BS F 138-1991 Specification for polyester plain (bobbin) netting suitable for aerospace purposes《航空航天用聚酯纤维平纹(线轴)网规范》.pdf
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1、BRITISH STANDARD BS F138:1991 Specification for Polyester plain (bobbin) netting suitable for aerospace purposesBSF138:1991 This BritishStandard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into
2、effect on 28June1991 BSI01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/54 Draft for comment90/77307DC ISBN 0 580 19439 6 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Aerospace Standards
3、 Policy Committee (ACE/-) to Technical Committee ACE/54, upon which the following bodies were represented: British Fabric Association British Rubber Manufacturers Association British Textile Employers Association Man-made Fibres Producers Committee Ministry of Defence Society of British Aerospace Co
4、mpanies Limited Society of Dyers and Colourists Amendments issued since publication Amd. No. Date CommentsBSF138:1991 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 General requirements 1 3 Yarn 1 4 Manufacture of netting 1 5 Finish 2 6 Construction and
5、 properties of finished netting 2 7 Dimensional stability 2 8 Identification 2 Appendix A Information to be supplied by the purchaser 3 Appendix B Determination of total hole count 3 Appendix C Faults, method of marking and acceptance limits 4 Figure 1 Determination of total hole count 3 Table 1 Gen
6、eral requirements (given in BS F100) 1 Table 2 Nominal yarn construction 2 Table 3 Construction and properties of finished netting 2 Publication(s) referred to Inside back coverBSF138:1991 ii BSI 01-2000 Foreword This BritishStandard, prepared under the direction of the Aerospace Standards Policy Co
7、mmittee, is one of a series for textiles of a quality suitable for aerospace purposes. It specifies the requirements for polyester netting for use primarily in parachute equipment. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards a
8、re 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, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard ha
9、s been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BSF138:1991 BSI 01-2000 1 1 Scope This BritishStandard specifies requirements for two types of polyester plain (bobbin) netting for aerospace purposes
10、. NOTEThe information to be supplied by the purchaser in the contract or order is listed in Appendix A. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. NOTEThe latest revision of an Aerospace Series Standard is indicated by a prefix number. 2 Gene
11、ral requirements 2.1 In addition to the requirements specified in clauses3 to8, the following sections and clauses of the latest edition of BS F100 shall apply (seeTable 1.) 2.2 The tenacity shall be determined when the yarn has been tested in accordance with method A of BS1932-1 except that the num
12、ber of tests required to produce a package mean shall be5. 2.3 The yarn twist shall be determined in accordance with BS2085 except that the number of tests required to produce a package mean shall be5. 2.4 The total hole count shall be determined in accordance with Appendix B. 2.5 Faults shall be cl
13、assified in accordance with Appendix C. 3 Yarn 3.1 Type The netting shall be manufactured from high tenacity, bright polyester (polyethyleneterephthalate) continuous filament yarn. 3.2 Property The nominal tenacity of the yarn shall be63cN/tex to73cN/tex. 3.3 Construction 3.3.1 The yarn shall have t
14、he nominal construction given in Table 2. 3.3.2 The warp yarn shall be twist set and relaxed. 4 Manufacture of netting The netting shall be manufactured using a plain (bobbin) net machine having a normal12 motion bobbinet. NOTEThe conventional weaving term “weft” does not apply to plain (bobbin) net
15、ting. The term “width way” is used in this specification to identify the widthwise direction of the finished netting. Table 1 General requirements (given in BS F100) Section Title Requirements and tests 1 General All requirements 2 Quality requirements Requirements for the manufacture of wide fabric
16、s Requirements for dyed textiles Requirements for dimensions and tolerances: general and wide fabrics Requirements for freedom from corrosive impurities(seesection4) Requirements for freedom from faults: method of marking and acceptance limits 3 Physical tests Tests for mass of wide fabrics Test for
17、 bursting strength: wounded burst Test for dimensional stability on heating: dry heat 4 Chemical tests If required by section2. test for freedom from corrosive impuritiesBSF138:1991 2 BSI 01-2000 Table 2 Nominal yarn construction 5 Finish 5.1 General 5.1.1 Netting1405 shall be supplied either: a) he
18、at set(see5.2) and scoured; or b) heat set(see5.2), scoured and dyed(see5.3). 5.1.2 Netting1414 shall be supplied either: a) heat set(see5.2), scoured and polyvinylacetate (PVA) finished(see5.4); or b) heat set(see5.2), scoured, dyed(see5.3) and PVA finished(see5.4). NOTEThe netting designation and
19、finish required should be stated in the contract or order(seeAppendix A). 5.2 Heat setting The netting shall be heat set at a temperature of195 5 C. 5.3 Dyeing Where dyeing is required, the colour shall be specified by reference to a BritishStandard, e.g.BS381C, or otherwise by pattern. NOTEThe colo
20、ur required should be stated in the contract or order(seeAppendix A). 5.4 Polyvinylacetate (PVA) finish Netting1414 shall be treated with polyvinylacetate (PVA), cured at a temperature of150 C to155 C, to give an added nominal mass of0.7% to1.0% on mass per unit area. Netting1405 shall not be PVA tr
21、eated. 6 Construction and properties of finished netting NOTEThe usable width of the finished netting should be as stated in the purchasers contract or order(seeAppendix A), but a usable width of920+25mm is usually supplied. When tested in accordance with clause2, the netting in the finished state s
22、hall comply with the requirements of Table 3 and clause7. 7 Dimensional stability The dimensional stability to dry heat shall not exceed2% when measured in the lengthwise direction and5% when measured in the widthwise direction. 8 Identification The netting shall be identified for ordering purposes
23、by the number of this BritishStandard, i.e.BS F138 1) , together with the relevant designation given in Table 2 and, if required dyed, the colour. NOTEThis identification may be codified. For example, netting1405 required dyed NATO green may be identified as follows: BS F138/1405 BS381C No.285. Tabl
24、e 3 Construction and properties of finished netting Netting designation Structure dtex/number of filaments (f)/turns per metre Warp Bobbin 1414 140f24S200 140f24 Spinning twist 1405 280f48S200 280f48 Spinning twist NOTE 1The tolerance on twist is 10%. NOTE 2The unit for twist is turn per metre (tpm)
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