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1、lNTERNATlONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDlZATlON .MEYfiYHAPOnHAR OPTAHA3AUWR II0 CTAHAPTM3AUMA.ORGANISATION INTERNATIONALE DE NORMALISATION Fishing nets - Cutting knotted netting to shape (“tapering”) First edition - 1973-07 -01 j ,jJ$? S, *,+ jJJ:8 4 Jj)Ji.; $ A UDC 677.64 : 63
2、9.2.081 .I 1 Descriptors : textiles, nets, fishing nets, cutting, designation, describing. Ref. No. IS0 1532-1973 (E) Price based on 5 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale,
3、04/27/2007 20:10:43 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 Member Bodies). The work of developing International Standards is carried ou
4、t through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governme nfdl, in liaison with ISO, also take part in the work. Draft Int
5、ernational Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. Prior to 1972, the results of the work of the Technical Committees were published as IS0 Recommendations; these documents a
6、re now in the process of being transformed into International Standards. As part of this process, International Standard IS0 1532 replaces IS0 Recommendation R 1532-1970 drawn up by Technical Committee ISO/TC 38, Textiles. The Member Bodies of the following countries approved the Recommendation : Au
7、stralia Belgium Brazil Czechoslovakia Denmark Egypt, Arab Rep. of France Germany Greece Hungary India Iran Israel Italy Japan Netherlands Norway Peru Poland Portugal Romania South Africa, Rep. of Spain Sweden Switzerland Turkey United Kingdom U.S.S.R. No Member Body expressed disapproval of the Reco
8、mmendation. 0 International Organization for Standardization, 1973 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or network
9、ing permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 1532-1973 (E) Fishing nets - Cutting knotted netting to shape (“tapering”) 1 SCOPE AND FIELD OF APPLICATION This International Standard defines the different kinds of cutting knotted netting to shape by straight cut, the types o
10、f cutting (N-, T-and Bar-cut) and gives rules for the designation of the cutting rate. 2 REFERENCE IS0 1107, Fishing nets - Netting - Basic terms and definitions. ) 3 TERMINOLOGY The expression cutting knotted netting to shape is here understood to mean the cutting from knotted netting of pieces in
11、the shape of trapezia, triangles, parallelograms or other polygons. 4 TYPES OF CUTTING Depending on the desired final shape of the netting, tapering cuts must be made in suitable ways, The various cutting rates are obtained by combining different lengths of cuts, either along a row of sequential kno
12、ts (N- or T-cuts respectively) or parallel to a line of sequential mesh bars (B-cuts). See IS0 1107. The cuts along a row of sequential knots are distinguished by their situation in the drawing of the net or in the netting that has been hung up for tapering as described in 4.1.1 and 4.1.2. 4.1 K-cut
13、s (knot cuts) : Cuts just beyond the knots. Symbol K NOTE - The term “K-cut” may he used instead of the two following terms in cases where the relation to the general course of the netting yarn is insignificant. 4.1.1 N-cut (vertical cut) : A cut at right angles to the general course of the netting
14、yarn just beyond the knots. Symbol N General course of the yarn - FIGURE 1 4.1.2 T-cut (horizontal cut) : A cut parallel to the general course of the netting yarn just beyond the knots. Symbol T Genercurse of theyarn Direction of cut - C FIGURE 2 I) At present at the stage of draft. (Revision of ISO
15、/R 1107.) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 1532-1973 (E) 4.2 Bar-cut : A cut
16、 parallel to a line of sequential mesh bars, each from adjacent meshes, and severing one or more bars. Symbol B FIGURE 3 5 CUTTING RATE 5.1 Definition of the cutting rate To obtain a desired shape and area of netting by tapering, N-or T-cuts and B-cuts of a distinct length must follow each other in
17、a rhythmical way. This rhythmical alternation of the various types of cuts is called “cutting rate”. 5.2 Designation of the cutting rate The cutting rate is determined by the lengths of consecutive sections of N- or T-cuts and B-cuts. The lengths of the various cuts are indicated - for the N- and T-
18、cuts by the number of consecutive meshes cut ; - for the B-cut by the number of consecutive bars severed along the cutting edge, not counting the bars on the preceding knot. To describe the cutting rate for tapering netting, the number and the type of each cut are indicated, giving first N- or T-cut
19、s, then B-cuts. The following combinations are used for cutting netting to shape : N-and B-cuts T- and B-cuts N- and T-cuts Exceptions are cutting rates where any of the named types of cutting is used alone. For these the following symbols are valid : AB = all bars cut AN = all cuts entirely in N-di
20、rection (at right angles to the general course of the netting yarn) AT = all cuts entirely in T-direction (parallel to the general course of the netting yarn) 5.3 Examples of the designation of the cutting rate 5.3.1 Example : lN2B means the rhythmical alternation of one N-cut and two Bcuts. FIGURE
21、4 5.3.2 Example : lT2B means the rhythmical alternation of one T-cut and two B-cuts. FIGURE 5 5.3.3 Example : lN2T means the rhythmical alternation of one N-cut and two T-cuts. FIGURE 6 NOTE - Examples of tapering are given in the Annex. 2 Copyright International Organization for Standardization Pro
22、vided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO1532-1973(E) 6 VARIOUS KINDS OF CUTTING (TAPERING) 6.1 By tapering only one edge of the netting, right-a
23、ngled trapezia or right-angled triangles are made. v FIGURE 7 FIGURE 8 6.2 By using the same cutting rate in the same direction on two opposite edges of the netting, parallelograms are made. In the case of netting in the shape of a parallelogram, the triangular piece cut off on one side may be joine
24、d to the other edge (see Figure IO). 6.3 Netting in the shape of isosceles trapezia or isosceles triangles FIGURE 11 FIGURE 12 The area of such netting may be divided into two right-angled trapezia or triangles respectively, each of these parts being tapered correspondingly in opposite directions. F
25、or triangular shaped netting (see Figure 12) each of the two halves must be tapered to a point. 6.4 Netting in the shape of asymmetrical trapezia FIGURE 13 FIGURE 14 The area of such netting may be divided into one right-angled trapezium and one right-angled triangle respectively, each of these part
26、s being tapered correspondingly. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or networking permitted without license from IHS -,-,- Piece of net
27、ting required 0-l E+! 5. m 7 2n 5 : g”- s L?. “2 ;z (0 m I g 4 -. g: q z $ n3 $ i 22 m z. ?c$ Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or netwo
28、rking permitted without license from IHS -,-,- IS0 1532-1973 (E) Machine selvedge P .L ts E E? ,- z F % al P .- a Taper cuts gaining meshes in suspended netting. Cutting away from the piece - tapered piece on left. 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:10:43 MDTNo reproduction or networking permitted without license from IHS -,-,-