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1、BRITISH STANDARD AEROSPACE SERIES BS F 134:1989 Specification for Continuous filament polyester sewing thread suitable for aerospace purposes UDC 629.7:677.01:677.494.674:620.1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled
2、 Copy, (c) BSI BS F 134:1989 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee (ACE/-) was published under the authority of the Board of BSI and comes into effect on 30 November 1989 BSI 11-1999 The following BSI references relate to the work
3、 on this standard: Committee reference ACE/22 Draft for comment 87/73781 DC ISBN 0 580 17260 0 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 fol
4、lowing bodies were represented: British Association of Clothing Machinery Manufacturers British Narrow Fabrics Association Cordage Manufacturers Institute Lambeg Industrial Research Association Linen Sewing Thread Manufacturers Association Man-made Fibres Producers Committee Ministry of Defence Soci
5、ety of British Aerospace Companies Limited Society of Dyers and Colourists Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 BSI 11-
6、1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2General requirements1 3Yarn1 4Construction and properties1 5Finish1 6Type tests1 7Identification2 Appendix A Determination of boiling water shrinking of sewing thread3 Appendix B Method of test for sewing properties (th
7、reads of length per unit mass not less than 9 000 m/kg)4 Appendix C Method of test for sewing properties (threads of length per unit mass less than 9 000 m/kg)5 Figure 1 Thread loop and tensioning weight suspended on testing frame3 Figure 2 Test piece for threads of length per unit mass not less tha
8、n 9 000 m/kg4 Figure 3 Test piece for threads of length per unit mass less than 9 000 m/kg5 Table 1 General requirements (given in BS F 100)1 Table 2 Construction and properties2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat
9、Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 ii BSI 11-1999 Foreword This British Standard, which has been 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.
10、This standard includes polyester sewing threads previously defined in Ministry of Defence Specification UK/AID/971 which is withdrawn. It differs from UK/AID/971 Issue 1 in that alternative thread constructions are permitted, and additional thread constructions are included. The applicable basic qua
11、lity requirements specified in BS F 100 have been identified. The quality assurance authority referred to in this standard is as stated in the contract or order, or the accredited representative of the authority stated as instructed by the prime contractors. A British Standard does not purport to in
12、clude 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. Summary of pages This document comprises a front cover, an inside front cover, pag
13、es 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 the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank Univ
14、ersity, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 BSI 11-19991 1 Scope This British Standard specifies requirements for a range of continuous filament polyester sewing threads for aerospace purposes. NOTE 1The titles of the publications referred to in this standard
15、 are listed on the inside back cover. NOTE 2The latest revision of an Aerospace Series standard is indicated by a prefix number. 2 General requirements 2.1 In addition to the requirements specified in clauses 3 to 7 of this standard, the following requirements and tests of the latest edition of BS F
16、 100 shall apply (see Table 1). Table 1 General requirements (given in BS F 100) 2.2 Threads manufactured in accordance with this standard shall comply with the following: a) Freedom from defects. Threads shall have uniformity of thickness, construction and component ply tension so that there are no
17、 visually irregular twist defects. 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
18、be determined in accordance with method A of BS 2010. 3 Yarn The threads shall be manufactured from bright continuous filament polyethylene terephthalate yarn. 4 Construction and properties 4.1 Threads shall comply with the requirements of Table 2, except that the twist directions may be reversed fr
19、om those specified. NOTEIt should be stated in the contract or order if the twist direction is to be other than as specified in Table 2. 4.2 Threads shall be supplied with twist levels selected from within the range given in Table 2. The tolerance on twist shall not vary from the level selected by m
20、ore 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 % 5 Finish 5.1 Condition of material The thread shall be supplied in one of the following conditions: a) undyed; b) undyed a
21、nd bonded; c) dyed; d) dyed and bonded. NOTEThe condition required should be stated in the contract or order. 5.2 Dyeing If required dyed, 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
22、contain substances known to promote microbiological growth. The added mass due to the dye and/or finish shall not exceed a total of 14 % of the original mass. NOTEA lubricating finish may be applied to the thread to facilitate its performance. 6 Type tests 6.1 General 6.1.1 The type tests specified
23、in 6.2 to 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 type tests being repeated to the satisfaction of the qualit
24、y assurance authority. 6.1.3 The manufacturers records of type approval tests shall be made available to the quality assurance authority on request. SectionTitleRequirements and tests 1GeneralAll requirements 2aQuality requirements Requirements for dyed textiles except those relating to fabric inten
25、ded for coating. Requirements for freedom from corrosive impurities (see section 4) 3Physical tests Tests for breaking strength and extension under load 4Chemical tests If required by section 2, further tests for freedom from corrosive impurities a It is not intended that section 2 tests should be p
26、erformed on each thread batch. The frequency of these tests should be agreed between the quality assurance authority and the thread manufacturer. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 2
27、BSI 11-1999 Table 2 Construction and properties 6.2 Extension under load (type test) The extension of the threads, when subjected to a load equal to 25 % of the specified breaking strength as defined in Table 2 for 60 5 s shall not exceed 14 %. 6.3 Shrinkage in boiling water (type test) When determi
28、ned in accordance with Appendix A the mean shrinkage of the threads in boiling water shall not 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 Appendix B. The stitching pattern shall be compl
29、eted without slipped or broken stitches and there shall not be more than two malformed stitches. 6.4.2 Threads other than those specified in 6.4.1 shall be tested in accordance with Appendix C. The stitching patterns shall be completed without slipped or broken stitches and there shall not be more t
30、han two malformed stitches. 7 Identification The thread shall be identified for ordering purposes by the number of this British Standard i.e. BS F 134, together with the relevant designation given in Table 2 and, if required dyed, the colour. NOTEThis identification may be codified. For example, thr
31、ead TT5 required bonded and dyed NATO Green may be identified as BS F 134/TT5B/BS 381C 285 NATO Green DesignationStructureMinimum length per unit massc Minimum average breakage strength UnbondedBonded Nominal dtex/turns per metreb (tpm) TT1 TT2 TT3 TT4 TT5 TT6 TT7 TT12 TT13 TT14 TT15 TT16 TT1B TT2B
32、TT3B TT4B TT5B TT6B TT7B TT12B TT13B TT14B TT15B TT16B 74 dtex S880 1160 X 3Z 540-770 138 dtex S650 870 X 3Z 380-500 280 dtex S450 610 X 3Z 380-490 280 dtex S500 610 X 3Z 315-410 280 dtex Spinning X 2S 380 545 X 3Z 250-350 or 550 dtex S380 545 X 3Z 250-350 280 dtex Spinning X 3S 324 545 X 3Z 200-285
33、 or 830 dtex S324 545 X 3Z 200-285 280 dtex Spinning X 4S 235 325 X 3Z 160-265 or 550 dtex Spinning X 2S 235 325 X 3Z 160-265 or 1 100 dtex S235 325 X 3Z 160-265 138 dtex S720 870 X 2Z 580-660 220 dtex S305 690 X 3Z 275-470 455 dtex S380 590 X 3Z 270-414 220 dtex Spinning X 3S 350-500 X 3Z 230-330 o
34、r 660 dtex S350 500 X 3Z 230-330 940 dtex S235 450 X 3Z 160-270 m/kg 37 000 19 750 14 910 10 000 4 750 3 135 2 325 29 600 12 350 5 750 3 950 2 770 N 10 20 30 45 85 135 180 15 36 70 102 153 NOTEThe twist direction may be reversed from those specified if stated in the contract or order (see 4.1). b Th
35、e twist shall be determined in accordance with BS 2085. c The values stated exclude the mass of added dye and/or finish. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 BSI 11-19993 Appendix A Det
36、ermination of boiling water shrinking of sewing thread A.1 Principle The length of specimen loops of thread under a defined tension is measured first without treatment and second after being immersed in boiling water, rinsed and dried. A.2 Apparatus A.2.1 Testing frame, comprising a vertical support
37、 on which are mounted a metric scale and a horizontal pin, as illustrated in Figure 1. A.2.2 Tensioning weight, which, when freely suspended from a loop of 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 as follows: wh
38、ere T = thread tex. A.2.3 Drying oven, complying with BS 2648. A.2.4 Distilled water, complying with BS 3978, grade 3. A.3 Atmosphere for conditioning and testing The conditioning and testing atmosphere shall be the standard atmosphere for testing defined in BS F 100, i.e. a relative humidity of 65
39、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 described in BS 2010. A.4.2 From each skein used to determine the linear density cut five specimens of thread, each 1 m long, and knot the
40、 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 in the standard atmosphere for testing until moisture equilibrium is reached. NOTEEquilibrium is usually reached in 1 h. A.4.3 Suspend each lo
41、oped test specimen in turn from the horizontal pin of the testing frame and gently attach the tensioning weight to the bottom of the loop, 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 attach
42、ment of the weight. A.4.4 Remove the tensioning weight and immerse the untensioned specimen for 15 min in boiling distilled water at 100 2 C. A.4.5 Allow specimen to dry. NOTEDrying may be considered complete after 1 h in a ventilated drying oven at 60 C, in which the specimen should not be exposed
43、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 and leave in the standard atmosphere for 1 h. A.4.7 Re-attach the tensioning weight to the bottom of t
44、he loop and measure the distance (L2) between the centre of the horizontal pin and the point of attachment of the weight. A.5 Expression of results Calculate the percentage shrinkage (S) of each specimen using the following equation: Calculate the arithmetic mean of the five individual values for ea
45、ch package in the laboratory sample and express this as the mean boiling water shrinkage. Figure 1 Thread loop and tensioning weight suspended on testing frame W T 4 - - g= S L1L2 L1 - - 100= Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 200
46、6, Uncontrolled Copy, (c) BSI BS F 134:1989 4 BSI 11-1999 Appendix 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 rate of 3 250 250 stitches/min
47、 at a pitch of 8 stitches per 25 mm, properly adjusted for tension, 8 mm gauge, and fitted with an appropriate needle. B.2 Test piece The test piece consists of four full width lengths, each approximately 1 m long of nylon fabric complying with the requirements of BS F 118/556 laid out in a stack. B
48、.3 Procedure Stitch the test piece at the rate given in B.1, as shown in Figure 2, 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 any slight looping at each corner. B.4 Examination Examine the test piece for slip
49、ped, broken or malformed stitches. Figure 2 Test piece for threads of length per unit mass not less than 9 000 m/kg Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:04:38 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS F 134:1989 BSI 11-19995 Appendix C Method of test for sewing properties (threads of length per unit mass less than 9 000 m/kg) C.1 Apparatus The apparatus required is a single-needle