1、BRITISH STANDARD AEROSPACE SERIES BS 2F 134:2002 (Superseding BS F 134:1989) Continuous filament polyester sewing thread suitable for aerospace purposes ICS 49.025.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 2F 134:2002 This British Standard, having been prepared unde
2、r the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Sector Policy and Strategy Committee on 11 July 2002 BSI 11 July 2002 BS F 134: November 1989 The following BSI references relate to work on this British Standard: Committee reference AC
3、E/22 Draft for comment 00/707928 DC ISBN 0 580 39826 9 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 which the following bodies were represented: Line
4、n Sewing Thread Manufacturers Association Ministry of Defence UK Defence Standardization Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No. Date CommentsBS 2F 134:2002 BSI 11 July 2002 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o
5、p e 1 2 General requirements 1 3Y a r n 2 4 Construction and properties 2 5 Finish 2 6T y p e t e s t s 4 7 Identification 4 Annex A Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg) 5 Annex B Method of test for sewing properties (threads of length per u
6、nit mass less than 9 000 m/kg) 6 Publications referred to Inside back cover Figure A.1 Test piece for threads of length per unit mass not less than 9 000 m/kg 5 Figure B.1 Test piece for threads of length per unit mass less than 9 000 m/kg 7 Table 1 General requirements (given in BS F 100) 1 Table 2
7、 Construction and properties 3BS 2F 134:2002 ii BSI 11 July 2002 Foreword This British Standard, which has been prepared under the direction of Technical Committee ACE/22, Cords, ropes and sewing threads for aerospace purposes, is one of a series of standards for textiles of a quality suitable for a
8、erospace purposes. This British Standard supersedes BS F 134:1989 which is withdrawn.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 due course. This standard includes polyester sewing threads previously
9、defined in Ministry of Defence Specification UK/AID/971 which is withdrawn. The previous edition of this standard differed from UK/AID/971 Issue 1 in that alternative thread constructions were permitted, and additional thread constructions were included. The applicable basic quality requirements spe
10、cified in BS F 100 were identified. This new edition incorporates all earlier amendments, updates references to other standards, revises the reference to BS F 100 and improves nomenclature in line with other standards. The quality assurance authority referred to in this standard is as stated in the
11、contract or order, or the accredited representative of the authority stated as instructed by the prime contractors. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not
12、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 indicates when the document was last issued.BS 2F
13、134:2002 BSI 11 July 2002 1 1 Scope This British Standard specifies requirements for a range of continuous filament polyester sewing threads for aerospace purposes. NOTE 1 The titles of the publications referred to in this standard are listed on the inside back cover. NOTE 2 The latest revision of a
14、n Aerospace Series standard is indicated by a prefix number. 2 General requirements 2.1 In addition to the requirements specified in clauses 3, 4, 5, 6 and 7 of this standard, the requirements and tests of the latest edition of BS F 100 as specified in Table 1 shall apply. Table 1 General requiremen
15、ts (given in BS F 100) 2.2 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 faults. Threads of length per unit
16、 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 with BS EN ISO 2060:1995, option
17、1. 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 for dyed textiles except those related to fabric intended for coating. Requirements for freedom from corrosive impurities
18、 (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 extract; test for pH value of aqueous extract; test for water soluble chloride; test for water soluble sulfate. a It is no
19、t 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 manufacturer.BS 2F 134:2002 2 BSI 11 July 2002 3 Yarn The threads shall be manufactured from bright continuous filament polye
20、thylene terephthalate yarn. 4 Construction and properties 4.1 Threads shall conform to the requirements of Table 2, except that the twist directions may be reversed from those specified. NOTE It should be stated in the contract or order if the twist direction is to be other than as specified in Tabl
21、e 2. 4.2 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 tolerance on twist shall not vary from the level selected by more than the following: a) selected value of twist up to and i
22、ncluding 400 turns per metre (tpm): 40 tpm; b) selected value of twist greater than 400 turns per metre (tpm): 10 %. 5 Finish 5.1 Condition of material The thread shall be supplied in one of the following conditions: a) undyed; b) undyed and bonded; c) dyed; d) dyed and bonded. NOTE The condition re
23、quired should be stated in the contract or order. 5.2 Dyeing Where dying is required, the colour shall be specified either by reference to a British Standard, e.g. BS 381C, or otherwise by pattern. 5.3 Finish Finishes and bonding agents shall not contain substances known to promote microbiological g
24、rowth. The added mass due to the dye and/or finish shall not exceed a total of 14 % of the original mass. NOTE A lubricating finish may be applied to the thread to facilitate its performance.BS 2F 134:2002 BSI 11 July 2002 3 Table 2 Construction and properties Designation Structure Minimum length pe
25、r unit mass a Minimum avearge breakage strength Unbonded Bonded Nominal dtex/turns per metre (tpm) m/kg N TT1 TT1B 74 dtex S880 1 160 3Z 540-770 37 000 10 TT2 TT2B 138 dtex S650 870 3Z 380-500 19 750 20 TT3 TT3B 280 dtex S450 610 2Z 380-490 14 910 30 TT4 TT4B 280 dtex S500 610 3Z 315-410 10 000 45 T
26、T5 TT5B 280 dtex Spinning 2S 380 545 3Z 250-350 4 750 85 or 550 dtex S380 545 3Z 250-350 TT6 TT6B 280 dtex Spinning 3S 324 545 3Z 200-285 3 135 135 or 830 dtex S324 545 3Z 200-285 TT7 TT7B 280 dtex Spinning 4S 235 325 3Z 160-265 2 325 180 or 550 dtex Spinning 2S 235 325 3Z 160-265 or 1 100 dtex S235
27、 325 3Z 160-265 TT12 TT12B 138 dtex S720 870 2Z 580-660 29 600 15 TT13 TT13B 220 dtex S305 690 3Z 275-470 12 350 36 TT14 TT14B 455 dtex S380 590 3Z 270-414 5 750 70 TT15 TT15B 220 dtex Spinning 3S 350-500 3Z 230-330 3 950 102 or 660 dtex S350 500 3Z 230-330 TT16 TT16B 940 dtex S235 450 3Z 160-270 2
28、770 153 NOTE The finished twist direction may be reversed from those specified (in which case the primary twist direction is also reversed) and should be stated in the contract or order (see 4.1). a The values stated exclude the mass of added dye and/or finish. BS 2F 134:2002 4 BSI 11 July 2002 6 Ty
29、pe tests 6.1 General 6.1.1 The type tests specified in 6.2, 6.3 and 6.4 shall be carried out to the satisfaction of the quality assurance authority. 6.1.2 After initial satisfaction of type tests, no changes in respect of either the materials or processing conditions used shall be made without the t
30、ype tests being repeated to the satisfaction of the quality assurance authority. 6.1.3 The manufacturers records of type approval tests shall be made available to the quality assurance authority on request. 6.2 Extension under force (type test) The extension of the threads, when subjected to a force
31、 equal to 25 % of the specified breaking strength as defined in Table 2 for (60 5) s, shall not exceed 14 %. 6.3 Dimensional stability on heating in boiling water (type test) When determined in accordance with the latest edition of BS F 100, the mean shrinkage of the threads in boiling water shall n
32、ot exceed 3.5 %. 6.4 Sewing properties (type test) 6.4.1 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 there shall not be more than two malformed stitche
33、s. 6.4.2 Threads other than those specified in 6.4.1 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. 7 Identification The thread shall be identified, for ordering purpos
34、es, by the number of this British Standard, i.e. BS 2F 134 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 TT5, required bonded and dyed NATO green, may be identified as BS 2F 134/TT5B/BS 38
35、1C No. 285. 1) Marking BS 2F 134 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 solely the claimants responsibility. Such a dec
36、laration is not to be confused with third party certification of conformity, which may also be desirable.BS 2F 134:2002 BSI 11 July 2002 5 Annex A Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg) A.1 Apparatus The apparatus required is a twin-needle loc
37、k 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-width lengths, each approximately 1 m long, of ny
38、lon 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 to enable the test piece to be turned. Ignore a
39、ny 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 approx. Start Finish Twin stitchingBS 2F 134:
40、2002 6 BSI 11 July 2002 Annex B Method of test for sewing properties (threads of length per unit mass less than 90 00m /kg ) B.1 Apparatus The apparatus required is a single-needle lock stitch sewing machine, capable of a stitching rate of (250 40) stitches/min at a pitch of 5 stitches per 25 mm, pr
41、operly 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 F 124/244); b) dyed nylon webbing to BS F 124 fabric 161 (
42、BS F 124/161) polyurethane treated; c) dyed polyester webbing to BS F 129 fabric 215 (BS F 129/215); d) dyed polyester webbing to BS F 129 fabric 655/1 (BS F 129/655/1). B.2.2 Each test piece consists of the following number of thicknesses of webbing, approximately 45 mm wide and 0.5 m long: a) for
43、threads TT5, TT14 and TT15: two thicknesses; b) for threads TT6, TT7 and TT16: 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 pieces for slipped, broken or mal
44、formed stitches.BS 2F 134:2002 BSI 11 July 2002 7 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 125 125 125 500 approx. Stitching8 blankBS
45、 2F 134:2002 BSI 11 July 2002 Publications referred to BS 6F 100, Procedure for inspection and testing of textiles for aerospace purposes. BS 3F 118, Specification for 50 g/m 2nylon parachute fabric. BS 2F 124, Specification for woven nylon narrow fabrics for aerospace purposes (nominally 940 dtex y
46、arns). BS F 129, Specification for woven polyester narrow fabrics suitable for aerospace purposes. BS 381C, Specification for colours for identification, coding and special purposes. BS 2648, Performance requirements for electrically-heated laboratory drying ovens. BS EN ISO 2060:1995, Textiles Yarn
47、 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. UK/AID/971, Issue 1 (August 1978) Polyester Sewing Threads for
48、Aeronautical Quality Assurance Directorate. 2) 2) Referred to in the Foreword only.BS 2F 134:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europ
49、e and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity whil
