12、cates when the document was last issued.BS 5F 120:2002 BSI 11 July 2002 1 1 Scope This British Standard specifies requirements for a range of continuous filament nylon sewing threads for aerospace purposes. NOTE The latest revision of an Aerospace Series standard is indicated by a prefix number. 2 R
13、eferences 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to,
14、 or revisions of, any of these publications apply to this standard only when incorporated in it by updating or revision. 2.2 Informative reference This British Standard refers to another publication that provides information. The edition of this publication current at the time of issue of this stand
15、ard is listed on the inside back cover but references should be made to the latest edition. 3 General requirements 3.1 In addition to the requirements specified in clauses 4, 5, 6, 7 and 8 of this standard, the requirements and tests of the latest edition of BS F 100 as specified in Table 1 shall ap
16、ply. Table 1 General requirements (given in BS F 100) 3.2 Threads manufactured in accordance with this standard shall conform to the following. a) Freedom from faults. Threads shall have uniformity of thickness, construction and component ply tension so that there are no visually irregular twist fau
17、lts. Threads of length per unit mass less than 9 000 m/kg shall not contain thread knots. Threads of length per unit mass greater than 9 000 m/kg shall not contain more than two thread knots per package. b) Length per unit mass. The length per unit mass of thread shall be determined in accordance wi
18、th BS EN ISO 2060:1995, option 1. 4 Yarn The threads shall be manufactured from bright continuous filament nylon 6.6 yarn. Section of BS F 100 Section title Requirements and tests 1 General All requirements. 2 a Quality requirements Requirements for manufacture of sewing threads only. Requirements f
19、or dyed textiles except those related to fabric intended for coating. Requirements for freedom from corrosive impurities (see Section 4 of BS F 100). 3 Physical tests Tests for breaking strength and extension under force. 4 Chemical tests If required by Section 2: test for conductivity of aqueous ex
20、tract; test for pH value of aqueous extract; test for water soluble chloride; test for water soluble sulfate. a It is not intended that Section 2 tests should be performed on each thread batch. The frequency of these tests should be agreed between the Quality Assurance Authority and the thread manuf
21、acturer.BS 5F 120:2002 2 BSI 11 July 2002 5 Construction and properties 5.1 Threads shall conform to the requirements of Table 2. 5.2 Threads shall be supplied with twist levels selected from within the range given in Table 2. The twist shall be determined in accordance with BS EN ISO 2061:1996. The
22、 tolerance on twist shall not vary from the level selected by more than the following: a) selected value of twist up to and including 400 turns per metre (tpm): 40 tpm; b) selected value of twist greater than 400 turns per metre (tpm): 10 %. 6 Finish 6.1 Condition of material The thread shall be sup
23、plied in one of the following conditions: a) undyed; b) undyed and bonded; c) dyed; d) dyed and bonded. NOTE The condition required should be stated in the contract or order. 6.2 Dyeing Where dyeing is required, the colour shall be specified either by reference to a British Standard, e.g. BS 381C, o
24、r otherwise by pattern. 6.3 Finish Finishes and bonding agents shall not contain substances known to promote microbiological growth. 6.4 The added mass due to the dye and/or finish shall not exceed a total of 12 % of the original mass. NOTE A lubricating finish may be applied to the thread to facili
25、tate its performance.BS 5F 120:2002 BSI 11 July 2002 3 Table 2 Construction and properties Designation Structure Minimum length per unit mass a Minimum average breaking strength Unbonded Bonded Nominal dtex/turns per metre (tpm) m/kg N NT1 NT1B 78 dtex S 905-1 140 3 Z 570-730 36 300 13.5 NT2 NT2B 15
26、6 dtex S 315-845 3 Z 285-530 18 150 27 NT3 NT3B 235 dtex S 450-690 2 Z 380-530 18 150 27 NT4 NT4B 235 dtex S 305-690 3 Z 275-470 12 100 40 NT5 NT5B 235 dtex spinning 2 S 380-590 3 Z 270-415 80 or 6 050 470 dtex S 380-590 3 Z 270-415 NT6 NT6B 235 dtex spinning 3 S 315-435 3 Z 215-295 or 4 025 120 700
27、 dtex S 315-435 3 Z 215-295 NT7 NT7B 235 dtex spinning 4 S 295-375 3 Z 155-295 or 470 dtex spinning 2 S 295-375 3 Z 155-295 3 025 160 or 950 dtex S 295-375 3 Z 155-295 NT8 NT8B 235 dtex spinning 5 S 215-295 3 Z 120-195 or 2 425 200 1 160 dtex S 215-295 3 Z 120-195 NT9 NT9B 110 dtex S 445-965 3 Z 405
28、-570 24 200 20 NT10 NT10B 235 dtex S 295-500 4 Z 250-350 9 050 54 NT11 NT11B 940 dtex spinning 2 S 180-280 3 Z 105-200 or 1 400 335 470 dtex spinning 4 S 180-280 3 Z 105-200 NT12 NT12B 312 dtex S 430-600 3 Z 295-375 9 050 54 NOTE The finished twist direction may be reversed from that specified (in w
29、hich case the primary twist direction is also reversed) and should be stated in the contract or order. a The values stated exclude the mass of added dye and/or finish. BS 5F 120:2002 4 BSI 11 July 2002 7 Type tests 7.1 General 7.1.1 The type tests specified in 7.2, 7.3, 7.4 and 7.5 shall be carried
30、out to the satisfaction of the quality assurance authority. 7.1.2 After initial satisfaction of the type tests, no changes in respect of either the materials or processing conditions used are to be made without the type tests being repeated to the satisfaction of the quality assurance authority. 7.1
31、.3 The manufacturers records of type approval tests shall be made available to the quality assurance authority on request. 7.2 Loop breaking load (type test) Threads shall have a minimum average loop breaking load as given in Table 3 when tested in accordance with BS 1932-2:1989. Table 3 Loop breaki
32、ng load 7.3 Extension under force (type test) The extension of the threads, when subjected to a force equal to 25 % of the specified breaking strength as given in Table 2 for (60 5) s, shall not exceed 12 %. 7.4 Dimensional stability on heating in boiling water (type test) When determined in accorda
33、nce the latest edition of BS F 100, the mean shrinkage of the threads in boiling water shall not exceed 3.5 %. Designation Minimum average loop breaking load Unbonded Bonded N NT1 NT1B 16 NT2 NT2B 32 NT3 NT3B 32 NT4 NT4B 48 NT5 NT5B 96 NT6 NT6B 144 NT7 NT7B 192 NT8 NT8B 240 NT9 NT9B 24 NT10 NT10B 64
34、 NT11 NT11B 402 NT12 NT12B 64BS 5F 120:2002 BSI 11 July 2002 5 7.5 Sewing properties (type test) 7.5.1 Threads of minimum length per unit mass of not less than 9 000 m/kg shall be tested in accordance with Annex A. The stitching pattern shall be completed without slipped or broken stitches, and ther
35、e shall not be more than two malformed stitches. 7.5.2 Threads other than those specified in 7.5.1 shall be tested in accordance with Annex B. The stitching patterns shall be completed without slipped or broken stitches, and there shall not be more than two malformed stitches. 8 Identification The t
36、hread shall be identified, for ordering purposes, by the number of this British Standard, i.e. BS 5F 120 1) , together with the relevant designation given in Table 2 and, if required dyed, the colour. NOTE This identification may be codified. For example, thread NT5, required bonded and dyed NATO gr
37、een, may be identified as BS 5F 120/NT5B/BS 381C No. 285. 1) Marking BS 5F 120 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 of the claim is s
38、olely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS 5F 120:2002 6 BSI 11 July 2002 Annex A Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg) A.1 Apparat
39、us The apparatus required is a twin-needle lock stitch sewing machine, capable of a stitching rate of (3 250 250) stitches/min at a pitch of 8 stitches per 25 mm, properly adjusted for tension, 8 mm gauge, and fitted with an appropriate needle. A.2 Test piece The test piece consists of four full-wid
40、th lengths, each approximately 1 m long, of nylon fabric conforming to BS F 118 fabric 556 (F118/556), laid out in a stack. A.3 Procedure Stitch the test piece at the rate given in A.1, as shown in Figure A.1, lifting the foot and needle, but not cutting the thread, at the end of each straight run t
41、o enable the test piece to be turned. Ignore any slight looping at each corner. A.4 Examination Examine the test piece for slipped, broken or malformed stitches. All dimensions in millimetres Figure A.1 Test piece for threads of length per unit mass not less than 9 000 m/kg 12.5 12.5 12.5 12.5 1 000
42、 approx. Start Finish Twin stitchingBS 5F 120:2002 BSI 11 July 2002 7 Annex B Method of test for sewing properties (threads of length per unit mass less than 9 000 m/kg) B.1 Apparatus The apparatus required is a single-needle lock stitch sewing machine, capable of a stitching rate of (250 40) stitch
43、es/min at a pitch of 5 stitches per 25 mm, properly adjusted for tension and fitted with an appropriate needle. Application of lubricant to the needle is permitted. B.2 Test pieces B.2.1 Four test pieces are required using the following: a) dyed nylon webbing to BS F 124 fabric 244 (BS F124/244); b)
44、 dyed nylon webbing to BS F 124 fabric 161 (BS F124/161) polyurethane treated; c) dyed polyester webbing to BS F 129 fabric 215 (BS F129/215); d) dyed polyester webbing to BS F 129 fabric 655/1 (BS F129/655/1). B.2.2 Each test piece consists of the following number of thicknesses of webbing, approxi
45、mately 45 mm wide and 0.5 m long: a) for threads NT5 and NT6: two thicknesses; b) for threads NT7, NT8 and NT11: three thicknesses. B.3 Procedure Stitch together the webbings of each test piece with two four-point double Ws and a gate pattern, as shown in Figure B.1. B.4 Examination Examine the test
46、 pieces for slipped, broken or malformed stitches.BS 5F 120:2002 8 BSI 11 July 2002 All dimensions in millimetres NOTE S is the start of the sewing pattern. F is the finish of the sewing pattern. Figure B.1 Test piece for threads of length per unit mass less than 9 000 m/kg 33 = S S S F F F 125 125
47、125 500 approx. StitchingBS 5F 120:2002 BSI 11 July 2002 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 1932, Testing the strength of yarns and threads from packages. BS 1932-2:1989, Methods for determination of knot strengt
48、h and loop strength. BS EN ISO 2060:1995, Textiles Yarn from packages Determination of linear density (mass per unit length) by the skein method. BS EN ISO 2061:1996, Textiles Determination of twist in yarns Direct counting method. BS EN ISO 3696, Specification for water for laboratory use. BS 2648:
49、1955, Performance requirements for electrically-heated laboratory drying ovens. BS 6F 100, Procedure for inspection and testing of textiles for aerospace purposes. BS 4F 118, Specification for 50 g/m 2nylon parachute fabric. BS 3F 124, Specification for woven nylon 6.6 narrow fabrics for aerospace purposes (nominally 940 dtex yarns). BS 2F 129, Specification for woven polyester narrow fabrics for aer
