EN 20287:1994
(Main)Paper and board - Determination of moisture content - Oven-drying method (ISO 287:1985)
Paper and board - Determination of moisture content - Oven-drying method (ISO 287:1985)
Papier und Pappe - Bestimmung des Feuchtegehalts - Wärmeschrankverfahren (ISO 287:1985)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des Feuchtegehaltes von Papier und Pappe zur Zeit der Probenahme fest. Dieses Verfahren gilt für alle Papiere und Pappen einschliesslich Wellpappe und Vollpappe, vorausgesetzt, dass das Papier oder die Pappe keine flüchtigen Bestandteile ausser Wasser enthält, die bei der für die Prüfung vorgeschriebenen Trocknungstemperatur entweicht.
Papier et carton - Détermination de l'humidité - Méthode par séchage à l'étuve (ISO 287:1985)
Papir, karton in lepenka - Določevanje vlage - Metoda sušenja v peči (ISO 287:1985)
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Papier und Pappe - Bestimmung des Feuchtegehalts - Wärmeschrankverfahren (ISO 287:1985)Papier et carton - Détermination de l'humidité - Méthode par séchage a l'étuve (ISO 287:1985)Paper and board - Determination of moisture content - Oven-drying method (ISO 287:1985)85.060Papir, karton in lepenkaPaper and boardICS:Ta slovenski standard je istoveten z:EN 20287:1994SIST EN 20287:2000en01-april-2000SIST EN 20287:2000SLOVENSKI
STANDARD
SIST EN 20287:2000
SIST EN 20287:2000
SIST EN 20287:2000
International Standard . -287 INTERNATIONAL ORGANIZATION FOR STANDARDlZATION.MEWYHAPO~HAFl OPTAHW3AlWlR n0 CTAH&Af’Tl43ALWWORGANlSATlON INTERNATIONALE DE NORMALISATION Paper and board - Determination of moisture content - Oven-drying method Papier et carton - Determination de l’humidith - M&hode par skchage ;i K&we Second edition - 1985-08-15 UDC 676.2 : 543.812 Ref. No. IS0 2874985 (E) Descriptors : paper, paperboards, tests, determination of content, water, humidity. Price based on 4 pages SIST EN 20287:2000
Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies US0 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 287 was prepared by Technical Committee ISO/TC 6, Paper, board and pulps. IS0 287 was first published in 1978. This second edition cancels and replaces the first edition, of which it constitutes a minor revision. 0 International Organization for Standardization, 1985 Printed in Switzerland SIST EN 20287:2000
INTERNATIONAL STANDARD IS0 287-1985 (E) Paper and board - Determination of moisture content - Oven-drying method 1 Scope and field of application This International Standard specifies an oven-drying method for the determination of the moisture content of paper and board at the time of sampling. The method is applicable to all paper and board, including cor- rugated fibreboard and solid fibreboard, provided that the paper or board does not contain any substance, other than water, that will escape at the temperature specified for the test. 2 Reference IS0 186, Paper and board - Sampling to determine average quality. 1 ) 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 moisture content: The amount of water in a paper or board. In practice, it is regarded as the ratio of the loss of mass of a test piece when dried according to the standard method of test to its mass at the time of sampling; it is normally expressed as a percentage. 3.2 constant mass: The mass reached by a test piece of paper or board after drying at the specified temperature until the difference between two successive weighings does not exceed 0,l % of the initial mass of the test piece. 4 Principle Weighing of the test piece at the time of sampling, and again after drying to constant mass. 5 Apparatus 5.1 Balance, having an accuracy of 0,05 % of the mass to be weighed, or better. 5.2 Test piece containers, for the transport and weighing of test pieces, which shall be water-vapour proof and made in a light-weight construction from a material not subject to change under the conditions of test. 5.3 Oven, capable of maintaining the air temperature at 105 + 2 OC, and suitably ventilated to maintain uniform temperature in the usable volume whilst extracting the moisture driven off the paper. 6 Preparation of containers Before sampling, a sufficient number of clean, dry containers shall be numbered and allowed to attain temperature equilibrium with the atmosphere. Each container shall then be weighed and kept closed until the sample is about to be taken. 7 Sampling The units to be sampled shall be selected in accordance with IS0 186. NOTE - If the atmosphere at the place of sampling is warm and damp, precautions shall be taken in handling the paper or board to avoid con- tamination and any gain or loss of moisture. In particular, it is recom- mended that rubber gloves be worn ; to avoid moisture changes due to atmospheric exposure, it is important also to enclose all test pieces in their containers immediately after taking them. 1) At present at the stage of draft. (Revision of IS0 186-1977.) SIST EN 20287:2000
IS0 2874985 (El 8 Selection, preparation and weighing of test pieces For each unit withdrawn from the lot, proceed as specified in 8.1 or 8.2. 8.1 If the unit is a package that can be and may be unwrapped From the selected layer of sheets, cut four sets of strips of width 50 to 75 mm, one from each edge and two near the centre, taking care not to separate either the sheets or the strips comprising a set. Cut the strips with their longer dimen- sion in the cross-direction. I) Trim the ends of the strips to remove any paper or board within 150 mm of the edge of the original layer of sheets (see the figure). 8.1.1 When the unit is not subdivided (with or without a pallet) Dimensions in millimetres 8.1.1.1 Determination of the average value of moisture content in the lot 8.1.1.1 .l For paper or board of grammage less than or equal to 224 g/m2 Avoiding the three outermost sheets and all damaged sheets, take at least four consecutive sheets; quickly fold or cut them and enclose them together in one of the containers. The con- tents of a container constitute a test piece, which shall have a mass of at least 50 g. Weigh the container with its contents and calculate the mass of the test piece. Prepare duplicate test pieces for each unit sampled. NOTES 1 The number of layers discarded may need to be increased accord- ing to the efficiency of wrapping and influence of storage conditions. 2 Where, as in the instance of very light-weight papers, the bulk of a 50 g test piece would be very large, a smaller mass may be used but this fact should be stated in the test report. 8.1.1.1.2 For paper or board of grammage greater than 224 g/m2 Avoiding the outermost sheet and all damaged sheets, take one or more sheets to provide sufficient strips, of width 50 to 75 mm and length not less than 150 mm, to give a total mass of at least 50 g. The strips constitute the test piece. Immediately enclose the test piece in one of the containers. Weigh the con- tainer with its contents and calculate the mass of the test piece. Prepare duplicate test pieces for each unit sampled. 8.1.1.2 Determination of the variation in moisture content between the centre and edges of the sheets Select a layer of sheets in accordance with 8.1 .l .l .l or 8.1.1.1.2 and take sufficient consecutive sheets to give two test pieces each having a mass of at least 50 g and comprising strips cut as shown in the figure. (See the note.) Cross-dire&ion of paper Edge test strip Centre test strip I . I Edge test strip Figure - Positions of edge and centre test strips Discard the top and bottom strip from each set; combine the two sets representing the centre to form one test piece and the two from the edges to form another. Each test piece shall be of mass at least 50 g. Immediately place each test piece in a con- tainer. Weigh each container with its contents and calculate the mass of each test piece. Prepare duplicate test pieces for each unit and position sampled. NOTE - Where, as in the instance of very light-weight papers, the bulk of a 50 g test piece would be very large, a smaller mass may be used but this fact should be stated in the test report. 1) This direction of cut is chosen because any moisture variation across the width of the machine remaining in the paper fro
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