SIST EN 20535:2000
(Main)Paper and board - Determination of water absorptiveness - Cobb method (ISO 535:1991)
Paper and board - Determination of water absorptiveness - Cobb method (ISO 535:1991)
Papier und Pappe - Bestimmung des Wasserabsorptionsvermögens - Cobb-Verfahren (ISO 535:1991)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des Wasserabsoptionsvermögens von geleimten Papier und Pappe einschliesslich Wellpappe unter Standardbedingungen fest. Es ist möglicherweise nicht geeignet für Papier mit einem Flächengewicht von weniger als 50g/m2 oder geprägtes Papier. Es ist ungeeignet für poröses Papier wie Zeitungsdruckpapier oder ungeleimtes Papier wie Löschpapier oder andere Papiere mit einem relativ hohen Wasserabsorptionsvermögen, wofür sich ISO 8787 anbietet.
Papier et carton - Détermination de l'absorption d'eau - Méthode de Cobb (ISO 535:1991)
La présente Norme internationale prescrit une méthode pour la détermination de la quantité d'eau que peut absorber du papier collé ou du carton, y compris ondulé, dans des conditions normalisées. Elle peut ne pas convenir au papier de grammage inférieur à 50 g/m2 ou aux papiers gaufrés, et n'est applicable ni aux matériaux poreux tels que le papier journal, ni aux papiers non collés tels que le buvard ou d'autres papiers ayant un pouvoir absorbant relativement élevé, l'ISO 8787 étant mieux adaptée dans ce cas. La méthode prescrite n'est pas destinée à l'évaluation précise de l'aptitude du papier à l'écriture, bien qu'elle donne une indication générale de sa compatibilité avec des encres aqueuses.
Papir, karton in lepenka - Določevanje absorpcije vode - Cobbova metoda (ISO 535:1991)
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Papier und Pappe - Bestimmung des Wasserabsorptionsvermögens - Cobb-Verfahren (ISO 535:1991)Papier et carton - Détermination de l'absorption d'eau - Méthode de Cobb (ISO 535:1991)Paper and board - Determination of water absorptiveness - Cobb method (ISO 535:1991)85.060Papir, karton in lepenkaPaper and boardICS:Ta slovenski standard je istoveten z:EN 20535:1994SIST EN 20535:2000en01-april-2000SIST EN 20535:2000SLOVENSKI
STANDARDSIST ISO 535:19951DGRPHãþD
SIST EN 20535:2000
SIST EN 20535:2000
SIST EN 20535:2000
SIST EN 20535:2000
SIST EN 20535:2000
INTERNATIONAL STANDARD IS0 535 Second edition 1991-07-01 Paper and board - Determination of water absorptiveness - Cobb method Papier et carton -- Dfermination de /‘absorption d’eau - Mbthode de Cobb Reference number IS0 535: 199 1 (E) SIST EN 20535:2000
IS0 535:1991(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, govern- mental 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 Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 535 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps. This second edition cancels and replaces the first edition (IS0 535:1976), which has been technically revised. 0 IS0 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microftlm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN 20535:2000
IS0 535:1991(E) Introduction The test described in this International Standard permits the determi- nation of the quantity of water that can be absorbed by the surface of paper or board in a given time. Water absorptiveness is a function of various paper and board characteristics such as sizing, porosity, etc. . . . III SIST EN 20535:2000
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INTERNATIONAL STANDARD IS0 535:1991(E) Paper and board - Determination of water absorptiveness - Cobb method 1 Scope This International Standard specifies a method of determining the water absorptiveness of sized paper and board, including corrugated fibreboard, under standard conditions. It may not be suitable for paper of grammage less than 50 g/m2 or embossed paper. It is not suitable for porous papers such as newsprint or unsized papers such as blotting paper or other papers having a relatively high water ab- sorptiveness for which IS0 8787 is more suitable. This method is not intended to be used for precise evaluation of the writing properties of paper al- though it does give a general indication of suitability for use with aqueous inks. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 186:1985, Paper and board - Sampling to deter- mine average quality. IS0 187:1990, Paper, board and pulps - Standard atmosphere for conditioning and testing and proce- dure for monitoring the atmosphere and condifioning of samples. IS0 5269-l : 1979, Pulps - Preparation of laboratory sheets for physical testing - Part 1: Conventional sheet-former method. IS0 8787:1986, Paper and board - Determination of xapillary rise - Klemm method. 3 Definition For the purposes of this International Standard, the following definition applies. water absorptiveness (Cobb value): The calculated mass of water absorbed in a specified time by 1 m2 of paper or board under specified conditions. NOTE 1 The test area is normally 100 cm*. 4 Principle A test piece is weighed immediately before and im- mediately after exposure for a specified time of one surface to water, followed by blotting. The result of the increase in mass is expressed in grams per square metre (g/m2). 5 Reagents and materials 5.1 Water, distilled or deionized. NOTE 2 The temperature of the water is important and should be maintained during the test at the temperature used for conditioning and testing. 5.2 Blotting paper, having a grammage of 250 g/m2 + 25 g/m? - Pulp evaluation blotters are acceptable for the purposes of this International Standard (see IS0 5269-l). 6 Apparatus 6.1 Absorptiveness tester. For the determination of water absorptiveness, any type of apparatus may be used which permits -- an immediate and uniform contact of the water with the part of the test piece submitted to the test; 1 SIST EN 20535:2000
IS0 535:1991(E) - controlled rapid removal of the unabsorbed wa- ter from the test piece at the end of the contact period; and - the rapid removal of the test piece without the risk of co ntact with water outsi de the test are a. In its simplest form, the apparatus consists of a rigid base with a smooth, planar surface, and a rigid metal cylinder of 112,8 mm + 0,2 mm internal diam- eter (corresponding to a test area approximately 100 cm*) and with a means of clamping it firmly to the base plate. The edge of the cylinder in contact with the test piece shall be flat and machined smooth with a thickness sufficient to prevent the cy- linder cutting into the test piece. The height of the cylinder is not important provided it is sufficient to contain a water depth of 10 mm. NOTES 3 For materials where leakage between the cylinder and the upper surface of the test piece may occur during the test, a soft, elastic, non-absorbent gasket may be inter- posed to prevent this. This gasket should have the same internal diameter as the cylinder after clamping. 4 To prevent damage to the machined edge of the cy- linder caused by clamping it upside down it is advisable to mark the top in some way so that it can be identified readily. 5 If a cylinder of a small area is used
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