Reinforcement yarns - Determination of twist (ISO 1890:1997)

This European Standard specifies a method for the determination of twist in continuous filaments yarns made with textile glass, carbon or aramid. This method is not applicable to products made form staple fibres. For yarns without twist or with twist less than 10 T/m modified equipment is to be used in order to obtain the required precision (see paragraph 5.1).

Verstärkungsgarne - Bestimmung der Drehungszahl (ISO 1890:1997)

Diese Internationale Norm legt ein Verfahren zur Bestimmung der Drehung von Textilgias-, Kohlenstoff- oder Aramidfilamentengarnen fest. Dieses Verfahren ist nicht auf Stapelfasergarne anwendbar. Für Garne ohne Drehung oder mit sehr  geringer Drehung darf ein modifiziertes Prüfgerät verwendet werden um eine ausreichende Genauigkeit zu erhalten.

Fils de renfort - Détermination de la torsion (ISO 1890:1997)

La présente norme européenne spécifie une méthode de détermination de la torsionde fils de renfort réalisés à l'aide de filaments de verre textile, de carbone ou d'aramide. Cette méthode n'est pas applicable aux fils réalisés à base de fibres discontinues (filés). Pour les fils sans torsion ou avec une torsion inférieure à 10 T/m, un équipement modifié est utilisé afin de conserver une précision suffisante (voir ] 5.1).

Preje za za ojačenje – Določevanje sučnosti (ISO 1890:1997)

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Verstärkungsgarne - Bestimmung der Drehungszahl (ISO 1890:1997)Fils de renfort - Détermination de la torsion (ISO 1890:1997)Reinforcement yarns - Determination of twist (ISO 1890:1997)59.100.01Materials for the reinforcement of composites in generalICS:Ta slovenski standard je istoveten z:EN ISO 1890:1997SIST EN ISO 1890:1999en01-maj-1999SIST EN ISO 1890:1999SLOVENSKI

SIST EN ISO 1890:1999

SIST EN ISO 1890:1999

SIST EN ISO 1890:1999

SIST EN ISO 1890:1999

SIST EN ISO 1890:1999

INTERNATIONAL STANDARD IS0 1890 Third edition 1997-05- 15 Reinforcement yarns - Determination of twist Fils de renfort 1 Dktermination de la torsion Reference number IS0 1890: 1997(E) SIST EN ISO 1890:1999

IS0 1890: 1997(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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, governmental and non- governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 1890 was prepared by Technical Committee ISORC 61, Plastics, Subcommittee SC 13, Composites and reinforcement fibres. This third edition cancels and replaces the second edition (IS0 1890:1986), which has been technically revised. 0 IS0 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Internet central @ x.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii SIST EN ISO 1890:1999

INTERNATIONAL STANDARD @ IS0 IS0 1890: 1997(E) Reinforcement yarns - Determination of twist 1 Scope This International Standard specifies a method for the determination of twist in yarns made from textile glass, carbon or aramid filaments. The method applies to single yarns (one twist) and to folded or cabled yarns (two or more twists). For folded and cabled yarns, the method is generally applied only to the final twist step. This International Standard is applicable to package-wound yarns. If the measurement is carried out on yarns taken from a beam (or warp) or from a fabric, the result is of an indicative nature only. The method is not applicable to products made from staple fibres. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 2:1973, Textiles - Designation of the direction of twist in yarns and related products. IS0 291: ---A Plastics - Standard atmospheres for conditioning and testing. , IS0 1889: 1997, Reinforcement yarns - Determination of linear density. 3 Definition For the purposes of this International Standard, the following definition applies. 3.1 Z twist or S twist: The twist in a product if, when it is held in a vertical position, the spirals or helices formed by the fibres or filaments around its axis incline in the same direction as the central portion of the letter Z or S, respectively. (See IS0 2:1973, clause 2). 1) To be published. (Revision of IS0 291:1977) 1 SIST EN ISO 1890:1999

IS0 1890:1997(E) @ IS0 4 Principle The twist in a specimen of known length is removed by untwisting, i.e. by turning one of the ends of with regard to the other, until all the elements (yarns, filaments) constituting the specimen are parallel. the specimen The direction of twist in the yarn is noted and the value of the twist is expressed eliminate the twist in 1 m of yarn. as the number of turns needed to The determination of the twist must allow for the fact that the take-off system may have an influence on the result. Thus when the yarn is taken off tangentially, the degree of twist inserted by the twist frame is not changed. On the other hand, if the yarn is taken off over-end, the measured twist is modified depending on the circumference of the bobbin. It will increase or decrease depending whether the yarn is taken off from alternate sides of the package. The method specified in this International Standard is based on the tangential take-off system. If required, the over-end twist can be either measured or an approximate value calculated using the following equation: T over-end = Ttangential k -IL 7cD where 1 - 7cD corresponds to the twist induced by over-end take-off; D is the diameter, in metres at the place on the bobbin where the specimen is taken. 5 Apparatus 5.1 Twist tester, i.e. an apparatus which has two clamps, one moving horizontally, the other rotating, mounted on a bar. The twist tester shall satisfy the following conditions: It shall be capable of measuring the number of turns to the nearest turn. - The clamps shall grip the yarn without slipping and shall not damage the yarn. - The tester shall include a device capable accuracy of +I mm. of measuring the l

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