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1、BRITISH STANDARD BS 4F 120: 1993 Specification for Continuous filament nylon sewing threads for aerospace purposes UDC 629.7:677.072.6:677.494.675-486.2:677.027.21 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 This British S
2、tandard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1993 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ACE/22 Dr
3、aft for comment 92/78453 DC ISBN 0 580 22518 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/22, upon which the following bodies were represented: British Associat
4、ion of Clothing Machinery Manufacturers British Narrow Fabrics Association British Textile Confederation Cordage Manufacturers Institute Lambeg Industrial Research Association Linen Sewing Thread Manufacturers Association Ministry of Defence Society of British Aerospace Companies Ltd. Society of Dye
5、rs and Colourists Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 BSI 07-1999i Contents Page Committees responsible Inside front cover Foreword ii 1Scope1 2References1 3
6、General requirements1 4Yarn1 5Construction and properties1 6Finish1 7Type tests2 8Identification3 Annex A Method for determination of boiling water shrinkage of sewing thread4 Annex B Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg)5 Annex C Method of t
7、est for sewing properties (threads of length per unit mass less than 9 000 m/kg)6 Figure A.1 Thread loop and tensioning weight suspended on testing frame4 Figure B.1 Test piece for threads of length per unit mass not less than 9 000 m/kg5 Figure C.1 Test piece for threads of length per unit mass les
8、s than 9 000 m/kg6 Table 1 General requirements (given in BS F 100)1 Table 2 Construction and properties2 Table 3 Loop breaking load3 List of references Inside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 ii BSI
9、07-1999 Foreword This British Standard, prepared under the direction of the Aerospace Standards Policy Committee, is one of a series of standards for textiles of a quality suitable for aerospace purposes. This British Standard supersedes BS 3F 120:1987 which is withdrawn. This new edition incorporat
10、es technical changes but it does not reflect a full review or revision of the standard which will be undertaken in due course. The primary difference between this British Standard and the previous edition is the introduction of three alternative constructions for 312, 950 and 1160 dtex yarns to allo
11、w the use of modern manufacturing methods to improve freedom from faults. A British 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
12、immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, 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
13、 the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 BSI 07-19991 1 Scope This British Standard specifies requirements for a range of continuous filament nylon sewing threads for aero
14、space purposes. NOTEThe latest revision of an Aerospace Series standard is indicated by a prefix number. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the approp
15、riate points in the text and the publications are listed on this inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this standard only when incorporated in it by updating or revision. 2.1 Informative reference This British Standard refers to another publ
16、ication that provides information. The edition of this publication current at the time of issue of this standard 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 to 8 of this stan
17、dard, the requirements and tests of the latest edition of BS F 100 as listed in Table 1 shall apply. 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 defects. Threads shall be free from irregula
18、r twist. Threads of length per unit mass less than 9 000 m/kg shall not contain threads 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 accordan
19、ce with method A of BS 2010:1963. 4 Yarn The threads shall be manufactured from bright continuous filament nylon 6.6 yarn. 5 Construction and properties 5.1 Threads shall conform to Table 2. 5.2 Threads shall be supplied with twist levels selected from within the range given in Table 2. The twist sh
20、all be determined in accordance with BS 2085:1973. The tolerance on twist shall not vary from the level selected by more than the following: a) selected value 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 Finis
21、h 6.1 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. 6.2 Dyeing Where dyeing is required, the colour shall be specified either by reference to a British Standard, e.g. BS 381C, or otherwise by patte
22、rn. 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. NOTEA lubcricating finish may be applied to the thread to facilitate its performance
23、. SectionTitleRequirements and tests 1GeneralAll requirements 2aQuality requirements Requirements for dyed textiles except those relating to fabric intended for coating. Requirements for freedom from corrosive impurities (see section 4) 3Physical testTests for breaking strength and extension under f
24、orce 4Chemical test If required by section 2, further tests for freedom from corrosive impurities 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 manufacturer. Lic
25、ensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 2 BSI 07-1999 Table 2 Construction and properties 7 Type tests 7.1 General 7.1.1 The type tests specified in 7.2 to 7.5 shall be carried out to the satisfaction of the quality assur
26、ance 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. 7.1.3 The manufacturers records of type approva
27、l 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. 7.3 Extension under load (type test) The extension of the threa
28、ds, when subjected to a load equal to 25 % of the specified breaking strength as given in Table 2 for 60 5 s, shall not exceed 12 %. 7.4 Shrinkage in boiling water (type test) The mean shrinkage of the threads in boiling water, when determined in accordance with Annex A, shall not exceed 3.5 %. Desi
29、gnationStructure Minimum length per unit massc Minimum average breaking strength UnbondedBonded Nominal dtexa/turns per metreb (tpm) m/kgN NT1NT1B78 dtex S 905-1140 3 Z 570-73036 30013.5 NT2NT2B156 dtex S 315-845 3 Z 285-53018 15027 NT3NT3B235 dtex S 450-690 2 Z 380-53018 15027 NT4NT4B235 dtex S 305
30、-690 3 Z 275-47012 10040 NT5NT5B235 dtex spinning 2 S 380-590 3 Z 270-415 or 470 dtex S 380-590 3 Z 270-415 6 050 80 NT6NT6B235 dtex spinning 3 S 315-435 3 Z 215-295 or 700 dtex S 315-435 3 Z 215-295 4 025120 NT7NT7B235 dtex spinning 4 S 295-375 3 Z 155-295 or 470 dtex spinning 2 S 295-375 3 Z 155-2
31、95 or 950 dtex S 295-375 3 Z 155-295 3 025 160 NT8NT8B235 dtex spinning 5 S 215-295 3 Z 120-195 or 1160 dtex S 215-295 3 Z 120-195 2 425 200 NT9NT9B110 dtex S 445-965 3 Z 405-57024 20020 NT10NT10B 235 dtex S 295-500 4 Z 250-3509 05054 NT11NT11B 940 dtex spinning 2 S 180-280 3 Z 105-200 or 470 dtex s
32、pinning 4 S 180-280 3 Z 105-200 1 400 335 NT12NT12B 312 dtex S 430-600 3 Z 295-3759 05054 NOTEThe finished twist direction may be reversed from that specified (in which case the primary twist direction is also reversed) and should be the subject of a contract or order. a 1 dtex = 1 dg/km 0.1 mg/m. b
33、 When determined in accordance with BS 2085:1973. c The values stated exclude the mass of added dye and/or finish. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 BSI 07-19993 7.5 Sewing properties (type test) 7.5.1 Threads of
34、 minimum length per unit mass of not less than 9 000 m/kg shall be tested in accordance with Annex B. The stitching pattern shall be completed without slipped or broken stitches, and there shall not be more than two malformed stitches. 7.5.2 Threads other than those specified in 7.5.1 shall be teste
35、d in accordance with Annex C. The stitching patterns shall be completed without slipped or broken stitches, and there shall not be more than two malformed stitches. Table 3 Loop breaking load 8 Identification The thread shall be identified for ordering purposes by the number and date of this British
36、 Standard, i.e. BS 4F 120:19931), together with the relevant designation given in Table 2 and, if required dyed, the colour. NOTEThis identification may be codified. For example, thread NT5 required bonded and dyed NATO Green may be identified as BS 4F 120:1993/NT5B/BS 381C/285. DesignationMinimum a
37、verage loop breaking load UnbondedBondedN NT1NT1B16 NT2NT2B32 NT3NT3B32 NT4NT4B48 NT5NT5B96 NT6NT6B144 NT7NT7B192 NT8NT8B240 NT9NT9B24 NT10NT10B64 NT11NT11B402 NT12NT12B64 1) Marking British Standard 4F 120:1993 on or in relation to a product represents a manufacturers declaration of conformity, i.e
38、. 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 declaration is not to be confused with third party certification of conformity, which may also be desirable. Licensed Copy:
39、sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 4 BSI 07-1999 Annex A Method for determination of boiling water shrinkage of sewing thread A.1 Principle The length of specimen loops of thread under a defined tension is measured first without
40、 treatment and second after being immersed in boiling water, rinsed and dried. A.2 Apparatus A.2.1 Testing frame, comprising a vertical support on which a metric scale and a horizontal pin are mounted, as illustrated in Figure A.1. A.2.2 Tensioning weight, which, when freely suspended from a loop of
41、 thread, applies a downward force of 0.125 cN/tex. The mass W (in g) of this weight, subject to a tolerance of 10 %, is calculated from the following equation: where T is the thread tex. A.2.3 Drying oven, conforming to BS 2648:1955. A.2.4 Distilled water A.3 Atmosphere for conditioning and testing
42、The conditioning and testing atmosphere shall be the standard atmosphere for testing defined in BS F 100, i.e. a relative humidity of 65 2 % and a temperature of 20 2 C. A.4 Procedure A.4.1 Determine the linear density (in tex) of the thread from each package in the laboratory sample by the method d
43、escribed in BS 2010:1963. A.4.2 From each skein used to determine the linear density cut five specimens of thread, each 1 m long, and knot the ends of each length together to form five loops of thread. Take care during this process to retain the initial thread twist. Place the looped test specimens
44、in the standard atmosphere for testing (A.3) until moisture equilibrium is reached. NOTEEquilibrium is usually reached in 1 h. A.4.3 Suspend each looped test specimen in turn from the horizontal pin of the testing frame (A.2.1) and gently attach the tensioning weight (A.2.2) to the bottom of the loo
45、p, taking care that the knot does not touch either the pin or the weight. Measure the distance (L1) between the centre of the horizontal pin and the point of attachment of the weight. A.4.4 Remove the tensioning weight and immerse the untensioned specimen for 15 min in boiling distilled water (A.2.4
46、) at 100 2 C. W T 4 - -= Figure A.1 Thread loop and tensioning weight suspended on testing frame Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 07:36:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4F 120:1993 BSI 07-19995 A.4.5 Allow the specimen to dry. NOTEDrying may be considered comple
47、te after 1 h in a ventilated drying oven (A.2.3) at 60 C, in which the specimen should not be exposed to direct radiation from the heating elements, or after 12 h exposure to the standard atmosphere for testing. A.4.6 Suspend each looped specimen in turn from the horizontal pin of the testing frame
48、and leave in the standard atmosphere for 1 h. A.4.7 Reattach the tensioning weight to the bottom of the loop and remeasure the distance (L2) between the centre of the horizontal pin and the point of attachment of the weight. A.5 Expression of results The boiling water shrinkage S of each specimen, e
49、xpressed as a percentage, shall be calculated from the following equation: where The arithmetic mean of the five individual values for each package in the laboratory sample shall be calculated and expressed as the mean boiling water shrinkage. Annex B Method of test for sewing properties (threads of length per unit mass not less than 9 000 m/kg) B.1 Apparatus The apparatus required is a twin-needle lock stitch sewing machine, capable of a stitching r
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