BS 6388-3-1996 Accelerated ageing of paper and board - Method for moist heat treatment at 80 C and 65% relative humidity《纸和纸板的加速老化 在80℃和65%相对湿度下湿热处理方法》.pdf
《BS 6388-3-1996 Accelerated ageing of paper and board - Method for moist heat treatment at 80 C and 65% relative humidity《纸和纸板的加速老化 在80℃和65%相对湿度下湿热处理方法》.pdf》由会员分享,可在线阅读,更多相关《BS 6388-3-1996 Accelerated ageing of paper and board - Method for moist heat treatment at 80 C and 65% relative humidity《纸和纸板的加速老化 在80℃和65%相对湿度下湿热处理方法》.pdf(12页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS 6388-3: 1996 ISO 5630-3: 1996 Accelerated ageing for paper and board Part 3: Method for moist heat treatment at 80 C and 65 % relative humidity ICS 85.060BS 6388-3:1996 This British Standard, having been prepared under the directionof the Sector Board forMaterials and Chemicals,
2、waspublished under the authorityof the Standards Boardand comes into effect on 15 October 1996 BSI 11-1998 First published August 1977 Second edition October 1996 The following BSI references relate to the work on this standard: Committee reference PAI/11 Draft for comment 94/342053 DC ISBN 0 580 26
3、412 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps, upon which the following bodies were represented: British Apparel and Textile Confederation British Carton Associat
4、ion British Fibreboard Packaging Association British Printing Industries Federation Envelope Makers and Manufacturing Stationers Association Her Majestys Stationery Office Ministry of Defence Paper Federation of Great Britain University of Manchester (Institute of Science and Technology) Amendments
5、issued since publication Amd. No. Date CommentsBS 6388-3:1996 BSI 11-1998 i Contents Page Committees responsible Inside front cover National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Principle 1 4 Apparatus 1 5 Sampling 1 6 Preparation of test specimens 2 7 Heat treatment 2 8 P
6、reconditioning and conditioning 2 9 Property testing 2 10 Expression of results 2 11 Test report 2 Annex A (informative) Apparatus for moist heat treatment 3 Annex B (informative) Bibliography 5 Figure A.1 Schematic diagram of moist heat treatment apparatus 3 Figure A.2 Typical apparatus for moist h
7、eat treatment 4 List of references Inside back coverBS 6388-3:1996 ii BSI 11-1998 National foreword This Part of BS 6388 has been prepared by Technical Committee PAI/11 and is identical to ISO 5630-3:1996 Paper and board Accelerated ageing Part3:Moisture heat treatment at 80 C and 65 % relative humi
8、dity, published by the International Organization for Standardization (ISO). It supersedes BS 6388-3:1987 which is withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Complianc
9、e with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard ISO 186:1994 BS EN ISO 186:1996 Paper and board Sampling to determine average quality (Identical) ISO 187:1990 BS EN 20187:1993 Paper, board an
10、d pulps. Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover and a back cover. This standa
11、rd has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS 6388-3:1996 BSI 11-1998 1 Introduction Exposure of paper or board to a hostile environment, such as some types of radiation, elevated temperatu
12、re, or chemical attack over a period of hours, may provide information concerning the natural changes that may occur in the material over a period of years. 1, 2 Hostile environments that have been used include dry heat, heat and moisture, visible and ultraviolet radiation, and sulfur dioxide gas. P
13、roperties compared before and after such exposure include mechanical, chemical and optical properties. It has been determined that the degradation of cellulose is very sensitive to moisture. 3, 4The rate of degradation increases about 25 % when the relative humidity increases from 60 % to 70 %. In o
14、rder to be representative of natural conditions in many countries where conditions of high humidity, and perhaps high temperature, are common, it is desirable that in an accelerated ageing atmosphere paper should have the same moisture content as in a natural ageing atmosphere. 5, 6For this reason,
15、after studying the ageing of many papers under different conditions of temperature and relative humidity, 80 C and 65 % relative humidity have been selected 5, 6for tests of accelerated ageing. 1 Scope This part of ISO 5630 specifies a procedure for moist heat treatment of paper or board and the gen
16、eral approach for testing properties of the heat-treated materials. This method is based on work on printing and writing papers, but may be used with discretion for other types of paper and board. The procedure is not recommended for papers such as resin-impregnated or varnish-treated papers, which
17、increase in physical strength on heating. The procedure is not applicable to certain electrical insulating papers, for which different conditions apply (see ISO 5630-4). This part of ISO 5630 does not specify the tests to bemade on the paper or board. It is left to the interested parties to determin
18、e which tests are appropriate for the type of paper or board being evaluated. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 5630. At the time of publication, the editions indicated were valid. All st
19、andards are subject to revision, and parties to agreements based on this part of ISO 5630 are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 186:19
20、94, Paper and board Sampling to determine average quality. ISO 187:1990, Paper, board and pulps Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples. 3 Principle Test specimens of paper or board are heated for a specified time at 80
21、 C and 65 % relative humidity. Agreed properties of the test specimens are compared before and after this moist heat treatment. 4 Apparatus 4.1 Ageing vessels, capable of being maintained at a temperature of (80 0,5) C and (65 2) % relative humidity. The temperature and relative humidity may be main
22、tained either by the use of climatized cabinets and automatic control of temperature and humidity or by the use of constant-temperature baths (see annex A). NOTE 1Graminski et al. 3, 4have shown that the rate of degradation of folding endurance and of zero-span tensile strength can be increased by c
23、hanging the relative humidity at elevated temperatures. Therefore, for maximum precision, the temperature should be closely controlled, to within 0,5 C or better, in order to hold the relative humidity variation to within2%. 4.2 Test equipment, relevant to the property tests agreed by the interested
24、 parties, complying with the relevant International Standard test method, if any, or with another appropriate standard test method. 4.3 Desiccator, or other preconditioner, maintained at 10 % to 35 % relative humidity. 5 Sampling When possible, sampling shall be carried out in accordance with ISO 18
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