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1、BRITISH STANDARD AEROSPACE SERIES BS 6F 34:1984 (Superseding BS 5F 34:1975) Incorporating Amendment No. 1 Specification for Light and medium duty linen (flax) sewing thread for aerospace purposes UDC 629.7:677.11.072.6 Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, U
2、ncontrolled Copy, (c) BSI BS 6F 34:1984 This British Standard, having been prepared under the direction of the Aerospace Standards Committee was published under the authority of the Board of BSI and comes into effect on 31 December 1984 BSI 02-2000 The following BSI references relate to the work on
3、this standard: Committee reference ACE/22 Draft for comment 83/79011 DC ISBN 0 580 14042 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Committee (ACE/-) to Technical Committee ACE/22 upon which the following bodie
4、s were represented: British Association of Clothing Machinery Manufacturers British Textile Employers Association Lambeg Industrial Research Association Linen Sewing Thread Manufacturers Association Man-made Fibres Producers Committee Ministry of Defence Narrow Fabrics Federation Society of British
5、Aerospace Companies Limited Society of Dyers and Colourists Amendments issued since publication Amd. No.Date of issueComments 6069November 1989 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6F 34:19
6、84 BSI 02-2000i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2General requirements1 3Yarn1 4Finish1 5Construction and properties of sewing threads1 6Identification1 Table 1 Construction and properties2 Publications referred toInside back cover Licensed Copy: sheffieldun
7、sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6F 34:1984 ii BSI 02-2000 Foreword This British Standard, prepared under the direction of the Aerospace Standards Committee, is one of a series for textiles of a quality suitable for aerospace purposes. It is a revisi
8、on of BS 5F 34:1975 which is withdrawn. This standard now specifies that all thread be supplied rotproofed, and the previous requirement for rotproofing by the copper chrome process has been deleted in favour of the pentachlorophenyl laurate (PCPL) process. A British Standard does not purport to inc
9、lude 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, page
10、s i and ii, pages 1 and 2, 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: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT
11、+00:00 2006, Uncontrolled Copy, (c) BSI BS 6F 34:1984 BSI 02-20001 1 Scope This British Standard specifies the requirements for light and medium duty linen sewing thread for aerospace purposes. NOTE 1The titles of the publications referred to in this standard are listed on the inside back cover. NOT
12、E 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 clause 3 to 6 of this standard, the following sections and clauses of the latest edition of BS F 100 shall apply. 2.2 Threads manufactured i
13、n accordance with this standard shall comply with 2.2.1 and 2.2.2. 2.2.1 Freedom from defects 2.2.1.1 Threads shall have uniformity of thickness, construction, and component ply tension so that there are no visually irregular twist defects. 2.2.1.2 Threads of length per unit mass less than 6 000 m/k
14、g shall contain no thread knots. 2.2.1.3 Threads of length per unit mass greater than 6 000 m/kg shall not contain more than two thread knots per package. 2.2.2 Length per unit mass. The length per unit mass of thread shall be determined in accordance with method A of BS 2010. 3 Yarn 3.1 The thread
15、shall be manufactured from flax fibre (Linum usitatissimum) in a three-fold construction. 3.2 The mass of the yarn shall have been reduced by not less than 10 %, by boiling. NOTEThe degree of boiling of the yarn should be determined from the manufacturers records, if available. Otherwise, the Residu
16、al Alkali Solubility of the thread should be determined and should not exceed 10 %. 4 Finish 4.1 Condition of material The thread shall be supplied in one of the following conditions: a) undyed and rotproofed; b) undyed, rotproofed and wax finished; c) dyed and rotproofed, or; d) dyed, rotproofed an
17、d wax finished. 4.2 Dyeing Where dyeing is required, the colour shall be specified by reference to an official standard, e.g. BS 381C, or otherwise by pattern. NOTEReference to an official standard, e.g. BS 381C is preferable. 4.3 Rotproofing The thread shall be treated with pentachlorophenyl laurat
18、e (PCPL) from aqueous emulsion in accordance with BS 2087-1, normal process. 4.4 Wax finishing Where wax finishing is required, beeswax substitute microcrystalline hydrocarbon wax shall be used and the added mass due to the wax shall be 20 5 %. Prior to waxing, the thread shall have been rotproofed
19、in accordance with 4.3. 4.5 Surface finish The thread supplied in accordance with 4.1 a) and 4.1 c) shall be polished, but substances which promote microbiological growth (e.g. starch or modified starch) shall not be applied. 5 Construction and properties of sewing threads 5.1 The thread shall compl
20、y with the requirements given in Table 1. 5.2 The direction of final twist shall be Z. 6 Identification The thread shall be identified for ordering purposes by the number of this British Standard, i.e. BS 6F 54 together with the relevant designation number given in Table 1, the finish and, where req
21、uired, the colour. NOTEThis identification may be codified. For example, thread no. 12 required dyed black and rotproofed may be identified as “BS 6F 34/No. 12/black/PCPL/waxed”. General requirements (given in BS F 100) SectionTitleRequirements and tests 1GeneralAll requirements 2aQuality requiremen
22、ts Requirements for dyed textiles except those relating to fabric intended for coating Requirements for freedom from corrosive impurities (see section 4) 3Physical tests Test for breaking strength and extension under load 4Chemical tests If required by section 2, further tests for freedom from corro
23、sive 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. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, Uncon
24、trolled Copy, (c) BSI BS 6F 34:1984 2 BSI 02-2000 Table 1 Construction and properties Designation Nominal resultant count Final turns per metre Length/mass of undyed, unproofed thread Minimum average breaking strength UnwaxedWaxed No. 12 No. 18 No. 25 No. 30 No. 35 No. 40 No. 50 No. 60 No. 70 No. 80
25、 tex 420 275 200 170 145 125 100 84 71 63 275 40 355 40 435 40 470 40 510 40 550 40 590 40 630 40 690 60 730 60 m/kg 2 400 3 650 5 050 6 050 7 050 8 050 10 100 12 100 14 100 16 100 5 % N 110 71 53 45 36 31 27 22 16 13 N 89 57 43 36 28 25 21 18 NOTE 1Determine the final turns per metre in accordance
26、with BS 2085. NOTE 2Determine the length per unit mass of undyed, unproofed thread by weighing a skein conditioned and reeled in accordance with BS 2010. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6F 34:1984 BSI 02-2000 Publications
27、referred to BS 381C, Specification for colours for identification, coding and special purposes. BS 2010, Method for determination of the linear density of yarns from packages. BS 2085, Method of test for determination of twist in yarns, direct counting method. BS 2087, Preservative treatments for te
28、xtiles. BS 2087-1, Specification for treatments. BS F 100, Procedure for inspection and testing of textiles. Licensed Copy: sheffieldun sheffieldun, na, Wed Dec 06 12:21:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6F 34:1984 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institu
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