NTERNATIONAL STANDARD (ISO) 3790 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION-MEXKAYHAPOHHAR OPTAHH3ALIMH HIO CTAHAAPTM3ALWM.ORGANISATION INTERNATIONALE DE NORMALISATION Fishing nets -- Determination of elongation of netting yarns Filets depeche-Determination de I'allongement des fils pour filets First edition 1976-07-01 AMST nerct Doc SecP UDC 677.664.22:620.172.222 Ref.No. ISO 3790-1976 (E) Descriptors : textiles, fishing nets, yarns, mechanical tests, tension tests, determination, elongation, breaking load. Price based on 4 pages FOREWORD ISo(the International Organization for Standardization)isa worldwidefederation of national standards institutes (iso Member Bodies).The work of developing International Standards is carried out through IsO Technical Committees. Every Member Body interested in a subject for which a Technical Committeehas been set up has the right to be represented on that Committee. International organizations governmental and non-governmental,in liaison with IsO,also take part in the work. Draft InternationalStandardsadoptedby theTechnical Committeesare circulated to the Member Bodies for approval before their acceptance as International Standards by the Iso Council. International Standard IS03790 wasdrawn up by Technical Committee ISO/TC38,Textiles,and was circulated tothe Member Bodies in June 1975. it has been approved by the Member Bodies of thefollowing countries : Belgium Ireland Spain Brazil Israel Sweden Canada Italy Switzerland Czechoslovakia Japan Thailand Denmark Netherlands Turkey France NewZealand United Kingdom Germany Poland U.S.S.R. Hungary Romania Yugoslavia India South Africa, Rep. of No Member Body expressed disapproval of the document. @ International Organization for Standardization, 1976 Printed in Switzeriand ISO3790-1976 (E) INTERNATIONALSTANDARD Fishing nets -- Determination of elongation of netting yarns 1SCOPEANDFIELDOFAPPLICATION 3.5 duration of testing : The time in seconds taken to reach half the knot breaking load, measured from the This International Standard specifies a method of deter- moment of application of the force,after application of miningthe elongationof netting yarns,from packages or pre-tension. from netting, in their final physical state. Tests may be carried out in both the dry and wet states but 3.6 pre-tension: The tension appied to straighten the tests in the wet state are considered to be particularly specimen (see 8.4). appropriate in indicating the behaviour of the yarn in use. 3.7 nominal gauge length: The length of specimen between the faces of the upper and lower grips of the testing machine,after application of pre-tension. 2 REFERENCES 4 PRINCIPLE Iso139,Textiles-Standardatmospheres forconditioning A prescribed length of netting yarn in the dry or wet state and testing. without knot is extended under increasing tensile load until ISO 858, Fishing nets -Designation of netting yarns in the that load reaches half the value of the corresponding dry or Tex system. wet knot breaking load. The test is performed using a suit- able apparatus that records the amount of elongation. iso1805,Fishing nets-Determination of breaking load and knot breaking load of netting yarns. 5 APPARATUS IS01806,Fishing nets-Determination of mesh breaking loadofnetting 5.1 Tensile testing machine. Either of the following types may be used : a) constant rate of elongation machine; 3 DEFINITIONS b)constantrateoftraversemachine. 3.1 knot breaking load : The breaking load, equal to the Preference should be given to a constant rate of elongation maximum load observed during a breaking test on netting machine, which shall always be used for arbitration pur- yarn with a weaver's knot. poses. Distinction is made between 5.1.1 The testing machine shall include a pair of flat grips the dry knot breaking load; to hold the specimen without slipping or damage, to ensure an accurate specimen length and to allow the application -. the wet knot breaking load. of a pre-tension (see the figure)