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1、BRITISH STANDARD AEROSPACE SERIES BS 7F 34:2002 (Superseding BS 6F 34:1984) Light and medium duty linen (flax) sewing thread for aerospace purposes ICS 49.025.60 ? Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BS
2、I BS 7F 34:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Sector Policy and Strategy Committee 17 October 2002 BSI 17 October 2002 First published BS F 34:1919 Second edition BS 2F
3、 34:1930 Third edition BS 3F 34:1934 Fourth edition BS 4F 34:1960 Fifth edition BS 5F 34:1975 Sixth edition BS 6F 34:1984 Seventh edition BS 7F 34:2002 The following BSI references relate to the work on this standard: Draft for comment 00/707766 DC Committee reference ACE/22 ISNB 0 580 36951 X Commi
4、ttees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/22, Cords, ropes and threads for aerospace purposes, upon which the following bodies were represented: Linen Sewing Threads Manufacturers Association Ministry of Defence UK D
5、efence Standardization Society of British Aerospace Companies Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 BSI 17 October 2002 i Co
6、ntents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3General1 4Yarn2 5Finish2 6Construction and properties3 7Identification3 Bibliography5 Table 1 General requirements (given in BS F 100)1 Table 2 Construction and properties3 Licensed Copy: London South Ban
7、k University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 ii BSI 17 October 2002 Foreword This British Standard, prepared under the direction of Technical Committee ACE/22, is one of a series for textiles of a quality suitable for aerosp
8、ace purposes. It supersedes BS 6F 34:1984 which is withdrawn. NOTEThe previous edition, BS 6F 34:1984, deleted rotproofing by the copper chrome process and required that all thread be supplied rotproofed by the pentachlorophenyl laurate (PCPL) process. This new edition incorporates all earlier amend
9、ments, updates references and improves nomenclature in line with other standards in the same series. 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 of itself confe
10、r immunity from legal obligations. WARNING NOTES This standard calls for the use of substances and/or test procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves either the supplier or the user from statutory o
11、bligations relating to health and safety at any stage of manufacture or use. This standard specifies pentachlorophenyl laurate (PCPL) as the only approved rotproofing treatment for aerospace textiles. Alternative treatments are under development, and this standard will be updated to delete PCPL as s
12、oon as an approved alternative treatment for aerospace textiles is available. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 5 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.
13、 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 BSI 17 October 2002 1 1 Scope This British Standard specifies the requirements for light and medium duty linen sewing thread for aerospace purposes
14、. NOTEThe latest revision of an Aerospace Series standard is indicated by a prefix number. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editio
15、n of the referenced document (including any amendments) applies. BS 2087-1, Preservative treatments for textiles Specification for treatments. BS F 100, Procedure for inspection and testing of textiles for aerospace purposes. BS EN ISO 2060:1995, Textiles Yarn from packages Determination of linear d
16、ensity (mass per unit length) by the skein method. BS EN ISO 2061, Textiles Determination of twist in yarn Direct counting method. 3 General 3.1 In addition to the requirements specified in Clause 4, Clause 5, Clause 6 and Clause 7 of this standard the requirements and tests given in the latest edit
17、ion of BS F 100 as specified in Table 1, shall apply. Table 1 General requirements (given in BS F 100) 3.2 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 mass les
18、s than 6 000 m/kg shall contain no thread knots. Threads of length per unit mass greater than 6 000 m/kg shall not contain more than two thread knots per package. 3.3 Length per unit mass The length per unit mass of thread shall be determined in accordance with BS EN ISO 2060:1995, Option 1. Section
19、 of BS F 100 Section titleRequirements and tests 1GeneralAll requirements 2aQuality requirements Requirements for dyed textiles except those related to fabric intended for coating Requirements for freedom from corrosive impurities (see BS F 100, Section 4) 3Physical testsTests for breaking strength
20、and extension under force 4Chemical tests Test for residual alkali solubility If required by BS F 100, 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 not intended that BS F 100, Secti
21、on 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 F 100. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolle
22、d Copy, (c) BSI BS 7F 34:2002 2 BSI 17 October 2002 4 Yarn 4.1 The thread shall be manufactured from flax fibre (Linum usitatissimum) in a three-fold construction. 4.2 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 dete
23、rmined from the manufacturers records, if available. Otherwise, the residual alkali solubility of the thread should be determined and should not exceed 10 %. 5 Finish 5.1 Condition of material The thread shall be supplied in one of the following conditions: a) undyed and rotproofed; b) undyed, rotpr
24、oofed and wax finished; c) dyed and rotproofed; or d) dyed, rotproofed and wax finished. 5.2 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.
25、5.3 Rotproofing The thread shall be treated with pentachlorophenyl laurate (PCPL) from aqueous emulsion in accordance with BS 2087-1, normal process. 5.4 Wax finishing Where wax finishing is required, beeswax substitute microcrystalline hydrocarbon wax shall be used and the added mass due to the wax
26、 shall be (20 5) %. Prior to waxing, the thread shall have been rotproofed in accordance with 5.3. 5.5 Surface finish The thread supplied in accordance with 5.1a) and 5.1c) shall be polished, but substances which promote microbiological growth (e.g. starch or modified starch) shall not be applied. L
27、icensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 BSI 17 October 2002 3 6 Construction and properties 6.1 The thread shall conform to the requirements given in Table 2. Table 2 Construction and prope
28、rties 6.2 The direction of final twist shall be Z. 7 Identification The thread shall be identified by the following: a) the number of this British Standard, i.e. BS 7F 34; b) the relevant designation number given in Table 2; c) the finish; d) the colour (where required). NOTEThis identification may
29、be codified. For example, thread No. 12 required dyed black and waxed may be identified as “BS 7F 34/No. 12/black/waxed”. DesignationNominal resultant linear density Final twistaLength per unit massbMinimum average breaking strength unwaxedwaxed texTurns/mm/kgNN No. 12420275 402 400 5 %11089 No. 182
30、75355 403 650 5 %7157 No. 25200435 405 050 5 %5343 No. 30170470 406 050 5 %4536 No. 35145510 407 050 5 %3628 No. 40125550 408 050 5 %3125 No. 50100590 4010 100 5 %2721 No. 6084630 4012 100 5 %2218 No. 7071690 6014 100 5 %16 No. 8063730 6016 100 5 %13 a The final twist shall be determined in accordan
31、ce with BS EN ISO 2061. b The length per unit mass shall be determined by weighing a skein conditioned and reeled in accordance with BS EN ISO 2060:1995, Option 1. The values stated for length per unit mass exclude the mass of added dye and/or finishes. Licensed Copy: London South Bank University, L
32、ondon South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 BSI 17 October 2002 5 Bibliography Standards pub
33、lications BS 381C:1996, Specification for colours for identification, coding and special purposes. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:59:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7F 34:2002 BSI 389 Chiswick High Road London W4 4AL BSI Brit
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