1、BRITISH STANDARD BS 633:1970 Specification for Cotton selvedge tapes and webbing for electrical purposesBS633:1970 This British Standard, havingbeen approved by the Electrical Industry Standards Committee, was published underthe authority of the Executive Board on 31 March 1970 BSI 12-1999 First pub
2、lished March 1950 First revision 31 March 1970 The following BSI references relate to the work on this standard: Committee reference ELE/16 andELE/16/53/11 Draft for comment 66/15118 ISBN 580 05788 7 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this
3、 British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Association of Consulting Engineers Association of Mining Electrical and Mechanical Engineers Association of Super
4、vising Electrical Engineers British Electrical and Allied Manufacturers Association* British Railways Board British Radio Equipment Manufacturers Association Crown Agents for Oversea Governments and Administrations Department of Employment and Productivity Electric Cable Makers Confederation Electri
5、cal Contractors Association (Incorporated) Electrical Contractors Association of Scotland Electrical Research Association* Electricity Council, the Central Electricity Generating Board and the Area Boards in England and Wales* Electronic Engineering Association* Engineering Equipment Users Associati
6、on Institution of Electrical Engineers Lighting Industry Federation Ltd. Ministry of Technology* Ministry of Defence Ministry of Defence, Army Department* Ministry of Defence, Navy Department* Ministry of Power Ministry of Public Building and Works Municipal Passenger Transport Association (Incorpor
7、ated) National Inspection Council for Electrical Installation Contracting National Physical Laboratory (Ministry of Technology) Oil Companies Materials Association Post Office* Public Transport Association (Incorporated) South of Scotland Electricity Board The Government departments and scientific a
8、nd industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Plastics Federation Glass Textile Association Narrow Fabrics Federation Radio and Electronic
9、 Component Manufacturers Federation Tape Manufacturers Association Telephone Manufacturers Technical Development Committee Amendments issued since publication Amd. No. Date CommentsBS633:1970 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Definition
10、s 1 3 General 2 4 Weave 2 5 Width 2 6 Kind and count of yarn 3 7 Warp threads 3 8 Weft threads 4 9 Thickness 4 10 Breaking load in warp direction 5 11 Conductivity of aqueous extract of scoured tapes 5 12 pH value of aqueous extract (optional test) 5 13 Length of roll 5 Appendix A Conditioning of te
11、st pieces 6 Appendix B Determination of width 6 Appendix C Determination of thickness 6 Appendix D Determination of breaking load in warp direction 7 Appendix E Conductivity of aqueous extract 8 Appendix F Determination of length of roll 9 Figure 1 Cells for determination of conductivity of aqueous
12、extract 10 Table 1 Nominal widths and tolerances on width 2 Table 2 Minimum number of warp threads 3 Table 3 Minimum number of weft threads per unit width 4 Table 4 Thickness of tape and webbing 4 Table 5 Minimum breaking load of tape 4BS633:1970 ii BSI 12-1999 Foreword This standard makes reference
13、 to the following British Standards: BS 572, Interchangeable conical ground glass joints. BS 907, Dial gauges for linear measurement. BS 947, Yarn count systems and their conversions. BS 1610, Verification of testing machines. BS 3718, Laboratory humidity ovens (non-injection type). This revision of
14、 BS633 supersedes the1950 edition. In order to familiarize the reader with the use of the metric system of weights and measures, metric conversions are given for information, including the Tex system of yarn count (seeBS947, “Yarn count systems and their conversions”). The method of determination of
15、 the conductivity of the aqueous extract of scoured tapes has been revised. NOTE 1Where metric equivalents are stated in brackets, the figures in imperial units should be regarded as the standard. The metric units are approximate. For more accurate conversions reference should be made to BS350, “Con
16、version factors and tables”. 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 immunity from legal obligations. Summary of p
17、ages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10 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.BS633:1970 BSI 12-1999
18、1 1 Scope This British Standard specifies requirements and dimensions for the following classes of unbleached cotton tape and webbing with selvedges: Extra fine insulating tape Fine insulating tape Ordinary (or dynamo) tape Webbing Heavy webbing The tape may be either scoured or unscoured. Appropria
19、te requirements are given for each variety. 2 Definitions For the purposes of this British Standard the following definitions apply: NOTEIn some places the term “tape” is used in a general sense which includes webbing. 2.1 count of yarn a number indicating the mass per unit length or the length per
20、unit mass of a yarn NOTEVarious count systems are in use, using different units of mass and length (seeBS947, “Yarn count systems and their conversions”). the count of a yarn on the cotton system is the number of hanks, each of840yards, per pound the count of a yarn on the tex system is the weight i
21、n grammes per kilometre of yarn there is then a reciprocal relation between cotton count and tex, given by the relation: 2.2 end an individual warp thread 2.3 loom state refers to material as it comes from the loom, without any further processing 2.4 pick an individual weft thread 2.5 plain weave th
22、e simplest form of thread interlacing in which adjacent warp threads pass, respectively, over and under the same weft thread, and under and over the next weft thread 2.6 scouring treatment of textile materials in aqueous or other solutions in order to remove natural fats, waxes, proteins and other c
23、onstituents as well as dirt, oil and other impurities 2.7 selvedge longitudinal edge of a fabric formed during weaving, with the weft not only turning at the edges but also passing continuously across the width of the fabric from edge to edge 2.8 singe to remove protruding fibres by burning in a fla
24、me 2.9 single yarn a yarn not twisted with another yarn 2.10 two-fold yarn two yarns twisted together 2.11 2/2 twill a weave in which each warp thread passes over two successive weft threads, under the next two weft threads, over the next two, and so on. The weft threads are paired differently for n
25、eighbouring warp threads, to produce a diagonal line on the fabric surface in V and W twills the direction of this diagonal pattern is alternately R to L and L to R, in herringbone fashion, and the letter denotes the number of alternations within the fabric width 2.12 warp or ends threads lengthways
26、 in a fabric as woven 2.13 weave the pattern of interlacing of warp and weft in a woven fabric 2.14 weft or picks threads widthways in a fabric as woven tex 590.5 cotton count - =BS633:1970 2 BSI 12-1999 3 General 3.1 General requirements. Tape of every class shall be made of good quality cotton and
27、 woven from unsized two-fold warp yarn and shall be free from additives. The tape shall be woven with selvedges which shall be uniform. 3.2 Winding on cores. Tape of every class shall be wound on a hard core of sufficient strength to withstand the pressure of the tape when wound sufficiently tightly
28、 on it to withstand normal handling. The width of the core shall not exceed the width of the tape. NOTEWhen the maximum diameter of a roll is of importance, this should be specified by the purchaser. 3.3 Joins. Every roll of tape shall be as free from joins as practicable. The number of joins permit
29、ted shall be the subject of agreement between the purchaser and the manufacturer. Where a join is necessary the ends shall be overlapped, and shall be neatly sewn with cotton thread, the whole width of the tape. Pins or staples shall not be used for fastening the ends of a roll or for joining tape.
30、4 Weave 4.1 Extra fine, fine and ordinary (or dynmno) insulating tape. The weave of extra fine, fine andordinary tape shall be plain. The tape shall becalendered and, if so specified, shall be scoured and/or singed. No detergents shall be used in the scouring process. 4.1.1 The adequacy of singeing
31、shall be determined by visually inspecting the tapes for freedom from protruding fibres. 4.1.2 If specified, a coloured warp thread shall be woven into the tape. The colour and the position of the thread shall be the subject of agreement between the purchaser and the manufacturer. 4.2 Webbing. The w
32、eave of the webbing shall be2/2W twill. The webbing shall be in the loom state, unless otherwise specified. 4.3 Heavy webbing. The weave of the heavy webbing shall be a2/2V twill. The heavy webbing shall be in the loom state, unless otherwise specified. 5 Width The nominal widths of tape and webbing
33、 shall be as shown inTable 1. When determined as described inAppendix B, the actual width shall not differ from the nominal width by more than the appropriate tolerance given inTable 1. Table 1 Nominal widths and tolerances on width Nominalwidth Toleranceonwidth Metricequivalent of nominalwidth Extr
34、a fine Fine Ordinary Webbing Heavy webbing in in in in in in (mm) (mm) 1 / 4 3 / 8 1 / 2 1 / 4 3 / 8 1 / 2 1 / 2 1 / 2 1 / 32(0.8) (6.35) (9.5) (12.7) 5 / 8 3 / 4 1 5 / 8 3 / 4 1 5 / 8 3 / 4 1 3 / 4 1 1 / 16 (1.6) (15.9) (19.1) (25.4) 1 1 / 4 1 1 / 2 1 1 / 4 1 1 / 2 1 1 / 4 1 1 / 2 1 1 / 4 1 1 / 2 3
35、 / 32(2.4) (32) (39) 2 2 2 2 1 / 8 (3.2) (51) BS633:1970 BSI 12-1999 3 6 Kind and count of yarn The kinds and counts of yarn from which the standard tapes shall be made are respectively as follows: 6.1 Extra fine insulating tape. The yarn of which extra fine insulating tape is made shall consist of
36、Egyptian cotton or cotton of equivalent quality. It will be found that in order to meet the requirements of Clauses9 and10, all warp should be folded yarns not coarser than two-fold100s (R11.8tex/2 1) ) and the weft should be not coarser than two-fold140s (R8.4tex/2). 6.2 Fine insulating tape. The y
37、arn of which fine insulating tape is made shall consist of Egyptian cotton or cotton of equivalent quality and shall be not coarser than two fold60s (R19.7tex/2) for the warp and single32s for the weft (18.5tex). 6.3 Ordinary (or dynamo) tape. The yarn of which ordinary (or dynamo) tape is made shal
38、l consist of American cotton or cotton of equivalent quality, and shall be not coarser than two-fold28s (R42.2tex/2) for the warp and single26s for the weft (22.7tex). 6.4 Webbing. The yarn of which webbing is made shall consist of American cotton or cotton of equivalent quality and shall be not coa
39、rser than two-fold28s (R42.2tex/2) for the warp and single20s for the weft (29.5tex). 6.5 Heavy webbing. The yarn of which heavy webbing is made shall consist of American cotton or cotton of equivalent quality, and shall be not coarser than two-fold20s (R59tex/2) for the warp and two-fold28s for the
40、 weft (R42.4tex/2). 7 Warp threads The total number of warp threads in the tape shall be not less than the appropriate value given inTable 2. Table 2 Minimum number of warp threads 1) For particulars of the tex system, see definition for “count of yarn” in Clause2. The letter “R” in these designatio
41、ns is included to emphasize that the tex value is that of the resultant yarn. Nominalwidth Minimumnumberofwarpthreads Extrafine Fine Ordinary Webbing Heavy webbing in (mm) 1 / 4 3 / 8 1 / 2 (6.35) (9.5) (12.7) 31 43 53 27 36 45 37 49 5 / 8 3 / 4 1 (15.9) (19) (25.4) 65 75 97 53 62 79 44 51 61 71 94
42、1 1 / 4 1 1 / 2 2 (32) (38) (51) 96 113 148 77 91 118 118 141 188 125 150 200BS633:1970 4 BSI 12-1999 8 Weft threads The number of weft threads per inch (per decimetre) of nominal width shall be not less than the appropriate number given inTable 3. Table 3 Minimum number of weft threads per unit wid
43、th 9 Thickness 9.1 Tape. The thickness of the tape may have any specified or declared value within the appropriate limits given in Column3 ofTable 4. Preferred thicknesses are those shown in Column2 ofTable 4. For any specified or declared thickness, the mean thicknesses over the selvedges and betwe
44、en selvedges, when determined as described inAppendix C, shall not differ from the specified or declared thickness by more than the appropriate tolerance given in Column4 ofTable 4. 9.2 Webbing. Requirements for webbing are the same as those given for tape in9.1, except that only the preferred thick
45、nesses have been standardized. Table 4 Thickness of tape and webbing Table 5 Minimum breaking load of tape Class of tape Minimumnumberofweft threads perin (perdm a ) Extra fine Fine Ordinary Webbing Heavy webbing 60 42 30 36 40 (236) (165) (118) (142) (158) a 1dm = 100 mm = 3.937 in. 1 2 3 4 Class o
46、f tape Preferred thickness Thickness range Tolerance 0.001 in a (mm) 0.001 in a (mm) 0.001 in a (mm) Extra fine Fine Ordinary Webbing Heavy webbing 3 1 / 2 6 8 15 23 (0.09) (0.15) (0.2) (0.38) (0.58) 3 to 3 1 / 2 5 to 7 7 to 10 (0.08 to 0.09) (0.13 to 0.18) (0.18 to 0.254) 1 / 2 1 1 2 3 (0.013) (0.0
47、25) (0.025) (0.05) (0.08) 15 (0.38) only 23 (0.58) only a 0.001 in = 0.0254 mm and is sometimes known as1mil. Nominalwidth Minimumbreakingload Extra fine Fine Ordinary Webbing Heavy webbing in (mm) lbf a (N) lbf (N) lbf (N) lbf (N) lbf (N) 1 / 4 3 / 8 1 / 2 (6.35) (9.5) (12.7) 6 10 13 (26.5) (44.2)
48、(58.0) 19 22 25 (85.5) (98.1) (112) 32 (142) 40 (178) 5 / 8 3 / 4 1 (15.9) (19) (25.4) 16 19 24 (71.5) (85.5) (107) 29 33 40 (120) (147) (178) 37 42 50 (165) (187) (223) 70 88 (312) (391) 1 1 / 4 1 1 / 2 2 (32) (38) (51) 45 55 65 (200) (245) (290) 63 74 90 (281) (334) (400) 110 126 164 (489) (560) (
49、730) 150 165 200 (667) (735) (889) a 1lbf = 0.4539237kgf = 4.44821N.BS633:1970 BSI 12-1999 5 10 Breaking load in warp direction 10.1 Before heating. The breaking load of either scoured or unscoured tape in the warp direction, when determined as described inAppendix D, shall be not less than the appropriate value given inTable 5. 10.2 After heating. Specimens of tape taken from the same rolls as those
