7771 International Standard (ISO INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPrAHM3ALWA HO CTAHAAPTW3ALWWORGANISATION INTE RNATIONALE DE NORMALISATION Textiles - Determination of dimensional changes of fabrics induced by cold-water immersion Textiles - Determination des variations dimensionnelles des étoffes lors de leur immersion dans I'eau froide First edition -- 1985-02-15 UDC 677.017.635.2 Ref. No. 1SO 7771-1985 (E) (3) 986L-L/1 L Descriptors: textiles, fabrics, tests, immersion tests, dimensional stability tests. Price based on 4 pages ensefromIHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by International Standard ISO 7771 was prepared by Technical Committee ISO/TC 38, Textiles. International Organization for Standardization, 1985 ? Printed in Switzerland d without license from IHS Not for Resale ISO 7771-1985 (E) INTERNATIONAL STANDARD Textiles Determination of dimensional changes of fabrics induced by cold-water immersion Scope and field of application 5.3 Means of marking reference points on the specimen, as described in iso 3759. This International Standard specifies a method for determi- nation of the dimensional changes that occur when a fabric is 5.4 Plate glass, two pieces each measuring at least subjected to immersion in cold water without agitation, and 600 mm × 600 mm and approximately 6 mm thick. dried. It is applicable to fabrics which, in use, are subjected to cold water without agitation. 5.5 Means of producing and maintaining the standard atmosphere for testing textiles specified in clause 6. 2 References 5.6 Sodium hexametaphosphate or sodium triphosphate. Iso 139, Textiles - Standard atmospheres for conditioning and testing. Efficient wetting agent.1) 5.7 Iso 3759, Textiles -- Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change. Conditioning and testing atmospheres 6 Conditioning and testing shall be carried out according to 3 ISO 139. Definition For the purposes of this International Standard, the following definition applies. Test specimens dimensional change : The change in dimensions taking place 7.1 Number of specimens in either the lengthways or widthways direction when a specimen is soaked and dried without agitation under the Test at least one specimen taken from wide fabrics as specified prescribed conditions. in 7.2 and at least three specimens of narrow fabrics as specified in 7.3. 4 Principle 7.2 Specimens from wide fabrics The specimen is cut from the sample and, after conditioning, Cut each specimen at least 500 mm × 500 mm, free from is measured, soaked, dried under the prescribed conditions, creases, with the edges parallel to the lengthways and width- reconditioned and remeasured. The dimensional changes are ways directions respectively. Do not take any specimen within calculated in the lengthways and/or widthways directions. 1 m of either end of the piece and do not include selvedges. For knitted fabrics, make up the specimens in double thickness, the free edges being sewn together with dimensionally stable Apparatus and reagents thread. When fabrics with fancy weave structures are being tested, ensure as far as possible that exact numbers of repeats are taken in each test specimen. 5.1 Watertight tray or container, approximately 100 mm deep and of sufficient area to c